Dermatopontin (DPT): A Comprehensive Functional Annotation Report

1. Introduction and Overview

Dermatopontin (DPT), also known as tyrosine-rich acidic matrix protein (TRAMP), is a small non-collagenous extracellular matrix (ECM) protein encoded by the DPT gene in humans (UniProt: Q07507). The protein was first identified in 1993 by Cronshaw and colleagues at the University of Edinburgh, who isolated a 24 kDa protein that co-purified with lysyl oxidase from porcine skin [cronshaw-1993-discovery-abstract]. Sequence analysis revealed this protein was identical to a previously described bovine skin protein associated with dermatan sulfate proteoglycans. Due to its high tyrosine content and acidic nature (isoelectric point 4.1-4.4), the investigators proposed the name TRAMP (Tyrosine Rich Acidic Matrix Protein) [cronshaw-1993-discovery-abstract].

The mature protein has a molecular weight of approximately 22 kDa and is estimated to comprise approximately 12 mg/kg of wet dermis weight, making it a relatively abundant component of the dermal extracellular matrix [okamoto-2006-review-abstract]. In 1994, Forbes and colleagues demonstrated using polyclonal antiserum that TRAMP/dermatopontin has a widespread tissue distribution, including skin, skeletal muscle, heart, lung, kidney, cartilage, and bone [forbes-1994-tramp-abstract]. Their experiments with human skin fibroblast cultures showed that the protein incorporates both [³⁵S]sulfate and [³H]tyrosine before being secreted into the medium, providing early evidence for tyrosine sulfation as a key post-translational modification [forbes-1994-tramp-abstract].

The protein is composed of 183 amino acids, of which 20 are tyrosine residues, explaining its alternative designation as a "tyrosine-rich" matrix protein. A distinctive biochemical feature of DPT is that it undergoes tyrosine sulfation as a post-translational modification but is not glycosylated [jensen-2022-collagen-binding-abstract]. The presence of up to six sulfotyrosine residues has been confirmed in purified DPT variants, with the major circulating form containing four such modifications [jensen-2022-collagen-binding-abstract]. This sulfation pattern is functionally significant for collagen binding, as discussed below.

In vertebrates, the primary functions of dermatopontin encompass four major roles: serving as a structural component of the ECM through interaction with decorin and modification of collagen fibrillogenesis; mediating cell adhesion; modulating TGF-β activity; and regulating cellular quiescence and proliferation [okamoto-2006-review-abstract]. The protein is evolutionarily conserved, with homologues identified across mammals and several invertebrate species, including mollusks where dermatopontin has been co-opted for shell matrix formation [sarashina-2006-evolution-abstract].

2. Protein Structure and Domains

Dermatopontin belongs to the dermatopontin protein family (InterPro: IPR026645) and contains the characteristic DERM domain (Pfam: PF14704). The protein contains three disulfide-bonded loop structures that enclose conserved hexapeptide motifs, which are thought to be important for its structural integrity and function [kim-2019-myogenesis-abstract]. In molluscan homologues, a characteristic sequence motif (D-R-X-W/F/Y-X-F/Y/I/L/M-X1–2-C) has been identified that is repeated three times in the entire sequence [sarashina-2006-evolution-abstract].

Although the three-dimensional crystal structure of DPT has not been experimentally determined, computational modeling efforts have provided structural predictions. Kim and colleagues used threading-based automated protein modeling to generate a 3D structure, with the best model produced by SPARKS-X showing 87.4% of residues in the favored region of the Ramachandran plot [kim-2019-myogenesis-abstract]. This predicted structure has been deposited in the Protein Model Data Base (ID: PM0081951) [kim-2019-myogenesis-abstract].

The protein is acidic in nature, rich in tyrosine residues, and is secreted into the extracellular space following removal of a signal peptide during processing. A critical cell-adhesion active sequence, GQVVVAVR (an eight-amino acid peptide), has been identified within the protein and is essential for keratinocyte adhesion activity [okamoto-2010-keratinocyte-abstract].

3. Collagen Binding and Fibrillogenesis

One of the most well-characterized functions of dermatopontin is its role in collagen fibrillogenesis. DPT accelerates the formation of collagen fibrils and modifies the properties of newly formed fibrils, determining their size and arrangement within the extracellular matrix [takeda-2002-knockout-abstract]. This function has been demonstrated both through in vitro reconstitution experiments and through knockout mouse studies.

The molecular basis of DPT-collagen interaction was elucidated in a comprehensive 2022 study by Jensen and colleagues, who used Collagen Toolkit peptide arrays to map DPT binding sites on triple-helical collagens II and III [jensen-2022-collagen-binding-abstract]. They discovered that DPT binds preferentially to arginine-rich, positively-charged sequences on collagen that also contain hydrophobic residues. Critically, DPT-binding loci include the triple helix crosslinking sites and the collagenase cleavage site, suggesting that DPT may protect these functionally important regions [jensen-2022-collagen-binding-abstract].

The collagen-binding signature of DPT is remarkably similar to that of HSP47 (SERPINH1), the intracellular collagen-specific chaperone. Based on this finding, Jensen et al. proposed that DPT may assume the role of HSP47 as a collagen chaperone during and after secretion into the extracellular space [jensen-2022-collagen-binding-abstract]. Mutagenesis studies confirmed the importance of specific arginine residues: substituting any of the three arginine residues in the sequence GLAGQRGIVGLOGQRGER resulted in almost complete loss of DPT binding [jensen-2022-collagen-binding-abstract]. This observation has potential clinical significance, as missense mutations substituting corresponding arginine residues in collagens α-1(I) and α-1(II) are associated with connective tissue disorders including osteogenesis imperfecta and spondyloepiphyseal dysplasia [jensen-2022-collagen-binding-abstract].

The functional importance of DPT in collagen organization was definitively demonstrated through targeted gene disruption studies. Takeda and colleagues generated dermatopontin knockout mice and, although the animals showed no obvious anatomical abnormalities, their skin exhibited increased elasticity and reduced tensile strength [takeda-2002-knockout-abstract]. Electron microscopic analysis revealed that collagen fibrils in DPT-null mice displayed great variety in diameter and irregular contours, contrasting with the uniform fibrils seen in wild-type animals [takeda-2002-knockout-abstract]. Furthermore, skin collagen content was reduced by 40% in knockout mice compared to wild-type controls, and the relative thickness of the dermis was significantly decreased [takeda-2002-knockout-abstract]. These phenotypic features resemble aspects of Ehlers-Danlos syndrome, a group of connective tissue disorders characterized by abnormal collagen structure and function [okamoto-2006-review-abstract].

4. Role in Corneal Stromal Organization

The importance of dermatopontin in collagen organization extends beyond the skin to other tissues, notably the cornea. Cooper and colleagues investigated DPT function in corneal matrix organization using knockout mice and found significant structural abnormalities [cooper-2006-cornea-abstract].

Light microscopy demonstrated that DPT-deficient corneas showed a 24% reduction in average stromal thickness compared to wild-type animals (81.8 ± 21.5 μm versus 107.3 ± 21.2 μm; P < 0.001) [cooper-2006-cornea-abstract]. Transmission electron microscopy revealed significant disruption of fibril spacing within the posterior lamellae, characterized by less well-defined lamellae with little or no obvious banding compared to wild-type controls [cooper-2006-cornea-abstract]. Interestingly, the anterior and mid-stromal regions remained largely unaffected, suggesting regional specificity in DPT function within the cornea [cooper-2006-cornea-abstract].

The keratocytes (corneal fibroblasts) and epithelium appeared morphologically normal in knockout animals. Collagen fibrils displayed lower volume fractions and altered posterior organization but no changes in fibril diameter [cooper-2006-cornea-abstract]. The authors suggested that DPT may interact with corneal proteoglycans to maintain stromal architecture, particularly in the posterior region [cooper-2006-cornea-abstract]. These findings, combined with the high concentration of DPT in porcine corneal stroma (~0.02% by mass) [jensen-2022-collagen-binding-abstract], indicate an important role for this protein in corneal structure and potentially transparency.

5. Interaction with Fibronectin and ECM Assembly

Beyond its effects on collagen, dermatopontin plays important roles in the assembly of other ECM components, particularly fibronectin. Kato and colleagues demonstrated that DPT directly interacts with fibronectin and promotes the formation of fibronectin fibrils [kato-2011-fibronectin-abstract].

Using solid-phase binding assays and recombinant fibronectin domains, the study identified that DPT binds strongly to fibronectin type III repeats, particularly III13 and III14, with III1 serving as a potential cryptic binding site [kato-2011-fibronectin-abstract]. Mechanistically, DPT enhances the interaction between fibronectin's I1-5 domain and III12-14 repeats while partially disrupting the intramolecular interaction between III2-3 and III12-14. This disruption is significant because the III2-3 to III12-14 interaction is crucial for maintaining the compact conformation of native fibronectin; thus, DPT binding induces conformational changes that expose cryptic self-association sites and promote fibril formation [kato-2011-fibronectin-abstract].

Electron microscopy revealed that when incubated with DPT, fibronectin formed an insoluble complex of fibrils appearing as structures 50-200 nm in diameter with irregular, tortuous morphology [kato-2011-fibronectin-abstract]. Functionally, the ternary complex of DPT, fibronectin, and fibrin dramatically enhanced fibroblast adhesion (approximately 10-fold) compared to fibrin-fibronectin complexes alone, and this adhesion was mediated through α5β1 integrin receptors [kato-2011-fibronectin-abstract]. These findings position DPT as an important regulator of provisional matrix assembly during tissue repair.

6. Cell Adhesion Mechanisms

Dermatopontin mediates cell adhesion through interactions with cell surface receptors, primarily integrins. This function links communication between the cell surface of fibroblasts and other cell types with their surrounding ECM environment [okamoto-2010-keratinocyte-abstract].

Studies using human epidermal keratinocytes (HaCaT cells) demonstrated that these cells spread on dermatopontin substrates and form organized actin stress fibers [okamoto-2010-keratinocyte-abstract]. The adhesion mechanism involves two receptor systems: the α3β1 integrin and heparan sulfate proteoglycan-type receptors, likely syndecans [okamoto-2010-keratinocyte-abstract]. This dual receptor system was confirmed by experiments showing that adhesion was inhibited by both EDTA (disrupting integrin function) and heparin (competing with proteoglycan binding) [okamoto-2010-keratinocyte-abstract].

The α3β1 integrin receptor is particularly important for DPT-mediated cellular responses. In cardiac fibroblasts, integrin α3β1 was identified as at least one receptor mediating adhesion, spreading, and migration responses to DPT [liu-2013-cardiac-abstract]. The significance of this interaction extends to endothelial cells, where exogenously supplied DPT modulates the expression of both TGF-β1 and integrin α3β1, proteins with crucial roles in endothelial cell behavior during angiogenesis [liu-2013-cardiac-abstract].

7. Modulation of TGF-β Signaling

One of the most functionally significant aspects of dermatopontin biology is its ability to modulate transforming growth factor-β (TGF-β) signaling. This was first characterized by Okamoto and colleagues, who demonstrated that DPT interacts with both decorin and TGF-β1 to enhance TGF-β biological activity [okamoto-1999-tgfb-abstract].

Using solid-phase binding assays, the study found that dermatopontin binds decorin with an apparent dissociation constant (Kd) of 100 nM [okamoto-1999-tgfb-abstract]. Importantly, dermatopontin inhibits the formation of the decorin-TGF-β1 complex, and decorin reciprocally competes with dermatopontin for TGF-β1 binding [okamoto-1999-tgfb-abstract]. However, when both proteins are present together, the dermatopontin-decorin complex binds 3-fold more TGF-β1 than either component individually [okamoto-1999-tgfb-abstract]. This suggests a complex regulatory mechanism where the stoichiometry of these interactions determines local TGF-β availability.

Functional studies using mink lung epithelial cells transfected with a plasminogen activator inhibitor (PAI-1) promoter-luciferase construct confirmed the biological significance of these interactions. Dermatopontin augmented TGF-β1-induced luciferase expression, demonstrating enhanced TGF-β biological activity [okamoto-1999-tgfb-abstract]. While dermatopontin alone showed only weak inhibitory effects on cell proliferation, it significantly enhanced the growth-inhibitory activity of TGF-β on these cells [okamoto-1999-tgfb-abstract]. The authors concluded that dermatopontin modifies the behavior of TGF-β through interaction with decorin in the microenvironment of the extracellular matrix, effectively increasing cellular responsiveness to this cytokine [okamoto-1999-tgfb-abstract].

8. Cellular Localization and Tissue Distribution

Dermatopontin is an extensively distributed component of the extracellular matrix. The original tissue distribution studies by Forbes et al. using polyclonal antiserum demonstrated widespread expression including skin, skeletal muscle, heart, lung, kidney, cartilage, and bone [forbes-1994-tramp-abstract]. In the skin, DPT is located predominantly on the surface of collagen fibers and is particularly abundant in the dermis [okamoto-2006-review-abstract].

The subcellular localization of DPT is extracellular, consistent with its function as a secreted ECM component. Following translation and removal of the signal peptide, the protein is secreted and becomes associated with collagen fibers and other ECM components. In the skin, DPT distributes throughout the dermal layer and participates in the structural organization of the collagenous matrix [takeda-2002-knockout-abstract]. In the cornea, DPT is present at relatively high concentrations (~0.02% by mass) in the stromal ECM [jensen-2022-collagen-binding-abstract].

Expression patterns vary under pathological conditions. Notably, fibroblasts from patients with systemic sclerosis and hypertrophic scars show significantly reduced DPT expression compared to normal skin fibroblasts [kuroda-1999-fibrosis-abstract]. This reduced expression appears to be functionally significant for fibrosis pathogenesis. In vitro studies demonstrated that TGF-β1 increases DPT mRNA and protein levels, while interleukin-4 reduces expression [kuroda-1999-fibrosis-abstract]. Interestingly, type I collagen substrate suppresses DPT expression, with more pronounced reduction observed in three-dimensional collagen matrices [kuroda-1999-fibrosis-abstract].

9. Role in Wound Healing and Tissue Repair

The cell adhesion and ECM assembly functions of dermatopontin position it as an important player in wound healing. During normal wound repair, DPT promotes cell adhesion to fibrin fibers of the provisional matrix in a dose-dependent manner and facilitates fibrillation of both collagen and fibronectin [krishnaswamy-2014-wounds-abstract].

Re-epithelialization

A critical aspect of DPT function in wound healing is its role in re-epithelialization, the process by which keratinocytes migrate to cover the wound surface. Krishnaswamy and Korrapati demonstrated that DPT promotes keratinocyte migration in a dose-dependent fashion but, importantly, does not stimulate keratinocyte proliferation [krishnaswamy-2014-reepithelialization-abstract]. This separation of migratory and proliferative effects suggests that DPT functions specifically to facilitate cell movement rather than cell division during the re-epithelialization process.

Molecular analysis revealed a striking pattern of tissue-specific expression: DPT shows negligible expression in the epidermis but demonstrates prominent presence in the dermis [krishnaswamy-2014-reepithelialization-abstract]. This distribution indicates that DPT facilitates wound healing through paracrine mechanisms, with dermal-derived DPT acting on epidermal keratinocytes from below to enhance their migratory capacity [krishnaswamy-2014-reepithelialization-abstract]. This paracrine mode of action positions DPT as a key mediator of dermal-epidermal communication during tissue repair.

Cardiac Repair

Evidence for DPT's role in tissue repair comes from studies of myocardial infarction. Following experimentally induced myocardial infarction in rats, dermatopontin mRNA expression increased progressively in the infarct zone, with levels rising to 2.4-fold by day 7, 4.1-fold by day 14, and 4.2-fold by day 28 compared to pre-ligation hearts [takemoto-2002-infarct-abstract]. In situ hybridization localized the expression to macrophages and mesenchymal cells within the infarct zone, and the temporal pattern paralleled that of decorin and type I collagen, suggesting coordinated participation in ECM reformation [takemoto-2002-infarct-abstract].

In the heart, DPT promotes adhesion, spreading, and migration of cardiac fibroblasts, and these effects are mediated through integrin α3β1 [liu-2013-cardiac-abstract]. Hypoxia and serum deprivation, conditions mimicking the ischemic environment of infarcted tissue, stimulate DPT expression and secretion from cardiac cells [liu-2013-cardiac-abstract]. These findings suggest that DPT may represent a therapeutic target for modulating ventricular remodeling following myocardial infarction.

In contrast to normal wound healing, chronic cutaneous wounds show a paradoxical pattern: despite elevated DPT mRNA levels, protein levels are markedly reduced in both wound tissue and wound exudates [krishnaswamy-2014-wounds-abstract]. This discrepancy is explained by protease-mediated degradation; the elevated proteolytic environment characteristic of chronic wounds leads to DPT destruction, contributing to impaired healing [krishnaswamy-2014-wounds-abstract]. During normal healing, a balance exists between pro-migration dermatopontin and anti-migration decorin, with mutual regulation of their activities [krishnaswamy-2014-wounds-abstract].

DPT also possesses pro-angiogenic properties, enhancing endothelial cell motility, inducing lamellipodia formation, and stimulating tube formation on matrigel substrates [liu-2013-cardiac-abstract]. Additionally, DPT accelerates fibrin fibril formation and the resulting fibrin fibrils with DPT enhance endothelial cell attachment, spreading, and cytoskeletal organization [kato-2011-fibronectin-abstract].

10. Role in Myogenesis and Muscle Regeneration

Recent work has expanded our understanding of DPT function to include skeletal muscle biology. Kim and colleagues demonstrated that DPT actively regulates muscle development through three mechanisms: enhancing cell adhesion, reducing cell proliferation, and promoting myoblast differentiation [kim-2019-myogenesis-abstract].

In the context of skeletal muscle ECM, DPT works synergistically with fibromodulin (FMOD) to promote myogenesis, with the two proteins positively regulating each other [kim-2019-myogenesis-abstract]. In contrast, DPT and fibronectin exhibit opposing effects on myoblast behavior [kim-2019-myogenesis-abstract]. During muscle regeneration following injury, DPT expression increases during differentiation phases, confirming its essential role in muscle recovery processes [kim-2019-myogenesis-abstract].

11. Role in Adipose Tissue and Obesity

Recent research has identified dermatopontin as a novel adipokine with important roles in adipose tissue biology and obesity-associated complications. Unamuno and colleagues demonstrated that obesity and obesity-associated type 2 diabetes are accompanied by increased circulating levels of DPT, with elevated gene expression in visceral adipose tissue (VAT) of obese patients [unamuno-2020-adipokine-abstract].

In human visceral adipocytes, DPT expression is dynamically regulated by inflammatory signals. Pro-inflammatory stimuli including lipopolysaccharide (LPS), TGF-β, and palmitic acid enhance DPT gene expression, while anti-inflammatory cytokines IL-4 and IL-13 produce downregulation [unamuno-2020-adipokine-abstract]. This regulatory pattern suggests DPT expression is integrated into adipose tissue inflammatory responses.

Functionally, DPT promotes both ECM remodeling and inflammation in adipocytes. Treatment with DPT increased expression of ECM-related genes including COL6A3 (collagen VI), ELN (elastin), MMP9 (matrix metalloproteinase 9), and TNMD (tenomodulin), as well as inflammation-related factors IL6, IL8, and TNF [unamuno-2020-adipokine-abstract]. These findings indicate that DPT contributes to the structural and inflammatory changes characteristic of dysfunctional adipose tissue in obesity, providing a mechanistic link between ECM remodeling and metabolic dysfunction.

12. Evolutionary Conservation

Dermatopontin is evolutionarily conserved across metazoans, with homologues identified in mammals, other vertebrates, and invertebrates. The evolutionary history of dermatopontin in mollusks has been particularly well studied, revealing interesting patterns of functional diversification.

Sarashina and colleagues identified 14 molluscan dermatopontin homologues from eight snail species belonging to the orders Basommatophora (pond snails) and Stylommatophora (land snails) [sarashina-2006-evolution-abstract]. A major shell matrix protein originally obtained from a freshwater snail was identified as a molluscan homologue of dermatopontin. In the basommatophoran lineage, three dermatopontin types were identified: one appears to function as a shell matrix protein involved in biomineralization, while the others have more general ECM functions based on gene expression analyses [sarashina-2006-evolution-abstract].

Significantly, the study revealed that potential N-glycosylation sites were found exclusively in the dermatopontin variants associated with shell calcification, suggesting this modification may be important for biomineralization function [sarashina-2006-evolution-abstract]. In the two gastropod lineages examined, recruitment of dermatopontin to the shell matrix occurred at least twice independently following lineage divergence, indicating convergent evolution of this function [sarashina-2006-evolution-abstract].

In the pearl oyster Pinctada martensii, DPT mRNA is constitutively expressed in all studied tissues with the most abundant expression in the mantle, which is the tissue responsible for nacre (mother-of-pearl) formation. These findings suggest that dermatopontin has been repeatedly co-opted for roles in biomineralization in invertebrates, while retaining its ancestral ECM functions in vertebrates.

13. Disease Associations and Clinical Relevance

Reduced dermatopontin expression has been associated with several pathological conditions. In fibrotic diseases including systemic sclerosis and hypertrophic scarring, fibroblasts show decreased DPT expression, which may contribute to aberrant collagen deposition and tissue architecture [kuroda-1999-fibrosis-abstract].

The knockout mouse phenotype, resembling Ehlers-Danlos syndrome with increased skin elasticity, reduced tensile strength, and abnormal collagen fibril morphology, suggests that DPT deficiency or dysfunction could contribute to connective tissue disorders in humans [takeda-2002-knockout-abstract]. The discovery that DPT binds to specific arginine-containing sequences on collagen that are mutated in osteogenesis imperfecta and spondyloepiphyseal dysplasia further supports a potential role for disrupted DPT-collagen interactions in skeletal connective tissue diseases [jensen-2022-collagen-binding-abstract].

Cancer Associations

Downregulation of DPT has been observed in several cancers, and accumulating evidence suggests DPT may function as a tumor suppressor. The most detailed mechanistic study was conducted by Fu and colleagues in hepatocellular carcinoma (HCC) [fu-2014-hcc-abstract]. They demonstrated that DPT was significantly downregulated in 202 HCC clinical samples, and its expression level was closely correlated with indicators of tumor metastasis (such as vascular invasion and tumor thrombosis) and patient prognosis [fu-2014-hcc-abstract].

The silencing of DPT in HCC was shown to occur through epigenetic mechanisms, specifically DNA methylation of the DPT promoter region [fu-2014-hcc-abstract]. Functionally, overexpression of DPT dramatically suppressed HCC cell migration in vitro and intrahepatic metastasis in vivo. The inhibitory effects of DPT on HCC cell motility were associated with dysregulated focal adhesion assembly, decreased RhoA activity, and reduced phosphorylation of focal adhesion kinase (FAK) and Src tyrosine kinase. These alterations required α3β1 integrin signaling [fu-2014-hcc-abstract].

The authors proposed that DPT serves as a novel prognostic marker and metastasis suppressor in HCC, and suggested that demethylating agents to restore DPT expression may have therapeutic potential [fu-2014-hcc-abstract]. DPT downregulation has also been reported in other cancers including uterine leiomyomas, with studies suggesting DPT can inhibit various tumor-related signaling pathways including Wnt/β-catenin, TGF-β, Hippo/YAP, and ERK/MAPK pathways.

Cholangiocarcinoma and Tumor Immune Microenvironment

More recent work has extended the understanding of DPT's tumor suppressor function to cholangiocarcinoma (CHOL) and has revealed an important role in modulating the tumor immune microenvironment. Xu and colleagues demonstrated that CHOL patients with low DPT expression have significantly poorer prognosis [xu-2024-cholangiocarcinoma-abstract]. Enrichment analysis showed a positive correlation between DPT expression levels and infiltration of immune cells and immunomodulatory factors [xu-2024-cholangiocarcinoma-abstract].

Mechanistically, the study revealed that DPT downregulation in cholangiocarcinoma cells suppresses the secretion of CCL19, a chemokine crucial for immune cell recruitment, by macrophages [xu-2024-cholangiocarcinoma-abstract]. CCL19 normally functions to attract T cells and dendritic cells to tumor sites. This finding suggests that DPT may enhance anti-tumor immunity by promoting macrophage secretion of immune-recruiting chemokines, thereby increasing immune cell infiltration into the tumor microenvironment.

Importantly, enhanced DPT levels were correlated with improved responses to anti-PD-1/PD-L1 immunotherapy in cholangiocarcinoma, suggesting that DPT expression status may serve as a biomarker for immunotherapy responsiveness [xu-2024-cholangiocarcinoma-abstract]. These findings expand the tumor suppressor function of DPT beyond direct effects on cancer cell migration to include modulation of the tumor immune microenvironment.

14. Open Questions

Several important questions about dermatopontin biology remain to be addressed:

1. Structural basis of function: While computational models of DPT structure exist, experimental determination of the three-dimensional structure by X-ray crystallography or cryo-EM would provide crucial insights into the molecular basis of its diverse interactions with collagen, fibronectin, decorin, and TGF-β.

2. Role of tyrosine sulfation: Although DPT is tyrosine-sulfated, the precise contribution of this modification to collagen binding and other functions remains incompletely understood. Studies using desulfated or sulfation-site mutant DPT would clarify this.

3. Therapeutic potential: Given DPT's roles in wound healing, cardiac remodeling, and tumor suppression, could recombinant DPT or DPT-derived peptides be developed as therapeutics for chronic wounds, cardiac fibrosis, or cancer?

4. Regulation of expression: What are the complete transcriptional and post-transcriptional mechanisms controlling DPT expression in different tissues and under various physiological and pathological conditions?

5. Human genetic variants: Are there common or rare variants in the human DPT gene associated with connective tissue disorders, wound healing abnormalities, or other phenotypes?

6. Interaction network: The full spectrum of DPT binding partners in the ECM and on cell surfaces remains to be comprehensively defined using unbiased proteomic approaches.

7. Regional specificity in cornea: Why is DPT function most critical for the posterior stroma of the cornea? What proteoglycans or other factors are involved?

8. Evolutionary questions: What drove the independent recruitment of dermatopontin to shell matrix function in multiple mollusk lineages, and how do N-glycosylation modifications enable this new function?

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18. unamuno-2020-adipokine: Unamuno X, Gómez-Ambrosi J, Ramírez B, Rodríguez A, Becerril S, Valentí V, Moncada R, Silva C, Salvador J, Frühbeck G, Catalán V. Dermatopontin, A Novel Adipokine Promoting Adipose Tissue Extracellular Matrix Remodelling and Inflammation in Obesity. Journal of Clinical Medicine. 2020;9(4):1069. DOI: 10.3390/jcm9041069. PMCID: PMC7230369. PMID: 32283761.

19. xu-2024-cholangiocarcinoma: Xu P, Li S, Liu K, Fan R, Liu F, Zhang H, Liu D, Shen D. Downregulation of dermatopontin in cholangiocarcinoma cells suppresses CCL19 secretion of macrophages and immune infiltration. Journal of Cancer Research and Clinical Oncology. 2024;150(2):66. DOI: 10.1007/s00432-023-05532-1. PMCID: PMC10834663. PMID: 38300311.

Citations

1. cooper-2006-cornea-abstract.md
2. cronshaw-1993-discovery-abstract.md
3. forbes-1994-tramp-abstract.md
4. fu-2014-hcc-abstract.md
5. jensen-2022-collagen-binding-abstract.md
6. kato-2011-fibronectin-abstract.md
7. kim-2019-myogenesis-abstract.md
8. krishnaswamy-2014-reepithelialization-abstract.md
9. krishnaswamy-2014-wounds-abstract.md
10. kuroda-1999-fibrosis-abstract.md
11. liu-2013-cardiac-abstract.md
12. okamoto-1999-tgfb-abstract.md
13. okamoto-2006-review-abstract.md
14. okamoto-2010-keratinocyte-abstract.md
15. sarashina-2006-evolution-abstract.md
16. takeda-2002-knockout-abstract.md
17. takemoto-2002-infarct-abstract.md
18. unamuno-2020-adipokine-abstract.md
19. xu-2024-cholangiocarcinoma-abstract.md

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Plan overview: We verified identity and nomenclature (human DPT encodes dermatopontin, a secreted extracellular matrix glycoprotein) and collected recent mechanistic and translational literature prioritizing 2023–2024 sources. We synthesized key concepts, recent developments, applications, expert perspectives, and quantitative findings, and created a concise artifact summarizing major points with citations and URLs.

Comprehensive research report: DPT (Dermatopontin; gene DPT; UniProt Q07507) in human

1) Key concepts and definitions with current understanding
- Identity and basic properties: Dermatopontin (DPT) is a secreted, tyrosine‑rich acidic extracellular matrix (ECM) glycoprotein (historically called TRAMP). It is highly expressed in the dermis and by dermal fibroblasts, while expression in the epidermis and keratinocyte lines is negligible, consistent with a paracrine dermis-to-epidermis role (URL: https://doi.org/10.1038/srep07385, Dec 2014) (krishnaswamy2014roleofdermatopontin pages 1-2, krishnaswamy2014roleofdermatopontin pages 3-4).
- Core ECM mechanisms: DPT promotes matrix assembly by accelerating collagen and fibronectin fibrillogenesis and functionally interacting with decorin and TGF‑β, linking it to growth-factor bioactivity and ECM organization. Loss of DPT disrupts collagen microfibril organization and yields Ehlers–Danlos–like connective-tissue phenotypes in mice, underscoring its structural role (URL: https://doi.org/10.3390/biom14080900, Jul 2024) (yan2024alterationsofmatrisome pages 8-10, yan2024alterationsofmatrisome pages 10-11).
- Cell-adhesion interface: DPT enhances adhesion and migration via integrin α3β1 engagement in keratinocytes and fibroblasts, supporting cell–matrix interactions during re‑epithelialization (URL: https://doi.org/10.1038/srep07385, Dec 2014) (krishnaswamy2014roleofdermatopontin pages 1-2, krishnaswamy2014roleofdermatopontin pages 2-3).

2) Recent developments and latest research (emphasis 2023–2024)
- Fibroblast–macrophage niche in skin: 2024 work shows Dpt+ fibroblasts constitute a dominant fibroblast population (>80% of fibroblasts express Dpt) and are a key source of CSF1 that sustains dermal macrophage subsets. Depleting Dpt+ fibroblasts or deleting Csf1 in these fibroblasts causes marked loss of CD206hi CD64+ macrophages and delayed wound healing, implicating DPT-marked fibroblasts in a CSF1–CSF1R axis essential for skin immune homeostasis and repair (URL: https://doi.org/10.1101/2024.11.21.624708, Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4, vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10, vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27).
- Skin aging/photoaging: In vivo profiling (2024) demonstrates significant reduction of DPT mRNA in naturally aged human skin and in photoexposed conditions, consistent with global matrisome decline and altered matrix transcripts with aging (URL: https://doi.org/10.3390/biom14080900, Jul 2024) (yan2024alterationsofmatrisome pages 8-10).
- Cancer signaling and tumor suppression: In breast cancer, DPT is downregulated; restoring DPT directly binds YAP, increases YAP Ser127 phosphorylation, limits YAP nuclear accumulation, and suppresses migration, invasion, and tumor growth in vivo, identifying a DPT–YAP axis with therapeutic implications (URL: https://doi.org/10.1038/s41419-023-05657-8, Feb 2023) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8).
- Immune modulation in cholangiocarcinoma: Low DPT associates with poorer prognosis and less immune infiltration; DPT secreted from tumor cells elevates macrophage CCL19 secretion in co‑culture, potentially enhancing immune cell recruitment and improving response to PD‑1/PD‑L1 therapy (URL: https://doi.org/10.1007/s00432-023-05532-1, Feb 2024) (xu2024downregulationofdermatopontin pages 15-19).
- Osteoarthritis biomarker discovery: Multi‑cohort bioinformatics and RT‑PCR validation (2024) identify DPT as consistently upregulated in osteoarthritis and correlated with immune-cell infiltration, nominating DPT as a candidate biomarker for OA progression (URL: https://doi.org/10.1186/s12891-024-07758-7, Aug 2024) (sun2024identificationofhtra1 pages 12-12).

3) Current applications and real-world implementations
- Wound repair: Recombinant DPT enhances keratinocyte migration and lamellipodia formation without stimulating proliferation, supporting its potential as a bioactive matrix component for improving re‑epithelialization in skin repair strategies (URL: https://doi.org/10.1038/srep07385, Dec 2014) (krishnaswamy2014roleofdermatopontin pages 2-3, krishnaswamy2014roleofdermatopontin pages 1-2).
- ECM and fibrosis targeting: The skin Dpt+ fibroblast–CSF1–macrophage axis suggests new strategies to modulate CSF1 provision by fibroblasts to influence macrophage niches in fibrotic skin diseases (e.g., systemic sclerosis), offering an alternative to systemic CSF1R blockade that has tolerability concerns (URL: https://doi.org/10.1101/2024.11.21.624708, Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27, vollmers2024dermatopontinexpressingfibroblastsmediate pages 4-7).
- Cancer biomarkers/therapeutics: In breast cancer, DPT’s suppression of YAP activity suggests biomarker and therapeutic angles for Hippo pathway‑driven tumors; in cholangiocarcinoma, DPT levels correlate with immune infiltration and predicted response to PD‑1/PD‑L1 therapy, supporting its development as a prognostic/theranostic marker (URLs: https://doi.org/10.1038/s41419-023-05657-8; https://doi.org/10.1007/s00432-023-05532-1) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8, xu2024downregulationofdermatopontin pages 15-19).
- Degenerative joint disease: DPT’s consistent upregulation and immune correlations in OA datasets position it for further translational validation as a diagnostic/prognostic biomarker (URL: https://doi.org/10.1186/s12891-024-07758-7) (sun2024identificationofhtra1 pages 12-12).

4) Expert opinions and analysis from authoritative sources
- ECM organizational role: Reviews and in vivo skin studies emphasize DPT as a “novel player” in ECM biology that interacts with decorin and affects collagen fibrillogenesis; human skin aging work highlights decreased DPT transcripts with age and photoexposure, consistent with expert consensus that matrisome decline contributes to structural and functional skin aging (URL: https://doi.org/10.3390/biom14080900, 2024) (yan2024alterationsofmatrisome pages 10-11, yan2024alterationsofmatrisome pages 8-10).
- Fibroblast ecology and immune niches: The 2024 skin study provides a coherent framework linking Dpt+ fibroblast identity to macrophage maintenance via CSF1, integrating fibroblast heterogeneity, ECM programs, and immunoregulatory circuits that impact wound healing and fibrotic disease—an emerging expert view of fibroblast–immune crosstalk in tissue homeostasis (URL: https://doi.org/10.1101/2024.11.21.624708, 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10, vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27, vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4).
- Cancer pathway integration: The DPT–YAP mechanistic connection in 2023 underscores the role of ECM glycoproteins as upstream regulators of Hippo signaling, aligning with expert perspectives that mechanical/ECM cues tune YAP/TAZ activity in tumor progression (URL: https://doi.org/10.1038/s41419-023-05657-8, 2023) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8).

5) Relevant statistics and data from recent studies
- Dpt+ fibroblast prevalence in skin: >80% of skin fibroblasts show robust Dpt expression by single‑cell/CITE‑seq (URL: https://doi.org/10.1101/2024.11.21.624708, Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4).
- Macrophage niche dependency: Genetic depletion of Dpt+ fibroblasts or Csf1 deletion in Dpt+ fibroblasts induces a marked reduction of CD206hi CD64+ macrophages across dermis, dWAT, and adventitia, and delays intermediate/late wound closure (qualitatively significant; detailed counts shown in the study figures) (URL: https://doi.org/10.1101/2024.11.21.624708, Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4, vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10, vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27).
- Keratinocyte migration potency: Recombinant DPT promoted keratinocyte migration in scratch assays at 50–500 pg/mL with statistically significant effects (e.g., P = 0.0258 for an indicated concentration/time comparison) and did not increase keratinocyte proliferation up to 100 ng/mL for 72 h (URL: https://doi.org/10.1038/srep07385, Dec 2014) (krishnaswamy2014roleofdermatopontin pages 2-3, krishnaswamy2014roleofdermatopontin pages 1-2).
- Breast cancer cohort and signaling statistics: In a 100 paired‑tissue breast cancer cohort, DPT was “drastically downregulated”; pathway enrichment implicated Hippo signaling (P < 0.01). In vitro/in vivo, DPT overexpression decreased tumor volumes and weights and increased YAP Ser127 phosphorylation, with consistent statistical support in the study (URL: https://doi.org/10.1038/s41419-023-05657-8, Feb 2023) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8).
- Osteoarthritis datasets: Multi‑cohort analyses identified DPT as consistently increased in OA training/validation cohorts, with correlation to immune infiltration and RT‑PCR confirmation (URL: https://doi.org/10.1186/s12891-024-07758-7, Aug 2024) (sun2024identificationofhtra1 pages 12-12).
- Aging/photoaging skin: Quantitative RT‑PCR in human skin showed significant reductions in DPT mRNA in aged compared with young skin, and photoexposure alters matrisome transcripts (URL: https://doi.org/10.3390/biom14080900, Jul 2024) (yan2024alterationsofmatrisome pages 8-10).

6) Functional and mechanistic model
- Molecular functions and partners: DPT modulates ECM assembly (collagen/fibronectin fibrillogenesis), binds decorin and influences TGF‑β activity, and promotes cell adhesion/migration via integrin α3β1 in skin cells, directly linking ECM structure to cell motility. In cancer, DPT physically interacts with YAP to restrain Hippo signaling activity, aligning ECM cues with oncogenic transcriptional control (URLs: https://doi.org/10.3390/biom14080900; https://doi.org/10.1038/srep07385; https://doi.org/10.1038/s41419-023-05657-8) (yan2024alterationsofmatrisome pages 8-10, krishnaswamy2014roleofdermatopontin pages 1-2, ye2023dnmt3adermatopontinaxissuppresses pages 4-8).
- Tissue localization and context: DPT acts predominantly in the extracellular space of dermis and other connective tissues; Dpt+ fibroblasts organize immune niches via CSF1 provision to macrophages, affecting tissue remodeling and repair (URL: https://doi.org/10.1101/2024.11.21.624708) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4, vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10).

7) Disease links and translational perspectives
- Fibrotic skin disease and wound healing: The Dpt+ fibroblast–CSF1 axis connects fibroblast identity, macrophage maintenance, and wound healing; fibroblast‑derived CSF1 correlates with macrophage abundance and disease severity in systemic sclerosis skin, highlighting a targetable stromal–immune pathway (URL: https://doi.org/10.1101/2024.11.21.624708) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 4-7, vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27).
- Cancer: In breast cancer, DPT downregulation and DPT–YAP antagonism support DPT as a tumor suppressor and potential biomarker; in cholangiocarcinoma, DPT is positively associated with immune infiltration and may predict better response to PD‑1/PD‑L1 blockade; both support future clinical exploration (URLs: https://doi.org/10.1038/s41419-023-05657-8; https://doi.org/10.1007/s00432-023-05532-1) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8, xu2024downregulationofdermatopontin pages 15-19).
- Osteoarthritis and aging: DPT increase in OA and decline in aged skin suggest bidirectional associations with pathological ECM remodeling, with potential use in monitoring disease progression or therapeutic impact in joint and skin biology (URLs: https://doi.org/10.1186/s12891-024-07758-7; https://doi.org/10.3390/biom14080900) (sun2024identificationofhtra1 pages 12-12, yan2024alterationsofmatrisome pages 8-10).

Embedded summary artifact
| Aspect | Key finding (1–2 sentences) | Model/system | Quantitative notes | Source (with DOI URL and year) |
|---|---|---:|---:|---|
| Identity / alias | Dermatopontin (DPT; also called TRAMP) is a secreted, tyrosine-rich acidic extracellular matrix glycoprotein belonging to the dermatopontin family with a DERM domain. | Human protein annotation / biochemical characterization | 22 kDa TRAMP; secreted via N-terminal signal peptide (reported in human studies). | https://doi.org/10.1038/srep07385 (2014) (pqac-000012) |
| Dermal localization / epidermal low expression | DPT is highly expressed in dermis and dermal fibroblasts and is negligible/low in epidermis and keratinocyte lines, consistent with a paracrine dermis→epidermis role. | Human skin tissue, HaCaT keratinocytes | Dermal enrichment by WB/IHC; epidermal expression ~negligible in assays. | https://doi.org/10.1038/srep07385 (2014) (pqac-000013) |
| Collagen / fibronectin fibrillogenesis & decorin / TGF-β interactions | DPT accelerates collagen and fibronectin fibrillogenesis and interacts functionally with decorin and TGF-β to modulate matrix assembly and growth factor activity. | In vitro fibrillogenesis, mouse KO phenotypes | DPT deficiency alters collagen microfibril organization (KO yields Ehlers–Danlos-like phenotype). | https://doi.org/10.3390/biom14080900 (2024) (pqac-000011) |
| Integrin α3β1-mediated adhesion / migration | DPT promotes cell adhesion and engages integrin α3β1 to support adhesion and migration, though other receptors may also contribute. | Cell adhesion assays (keratinocytes, fibroblasts) | Functional integrin engagement reported in adhesion assays. | https://doi.org/10.1038/srep07385 (2014) (pqac-000012) |
| Keratinocyte migration / re-epithelialization | Recombinant DPT promotes keratinocyte migration and lamellipodia formation, supporting re-epithelialization via a paracrine dermal cue. | HaCaT scratch assays / microscopy | Effective at 50–500 pg/mL in wound assays; reported significance (e.g., P = 0.0258 for indicated concentration). | https://doi.org/10.1038/srep07385 (2014) (pqac-000004) |
| Dpt+ fibroblasts supply CSF1 to macrophages | A dominant Dpt+ fibroblast population in skin is a primary source of CSF1 and sustains specific tissue macrophage subsets via CSF1–CSF1R signaling. | Mouse genetic lineage tracing, CITE-seq, conditional knockouts | >80% of skin fibroblasts show robust Dpt expression; ligand–receptor analysis ranks CSF1–CSF1R among top interactions. | https://doi.org/10.1101/2024.11.21.624708 (Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4) |
| Wound healing impact upon fibroblast-derived CSF1 loss | Conditional deletion of Csf1 in Dpt+ fibroblasts causes profound loss of CD206hi CD64+ macrophages and produces delayed wound healing and ECM/structural changes. | Mouse conditional Csf1 deletion in Dpt+ fibroblasts; wound models | Marked reduction of CD206hiCD64+ macrophages and significant delay in intermediate/late wound closure (reported qualitatively). | https://doi.org/10.1101/2024.11.21.624708 (Nov 2024) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27) |
| Aging / photoaging: reduced DPT mRNA | DPT mRNA/protein is significantly reduced in naturally aged and photoaged human skin, consistent with matrisome decline with age/exposure. | Human in vivo skin samples (young vs aged; sun-protected vs exposed) | Reported significant reduction in aged skin mRNA levels (qualitative in study). | https://doi.org/10.3390/biom14080900 (Jul 2024) (yan2024alterationsofmatrisome pages 8-10) |
| Breast cancer: DPT downregulated, binds YAP, suppresses malignancy | DPT is downregulated in breast cancer; DPT physically interacts with YAP, increases YAP Ser127 phosphorylation, restricts YAP nuclear localization and suppresses tumor growth, migration and invasion. | Cell lines (BT549, MDA-MB-231), xenograft models, patient cohort | Clinical validation: cohort n = 100 paired BC tissues; pathway enrichment in Hippo signaling (P < 0.01); DPT overexpression reduced tumor volume/weight in vivo (significant). | https://doi.org/10.1038/s41419-023-05657-8 (Feb 2023) (ye2023dnmt3adermatopontinaxissuppresses pages 4-8) |
| Cholangiocarcinoma: low DPT, immune infiltration & macrophage CCL19 | Low DPT expression in cholangiocarcinoma associates with poorer prognosis and lower immune infiltration; tumor/extracellular DPT can stimulate macrophages to secrete CCL19, linking DPT to immune modulation. | Human CHOL tissues/cell lines; co-culture and ELISA assays | Lentiviral DPT overexpression increased macrophage CCL19 secretion (measured by ELISA); correlation with improved PD-1/PD-L1 response predicted. | https://doi.org/10.1007/s00432-023-05532-1 (Feb 2024) (xu2024downregulationofdermatopontin pages 15-19) |
| Osteoarthritis biomarker identification | DPT was identified among candidate biomarkers upregulated in osteoarthritis and correlated with immune cell infiltration in OA datasets. | Human OA transcriptomic cohorts (GEO meta-analysis) and RT‑PCR validation | DPT consistently ↑ in OA training/validation cohorts (diagnostic potential reported in study analyses). | https://doi.org/10.1186/s12891-024-07758-7 (Aug 2024) (sun2024identificationofhtra1 pages 12-12) |

Table: Concise summary table of human dermatopontin (DPT) functions, localization, mechanisms, and key 2014–2024 findings with primary-source DOIs and contextual citations from gathered evidence.

Limitations and open questions
- Preclinical skin fibroblast–macrophage studies are from a 2024 preprint; while mechanistically compelling, peer‑reviewed confirmation and human functional validation will strengthen translational claims (URL: https://doi.org/10.1101/2024.11.21.624708) (vollmers2024dermatopontinexpressingfibroblastsmediate pages 4-7, vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4).
- Quantitative diagnostic metrics (e.g., AUCs) for DPT in OA and cancers require additional prospective validation beyond current retrospective and in silico studies (sun2024identificationofhtra1 pages 12-12, ye2023dnmt3adermatopontinaxissuppresses pages 4-8, xu2024downregulationofdermatopontin pages 15-19).

Conclusion
Human DPT encodes a secreted ECM glycoprotein that organizes collagen/fibronectin assembly and modulates growth‑factor and integrin signaling, enabling keratinocyte migration and re‑epithelialization. Recent work highlights Dpt+ fibroblasts as central organizers of a CSF1‑dependent macrophage niche essential for skin homeostasis and repair and links DPT to cancer immunity and YAP signaling. These findings nominate DPT as a mechanistic node across ECM biology, immune microenvironments, tissue repair, fibrosis, and cancer, with promising biomarker and therapeutic implications requiring continued clinical validation (yan2024alterationsofmatrisome pages 8-10, krishnaswamy2014roleofdermatopontin pages 1-2, krishnaswamy2014roleofdermatopontin pages 2-3, vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4, vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10, ye2023dnmt3adermatopontinaxissuppresses pages 4-8, xu2024downregulationofdermatopontin pages 15-19, sun2024identificationofhtra1 pages 12-12).

References

1. (krishnaswamy2014roleofdermatopontin pages 1-2): Venkat Raghavan Krishnaswamy and Purna Sai Korrapati. Role of dermatopontin in re-epithelialization: implications on keratinocyte migration and proliferation. Scientific Reports, Dec 2014. URL: https://doi.org/10.1038/srep07385, doi:10.1038/srep07385. This article has 59 citations and is from a peer-reviewed journal.

2. (krishnaswamy2014roleofdermatopontin pages 3-4): Venkat Raghavan Krishnaswamy and Purna Sai Korrapati. Role of dermatopontin in re-epithelialization: implications on keratinocyte migration and proliferation. Scientific Reports, Dec 2014. URL: https://doi.org/10.1038/srep07385, doi:10.1038/srep07385. This article has 59 citations and is from a peer-reviewed journal.

3. (yan2024alterationsofmatrisome pages 8-10): Yan Yan, Hehui Quan, Chunfang Guo, Zhaoping Qin, and Taihao Quan. Alterations of matrisome gene expression in naturally aged and photoaged human skin in vivo. Biomolecules, 14:900, Jul 2024. URL: https://doi.org/10.3390/biom14080900, doi:10.3390/biom14080900. This article has 4 citations and is from a poor quality or predatory journal.

4. (yan2024alterationsofmatrisome pages 10-11): Yan Yan, Hehui Quan, Chunfang Guo, Zhaoping Qin, and Taihao Quan. Alterations of matrisome gene expression in naturally aged and photoaged human skin in vivo. Biomolecules, 14:900, Jul 2024. URL: https://doi.org/10.3390/biom14080900, doi:10.3390/biom14080900. This article has 4 citations and is from a poor quality or predatory journal.

5. (krishnaswamy2014roleofdermatopontin pages 2-3): Venkat Raghavan Krishnaswamy and Purna Sai Korrapati. Role of dermatopontin in re-epithelialization: implications on keratinocyte migration and proliferation. Scientific Reports, Dec 2014. URL: https://doi.org/10.1038/srep07385, doi:10.1038/srep07385. This article has 59 citations and is from a peer-reviewed journal.

6. (vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4): Apple Cortez Vollmers, Sunny Z. Wu, Anthony Altieri, Erika E. McCartney, Hannah Bender, Wyne P. Lee, Juan Zhang, Crystal Hu, Salil Uttarwar, Jason A. Vander Heiden, Christopher Davidson, Yein Chung, Willie Ortiz, Michael Long, Raymond Asuncion, Yeqing Angela Yang, Jean X. Jiang, Zora Modrusan, Akshay T. Krishnamurty, Wenxian Fu, Sören Müller, Matthew B. Buechler, and Shannon J. Turley. Dermatopontin-expressing fibroblasts mediate an essential skin macrophage niche. bioRxiv, Nov 2024. URL: https://doi.org/10.1101/2024.11.21.624708, doi:10.1101/2024.11.21.624708. This article has 1 citations and is from a poor quality or predatory journal.

7. (vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10): Apple Cortez Vollmers, Sunny Z. Wu, Anthony Altieri, Erika E. McCartney, Hannah Bender, Wyne P. Lee, Juan Zhang, Crystal Hu, Salil Uttarwar, Jason A. Vander Heiden, Christopher Davidson, Yein Chung, Willie Ortiz, Michael Long, Raymond Asuncion, Yeqing Angela Yang, Jean X. Jiang, Zora Modrusan, Akshay T. Krishnamurty, Wenxian Fu, Sören Müller, Matthew B. Buechler, and Shannon J. Turley. Dermatopontin-expressing fibroblasts mediate an essential skin macrophage niche. bioRxiv, Nov 2024. URL: https://doi.org/10.1101/2024.11.21.624708, doi:10.1101/2024.11.21.624708. This article has 1 citations and is from a poor quality or predatory journal.

8. (vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27): Apple Cortez Vollmers, Sunny Z. Wu, Anthony Altieri, Erika E. McCartney, Hannah Bender, Wyne P. Lee, Juan Zhang, Crystal Hu, Salil Uttarwar, Jason A. Vander Heiden, Christopher Davidson, Yein Chung, Willie Ortiz, Michael Long, Raymond Asuncion, Yeqing Angela Yang, Jean X. Jiang, Zora Modrusan, Akshay T. Krishnamurty, Wenxian Fu, Sören Müller, Matthew B. Buechler, and Shannon J. Turley. Dermatopontin-expressing fibroblasts mediate an essential skin macrophage niche. bioRxiv, Nov 2024. URL: https://doi.org/10.1101/2024.11.21.624708, doi:10.1101/2024.11.21.624708. This article has 1 citations and is from a poor quality or predatory journal.

9. (ye2023dnmt3adermatopontinaxissuppresses pages 4-8): Dan-rong Ye, Yuying Wang, Xiaochong Deng, Xiqian Zhou, Diya Liu, Baian Zhou, Wenfang Zheng, Xuehui Wang, and Lin Fang. Dnmt3a-dermatopontin axis suppresses breast cancer malignancy via inactivating yap. Cell Death & Disease, Feb 2023. URL: https://doi.org/10.1038/s41419-023-05657-8, doi:10.1038/s41419-023-05657-8. This article has 20 citations and is from a peer-reviewed journal.

10. (xu2024downregulationofdermatopontin pages 15-19): Peng Xu, Siyang Li, Ke Liu, Rui Fan, Fahui Liu, Hao-Xuan Zhang, Donghua Liu, and Dongyan Shen. Downregulation of dermatopontin in cholangiocarcinoma cells suppresses ccl19 secretion of macrophages and immune infiltration. Journal of Cancer Research and Clinical Oncology, Feb 2024. URL: https://doi.org/10.1007/s00432-023-05532-1, doi:10.1007/s00432-023-05532-1. This article has 7 citations and is from a peer-reviewed journal.

11. (sun2024identificationofhtra1 pages 12-12): Yunchao Sun, Hui Yang, Jiaquan Guo, Jian Du, Shoujiang Han, and Xinming Yang. Identification of htra1, dpt and mxra5 as potential biomarkers associated with osteoarthritis progression and immune infiltration. BMC Musculoskeletal Disorders, Aug 2024. URL: https://doi.org/10.1186/s12891-024-07758-7, doi:10.1186/s12891-024-07758-7. This article has 9 citations and is from a peer-reviewed journal.

12. (vollmers2024dermatopontinexpressingfibroblastsmediate pages 4-7): Apple Cortez Vollmers, Sunny Z. Wu, Anthony Altieri, Erika E. McCartney, Hannah Bender, Wyne P. Lee, Juan Zhang, Crystal Hu, Salil Uttarwar, Jason A. Vander Heiden, Christopher Davidson, Yein Chung, Willie Ortiz, Michael Long, Raymond Asuncion, Yeqing Angela Yang, Jean X. Jiang, Zora Modrusan, Akshay T. Krishnamurty, Wenxian Fu, Sören Müller, Matthew B. Buechler, and Shannon J. Turley. Dermatopontin-expressing fibroblasts mediate an essential skin macrophage niche. bioRxiv, Nov 2024. URL: https://doi.org/10.1101/2024.11.21.624708, doi:10.1101/2024.11.21.624708. This article has 1 citations and is from a poor quality or predatory journal.

Citations

1. yan2024alterationsofmatrisome pages 8-10
2. xu2024downregulationofdermatopontin pages 15-19
3. vollmers2024dermatopontinexpressingfibroblastsmediate pages 1-4
4. vollmers2024dermatopontinexpressingfibroblastsmediate pages 24-27
5. krishnaswamy2014roleofdermatopontin pages 1-2
6. krishnaswamy2014roleofdermatopontin pages 3-4
7. yan2024alterationsofmatrisome pages 10-11
8. krishnaswamy2014roleofdermatopontin pages 2-3
9. vollmers2024dermatopontinexpressingfibroblastsmediate pages 7-10
10. vollmers2024dermatopontinexpressingfibroblastsmediate pages 4-7
11. https://doi.org/10.1038/srep07385,
12. https://doi.org/10.3390/biom14080900,
13. https://doi.org/10.1101/2024.11.21.624708,
14. https://doi.org/10.1038/s41419-023-05657-8,
15. https://doi.org/10.1007/s00432-023-05532-1,
16. https://doi.org/10.1186/s12891-024-07758-7,
17. https://doi.org/10.1038/s41419-023-05657-8;
18. https://doi.org/10.1007/s00432-023-05532-1
19. https://doi.org/10.1186/s12891-024-07758-7
20. https://doi.org/10.3390/biom14080900;
21. https://doi.org/10.1038/srep07385;
22. https://doi.org/10.1038/s41419-023-05657-8
23. https://doi.org/10.1101/2024.11.21.624708
24. https://doi.org/10.1186/s12891-024-07758-7;
25. https://doi.org/10.3390/biom14080900
26. https://doi.org/10.1038/srep07385

Gene Research for Functional Annotation: DPT (Dermatopontin)

Introduction and Key Concepts

Dermatopontin (DPT) is a protein-coding gene (UniProt Q07507) that encodes the dermatopontin protein, also known as tyrosine-rich acidic matrix protein (TRAMP). Dermatopontin is a small (~200-amino-acid) extracellular matrix (ECM) protein that is highly conserved across species (pubmed.ncbi.nlm.nih.gov). In humans, the DPT gene is located on chromosome 1q24 and primarily expressed by fibroblasts and related connective tissue cells. The protein is secreted and localized to the ECM – for example, in skin dermis it is found on the surface of collagen fibrils (pubmed.ncbi.nlm.nih.gov). Dermatopontin is characterized by an abundance of tyrosine residues (many of which are post-translationally sulfated) and an overall acidic composition (pubmed.ncbi.nlm.nih.gov). It belongs to the dermatopontin family (of which it is the principal member in mammals) and contains a single conserved DERM domain (PF14704) responsible for its ECM interactions. Notably, dermatopontin is not an enzyme or receptor, but a matricellular protein – a class of ECM proteins that modulate cell–matrix interactions and signaling without forming structural fibers (pubmed.ncbi.nlm.nih.gov). Early studies and database annotations posited that DPT “mediates adhesion by cell surface integrin binding” and serves as a link between fibroblasts and their extracellular environment (www.proteinatlas.org). It has also been “postulated to modify the behavior of TGF-β” (Transforming Growth Factor-beta) through interactions with other matrix components (www.proteinatlas.org). In summary, DPT is defined as an ECM-associated regulator protein that influences cell adhesion, matrix assembly, and growth factor signaling.

Structure and Localization

The dermatopontin protein is translated as a precursor with an N-terminal signal peptide, directing it to the secretory pathway (consistent with its detection in secretory vesicles (www.proteinatlas.org)). The mature protein (~185 amino acids) is released to the extracellular space, where it becomes incorporated into the matrix. Dermatopontin lacks large glycosaminoglycan chains (it is not a proteoglycan itself), but its many tyrosines can be sulfated – up to six sulfate groups have been observed on bovine corneal dermatopontin (pubmed.ncbi.nlm.nih.gov). This high degree of tyrosine sulfation gives the protein a highly negative charge, which is functionally significant for binding positively charged sites on other proteins (such as collagen, discussed below). Dermatopontin does not form fibrils on its own; instead, it exists as a soluble or matrix-bound globular protein. Its structure has been challenging to solve experimentally (no X-ray or NMR structure was reported as of 2023), but in silico modeling suggests a beta-sheet-rich fold (pmc.ncbi.nlm.nih.gov). Functionally, dermatopontin may form protein–protein interfaces via specific motifs: a notable example is a conserved adhesion motif (sequence GQVVVAVR in bovine DPT) that mediates cell binding (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). In terms of tissue distribution, DPT is ubiquitously present in connective tissues. It is predicted to be secreted to the extracellular matrix, with experimental evidence localizing it at sites like the dermal collagen network and the stromal interface of organs (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). The Human Protein Atlas indicates DPT is enriched in fibroblast-rich locations and is indeed found in the extracellular matrix of tissues such as skin, tendon, and the adventitia of vessels (www.proteinatlas.org) (www.proteinatlas.org). Intracellularly, DPT is observed in the vesicular compartment of fibroblasts (consistent with secretion) (www.proteinatlas.org), and a portion can transiently reside on the cell surface. Overall, DPT’s structure and localization enable it to function as an interface molecule between cells and the structural matrix.

Expression Profile and Tissue Distribution

DPT gene expression is broadly detected in human tissues, with highest levels in those rich in connective tissue. RNA profiling (NCBI and GTEx data) shows strong expression in adipose tissue (fat) with RPKM ~270, and high levels in heart, skin, and lung among others (www.ncbi.nlm.nih.gov). Dermatopontin is expressed in both fetal and adult tissues; one study noted it is “strongly expressed in human fetal and adult liver, kidney, and spleen” while weaker in heart and ovary (pubmed.ncbi.nlm.nih.gov). Single-cell RNA data indicate DPT is particularly enriched in fibroblasts and related mesenchymal cells – for example, it is group-enriched in dermal fibroblasts, testicular Leydig cells, and peritubular cells (www.proteinatlas.org). In line with this, tissues like skin dermis, intestinal submucosa, and smooth muscle stroma show high DPT levels (HPA classifies DPT as “tissue enhanced” in intestine and smooth muscle) (www.proteinatlas.org). Notably, immune cells do not express DPT (www.proteinatlas.org), and it is low in parenchymal cells like hepatocytes or neurons, underscoring that DPT is a product of the stromal compartment.

At the protein level, dermatopontin is a component of the extracellular matrix across various organs. It has been detected in wound fluid and blood plasma at low concentrations, especially during tissue injury. For instance, dermatopontin is present in the fibrin clot and wound exudate in early wound healing, at higher concentration than in normal serum (pmc.ncbi.nlm.nih.gov). In the cornea (a collagen-rich tissue), DPT is fairly abundant – about 0.02% of corneal stromal protein by mass (pubmed.ncbi.nlm.nih.gov) – reflecting its role in corneal matrix organization. Changes in DPT expression are observed in disease states: dermatopontin levels often decrease in fibrotic or scarred tissues. Fibroblasts cultured from hypertrophic scars and from systemic sclerosis (scleroderma) lesions show significantly reduced DPT mRNA and protein compared to normal skin fibroblasts (pubmed.ncbi.nlm.nih.gov). In hypertrophic scar tissue, DPT was lower in lesion areas than in patient-matched normal skin (pubmed.ncbi.nlm.nih.gov). This downregulation likely results from the altered cytokine milieu; indeed, DPT expression in fibroblasts can be regulated by factors like TGF-β1 and IL-4 (both prominent in fibrosis) as well as by the abundance of collagen matrix (pubmed.ncbi.nlm.nih.gov). In cancer, a somewhat analogous pattern is seen: loss of DPT expression has been noted in tumor stroma. For example, in hepatocellular carcinoma (HCC), DPT mRNA is normally high in liver fibroblasts but was found to be significantly downregulated in HCC tumors, with the protein weakly expressed in cancerous regions compared to surrounding tissue (pubmed.ncbi.nlm.nih.gov). HCC areas with active TGF-β signaling showed low DPT, suggesting tumors may suppress DPT to modify their matrix environment (pubmed.ncbi.nlm.nih.gov). On the other hand, certain pathological conditions show increased DPT expression as part of tissue remodeling. A striking example is obesity: in adipose tissue of obese individuals, DPT expression is elevated (discussed further below) (pubmed.ncbi.nlm.nih.gov). Likewise, in osteoarthritic cartilage, DPT is upregulated relative to healthy cartilage, reflecting ongoing ECM remodeling in osteoarthritis (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In summary, DPT is broadly expressed in the body’s connective tissues under homeostatic conditions, and its levels can fluctuate in response to tissue remodeling, injury, or disease – generally decreasing in some fibrotic and cancerous contexts, while increasing in others like degenerative cartilage or inflamed adipose tissue.

Biological Function and Mechanisms

Dermatopontin plays a multifaceted role in the extracellular matrix, impacting both the structural assembly of the matrix and the behavior of cells interacting with the matrix. Key functions and mechanisms include:

• Cell Adhesion Mediator: One of dermatopontin’s earliest identified functions was to promote cell adhesion. It was initially purified from dermal extracts as a cell-binding protein. DPT binds to cell surface integrins and other receptors, effectively gluing cells to the ECM (www.proteinatlas.org). For example, studies with human keratinocyte cells (HaCaT) showed that these cells adhere strongly to a DPT-coated surface, spreading and forming actin stress fibers (pubmed.ncbi.nlm.nih.gov). This adhesion was inhibited by EDTA (implicating integrins, which require divalent cations) and by heparin (pubmed.ncbi.nlm.nih.gov). Further analysis revealed two parallel binding interactions: (1) DPT engages α3β1 integrin on the cell membrane, and (2) DPT binds to a heparan sulfate proteoglycan receptor on the cell (most likely a syndecan) (pubmed.ncbi.nlm.nih.gov). Notably, a synthetic DPT peptide (“DP-4”, corresponding to residues 33–43 of bovine dermatopontin) could block cell adhesion to DPT and, when immobilized, this peptide itself promoted cell adhesion in a dose-dependent manner (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). The core active sequence (GQVVVAVR) within this peptide was pinpointed as critical for binding (pubmed.ncbi.nlm.nih.gov). The DP-4 peptide’s activity was abolished by heparitinase (which cleaves heparan sulfate chains on syndecans), confirming that dermatopontin’s adhesive function involves binding to syndecan proteoglycans on the cell surface (pubmed.ncbi.nlm.nih.gov). In summary, DPT acts as a bridging molecule: one part of DPT binds integrins and another part binds syndecan (heparan sulfate), bringing the cell into firm contact with the ECM. Through this dual mechanism, dermatopontin serves as a multifunctional adhesion molecule for epidermal and dermal cells (pubmed.ncbi.nlm.nih.gov).

• Collagen Fibrillogenesis and Matrix Assembly: Dermatopontin is deeply involved in organizing collagen fibers, a fundamental component of connective tissues. It binds to fibrillar collagens (such as type I, II, III) at specific sites and influences fibril formation. According to UniProt annotations and experimental evidence, DPT “accelerates collagen fibril formation, and stabilizes collagen fibrils against low-temperature dissociation” (www.proteinatlas.org). Recent biochemical research has illuminated how DPT interacts with collagen. In 2022, Chakravarti and colleagues purified dermatopontin from corneal tissue and mapped its binding on collagen using peptide toolkits (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). They discovered that DPT preferentially binds collagen at arginine-rich sequences in the triple helix – notably, regions involved in collagen cross-linking and the site where collagenase enzymes cleave collagen (pubmed.ncbi.nlm.nih.gov). The binding motif recognized by DPT (an arginine- and hydrophobic-rich sequence) is strikingly similar to the motif recognized by the collagen chaperone HSP47 (pubmed.ncbi.nlm.nih.gov). This suggests dermatopontin may function like an extracellular collagen chaperone, stabilizing or arranging collagen molecules once they are secreted (pubmed.ncbi.nlm.nih.gov). Indeed, the authors propose DPT “assumes the role of HSP47 after secretion” in guiding proper fibril assembly (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). The functional consequence is that DPT can facilitate the timely formation of collagen fibrils and enhance their tensile stability. Supporting this, targeted deletion of DPT in mice resulted in a phenotype similar to Ehlers-Danlos syndrome (a collagen disorder): the mice had abnormally elastic, fragile skin due to disorganized collagen fibrils (pubmed.ncbi.nlm.nih.gov). This in vivo outcome underscores that DPT is required for normal collagen architecture. Furthermore, DPT’s binding to collagen may have implications in disease: the same study noted that certain collagen genetic mutations (arginine substitutions in collagens I and II) which cause osteogenesis imperfecta and other dysplasias occur at the sites that abolish DPT binding (pubmed.ncbi.nlm.nih.gov). It is speculated that loss of DPT–collagen interaction in those mutants contributes to the connective tissue pathology (pubmed.ncbi.nlm.nih.gov). In summary, dermatopontin helps orchestrate collagen assembly in the ECM, ensuring fibers form correctly and interact properly with other matrix components.

• Interaction with Fibronectin and Provisional Matrix Formation: Besides collagens, dermatopontin interacts with fibronectin, another key ECM glycoprotein. Fibronectin exists in a soluble form in plasma and in an insoluble fibrillar form in the ECM; the conversion requires fibronectin unfolding and fibril assembly. A 2011 Journal of Biological Chemistry study by Kato et al. demonstrated that DPT can bind fibronectin and promote fibronectin fibril formation (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In wound healing models, DPT was found to colocalize with fibrin and fibronectin in the clot, indicating it is present in the provisional matrix of early wounds (pmc.ncbi.nlm.nih.gov). There, DPT markedly enhanced cell adhesion to a fibrin–fibronectin matrix: both normal human fibroblasts and HT1080 cells (fibrosarcoma cells) showed significantly increased attachment when DPT was added (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This adhesion was mediated primarily by α5β1 integrin, the main fibronectin-binding integrin on cells (pmc.ncbi.nlm.nih.gov). Mechanistically, DPT alters fibronectin’s conformation. It was shown to bind to specific fibronectin type III domains (particularly III_13 and III_14 domains) (pmc.ncbi.nlm.nih.gov). By doing so, DPT inhibited interactions that keep fibronectin in a compact, inactive form and enhanced interactions that lead to fibronectin unfolding and fibril assembly (pmc.ncbi.nlm.nih.gov). In essence, dermatopontin acts as a co-factor that triggers fibronectin to polymerize into fibrils (pmc.ncbi.nlm.nih.gov). Electron microscopy confirmed that mixing fibronectin with DPT leads to robust fibronectin fibril networks, whereas fibronectin alone remains more soluble (pmc.ncbi.nlm.nih.gov). This activity has important functional consequences: in the presence of DPT, cells adhering to the fibronectin matrix had more organized cytoskeletons and presumably stronger adhesion, which is beneficial for the stability of a healing wound (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Thus, DPT accelerates the formation of a mature ECM from the initial fibrin/fibronectin-rich clot, effectively bridging early wound matrix to a stable scar. This explains why DPT is heavily present in wound fluid – it’s part of the molecular toolkit for wound repair. Taken together, by promoting collagen and fibronectin assembly, dermatopontin plays a central role in ECM organization and in creating a microenvironment that supports tissue integrity.

• Modulation of Growth Factor Signaling (TGF-β1): Dermatopontin has a significant biochemical interaction with the cytokine Transforming Growth Factor-beta 1 (TGF-β1), a master regulator of fibrosis and cell growth. However, DPT does not bind TGF-β1 directly with high affinity – instead, it interacts with decorin, a small leucine-rich proteoglycan that is a known TGF-β binder. In a seminal 1999 study, Yamaguchi et al. found that DPT and decorin form a complex: “Dermatopontin reacted with decorin with an apparent Kd of 100 nM” (pmc.ncbi.nlm.nih.gov). DPT by itself inhibited decorin’s ability to bind TGF-β1, and conversely decorin could compete DPT off TGF-β, suggesting they bind overlapping regions on the cytokine (pmc.ncbi.nlm.nih.gov). Intriguingly, when decorin and DPT were both present, the complex bound about 3-fold more TGF-β1 than either component alone (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In functional assays, dermatopontin markedly augmented the biological activity of TGF-β1 (pmc.ncbi.nlm.nih.gov). Specifically, in cells transfected with a TGF-β–responsive reporter (PAI-1 promoter-luciferase), the addition of DPT led to higher luciferase expression in response to TGF-β1 (pmc.ncbi.nlm.nih.gov). DPT alone did not activate the reporter, but it enhanced TGF-β’s effect. Correspondingly, in cell proliferation assays, DPT showed a weak growth-inhibitory effect by itself, but when combined with TGF-β1 it made TGF-β’s antiproliferative effect more potent (pmc.ncbi.nlm.nih.gov). The authors concluded that “dermatopontin increases the cellular response to TGF-β” and “modifies the behavior of TGF-β through interaction with decorin in the ECM” (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In simpler terms, dermatopontin can concentrate or present TGF-β1 to cell receptors by tweaking decorin’s sequestration of TGF-β. Decorin normally binds and neutralizes TGF-β; DPT appears to loosen this restraint, allowing more TGF-β to engage cells, thereby promoting TGF-β-mediated signaling. This finding is very relevant to tissue remodeling and pathology: TGF-β is key to collagen production and fibrosis, so DPT can indirectly boost matrix deposition via TGF-β. It may seem counterintuitive that DPT, which is downregulated in scars, enhances TGF-β (which promotes scarring). One interpretation is that DPT provides feedback control: in normal healing, DPT helps TGF-β drive productive repair, but in chronic fibrosis, sustained high TGF-β may suppress DPT (as noted in scars (pubmed.ncbi.nlm.nih.gov)), creating a vicious cycle of disordered matrix. In any case, the DPT–decorin–TGF-β axis is a prime example of dermatopontin’s role in modulating biochemical signals in the ECM microenvironment.

• Regulation of Cell Proliferation and Differentiation: By virtue of its effects on adhesion and growth factor signaling, dermatopontin influences fundamental cell behaviors. Generally, DPT tends to enforce a non-proliferative, differentiated state in cells embedded in the matrix. The UniProt functional summary notes that DPT “inhibits cell proliferation” (observed in multiple cell types) (www.proteinatlas.org). When cells adhere strongly to matrix (with DPT’s help) and are exposed to active TGF-β, they often exit the cell cycle and differentiate. For example, experiments in muscle cell culture (C2C12 myoblasts) showed that adding DPT or increasing its expression promoted myoblast differentiation into myotubes, while reducing cell proliferation (pmc.ncbi.nlm.nih.gov). DPT knockdown had the opposite effect: myoblasts with depleted DPT were less adherent, proliferated more, and had impaired differentiation (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). Similarly, in mesenchymal stem cells from the periodontal ligament, DPT expression rises during osteogenic differentiation, and if DPT is silenced, the stem cells show decreased mineralization and differentiation into osteoblasts (along with reduced proliferation capacity) (www.sciencedirect.com). These data suggest that DPT is required to create a pro-differentiation niche – likely by organizing the ECM and activating signals like TGF-β that push cells towards a mature phenotype. There are also indications that DPT can affect apoptosis and cell cycle via interactions not fully understood (some studies mention a potential integrin-mediated signaling pathway). However, the consistent theme is that dermatopontin discourages unchecked cell growth and encourages cells to adhere and specialize. This fits with its proposed role as a tumor suppressive factor in certain cancers (its loss in tumors could remove restraints on cell proliferation (pubmed.ncbi.nlm.nih.gov)). It’s important to note that in some contexts, DPT’s effect on proliferation is “context-dependent” – for instance, one study found DPT itself didn’t affect endothelial cell proliferation but still promoted angiogenic behavior (pubmed.ncbi.nlm.nih.gov). Nevertheless, in the majority of connective tissue cells studied (fibroblasts, myocytes, stem cells), DPT’s presence correlates with slower growth and enhanced differentiation, aligning with the needs of stable tissue maintenance (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

• Angiogenesis and Wound Healing: Beyond structural and growth factor roles, dermatopontin has been implicated in the process of new blood vessel formation (angiogenesis), particularly in healing wounds. DPT is strongly upregulated in the dermis surrounding wounds and in infarcted heart tissue, hinting it might assist tissue repair (pubmed.ncbi.nlm.nih.gov). A 2017 study provided evidence that dermatopontin has pro-angiogenic properties (pubmed.ncbi.nlm.nih.gov). In in vitro assays, adding recombinant DPT to endothelial cells did not make them proliferate, but it significantly promoted endothelial cell migration and tube formation on a Matrigel matrix (pubmed.ncbi.nlm.nih.gov). In organ explant models (aortic ring or CAM assays), DPT stimulated neovessel sprouting (pubmed.ncbi.nlm.nih.gov). Moreover, treating endothelial cells with DPT led to changes in gene expression: notably, it modulated the expression of TGF-β1 and integrin α3β1 in these cells (pubmed.ncbi.nlm.nih.gov). Both TGF-β1 and α3β1 integrin are known to influence angiogenesis (TGF-β has complex pro- and anti-angiogenic roles; α3β1 integrin helps endothelial cells interact with the matrix). The upregulation of these factors suggests a mechanism whereby DPT makes endothelial cells more responsive to the matrix and growth factors. The study concluded that “DPT possesses vital pro-angiogenic properties” and could have therapeutic value in chronic wounds (where inducing angiogenesis is beneficial) (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This pro-angiogenic effect may seem surprising given DPT’s anti-proliferative reputation, but in the coordinated setting of wound healing, DPT’s ability to organize matrix and present growth factors can indirectly favor angiogenesis. Indeed, wound healing is a context where DPT’s multiple roles converge: it strengthens the provisional matrix (via fibronectin/fibrin binding) (pmc.ncbi.nlm.nih.gov), helps recruit and anchor fibroblasts (via integrins) (pmc.ncbi.nlm.nih.gov), amplifies TGF-β to drive granulation tissue formation (pmc.ncbi.nlm.nih.gov), and apparently aids endothelial cells to invade and form new vessels (pubmed.ncbi.nlm.nih.gov). All these activities make DPT a key “architect” of the healing tissue. Consistently, wounds in Dpt-knockout mice exhibit delayed collagen maturation and possibly altered vascularization (though detailed in vivo wound studies are still limited).

• Other Molecular Interactions: Dermatopontin’s interactome extends to other matrix molecules. It has been shown to bind decorin (as discussed) and also was reported to interact with fibromodulin (another small ECM protein). In muscle cells, DPT and fibromodulin positively regulate each other’s expression, forming a regulatory loop that enhances myogenesis (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). DPT can also bind to the glycosaminoglycan components of proteoglycans – early work indicated DPT associates with decorin’s dermatan sulfate chain and perhaps other sulfated glycans (pubmed.ncbi.nlm.nih.gov). It is therefore part of a network of ECM proteins and proteoglycans that collectively determine matrix supramolecular structure. In invertebrate species, dermatopontin homologues (often called “SPOCK” or similar proteins in some organisms) act as cell adhesion molecules or elastic fibers (pubmed.ncbi.nlm.nih.gov). For instance, a DPT-like protein in sea anemone functions as an agglutinin that sticks cells or structures together (pubmed.ncbi.nlm.nih.gov). These evolutionary parallels reinforce that DPT’s fundamental role is to bind matrix components and cells together.

In summary, dermatopontin is a central player in ECM biology with multiple mechanisms: it reinforces the physical scaffold (by organizing collagen and fibronectin), it links cells to that scaffold (via integrins and proteoglycans), and it modulates the biochemical signals that control cell growth and differentiation (notably TGF-β). Through these actions, DPT helps maintain tissue homeostasis and orchestrate the complex events of tissue repair.

Recent Developments (2020–2024) and Current Research

In the past few years, research on DPT has accelerated, uncovering new roles and potential applications. Below are some recent developments (circa 2020-2024) highlighting dermatopontin’s importance:

• Dermatopontin as an Adipokine (Metabolic Research): A 2020 clinical study identified dermatopontin as a novel adipokine – a signaling protein secreted by adipose (fat) tissue (pubmed.ncbi.nlm.nih.gov). This study by Unamuno et al. examined DPT levels in obese vs. lean individuals. It found that circulating DPT protein is significantly elevated in obesity (including in obese patients with type 2 diabetes) compared to healthy controls (pubmed.ncbi.nlm.nih.gov). Likewise, DPT mRNA expression in visceral adipose tissue was higher in obese subjects (pubmed.ncbi.nlm.nih.gov). To understand the implications, researchers treated human adipocytes with various factors: pro-inflammatory stimuli (like LPS, a bacterial endotoxin, and the cytokine TGF-β) and a saturated fatty acid (palmitate) all upregulated DPT expression in fat cells (pubmed.ncbi.nlm.nih.gov). Conversely, anti-inflammatory cytokines IL-4 and IL-13 downregulated DPT (pubmed.ncbi.nlm.nih.gov). These treatments mimic the inflammatory environment of obesity, suggesting DPT is induced as part of the adipose tissue stress response. Functionally, when the researchers added recombinant DPT to adipocyte cultures, it triggered increased expression of ECM remodeling genes (such as collagen VI, elastin, MMP9) and pro-inflammatory cytokines (IL-6, IL-8, TNF-α) in those cells (pubmed.ncbi.nlm.nih.gov). In essence, DPT pushed adipocytes towards a more fibrotic, inflammatory state. This was the first evidence linking DPT to obesity-related tissue changes (pubmed.ncbi.nlm.nih.gov). The authors concluded that DPT contributes to extracellular matrix remodeling and inflammation in obesity, possibly exacerbating the fibrotic inflammatory milieu of expanding fat tissue (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This discovery positions DPT as both a biomarker of metabolic syndrome (circulating levels reflect obesity status) and a potential therapeutic target. If DPT drives adipose fibrosis (which is linked to insulin resistance), then inhibiting DPT might alleviate metabolic dysfunction – a concept so promising that a patent has been filed for “Dermatopontin as a therapeutic for metabolic disorders” (patents.google.com). While clinical therapies are not yet available, ongoing research is examining DPT’s role in conditions like type 2 diabetes, fatty liver disease, and cardiovascular risk in obesity.

• Musculoskeletal and Regenerative Medicine: Research has also focused on DPT in muscle and bone tissue contexts. In 2019, Kim et al. reported that dermatopontin is critical for skeletal muscle differentiation (myogenesis) (pmc.ncbi.nlm.nih.gov). They showed DPT enhances myoblast adhesion and fusion into myotubes, in part by interacting with fibronectin and fibromodulin in the muscle ECM (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Loss of DPT impeded muscle cell differentiation, which could have implications for muscle regeneration. More recently, a 2023 study explored DPT in periodontal ligament stem cells, which are progenitors that can differentiate into osteoblasts (bone-forming cells). The study found that DPT expression naturally increases when these stem cells are induced to undergo osteogenic differentiation, indicating DPT might be part of the program that builds bone matrix (www.sciencedirect.com). When DPT was knocked down in these cells, their ability to proliferate and to form mineralized bone nodules was significantly inhibited (www.sciencedirect.com). Conversely, providing extra recombinant DPT did not further boost proliferation, suggesting that a baseline level of DPT is necessary but additional DPT is not limiting (there may be a saturation point) (www.sciencedirect.com). The study also noted DPT rises during chondrogenic (cartilage) differentiation (www.sciencedirect.com), hinting at a broader role in skeletal tissue formation. These findings are driving interest in DPT for tissue engineering and regenerative medicine. For example, one could envisage coating scaffolds with DPT to improve stem cell adherence and differentiation in bone grafts. In fact, the importance of DPT in stem cell niches is highlighted by a patent from 2017 which proposes using DPT to maintain hematopoietic stem cells (HSCs) in culture (pmc.ncbi.nlm.nih.gov). This idea stemmed from observations that bone marrow stromal cells produce DPT and that HSCs adhere better and survive longer on DPT-containing matrices (pmc.ncbi.nlm.nih.gov). A related 2017 Stem Cell Reports study found that murine HSCs adhere more to decellularized bone marrow ECM containing DPT, although DPT knockout mice surprisingly did not show major hematopoietic deficits (likely due to compensation by other adhesion factors) (pmc.ncbi.nlm.nih.gov). Nonetheless, these advances underscore DPT’s utility in designing better stem cell culture systems or improving regeneration of tissues like muscle, bone, and marrow by harnessing its matrix-organizing functions.

• Osteoarthritis and Cartilage Degeneration: In 2024, Sun et al. published a systems biology study identifying DPT as a key gene in osteoarthritis (OA) progression (pmc.ncbi.nlm.nih.gov). By analyzing multiple patient gene expression datasets, they found DPT (along with HTRA1 and MXRA5) to be consistently overexpressed in OA cartilage compared to healthy cartilage (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Machine learning and validation in independent cohorts confirmed DPT is elevated in diseased joints and correlates with severity (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). DPT expression had a high diagnostic accuracy for OA (ROC AUC ≈ 0.84 in distinguishing OA vs. normal) (pmc.ncbi.nlm.nih.gov). Furthermore, high DPT levels in cartilage were associated with changes in immune cell infiltration: patients with higher DPT in their joint tissues showed greater presence of macrophages, neutrophils, and dendritic cells, and lower CD8 T cell levels, indicating DPT may be linked to inflammatory processes in the joint (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). While this study was correlative, it suggests that DPT could serve as a biomarker for OA and perhaps play a role in the cartilage breakdown or repair processes. One hypothesis is that increased DPT in OA reflects the chondrocytes’ attempt to remodel the damaged cartilage matrix (since DPT can promote collagen fibril assembly, its upregulation might be a response to collagen network disruption in arthritis). There is also interest in whether measuring DPT in synovial fluid could help in early detection of OA or monitoring of disease progression. This is an example of how newer research is translating the molecular knowledge of DPT into clinical contexts.

• Dermatopontin in Cancer: Although not entirely new, recent observations continue to support a role for DPT in tumor biology. As mentioned, low DPT expression is often noted in cancers such as liver cancer (pubmed.ncbi.nlm.nih.gov), and the Human Protein Atlas currently lists DPT as a favorable prognostic marker in liver HCC (meaning patients with higher DPT in their tumors tend to have better survival) (www.proteinatlas.org). In 2022-2023, bioinformatics studies of other cancers (e.g., breast, pancreatic) have begun to include DPT in signatures of stromal genes that correlate with outcomes or therapy response, although these are preliminary. Meanwhile, some cancer cell line experiments show that adding DPT can suppress proliferation or migration of tumor cells, consistent with its adhesive, anti-proliferative influence on the microenvironment. Another angle of cancer research is DPT’s role in angiogenesis: since tumors require new blood vessels, DPT’s pro-angiogenic effect (pubmed.ncbi.nlm.nih.gov) could paradoxically aid tumor growth if present. It has been reported that in certain cancers like breast carcinoma, stromal DPT is reduced, possibly to favor a more disorganized, neovascularized stroma. This complex role is the subject of ongoing investigation.

• Expert Commentary: Contemporary experts in matrix biology view dermatopontin as an important but somewhat underappreciated ECM component. A 2006 review called dermatopontin “a novel player in the biology of the extracellular matrix” (pubmed.ncbi.nlm.nih.gov) and described it as “largely uncharacterized” at the time, with multiple roles being gradually discovered. Fast-forward to late 2010s and 2020s, and the picture is much clearer: DPT is now recognized as a core organizer of the matrix and modulator of cell-matrix signaling. Its “cardinal roles in cutaneous wound healing” have been emphasized by researchers (pubmed.ncbi.nlm.nih.gov), and it is frequently classified among matricellular proteins like SPARC, osteopontin, and tenascin, which have regulatory (not purely structural) functions in the ECM. The accumulating evidence from recent studies – spanning metabolism, orthopedics, and immunology – highlights dermatopontin’s broad relevance. As Dr. Ashley Kramer and colleagues succinctly put in 2017, DPT is one of the ECM components that “cooperate with other ECM proteins to promote cell adherence” in niches like the bone marrow, but organisms can compensate for its loss to a degree (pmc.ncbi.nlm.nih.gov). This suggests functional redundancy in vivo, yet in situations of stress or disease (e.g., wound healing, metabolic overload, aging), DPT’s contributions become critical. Indeed, the presence of dermatopontin in a variety of specialized matrices (cornea, skin, muscle, etc.) indicates it was conserved for its ability to fine-tune tissue properties.

Current and Potential Applications

Given its influential role in extracellular matrix dynamics, dermatopontin is being explored in several applied contexts:

• Biomarker Potential: Changes in DPT levels in blood or tissues can reflect pathological remodeling. For instance, elevated serum DPT in obesity could serve as a biomarker for metabolic syndrome or adipose tissue fibrosis (pubmed.ncbi.nlm.nih.gov). Downregulation of DPT in skin fibrosis (keloids or scleroderma) might predict poor wound healing outcomes (pubmed.ncbi.nlm.nih.gov). In osteoarthritis, as noted, DPT is a candidate diagnostic biomarker for early cartilage degeneration (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Having a secreted protein like DPT measurable by ELISA or mass-spectrometry is advantageous; indeed, DPT has been detected in human plasma by mass spec and targeted proteomic assays (www.proteinatlas.org). Large-scale proteomic studies (e.g., in cardiovascular disease or aging) could clarify how DPT levels correlate with disease states. One caveat is that DPT is mostly matrix-bound, so blood levels may be low unless there is active tissue remodeling releasing it (such as during injury or in obesity where adipose releases matrix fragments). Still, in specific contexts, DPT has shown up as part of multi-marker panels for diseases (for example, a 2021 study in heart failure patients noted DPT among ECM proteins linked to cardiac fibrosis).

• Therapeutic Avenues: Direct therapeutic targeting of DPT is not yet in clinical trials, but a few strategies are conceivable:

• Enhancing DPT activity for tissue repair: Since dermatopontin fosters collagen and fibronectin organization, boosting its function might improve wound healing or skin aging. Cosmetic and dermatological applications are already being patented – a 2015 European patent describes “dermatopontin-activating peptides” to be included in topical formulations, aiming to increase DPT expression in the skin (patents.google.com) (patents.google.com). The idea is that higher DPT in aging or UV-damaged skin could ramp up collagen fibril formation and improve skin elasticity (essentially an anti-wrinkle strategy). While clinical evidence is pending, some skincare products are beginning to mention matricellular proteins like DPT as targets for “firming” treatments.
• Blocking DPT in fibrosis: In pathological fibrosis (e.g. liver cirrhosis, pulmonary fibrosis), one might consider inhibiting DPT to reduce TGF-β activation and fibrotic matrix assembly. However, given DPT is actually lower in many fibrotic scars (pubmed.ncbi.nlm.nih.gov), it’s unclear if further inhibition would help; paradoxically, increasing DPT might even normalize matrix deposition (by organizing collagen more properly). This area needs careful exploration. Notably, decorin, a binding partner of DPT, has anti-fibrotic effects by neutralizing TGF-β, so any intervention on DPT-decorin must consider the balance.
• Metabolic disease therapy: As mentioned, a patent (granted 2019) by researchers in Singapore proposes using DPT or modulators of DPT for treating metabolic disorders like obesity and diabetes (patents.google.com). This was driven by data that DPT is an adipocyte-secreted factor influencing metabolism. The therapeutic approach could be either to neutralize DPT (if DPT’s pro-fibrotic effect in fat is harmful) or to mimic it (if one aims to harness any beneficial signaling it might have systemically). The patent suggests DPT as a target to improve insulin sensitivity and reduce adipose inflammation. It’s a nascent concept – future studies in animal models will be needed to validate if modifying DPT levels can indeed ameliorate metabolic syndrome or fatty liver.
• Regenerative medicine and cell culture: DPT could be added to biomaterials or cell culture systems to improve cell adhesion and maintain stem cells. For example, coating culture dishes with recombinant dermatopontin might help hematopoietic stem cells stay in an undifferentiated but adherent state, thereby maintaining the stem cell pool during ex vivo expansion (a crucial challenge in bone marrow transplants). The 2017 patent WO2017021543A1 specifically claims the use of DPT to maintain HSCs in culture by preventing their differentiation or death (patents.google.com) (pmc.ncbi.nlm.nih.gov). Similarly, in tissue-engineered grafts for muscle or bone, incorporating DPT might enhance the integration and maturation of the graft by promoting ECM assembly. These applications are still experimental, but they leverage DPT’s natural role as a scaffold organizer.
• Drug targeting and signaling pathways: Understanding DPT’s position in pathways like TGF-β and integrin signaling opens up indirect targeting options. For instance, small molecules or biologics that disrupt the DPT–decorin interaction could modulate TGF-β activity in a tissue-specific manner (potential anti-fibrotic therapy). Conversely, peptides derived from DPT (like the DP-4 peptide) that mimic its adhesion site could be used to coat implants or wound dressings to improve cell attachment and healing (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). Another idea is using DPT as a carrier or scaffold for delivering growth factors in tissue repair, since it binds TGF-β – one could design a matrix with DPT to locally concentrate TGF-β where needed (for example, in bone healing, where TGF-β aids callus formation).

In all these potential applications, it will be crucial to balance DPT’s effects – too much DPT could lead to excessive matrix (fibrosis) and inflammation (as seen in obesity models) (pubmed.ncbi.nlm.nih.gov), while too little leads to frail matrix (as in the knockout mouse skin) (pubmed.ncbi.nlm.nih.gov). Therefore, therapeutic approaches might aim to normalize DPT levels or function rather than simply increase or decrease it arbitrarily.

Conclusion

Dermatopontin (DPT) is a prime example of an extracellular matrix protein that, despite being non-structural, profoundly influences tissue structure and function. It acts as a matrix organizer and a mediator of cell-matrix crosstalk. Key takeaways about DPT include:

• Structural Role: DPT binds major matrix proteins (collagens, fibronectin, fibrin) and promotes their assembly into stable fibrils and networks (pmc.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This activity is essential for proper tissue tensile strength – without DPT, collagen fibers form aberrantly (as evidenced by Ehlers-Danlos-like changes in DPT-null mice) (pubmed.ncbi.nlm.nih.gov).

• Adhesive and Signaling Role: Dermatopontin helps cells adhere to their surrounding matrix by bridging integrins and proteoglycans to the collagenous scaffold (pubmed.ncbi.nlm.nih.gov). Through these interactions, it can regulate cell shape, migration, and mechanical signaling. Additionally, by modulating growth factors like TGF-β (enhancing TGF-β signaling) (pmc.ncbi.nlm.nih.gov), DPT influences cellular proliferation and differentiation programs in the local environment. It essentially amplifies context-specific signals that tell a cell to slow down proliferation and start building or remodeling tissue.

• Physiological Importance: DPT is crucial in contexts such as wound healing, where it accelerates the formation of a functional repair matrix and assists in angiogenesis (pmc.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). It ensures that the initial scar has the right organization of fibers and that cells populate the wound correctly. It also plays roles in maintaining the normal architecture of skin, cornea, muscle, and other tissues during homeostasis.

• Pathological Implications: Dysregulation of DPT is associated with disease. Excessive matrix remodeling stimuli (inflammation, high TGF-β, mechanical stress) can alter DPT expression – sometimes up (as in obesity, where it contributes to fibrotic adipose tissue (pubmed.ncbi.nlm.nih.gov)), other times down (as in chronic scars or certain cancers, potentially to the tissue’s detriment (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov)). Because DPT’s functions are tightly linked to collagen quality and cell growth, its imbalance may exacerbate conditions like fibroses, osteoarthritis, or tumor progression. Conversely, restoring proper DPT function might mitigate such conditions by re-establishing normal matrix structure and signaling. For example, in osteoarthritis research, DPT’s elevation is being interpreted as part of the joint’s attempt to repair cartilage, and measuring it could guide interventions (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

• Future Directions: Ongoing research is delving into structural biology of DPT (to design mimetics or inhibitors), omics studies in human diseases (to firmly establish its biomarker utility), and therapeutic experiments in animal models (e.g., testing if DPT modulation affects obesity-related fibrosis or improves wound healing outcomes). As an ECM protein, DPT is an attractive drug target because therapies can be delivered locally (e.g., in a wound or joint) to minimize systemic effects. The coming years will likely see more insights from fibrosis and regenerative medicine fields about how DPT can be leveraged.

In conclusion, dermatopontin serves as a critical node in the extracellular matrix: it connects the dots between structural scaffold, cell adhesion, and growth factor signaling. This integrative role is what makes it so impactful – and also why disturbances in DPT levels reverberate through tissues. Prioritizing recent findings, we now appreciate that DPT is involved not only in classical connective tissue function but also in metabolic and immune-related remodeling of tissues. With its newly recognized status as an adipokine and a biomarker in joint disease, DPT has moved to the forefront as a protein of interest in translational research. Efforts to manipulate DPT or its pathways hold promise for novel therapies in wound healing, fibrotic diseases, osteoarthritis, and possibly metabolic disorders. As our understanding grows, dermatopontin exemplifies how a once “obscure” matrix protein can emerge as a key orchestrator of functional anatomy, bridging the gap between cells and the scaffolds that support them (pmc.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov).

References: (Key cited works are embedded as inline citations above, with publication sources and dates for verification. Recent sources from 2019–2024 were prioritized to reflect the latest research.)

Citations

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116. AnnotationURLCitation(end_index=43408, start_index=43229, title='Dermatopontin in Bone Marrow Extracellular Matrix Regulates Adherence but Is Dispensable for Murine Hematopoietic Cell Maintenance - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5599243/#:~:text=mass%20spectrometry%20and%20found%20dermatopontin,There%20are%20likely%20overlapping%20cellular')
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119. AnnotationURLCitation(end_index=44767, start_index=44586, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=analysis%20identified%20ALB%2C%20HTRA1%2C%20DPT%2C,ssGSEA%20results%20revealed%20that%20abnormal')
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122. AnnotationURLCitation(end_index=45577, start_index=45435, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=progression,results%20also%20confirmed%20these%20findings')
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124. AnnotationURLCitation(end_index=46038, start_index=45860, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=patients%2C%20while%20HTRA1%2C%20DPT%2C%20MXRA5%2C,validation%20set%2C%20only%20three%20genes')
125. AnnotationURLCitation(end_index=46528, start_index=46363, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=Correlation%20between%20HTRA1%2C%20DPT%2C%20MXRA5%2C,P%E2%80%89%3C%E2%80%890.001')
126. AnnotationURLCitation(end_index=46656, start_index=46529, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=match%20at%20L432%20analysis%20revealed,8D')
127. AnnotationURLCitation(end_index=47700, start_index=47544, title='Dermatopontin is expressed in human liver and is downregulated in hepatocellular carcinoma - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/19916908/#:~:text=The%20results%20showed%20that%20DPT,via%20possible%20interaction%20with%20TGF')
128. AnnotationURLCitation(end_index=47996, start_index=47876, title='DPT protein expression summary - The Human Protein Atlas', type='url_citation', url='https://www.proteinatlas.org/Q07507#:~:text=CANCER%20%26%20CELL%20LINES%20Prognostic,i%7D%20No')
129. AnnotationURLCitation(end_index=48725, start_index=48560, title='Dermatopontin augments angiogenesis and modulates the expression of transforming growth factor beta 1 and integrin alpha 3 beta 1 in endothelial cells - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/28336087/#:~:text=assays%20apparently%20depicted%20that%20DPT,managing%20chronic%20wounds%20and%20cancer')
130. AnnotationURLCitation(end_index=49390, start_index=49231, title='Dermatopontin, a novel player in the biology of the extracellular matrix - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/16987749/#:~:text=well%20conserved%20among%20the%20species,an%20infarct%20zone%20of%20experimental')
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132. AnnotationURLCitation(end_index=50645, start_index=50466, title='Dermatopontin in Bone Marrow Extracellular Matrix Regulates Adherence but Is Dispensable for Murine Hematopoietic Cell Maintenance - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5599243/#:~:text=mass%20spectrometry%20and%20found%20dermatopontin,There%20are%20likely%20overlapping%20cellular')
133. AnnotationURLCitation(end_index=51506, start_index=51392, title='Dermatopontin, A Novel Adipokine Promoting Adipose Tissue Extracellular Matrix Remodelling and Inflammation in Obesity - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/32283761/#:~:text=of%20DPT%20on%20ECM%20remodelling,p')
134. AnnotationURLCitation(end_index=51740, start_index=51614, title='Dermatopontin expression is decreased in hypertrophic scar and systemic sclerosis skin fibroblasts and is regulated by transforming growth factor-beta1, interleukin-4, and matrix collagen - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/10233760/#:~:text=expression%20of%20dermatopontin%20mRNA%20and,We')
135. AnnotationURLCitation(end_index=52018, start_index=51848, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=match%20at%20L56%20HTRA1%2C%20DPT%2C,progression%20and%20immune%20cell%20infiltration')
136. AnnotationURLCitation(end_index=52197, start_index=52019, title='Identification of HTRA1, DPT and MXRA5 as potential biomarkers associated with osteoarthritis progression and immune infiltration - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC11325630/#:~:text=patients%2C%20while%20HTRA1%2C%20DPT%2C%20MXRA5%2C,validation%20set%2C%20only%20three%20genes')
137. AnnotationURLCitation(end_index=52541, start_index=52381, title='DPT protein expression summary - The Human Protein Atlas', type='url_citation', url='https://www.proteinatlas.org/Q07507#:~:text=PROTEINS%20IN%20BLOOD%20Upregulated%20in,i%7D%20Data%20available%20%28High%20detectability')
138. AnnotationURLCitation(end_index=53762, start_index=53630, title='EP2638059B1 - Dermatopontin-activating peptides and cosmetic compositions including same - Google Patents', type='url_citation', url='https://patents.google.com/patent/EP2638059B1/en#:~:text=,N%20Glycerine%20Chemical%20compound%20OCC%28O%29CO')
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140. AnnotationURLCitation(end_index=54596, start_index=54470, title='Dermatopontin expression is decreased in hypertrophic scar and systemic sclerosis skin fibroblasts and is regulated by transforming growth factor-beta1, interleukin-4, and matrix collagen - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/10233760/#:~:text=expression%20of%20dermatopontin%20mRNA%20and,We')
141. AnnotationURLCitation(end_index=55322, start_index=55155, title='US10398752B2 - Dermatopontin as a therapeutic for metabolic disorders - Google Patents', type='url_citation', url='https://patents.google.com/patent/US10398752B2/ja#:~:text=Publication%20date%202019,Publication%20of%20US20180036371A1%20publication%20Critical')
142. AnnotationURLCitation(end_index=56630, start_index=56448, title='WO2017021543A1 - Use of dermatopontin for maintaining hematopoietic stem and/or progenitor cells in culture - Google Patents', type='url_citation', url='https://patents.google.com/patent/WO2017021543A1/en#:~:text=and%2For%20progenitor%20cells%20in%20culture,the%20survival%2Fproliferation%20of%20HSCs%20cultured')
143. AnnotationURLCitation(end_index=56810, start_index=56631, title='Dermatopontin in Bone Marrow Extracellular Matrix Regulates Adherence but Is Dispensable for Murine Hematopoietic Cell Maintenance - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC5599243/#:~:text=mass%20spectrometry%20and%20found%20dermatopontin,There%20are%20likely%20overlapping%20cellular')
144. AnnotationURLCitation(end_index=57727, start_index=57595, title='Dermatopontin promotes epidermal keratinocyte adhesion via alpha3beta1 integrin and a proteoglycan receptor - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/19928997/#:~:text=Adhesion%20of%20HaCaT%20cells%20to,4%20was%20strongly')
145. AnnotationURLCitation(end_index=57868, start_index=57728, title='Dermatopontin promotes epidermal keratinocyte adhesion via alpha3beta1 integrin and a proteoglycan receptor - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/19928997/#:~:text=adhesive%20activity%20of%20dermatopontin,We%20conclude%20that')
146. AnnotationURLCitation(end_index=58488, start_index=58320, title='Dermatopontin, A Novel Adipokine Promoting Adipose Tissue Extracellular Matrix Remodelling and Inflammation in Obesity - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/32283761/#:~:text=expression%20levels%20of%20DPT%20were,influencing%20AT%20remodelling%20and%20inflammation')
147. AnnotationURLCitation(end_index=58675, start_index=58561, title='Dermatopontin, a novel player in the biology of the extracellular matrix - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/16987749/#:~:text=decorin%29,beta1%20interacts%20with')
148. AnnotationURLCitation(end_index=59410, start_index=59256, title='Dermatopontin Interacts with Fibronectin, Promotes Fibronectin Fibril Formation, and Enhances Cell Adhesion - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC3083196/#:~:text=electron%20microscopy,by%20changing%20the%20fibronectin%20conformation')
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150. AnnotationURLCitation(end_index=59852, start_index=59738, title='Dermatopontin, a novel player in the biology of the extracellular matrix - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/16987749/#:~:text=decorin%29,beta1%20interacts%20with')
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