Human ANXA1 (annexin A1): functional annotation research report Falcon Edison Scientific Literature 58 citations 1 artifacts 2026-10-05T01:34:22.004677

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Human ANXA1 (annexin A1): functional annotation research report

Identity and scope. The specified target is human ANXA1, UniProt P04083, also called annexin I and lipocortin 1. The supplied identity agrees with the literature: ANXA1 is a 346-amino-acid, approximately 37-kDa member of the annexin family, distinct from the related genes ANXA2 and ANXA11. Its conserved core contains four approximately 70-residue annexin repeats; its divergent amino terminus helps determine protein interactions and biological specificity. ANXA2’s characteristic endothelial fibrinolytic role, for example, should not be assigned to ANXA1. The accession itself comes from the supplied UniProt record; the cited literature independently corroborates the protein name, human family membership, architecture, and lipocortin designation. (araujo2021annexina1as pages 6-7, gerke2024annexins—afamilyof pages 1-2, moss2004theannexins pages 1-2, moss2004theannexins pages 5-6)

Primary molecular function

ANXA1 is a calcium-regulated membrane-binding scaffold and an extracellular pro-resolution signal—not a metabolic enzyme or transporter. Calcium binds sites in its annexin core and helps bridge its convex surface to negatively charged membrane phospholipids, including phosphatidylserine; membrane lipid composition affects association. The distinctive N-terminal region mediates interactions with partners, notably S100A11, and contains the activity reproduced by the experimental N-acetylated peptide Ac2–26. This architecture supports membrane apposition and remodeling inside cells, while externalized ANXA1 can engage formyl peptide receptors on other cells. These are related but spatially distinct activities. (gerke2024annexins—afamilyof pages 4-5, gerke2024annexins—afamilyof pages 1-2, ashraf2022theresealingfactor pages 1-2, qin2022formylpeptidereceptor2 pages 4-5)

The historical designation phospholipase A2 inhibitory protein describes regulation of phospholipase activity, not a reaction catalyzed by ANXA1. Cellular and biochemical studies associate ANXA1 with inhibition of cytosolic phospholipase A2 (cPLA2), including reported physical interaction and reduced cPLA2 phosphorylation or activation. cPLA2—not ANXA1—cleaves the sn-2 bond of phospholipids, releasing fatty acids such as arachidonic acid for inflammatory lipid-mediator synthesis. ANXA1–cPLA2 interactions are cell-dependent; inhibition must not be treated as ANXA1’s universal or sole mechanism, nor as evidence that ANXA1 has an enzymatic substrate specificity. (lim2007annexin1the pages 2-3)

Where the protein acts, and in which pathways

At rest and during membrane stress. ANXA1 is principally cytosolic, with regulated association with the plasma membrane and endosomal membranes. In human neutrophils, a pool resides in gelatinase granules and moves to the surface during activation and endothelial interaction; glucocorticoids increase its expression and/or externalization in relevant settings. ANXA1 lacks a conventional secretory signal sequence, so surface exposure and release involve nonclassical routes, including granule mobilization and extracellular vesicles. Serine-27 phosphorylation has been implicated in secretion. A human chronic-kidney-disease study illustrates why localization matters: patients’ neutrophils had more intracellular but less membrane-associated ANXA1, alongside impaired effective extracellular release, despite increased FPR2 expression. (ansari2018therapeuticpotentialof pages 3-4, gavins2012annexina1and pages 2-3, gerke2024annexins—afamilyof pages 8-9, scharf2024gpcrsoverexpressionand pages 1-2, scharf2024gpcrsoverexpressionand pages 7-10, d’acquisto2008annexin‐a1apivotal pages 5-6)

Outside the cell: ANXA1 → FPR2/ALX → inflammation resolution. The best-established organism-level role is to limit excessive leukocyte recruitment and promote the active resolution of inflammation. Externalized full-length ANXA1 preferentially activates human FPR2/ALX, a cell-surface G-protein-coupled receptor. In leukocyte and tissue models, this signaling limits neutrophil rolling, adhesion and tissue accumulation, supports neutrophil apoptosis, and facilitates macrophage clearance of apoptotic cells (efferocytosis). ANXA1 and its peptide are not pharmacologically interchangeable: an authoritative IUPHAR review reports detectable full-length ANXA1 binding to human FPR1 only at approximately 10 µM, versus a reported FPR2 EC₅₀ of 0.15 µM; Ac2–26 acts at both FPR1 and FPR2, with approximately 1 µM EC₅₀ values. Mouse Fpr2/3 biology must likewise not be equated without qualification to the human receptor. (sugimoto2016annexina1and pages 2-3, qin2022formylpeptidereceptor2 pages 4-5, qin2022formylpeptidereceptor2 pages 2-4)

This is a defined signaling interaction, not a claim that every FPR2 ligand is anti-inflammatory. In a primary receptor study, full-length ANXA1, unlike pro-inflammatory serum amyloid A, changed the signal from pre-existing FPR2 homodimers. ANXA1 activated a p38–MAPKAPK–HSP27 pathway and increased anti-inflammatory IL-10 release from human monocytes; the IL-10 response to injected ANXA1 was approximately threefold in mice and absent in the corresponding Fpr2/3-knockout animals. Ac2–26 also engaged an FPR1–FPR2-associated JNK/caspase-3 pathway that promoted human neutrophil apoptosis. The observations support ligand- and receptor-context-dependent signaling, rather than a single downstream pathway for every cell. (cooray2013ligandspecificconformationalchange pages 1-2, cooray2013ligandspecificconformationalchange pages 3-4, qin2022formylpeptidereceptor2 pages 4-5)

Inside the cell: membrane-contact tethering and receptor sorting. A particularly precise ANXA1-specific structural role is at contacts between the endoplasmic reticulum (ER) and EGFR-positive multivesicular endosomes. There, endosomal ANXA1 and ER-associated S100A11 help tether the two membranes. In human HeLa cells, ANXA1 depletion selectively reduced these contacts and caused increased, prolonged EGFR tyrosine phosphorylation: contacts normally allow ER-associated phosphatase PTP1B access to endosomal EGFR and support its sorting into intraluminal vesicles. When endosomal LDL-derived cholesterol is scarce, these contacts also enable ER-to-endosome cholesterol delivery, needed for vesicle formation; ORP1L interacting with ER VAP proteins, rather than ANXA1 itself, is implicated in the sterol-transfer step. This distinction is essential: ANXA1 is a contact-site organizer, not a demonstrated cholesterol transporter or phosphatase. Eden and colleagues’ Figure 1 provides visual evidence of ANXA1 at the contacts and of reduced contacts—but increased EGFR phosphorylation—after ANXA1 knockdown. (eden2016annexina1tethers pages 1-4, eden2016annexina1tethers pages 6-8, eden2016annexina1tethers pages 4-6, eden2016annexina1tethers media 28ac0583)

At damaged plasma membranes and endothelial junctions. Calcium influx can recruit ANXA1 to plasma-membrane wounds, where membrane organization and interaction with S100A11 may aid repair. This is a context-dependent, not universally indispensable, function: experiments in endothelial cells distinguish ANXA1 from ANXA2 because loss of S100A11 substantially impairs ANXA2, but not ANXA1, recruitment to wounds; S100A11 can also promote resealing through extended synaptotagmin-1 independently of its annexin-binding function. A 2024 expert review additionally cautions that ANXA1 can be dispensable for immediate myofiber resealing while contributing to subsequent regeneration. At cerebral microvascular endothelium, experimental evidence links ANXA1 to cell-contact/cortical-actin organization and barrier integrity. A December 2024 mouse sepsis study found that ANXA1 deficiency worsened blood–brain-barrier leakage; Ac2–26 restored endothelial occludin and ZO-1 and reduced permeability in a murine endothelial-cell model, with VEGF-A counteracting protection. These experiments do not establish the same therapeutic effect in patients. (gerke2024annexins—afamilyof pages 6-8, ashraf2022theresealingfactor pages 1-2, li2024annexina1mitigates pages 5-8, mcarthur2016therestorativerole pages 4-5, li2024annexina1mitigates pages 8-11)

Recent mechanistic developments and applications, 2023–2024

Extracellular-vesicle signaling, May 2024. Vesicles obtained from human bronchial epithelial cells contained ANXA1. In inflamed epithelial-cell experiments, recombinant ANXA1 suppressed NF-κB phosphorylation, and the FPR2 antagonist WRW4 reversed vesicle-associated suppression of NF-κB in bronchial and alveolar type II epithelial cells. Intratracheal delivery of these vesicles reduced inflammatory readouts in mice with acute lung injury. Vesicles also carried immunomodulatory microRNAs; the study did not genetically deplete vesicular ANXA1 to establish that it alone caused the entire therapeutic effect. This is an experimental application, not a clinical treatment. Fujita et al., Communications Biology, May 2024; DOI: 10.1038/s42003-024-06197-3. (fujita2024mitigationofacute pages 1-2, fujita2024mitigationofacute pages 7-9)

Intracellular adipogenesis pathway, August 2024. ANXA1 binds PDLIM7 in adipose stromal vascular cells, competing with MYCBP2 for that partner. The resulting availability of MYCBP2 promotes K48-linked ubiquitination and proteasomal loss of SMAD4, reducing PPARγ expression and adipocyte differentiation. Interaction, knockdown, ubiquitination, proteasome-inhibition and pathway-epistasis experiments support this more specific intracellular mechanism. Ac2–26 also interacted with PDLIM7 in the reported experiments. Human obese adipose tissue showed elevated ANXA1, whereas the protective deletion/overexpression and treatment tests were chiefly cellular and mouse experiments. The study did not establish that its PDLIM7 effects require—or do not require—FPR2. Fang et al., Signal Transduction and Targeted Therapy, August 2024; DOI: 10.1038/s41392-024-01930-0. (fang2024annexina1binds pages 1-2, fang2024annexina1binds pages 10-12, fang2024annexina1binds pages 12-13, fang2024annexina1binds pages 8-10)

Metabolic FPR2 signaling, December 2024. In obese mice and palmitate-challenged cardiomyocytes, Ac2–26 activated an FPR2–AMPK pathway associated with enhanced fatty-acid oxidation, less lipid deposition and lower atrial-fibrillation susceptibility; FPR2 antagonism and myocardial AMPK knockdown weakened protection. Human atrial transcriptomes and a serum comparison of 30 atrial-fibrillation patients and 26 controls supplied associations, not evidence that treating human AF with ANXA1 is effective. Liu et al., Cardiovascular Diabetology, December 2024; DOI: 10.1186/s12933-024-02545-z. (liu2024anxa1fpr2axismitigates pages 6-7, liu2024anxa1fpr2axismitigates pages 1-2)

Investigational diagnostics and therapeutics. In a November 2024 periodontal case–control study (25 patients and 25 controls), salivary and serum ANXA1 were lower with periodontitis (p = 0.0177 and <0.0001, respectively); this establishes an association, not a validated diagnostic test. A May 2024 laryngeal-cancer study found compartment-dependent results: exosomal ANXA1 was increased across combined stages, approximately 2.5-fold by validation ELISA, whereas whole-serum ANXA1 was reduced at several earlier stages. The authors called for larger validation. In a separate January 2024 preclinical study, the ANXA1-binding antibody MDX-124 reduced proliferation of ANXA1-expressing cancer cell lines (p < 0.013) and tumor growth in two mouse models (p < 0.0001). None of these findings alone establishes routine clinical use of an ANXA1 assay, ANXA1 peptide or anti-ANXA1 antibody. Yilmaz et al., Scientific Reports, November 2024; DOI: 10.1038/s41598-024-80418-x; Schuster et al., Cancers, May 2024; DOI: 10.3390/cancers16112028; Al-Ali et al., Oncogene, January 2024; DOI: 10.1038/s41388-023-02919-9. (schuster2024exosomalserumbiomarkers pages 14-15, yilmaz2024annexinlevelsin pages 1-2, alali2024atherapeuticantibody pages 1-2, schuster2024exosomalserumbiomarkers pages 7-8)

Interpretation and confidence

The strongest functional annotation is a calcium-responsive phospholipid-binding adaptor with two established spatial modes of action: intracellular membrane organization/tethering, and extracellular signaling—principally via FPR2—that regulates leukocyte traffic and inflammatory resolution. Perturbation and localization experiments directly support the endosome-contact mechanism; human-cell signaling experiments support FPR2-dependent effects; much disease-protection evidence still comes from mice. Effects are not uniformly protective: a 2023 mouse study found that Ac2–26 activated platelets via Fpr2/3, increasing fibrinogen binding, P-selectin exposure and platelet–leukocyte aggregates, while ANXA1 derived from neutrophils enhanced melanoma-cell invasion in an experimental tumor setting. Consequently, the protein’s location, intact versus peptide form, receptor repertoire and cellular setting are necessary parts of any functional annotation. Zharkova et al., International Journal of Molecular Sciences, February 2023; DOI: 10.3390/ijms24043424; Sandri et al., Cells, January 2023; DOI: 10.3390/cells12030425. (gerke2024annexins—afamilyof pages 4-5, eden2016annexina1tethers pages 4-6, cooray2013ligandspecificconformationalchange pages 1-2, qin2022formylpeptidereceptor2 pages 2-4, zharkova2023deletionofannexin pages 4-7, sandri2023roleofannexin pages 1-2)

References

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  29. (fang2024annexina1binds pages 1-2): Lu Fang, Changjie Liu, Zong-zhe Jiang, Mengxiao Wang, Kang Geng, Yangkai Xu, Yujie Zhu, Yiwen Fu, Jing Xue, Wenxin Shan, Qi Zhang, Jie Chen, Jiahong Chen, Mingming Zhao, Yuxuan Guo, K. W. Michael Siu, Y. Eugene Chen, Yong Xu, Donghui Liu, and Lemin Zheng. Annexin a1 binds pdz and lim domain 7 to inhibit adipogenesis and prevent obesity. Signal Transduction and Targeted Therapy, Aug 2024. URL: https://doi.org/10.1038/s41392-024-01930-0, doi:10.1038/s41392-024-01930-0. This article has 24 citations and is from a peer-reviewed journal.

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Artifacts

## Context ID: pqac-00000059 The requested visual content from Eden et al. (2016) is found in Figure 1. - Figure 1C shows that ANXA1 siRNA significantly decreas

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