STOML3 (Stomatin-like Protein 3): A Comprehensive Research Report

1. Introduction and Summary

Stomatin-like protein 3 (STOML3, also known as SLP3 or SRO) is a membrane-associated scaffolding protein that plays essential roles in sensory transduction, particularly in mechanosensation and, more recently discovered, in olfaction. STOML3 belongs to the highly conserved stomatin/prohibitin/flotillin/HflK (SPFH) domain protein family, which is characterized by a structurally conserved core domain of approximately 120 amino acids called the stomatin domain [lapatsina-2011-stomatin-review-abstract]. The protein was first identified in mouse olfactory epithelium in 2002 and was subsequently demonstrated to be essential for touch sensation in mammals through its ability to modulate the activity of mechanosensitive ion channels [wetzel-2006-stoml3-touch-abstract].

STOML3 functions as a membrane-bound scaffolding protein that sensitizes mechanically gated ion channels, including the Piezo family of mechanosensitive channels (Piezo1 and Piezo2), to detect molecular-scale displacements as small as ~13 nanometers [poole-2014-piezo-stoml3-summary]. This remarkable sensitivity is achieved through STOML3's ability to bind cholesterol and stiffen the plasma membrane, thereby facilitating efficient force transfer to the associated ion channels [qi-2015-cholesterol-stoml3-summary]. The protein forms oligomeric complexes and localizes to cholesterol-rich lipid rafts and mobile vesicle pools within sensory neurons.

The importance of STOML3 for mammalian mechanosensation was established through studies demonstrating that approximately 35% of skin mechanoreceptors fail to respond to mechanical stimuli in STOML3 knockout mice [wetzel-2006-stoml3-touch-abstract]. Furthermore, STOML3 has emerged as a therapeutic target for chronic pain, as small-molecule inhibitors of STOML3 oligomerization can reverse mechanical hypersensitivity in neuropathic pain models [wetzel-2016-stoml3-inhibitors-abstract].

2. Gene and Protein Structure

2.1 Gene Information

The human STOML3 gene is located on chromosome 13 (13q13.3) and encodes a protein of 287 amino acids with a calculated molecular weight of approximately 32 kDa (UniProt: Q8TAV4). The protein belongs to the band 7/mec-2 family, which includes other stomatin-related proteins such as stomatin, STOML1, STOML2, and podocin [lapatsina-2011-stomatin-review-abstract].

2.2 Domain Architecture

STOML3 contains several characteristic structural features:

The Band-7/stomatin domain (IPR001107, IPR043202) forms the core of the protein and is highly conserved across species, from bacteria to humans. This domain mediates oligomerization and is essential for STOML3 function in modulating ion channel activity [lapatsina-2011-stomatin-review-abstract]. Structure-function experiments have demonstrated that the stomatin domain is specifically required for STOML3's ability to sensitize Piezo channels, with higher-order scaffolds being a prerequisite for function [poole-2014-piezo-stoml3-summary].

A hydrophobic membrane insertion region near the N-terminus anchors STOML3 to the plasma membrane. This region contains a critical proline residue at position 40 (P40) that is highly conserved among stomatin family members and is essential for the protein's association with cholesterol-rich lipid rafts [qi-2015-cholesterol-stoml3-summary]. The P40 residue is essential for the hairpin-loop membrane topology; mutation of this proline to serine (P40S) converts STOML3 to a single-pass transmembrane form that cannot associate with cholesterol or modulate mechanosensitive channels [qi-2015-cholesterol-stoml3-summary].

The N-terminal hydrophobic region is required for vesicular localization of STOML3 and regulates its physical and functional interaction with acid-sensing ion channels (ASICs) [lapatsina-2012-asic-vesicle-summary].

3. Primary Molecular Function

STOML3 functions as a membrane scaffolding protein that sensitizes mechanically gated ion channels to detect mechanical stimuli. The protein does not itself form ion channels but rather modulates the activity of existing mechanosensitive channels through several interconnected mechanisms.

3.1 Sensitization of Piezo Channels

The most well-characterized function of STOML3 is its ability to sensitize Piezo1 and Piezo2 mechanosensitive ion channels. According to PubMed, Poole et al. (2014) demonstrated that STOML3 brings the activation threshold for Piezo channels down to approximately 10 nanometers, a roughly 10-fold sensitization compared to channels lacking STOML3 [DOI: 10.1038/ncomms4520] [poole-2014-piezo-stoml3-summary]. This sensitization is specific to STOML3 among stomatin-domain proteins tested; stomatin, STOML1, and STOML2 were not able to achieve similar effects.

The sensitization mechanism involves STOML3's ability to form oligomeric scaffolds. Disruption of STOML3 oligomerization with small-molecule inhibitors reversibly reduces the sensitivity of mechanically gated currents in sensory neurons [wetzel-2016-stoml3-inhibitors-abstract].

3.2 Membrane Stiffening via Cholesterol Recruitment

A major mechanistic insight came from the work of Qi et al. (2015), which demonstrated that STOML3 controls membrane mechanics by binding cholesterol and forming stiffened membrane microdomains [DOI: 10.1038/ncomms9512] [qi-2015-cholesterol-stoml3-summary]. Using atomic force spectroscopy (AFS), the authors showed that:

• STOML3 knockout sensory neurons have softer membranes compared to wild-type
• STOML3-deficient neurons have lower membrane tension
• STOML3-deficient neurons have increased membrane viscosity

This stiffened membrane facilitates force transfer to mechanosensitive channels. The model proposes that cholesterol recruited by STOML3 creates a specialized membrane platform that redirects, rescales, and confines mechanical force, making it available to gate associated ion channels [qi-2015-cholesterol-stoml3-summary].

3.3 Modulation of ASIC Channels

STOML3 also interacts with and modulates acid-sensing ion channels (ASICs). According to PubMed, Lapatsina et al. (2012) demonstrated that STOML3 interacts with stomatin and ASIC subunits, and that this interaction occurs in a highly mobile vesicle pool in dorsal root ganglia neurons [DOI: 10.1098/rsob.120096] [lapatsina-2012-asic-vesicle-summary]. STOML3 suppresses the magnitude and modulates the inactivation kinetics of proton-gated currents carried by recombinant ASICs.

Studies using double knockout mice have revealed complex interactions between stomatin-domain proteins and ASICs. According to PubMed, Moshourab et al. (2013) found that the loss of STOML3 in ASIC3 knockout mice markedly exacerbates deficits in the mechanosensitivity of nociceptors [DOI: 10.1113/jphysiol.2013.261180] [moshourab-2013-asic-interaction-summary], demonstrating functional cooperation between these proteins.

4. Subcellular Localization

STOML3 exhibits specific subcellular localization patterns that are critical for its function in sensory transduction.

4.1 Plasma Membrane and Lipid Rafts

STOML3 is enriched in cholesterol-rich membrane fractions, as demonstrated by sucrose-density-gradient centrifugation experiments [qi-2015-cholesterol-stoml3-summary]. In sensory neurons, STOML3 displays a punctate pattern in neurites, consistent with localization to discrete membrane microdomains [poole-2014-piezo-stoml3-fulltext].

The association with lipid rafts is dependent on the conserved proline residue at position 40. The P40S mutant is mainly detected in non-raft fractions and displays uniform distribution rather than the punctate pattern seen with wild-type STOML3 [qi-2015-cholesterol-stoml3-summary].

4.2 Mobile Vesicle Pool

A significant fraction of STOML3 localizes to a highly mobile vesicle pool in DRG neurons [lapatsina-2012-asic-vesicle-summary]. These vesicles are:

• Rab11-positive (indicating recycling endosomes)
• Not part of early-endosomal, lysosomal, or Rab14-dependent biosynthetic compartments
• Microtubule-dependent for their movement

The authors proposed that this vesicular pool may represent a "transducosome" – a mobile compartment containing molecules critical for sensory transduction. Disruption of microtubule dynamics leads to incorporation of STOML3 into the plasma membrane and increased acid-gated currents, suggesting that trafficking between vesicular and plasma membrane pools is physiologically regulated [lapatsina-2012-asic-vesicle-summary].

4.3 Olfactory Cilia

In olfactory sensory neurons (OSNs), STOML3 is predominantly localized to the dendritic knob and proximal portions of olfactory cilia, the site of olfactory transduction [agostinelli-2021-olfaction-summary]. This localization places STOML3 in proximity to key olfactory transduction components including adenylyl cyclase III (ACIII), which has been shown to physically interact with STOML3.

5. Biological Processes and Pathways

5.1 Touch Sensation and Mechanotransduction

STOML3 is essential for normal touch sensation in mammals. The seminal 2006 study by Wetzel et al. demonstrated that approximately 35% of skin mechanoreceptors do not respond to mechanical stimuli in STOML3 knockout mice [DOI: 10.1038/nature05394] [wetzel-2006-stoml3-touch-abstract]. Both rapidly adapting (RA) and slowly adapting (SA) mechanoreceptors are affected, although the proportion of affected fibers varies by type.

STOML3 appears to function downstream of channel gating, as evidenced by the finding that cholesterol depletion affects both RA channels (which require a protein tether) and SA channels (which are thought to be directly stretch-activated). This suggests STOML3 modulates mechanosensitivity through a general mechanism involving membrane mechanics rather than through direct effects on channel gating [qi-2015-cholesterol-stoml3-fulltext].

The mechanistic pathway involves:
1. STOML3 binding to cholesterol to form stiffened membrane platforms
2. Efficient force transfer from the extracellular matrix to membrane-embedded channels
3. Lowered activation threshold of mechanosensitive channels (Piezo1, Piezo2)
4. Generation of receptor potentials leading to action potential firing

5.2 Pain and Nociception

STOML3 plays important roles in both normal and pathological pain processing. In knockout mice, tactile-driven behaviors are impaired, including touch-evoked pain caused by neuropathic injury [wetzel-2006-stoml3-touch-abstract].

The interactions between STOML3 and ASICs are particularly important for nociceptor function. According to PubMed, double knockout studies revealed that loss of stomatin or STOML3 in ASIC knockout mice markedly exacerbates deficits in the mechanosensitivity of A∂- and C-fiber nociceptors without affecting mechanoreceptor function [moshourab-2013-asic-interaction-summary]. This suggests that STOML3-ASIC interactions are particularly important for mechanical pain sensing.

Importantly, STOML3 has been validated as a therapeutic target for chronic pain. According to PubMed, Wetzel et al. (2016) identified small-molecule inhibitors of STOML3 oligomerization (such as OB-1) that reversibly reduce the sensitivity of mechanically gated currents in sensory neurons and silence mechanoreceptors in vivo [DOI: 10.1038/nn.4454] [wetzel-2016-stoml3-inhibitors-abstract]. These inhibitors can reverse mechanical hypersensitivity in models of neuropathic pain and diabetic neuropathy, demonstrating that peripheral targeting of STOML3 represents a viable pain treatment strategy.

5.3 Olfaction

Recent studies have revealed an unexpected role for STOML3 in olfactory transduction. According to PubMed, Agostinelli et al. (2021) showed that STOML3 knockout mice have altered spontaneous firing patterns in OSNs, with lower mean firing frequency and shifted interspike interval distributions [DOI: 10.1523/ENEURO.0565-20.2021] [agostinelli-2021-olfaction-summary]. Furthermore, evoked responses to odorants and IBMX (a phosphodiesterase inhibitor used to mimic odorant stimulation) showed reduced spike numbers and shorter response durations.

According to PubMed, Liang et al. (2023) extended these findings by generating STOML3 knockout mice and performing behavioral tests [DOI: 10.1523/ENEURO.0457-22.2023] [liang-2023-olfaction-behavior-summary]. They found that:

• STOML3 is not required for basic odor detection
• STOML3 knockout mice can detect attractive odors normally
• STOML3 is required for efficient odor discrimination
• STOML3 knockout mice fail to distinguish between familiar and novel odors

This conserved role in olfaction is also present in C. elegans, where the STOML3 homolog mec-2 is required for olfactory behavior. The conservation across species suggests a fundamental role for stomatin-domain proteins in sensory neuron function beyond mechanotransduction [liang-2023-olfaction-behavior-summary].

5.4 Proprioception

Recent work has also implicated STOML3 in proprioception and nerve regeneration. According to PubMed, Haseleu et al. (2025) demonstrated that STOML3 is required for functional plasticity following peripheral nerve regeneration [DOI: 10.1113/EP092428]. In cross-anastomosis experiments where muscle afferents were redirected to innervate skin, wild-type muscle afferents could form functional mechanosensitive receptive fields appropriate for the new target. However, in STOML3 knockout mice, muscle afferents largely failed to form functional mechanosensitive receptive fields despite making anatomically appropriate endings in the skin.

6. Evolutionary Conservation

STOML3 is the mammalian homolog of MEC-2, a protein essential for touch sensation in the nematode Caenorhabditis elegans. According to PubMed, Huang et al. (1995) first identified MEC-2 as a stomatin-like protein required for the function of touch receptor neurons in C. elegans [DOI: 10.1038/378292a0] [huang-1995-mec2-abstract]. MEC-2 mutants are touch-insensitive despite having morphologically normal touch cells.

According to PubMed, Goodman et al. (2002) demonstrated that MEC-2 regulates the MEC-4/MEC-10 DEG/ENaC channels, increasing their activity approximately 40-fold [DOI: 10.1038/4151039a] [goodman-2002-mec2-abstract]. This functional paradigm of stomatin-domain proteins regulating mechanosensitive channels has been conserved from worms to mammals.

The high degree of conservation in the stomatin domain (50% identity between bacterial and human homologs) suggests that stomatin-family proteins have a unifying cellular function that has been preserved throughout evolution [lapatsina-2011-stomatin-review-abstract]. In both C. elegans and mammals:

• Stomatin-domain proteins associate with membranes
• They form oligomeric complexes
• They modulate ion channel activity
• They are essential for mechanosensation and olfaction

7. Clinical and Therapeutic Relevance

7.1 Pain Therapy

The most developed therapeutic application of STOML3 research is in pain treatment. Since STOML3 is required for normal mechanoreceptor sensitivity, inhibiting its function can reduce mechanical hypersensitivity in pathological pain states.

According to PubMed, the OB-1 inhibitor and related compounds that disrupt STOML3 oligomerization can:
- Reversibly reduce mechanically gated currents in sensory neurons
- Silence mechanoreceptors in vivo
- Attenuate fine touch perception in normal mice (reversibly)
- Reverse mechanical allodynia following nerve injury
- Reverse mechanical hypersensitivity in diabetic neuropathy models [wetzel-2016-stoml3-inhibitors-abstract]

The advantage of targeting STOML3 for pain therapy is that it acts peripherally in the skin, potentially avoiding central nervous system side effects. Additionally, the effect is reversible, providing a safety margin.

7.2 Disease Associations

STOML3 gene amplification has been observed in some cancers. According to PubMed, Nagaishi et al. (2012) found that amplification of the STOML3 gene (along with FREM2 and LHFP) is associated with mesenchymal differentiation in gliosarcoma [DOI: 10.1016/j.ajpath.2012.01.027]. STOML3 amplification was found in 22% of mesenchymal tumor areas but not in glial tumor areas.

STOML3 has also been implicated in Bardet-Biedl syndrome (BBS), a ciliopathy characterized by multiple systemic abnormalities. According to PubMed, Tan et al. (2007) found that ablation of BBS1 and BBS4 leads to defective trafficking of STOML3 in sensory neurons, with concomitant defects in peripheral thermosensation and mechanosensation [DOI: 10.1073/pnas.0706618104].

8. Open Questions

Several important questions about STOML3 function remain to be addressed:

1. Structural basis of function: While the stomatin domain is known to be essential for STOML3 function, detailed structural information about STOML3 oligomers and their interaction with Piezo channels is lacking. Cryo-EM or crystallographic studies of STOML3-channel complexes would provide mechanistic insights.

2. Specificity determinants: Why does STOML3, but not other stomatin-domain proteins, sensitize Piezo channels? What molecular features determine the specificity of stomatin-channel interactions?

3. Dual sensory roles: How does STOML3 function in both mechanosensation and olfaction? Does it interact with different channel partners in different sensory neurons, or does it modulate membrane properties in a channel-independent manner?

4. Vesicle trafficking regulation: What signals control STOML3 trafficking between the vesicular pool and the plasma membrane? Is this trafficking physiologically regulated in response to sensory stimuli?

5. Therapeutic development: Can more potent and selective STOML3 inhibitors be developed for clinical pain therapy? What are the potential side effects of chronic STOML3 inhibition on touch sensation and other functions?

6. STOML3 in other tissues: STOML3 expression appears restricted to sensory neurons, but are there additional tissues where it plays functional roles?

7. Isoform-specific functions: In C. elegans, different mec-2 isoforms have distinct functions in mechanosensation versus olfaction. Do human STOML3 splice variants have similar functional specificity?

9. References

1. agostinelli-2021-olfaction: Agostinelli E, Gonzalez-Velandia KY, Hernandez-Clavijo A, Kumar Maurya D, Xerxa E, Lewin GR, Dibattista M, Menini A, Pifferi S. A Role for STOML3 in Olfactory Sensory Transduction. eNeuro. 2021 Mar 12;8(2):ENEURO.0565-20.2021. DOI: 10.1523/ENEURO.0565-20.2021. PMID: 33637538; PMCID: PMC7986538.

2. goodman-2002-mec2: Goodman MB, Ernstrom GG, Chelur DS, O'Hagan R, Yao CA, Chalfie M. MEC-2 regulates C. elegans DEG/ENaC channels needed for mechanosensation. Nature. 2002 Feb 28;415(6875):1039-42. DOI: 10.1038/4151039a. PMID: 11875573.

3. huang-1995-mec2: Huang M, Gu G, Ferguson EL, Chalfie M. A stomatin-like protein necessary for mechanosensation in C. elegans. Nature. 1995 Nov 16;378(6554):292-5. DOI: 10.1038/378292a0. PMID: 7477350.

4. lapatsina-2011-stomatin-review: Lapatsina L, Brand J, Poole K, Daumke O, Lewin GR. Stomatin-domain proteins. Eur J Cell Biol. 2012 Apr;91(4):240-5. DOI: 10.1016/j.ejcb.2011.01.018. PMID: 21501885.

5. lapatsina-2012-asic-vesicle: Lapatsina L, Jira JA, Smith ES, Poole K, Kozlenkov A, Bilbao D, Lewin GR, Heppenstall PA. Regulation of ASIC channels by a stomatin/STOML3 complex located in a mobile vesicle pool in sensory neurons. Open Biol. 2012 Jun;2(6):120096. DOI: 10.1098/rsob.120096. PMID: 22773952; PMCID: PMC3390797.

6. liang-2023-olfaction-behavior: Liang X, Taylor M, Napier-Jameson R, Calovich-Benne C, Norris A. A Conserved Role for Stomatin Domain Genes in Olfactory Behavior. eNeuro. 2023 Mar 22;10(3):ENEURO.0457-22.2023. DOI: 10.1523/ENEURO.0457-22.2023. PMID: 36858824; PMCID: PMC10035767.

7. moshourab-2013-asic-interaction: Moshourab RA, Wetzel C, Martinez-Salgado C, Lewin GR. Stomatin-domain protein interactions with acid-sensing ion channels modulate nociceptor mechanosensitivity. J Physiol. 2013 Nov 15;591(22):5555-74. DOI: 10.1113/jphysiol.2013.261180. PMID: 23959680; PMCID: PMC3853495.

8. poole-2014-matrix-review: Poole K, Moroni M, Lewin GR. Sensory mechanotransduction at membrane-matrix interfaces. Pflugers Arch. 2015 Jan;467(1):121-32. DOI: 10.1007/s00424-014-1563-6. PMID: 24981693; PMCID: PMC4281363.

9. poole-2014-piezo-stoml3: Poole K, Herget R, Lapatsina L, Ngo HD, Lewin GR. Tuning Piezo ion channels to detect molecular-scale movements relevant for fine touch. Nat Commun. 2014 Mar 24;5:3520. DOI: 10.1038/ncomms4520. PMID: 24662763; PMCID: PMC3973071.

10. qi-2015-cholesterol-stoml3: Qi Y, Andolfi L, Frattini F, Mayer F, Lazzarino M, Hu J. Membrane stiffening by STOML3 facilitates mechanosensation in sensory neurons. Nat Commun. 2015 Oct 7;6:8512. DOI: 10.1038/ncomms9512. PMID: 26443885; PMCID: PMC4633829.

11. wetzel-2006-stoml3-touch: Wetzel C, Hu J, Riethmacher D, Benckendorff A, Harder L, Eilers A, Moshourab R, Kozlenkov A, Labuz D, Caspani O, Erdmann B, Machelska H, Heppenstall PA, Lewin GR. A stomatin-domain protein essential for touch sensation in the mouse. Nature. 2006 Dec 14;445(7124):206-9. DOI: 10.1038/nature05394. PMID: 17167420.

12. wetzel-2016-stoml3-inhibitors: Wetzel C, Pifferi S, Picci C, Gök C, Hoffmann D, Bali KK, Lampe A, Lapatsina L, Fleischer R, Smith ESJ, Bégay V, Moroni M, Estebanez L, Kühnemund J, Walcher J, Specker E, Neuenschwander M, von Kries JP, Haucke V, Kuner R, Poulet JFA, Schmoranzer J, Poole K, Lewin GR. Small-molecule inhibition of STOML3 oligomerization reverses pathological mechanical hypersensitivity. Nat Neurosci. 2017 Feb;20(2):209-218. DOI: 10.1038/nn.4454. PMID: 27941788.

Citations

1. agostinelli-2021-olfaction-summary.md
2. goodman-2002-mec2-abstract.md
3. huang-1995-mec2-abstract.md
4. lapatsina-2011-stomatin-review-abstract.md
5. lapatsina-2012-asic-vesicle-fulltext.txt
6. lapatsina-2012-asic-vesicle-summary.md
7. liang-2023-olfaction-behavior-summary.md
8. moshourab-2013-asic-interaction-fulltext.txt
9. moshourab-2013-asic-interaction-summary.md
10. poole-2014-matrix-review-abstract.md
11. poole-2014-piezo-stoml3-fulltext.txt
12. poole-2014-piezo-stoml3-summary.md
13. qi-2015-cholesterol-stoml3-fulltext.txt
14. qi-2015-cholesterol-stoml3-summary.md
15. wetzel-2006-stoml3-touch-abstract.md
16. wetzel-2016-stoml3-inhibitors-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 the target identity and then compiled foundational and recent evidence to define molecular functions, mechanisms, localization, phenotypes, and pharmacology for human STOML3 (Q8TAV4). We prioritized 2014–2024 primary literature where available and integrated authoritative summaries.

Verification of target identity and family/domains
- Target matches: STOML3 (stomatin-like protein 3) is a human stomatin/SPFH/band-7 family protein and the mammalian ortholog of C. elegans MEC-2, consistent with UniProt Q8TAV4. Literature consistently places STOML3 within SPFH/band-7 and in sensory neurons (mechanosensation) (velandia2019expressionandphysiological pages 26-29, kuhnemund2023tuningsensorymechanotransduction pages 28-31).

Key concepts and definitions
- Molecular identity and domain architecture: STOML3 is a stomatin-domain (SPFH/band-7) monotopic membrane protein that forms higher-order oligomers. An N-terminal hydrophobic hairpin anchors the protein to membranes/vesicles; the stomatin domain mediates oligomerization and channel modulation (inferred from stomatin family and directly mapped for STOML3) (poole2014tuningpiezoion pages 1-2, lapatsina2012regulationofasic pages 5-7, velandia2019expressionandphysiological pages 26-29).
- Primary role: STOML3 is a potent physiological regulator of native mechanosensitive currents in sensory neurons. It sensitizes mechanogated channels (notably Piezo1/2), lowering activation thresholds to molecular-scale deflections relevant for fine touch (poole2014tuningpiezoion pages 1-2).
- Concept of a “transducosome”: STOML3 resides in a mobile, Rab11-positive vesicle pool with ASIC subunits and stomatin, consistent with a trafficking/transduction complex supplying components to sensory endings (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4, lapatsina2011molecularmechanismsofa pages 89-92, lapatsina2011molecularmechanismsof pages 89-92).

Function and mechanisms
- Piezo channel modulation: STOML3 lowers the activation threshold of Piezo1 and Piezo2 to ~10 nm displacements and is necessary for high sensitivity of mechanoreceptors. Stoml3 knockout neurons require ~10× larger displacements for activation (Nature Communications, 24 Mar 2014, https://doi.org/10.1038/ncomms4520) (poole2014tuningpiezoion pages 1-2).
- Membrane mechanics and cholesterol: STOML3 binds cholesterol, localizes to cholesterol-rich microdomains, and stiffens local membrane to facilitate force transfer onto mechanogated channels (including Piezo1/2). Cholesterol depletion phenocopies STOML3 deficiency, interdependently reducing mechanosensitivity and altering membrane mechanics (Nature Communications, 7 Oct 2015, https://doi.org/10.1038/ncomms9512) (qi2015membranestiffeningby pages 1-2, qi2015membranestiffeningby pages 4-6).
- Oligomerization as a mechanistic requirement: Higher-order scaffolding/oligomerization via the stomatin domain is required for STOML3’s Piezo-sensitizing activity; oligomerization-disrupting mutations abrogate function and reduce cluster size (poole2014tuningpiezoion pages 1-2, wetzel2017smallmoleculeinhibitionof pages 1-6).
- ASIC interactions and vesicular trafficking: STOML3 directly interacts with multiple ASIC subunits (ASIC1a/1b/2a/2b/3/4) as shown by co-immunoprecipitation and FRET; interactions occur predominantly in a highly mobile vesicular compartment. STOML3-positive vesicles in DRG neurons are Rab11-positive and microtubule-dependent; perturbing vesicle dynamics increases acid-gated currents at the plasma membrane, linking trafficking to ASIC function (Open Biology, Jun 2012, https://doi.org/10.1098/rsob.120096) (lapatsina2012regulationofasic pages 3-4, lapatsina2012regulationofasic pages 4-5, lapatsina2012regulationofasic pages 5-7, lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2011molecularmechanismsofa pages 89-92).
- ELKIN1 coupling: We did not find citable primary evidence in the collected texts demonstrating direct biochemical interaction between human STOML3 and ELKIN1. While emerging work proposes functional relationships between ELKIN1 and known mechanotransduction modulators, our evidence set here does not provide direct STOML3–ELKIN1 data; thus this remains an open point in this report (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11).

Cellular localization
- Lipid rafts/microdomains: STOML3 is detected in cholesterol-rich detergent-resistant fractions consistent with raft association, supporting a role in organizing local membrane mechanics (qi2015membranestiffeningby pages 4-6, qi2015membranestiffeningby pages 1-2).
- Vesicular pool: A significant intracellular pool of STOML3 resides in a mobile, Rab11-positive vesicle population distinct from early endosomes/lysosomes. Vesicles carry STOML3 with stomatin and ASICs; the N-terminal hydrophobic region of STOML3 is necessary for vesicular localization (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4, lapatsina2012regulationofasic pages 5-7).

Organismal and cellular phenotypes
- Mechanosensory deficits upon loss of function: Stoml3 knockout leads to large-scale loss of mechanically sensitive mechanoreceptors (about 35–40% of Aβ/Aδ mechanoreceptors become mechanically “silent”), elevated displacement thresholds in remaining units, and impaired tactile acuity in behavioral assays; neuropathic allodynia is reduced (thesis synthesis, Jan 2023, https://doi.org/10.17169/refubium-31101; and review summary) (kuhnemund2023tuningsensorymechanotransduction pages 28-31, velandia2019expressionandphysiological pages 26-29).
- Biophysical readouts: AFM and mechanical assays show that cholesterol depletion and STOML3 deficiency similarly reduce membrane stiffness and mechanosensitivity; MbCD treatment attenuates tactile allodynia in WT but not Stoml3−/− mice, implying STOML3–cholesterol dependence (Oct 2015, https://doi.org/10.1038/ncomms9512) (qi2015membranestiffeningby pages 1-2, qi2015membranestiffeningby pages 4-6).

Recent developments (emphasis on 2023–2024) and latest research
- 2023 synthesis: Comprehensive analysis emphasizes that STOML3’s self-association and stomatin domain underlie Piezo sensitization and links this to robust in vivo phenotypes (Jan 2023, https://doi.org/10.17169/refubium-31101) (kuhnemund2023tuningsensorymechanotransduction pages 28-31).
- Our collected evidence set did not include citable 2024 primary data directly expanding STOML3 biochemistry; however, the cholesterol–mechanics mechanism and pharmacological oligomerization targeting remain central and translationally active themes based on prior work (qi2015membranestiffeningby pages 1-2, wetzel2017smallmoleculeinhibitionof pages 1-6).

Applications and real-world implementations
- Pharmacological modulation: High-throughput BiFC screening (~35,000 compounds) identified small molecules (OB-1, OB-2) that inhibit STOML3 oligomerization, shrink STOML3 nanoclusters, reduce mechanosensitive currents, silence mechanoreceptors, attenuate normal touch, and reverse mechanical hypersensitivity in neuropathic and diabetic models (Jan 2017, repository DOI https://doi.org/10.17863/cam.7374) (wetzel2017smallmoleculeinhibitionof pages 1-6).
- Membrane targeting as analgesic concept: Acute cholesterol depletion (MbCD) attenuates tactile allodynia in WT but not Stoml3−/− mice, supporting STOML3-dependent membrane mechanics as a druggable axis for pain modulation (Oct 2015, https://doi.org/10.1038/ncomms9512) (qi2015membranestiffeningby pages 1-2, qi2015membranestiffeningby pages 4-6).

Expert opinions and authoritative analysis
- Foundational mechanotransduction perspective: STOML3 is highlighted as an integral scaffold that tunes native mechanosensitive currents, enabling detection of molecular-scale movements, with function mapped to the stomatin domain and higher-order assemblies (Mar 2014, https://doi.org/10.1038/ncomms4520) (poole2014tuningpiezoion pages 1-2).
- Vesicular “transducosome” model: An authoritative Open Biology study proposes a Rab11-positive STOML3/stomatin/ASIC complex in a mobile vesicle pool that regulates availability and function of ASICs, integrating trafficking with transduction (Jun 2012, https://doi.org/10.1098/rsob.120096) (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4).
- 2023 synthesis emphasizes translational potential of targeting STOML3 oligomerization or cholesterol coupling to mitigate mechanical pain hypersensitivity (Jan 2023, https://doi.org/10.17169/refubium-31101) (kuhnemund2023tuningsensorymechanotransduction pages 28-31).

Relevant statistics and quantitative data
- Piezo threshold tuning: STOML3 lowers Piezo1/2 activation thresholds to ~10 nm; Stoml3 knockout raises thresholds ~10-fold (Mar 2014, https://doi.org/10.1038/ncomms4520) (poole2014tuningpiezoion pages 1-2).
- Mechanoreceptor loss: ~35–40% of Aβ/Aδ mechanoreceptors become mechanically silent in Stoml3 knockout; tactile discrimination is impaired (Jan 2023 synthesis) (kuhnemund2023tuningsensorymechanotransduction pages 28-31, velandia2019expressionandphysiological pages 26-29).
- HTS scale: ~35,000-compound screen identified oligomerization blockers (OB-1/OB-2) that reversed neuropathic and diabetic mechanical hypersensitivity (Jan 2017, https://doi.org/10.17863/cam.7374) (wetzel2017smallmoleculeinhibitionof pages 1-6).
- Membrane mechanics: AFM/mechanics show reduced stiffness and mechanosensitivity with either cholesterol depletion or STOML3 loss; MbCD phenocopies STOML3 deficiency and attenuates allodynia in WT (Oct 2015, https://doi.org/10.1038/ncomms9512) (qi2015membranestiffeningby pages 1-2, qi2015membranestiffeningby pages 4-6).

Pathways and interacting channel systems
- Piezo1/2: STOML3 acts as an accessory modulator lowering Piezo channel activation thresholds; effect requires stomatin domain and oligomerization (poole2014tuningpiezoion pages 1-2).
- ASICs: STOML3 co-immunoprecipitates with all tested ASICs and shows strong FRET with ASIC2a/ASIC3 in vesicles; N-terminal hydrophobic insertion is required for vesicle localization and stable interaction (lapatsina2012regulationofasic pages 3-4, lapatsina2012regulationofasic pages 4-5, lapatsina2012regulationofasic pages 5-7).
- Trafficking: STOML3-positive vesicles are Rab11-positive and microtubule-dependent, suggesting a recycling/trafficking role for transduction complexes (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2011molecularmechanismsofa pages 89-92, lapatsina2011molecularmechanismsof pages 89-92).
- ELKIN1: No direct evidence recovered in this set for physical interaction with STOML3; further targeted literature review is needed for this specific coupling (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11).

Subcellular localization summary
- Plasma membrane microdomains: association with cholesterol-rich detergent-resistant fractions (raft-like) (qi2015membranestiffeningby pages 4-6, qi2015membranestiffeningby pages 1-2).
- Intracellular vesicles: Rab11-positive mobile vesicles carrying STOML3, stomatin, and ASICs; vesicle–microtubule uncoupling redirects STOML3 to the plasma membrane, increasing ASIC currents (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4).

Embedded evidence table
| Study (first author, journal) | Year | Model/System | Main finding | Mechanistic focus | Notable quantitative data | URL/DOI |
|---|---:|---|---|---|---|---|
| Poole et al., Nature Communications | 2014 | Mouse DRG neurons; heterologous cells (N2a) | STOML3 lowers activation threshold of Piezo1/2 enabling detection of molecular-scale (~10 nm) displacements; stomatin domain and higher-order scaffolds (oligomerization) are required for this modulatory activity (poole2014tuningpiezoion pages 1-2) | Piezo modulation; oligomerization; stomatin domain | Activation threshold ≈10 nm; Stoml3 KO increases displacement threshold by ~10× (poole2014tuningpiezoion pages 1-2) | https://doi.org/10.1038/ncomms4520 (Mar 2014) |
| Qi et al., Nature Communications | 2015 | Mouse sensory neurons; CHO/N2a cells; AFM membrane measurements | STOML3 binds cholesterol and stiffens local membrane domains to facilitate force transfer and sensitize mechanogated channels (including Piezo1/2); cholesterol depletion phenocopies STOML3 loss (qi2015membranestiffeningby pages 1-2) | Cholesterol/membrane mechanics; localization to lipid rafts | AFM-reported membrane mechanics differences (example values reported in paper comparing WT vs STOML3−/−) and MbCD (5 mM) phenocopies STOML3 loss (qi2015membranestiffeningby pages 1-2) | https://doi.org/10.1038/ncomms9512 (Oct 2015) |
| Wetzel et al., (small-molecule study / refubium) | 2017 | Mouse sensory neurons; in vivo neuropathic/diabetic pain models; HTS BiFC assay | Identified small molecules (OB-1, OB-2) that inhibit STOML3 oligomerization, shrink STOML3 nanoclusters, reduce mechanically-activated currents, silence mechanoreceptors and reverse pathological mechanical hypersensitivity in vivo (wetzel2017smallmoleculeinhibitionof pages 1-6) | Oligomerization; pharmacological modulation; nanocluster regulation | HTS ≈35,000-compound BiFC screen; OB compounds reduced MA currents and reversed hypersensitivity in nerve-injury/diabetic models (wetzel2017smallmoleculeinhibitionof pages 1-6) | https://doi.org/10.17863/cam.7374 (Jan 2017) |
| Velandia (review/expression summary) | 2019 | Review / expression studies (olfactory epithelium, DRG references) | Summarizes stomatin-domain proteins (including STOML3) as regulators of mechanotransduction (Piezo1/2, ASICs), highlighting the roles of the SPFH/stomatin domain, palmitoylation, cholesterol binding and oligomerization for localization and function (velandia2019expressionandphysiological pages 26-29) | Piezo and ASIC modulation; oligomerization; cholesterol/lipid-raft localization | Cites knockout/phenotype literature reporting ~35% of skin mechanoreceptors silent in Stoml3 KO (as summarized from primary studies) (velandia2019expressionandphysiological pages 26-29) | N/A (velandia2019expressionandphysiological pages 26-29) |
| Kühnemund (thesis) | 2023 | Thesis synthesis; mouse models and literature analysis | Integrates evidence that STOML3 self-association and stomatin-domain mediate Piezo sensitization; reports global Stoml3 KO leads to a large fraction (~35–40%) of Aβ/Aδ mechanoreceptors mechanically silent and impaired tactile acuity with reduced mechanical allodynia after nerve injury (kuhnemund2023tuningsensorymechanotransduction pages 28-31) | Oligomerization; localization; phenotypes | ~35–40% mechanoreceptors insensitive in KO; behavioral tactile deficits and reduced post-injury allodynia (kuhnemund2023tuningsensorymechanotransduction pages 28-31) | https://doi.org/10.17169/refubium-31101 (Jan 2023) |

Table: Compact, sourced summary of key experimental findings on human STOML3 (Q8TAV4), showing studies, systems, main findings, mechanistic focuses, quantitative results and DOIs/URLs for quick reference.

Compliance with mandatory verification steps
1) Gene symbol and protein description match: STOML3 (stomatin-like protein 3) aligns with literature for human sensory mechanotransduction (velandia2019expressionandphysiological pages 26-29, kuhnemund2023tuningsensorymechanotransduction pages 28-31).
2) Organism: All cited mammalian work aligns with human/rodent homology; the target is Homo sapiens Q8TAV4, and rodent functional studies are used mechanistically where human data are limited (poole2014tuningpiezoion pages 1-2, qi2015membranestiffeningby pages 1-2).
3) Family/domains: Consistently placed in the band-7/SPFH stomatin family; function requires stomatin domain and oligomerization, consistent with UniProt domain annotations (poole2014tuningpiezoion pages 1-2, lapatsina2012regulationofasic pages 5-7, velandia2019expressionandphysiological pages 26-29).
4) Ambiguity check: No conflicting gene symbol usage detected in our sources (velandia2019expressionandphysiological pages 26-29, kuhnemund2023tuningsensorymechanotransduction pages 28-31).

Key references (URLs and dates)
- Poole et al., Nature Communications, 24 Mar 2014. DOI: 10.1038/ncomms4520; URL: https://doi.org/10.1038/ncomms4520 (poole2014tuningpiezoion pages 1-2).
- Qi et al., Nature Communications, 7 Oct 2015. DOI: 10.1038/ncomms9512; URL: https://doi.org/10.1038/ncomms9512 (qi2015membranestiffeningby pages 1-2, qi2015membranestiffeningby pages 4-6).
- Lapatsina et al., Open Biology, Jun 2012. DOI: 10.1098/rsob.120096; URL: https://doi.org/10.1098/rsob.120096 (lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4, lapatsina2012regulationofasic pages 4-5, lapatsina2012regulationofasic pages 5-7).
- Wetzel et al., small-molecule inhibition study, Jan 2017. DOI/URL: https://doi.org/10.17863/cam.7374 (wetzel2017smallmoleculeinhibitionof pages 1-6).
- Kühnemund, Thesis synthesis, Jan 2023. DOI/URL: https://doi.org/10.17169/refubium-31101 (kuhnemund2023tuningsensorymechanotransduction pages 28-31).
- Additional review summary of stomatin-domain proteins and STOML3 (no URL in excerpt) (velandia2019expressionandphysiological pages 26-29).

Conclusions
Human STOML3 (Q8TAV4) is a stomatin/SPFH-domain oligomeric membrane protein that tunes the sensitivity of mechanogated ion channels, especially Piezo1/2, by organizing cholesterol-rich microdomains and stiffening the membrane to facilitate force transfer. It also forms vesicular complexes with stomatin and ASICs in a Rab11-positive, microtubule-dependent recycling pool that likely traffics transduction components. Loss of STOML3 impairs mechanosensation at cellular and behavioral levels, while pharmacological disruption of STOML3 oligomerization or its cholesterol coupling can attenuate pathological mechanical hypersensitivity, supporting STOML3 as a translational target in pain. Evidence for direct ELKIN1 coupling was not found in our collected citable set and remains to be resolved by further targeted studies (poole2014tuningpiezoion pages 1-2, qi2015membranestiffeningby pages 1-2, lapatsina2012regulationofasic pages 1-2, lapatsina2012regulationofasic pages 10-11, lapatsina2012regulationofasic pages 3-4, wetzel2017smallmoleculeinhibitionof pages 1-6, kuhnemund2023tuningsensorymechanotransduction pages 28-31, qi2015membranestiffeningby pages 4-6, lapatsina2012regulationofasic pages 4-5, lapatsina2012regulationofasic pages 5-7, lapatsina2011molecularmechanismsofa pages 89-92, lapatsina2011molecularmechanismsof pages 89-92, velandia2019expressionandphysiological pages 26-29).

References

1. (velandia2019expressionandphysiological pages 26-29): KY Gonzalez Velandia. Expression and physiological role of stomatin-domain proteins in the olfactory epithelium. Unknown journal, 2019.

2. (kuhnemund2023tuningsensorymechanotransduction pages 28-31): Johannes Kühnemund. Tuning sensory mechanotransduction to wind down neuropathic pain. Text, Jan 2023. URL: https://doi.org/10.17169/refubium-31101, doi:10.17169/refubium-31101. This article has 0 citations and is from a peer-reviewed journal.

3. (poole2014tuningpiezoion pages 1-2): Kate Poole, Regina Herget, Liudmila Lapatsina, Ha-Duong Ngo, and Gary R. Lewin. Tuning piezo ion channels to detect molecular-scale movements relevant for fine touch. Nature Communications, Mar 2014. URL: https://doi.org/10.1038/ncomms4520, doi:10.1038/ncomms4520. This article has 336 citations and is from a highest quality peer-reviewed journal.

4. (lapatsina2012regulationofasic pages 5-7): Liudmila Lapatsina, Julia A. Jira, Ewan St. J. Smith, Kate Poole, Alexey Kozlenkov, Daniel Bilbao, Gary R. Lewin, and Paul A. Heppenstall. Regulation of asic channels by a stomatin/stoml3 complex located in a mobile vesicle pool in sensory neurons. Open Biology, 2:120096, Jun 2012. URL: https://doi.org/10.1098/rsob.120096, doi:10.1098/rsob.120096. This article has 50 citations and is from a peer-reviewed journal.

5. (lapatsina2012regulationofasic pages 1-2): Liudmila Lapatsina, Julia A. Jira, Ewan St. J. Smith, Kate Poole, Alexey Kozlenkov, Daniel Bilbao, Gary R. Lewin, and Paul A. Heppenstall. Regulation of asic channels by a stomatin/stoml3 complex located in a mobile vesicle pool in sensory neurons. Open Biology, 2:120096, Jun 2012. URL: https://doi.org/10.1098/rsob.120096, doi:10.1098/rsob.120096. This article has 50 citations and is from a peer-reviewed journal.

6. (lapatsina2012regulationofasic pages 10-11): Liudmila Lapatsina, Julia A. Jira, Ewan St. J. Smith, Kate Poole, Alexey Kozlenkov, Daniel Bilbao, Gary R. Lewin, and Paul A. Heppenstall. Regulation of asic channels by a stomatin/stoml3 complex located in a mobile vesicle pool in sensory neurons. Open Biology, 2:120096, Jun 2012. URL: https://doi.org/10.1098/rsob.120096, doi:10.1098/rsob.120096. This article has 50 citations and is from a peer-reviewed journal.

7. (lapatsina2012regulationofasic pages 3-4): Liudmila Lapatsina, Julia A. Jira, Ewan St. J. Smith, Kate Poole, Alexey Kozlenkov, Daniel Bilbao, Gary R. Lewin, and Paul A. Heppenstall. Regulation of asic channels by a stomatin/stoml3 complex located in a mobile vesicle pool in sensory neurons. Open Biology, 2:120096, Jun 2012. URL: https://doi.org/10.1098/rsob.120096, doi:10.1098/rsob.120096. This article has 50 citations and is from a peer-reviewed journal.

8. (lapatsina2011molecularmechanismsofa pages 89-92): L Lapatsina. Molecular mechanisms of mechanotransduction: functional analysis of the role of stoml3. Unknown journal, 2011.

9. (lapatsina2011molecularmechanismsof pages 89-92): L Lapatsina. Molecular mechanisms of mechanotransduction: functional analysis of the role of stoml3. Unknown journal, 2011.

10. (qi2015membranestiffeningby pages 1-2): Yanmei Qi, Laura Andolfi, Flavia Frattini, Florian Mayer, Marco Lazzarino, and Jing Hu. Membrane stiffening by stoml3 facilitates mechanosensation in sensory neurons. Nature Communications, Oct 2015. URL: https://doi.org/10.1038/ncomms9512, doi:10.1038/ncomms9512. This article has 198 citations and is from a highest quality peer-reviewed journal.

11. (qi2015membranestiffeningby pages 4-6): Yanmei Qi, Laura Andolfi, Flavia Frattini, Florian Mayer, Marco Lazzarino, and Jing Hu. Membrane stiffening by stoml3 facilitates mechanosensation in sensory neurons. Nature Communications, Oct 2015. URL: https://doi.org/10.1038/ncomms9512, doi:10.1038/ncomms9512. This article has 198 citations and is from a highest quality peer-reviewed journal.

12. (wetzel2017smallmoleculeinhibitionof pages 1-6): Christiane Wetzel, S. Pifferi, C. Picci, Caglar Gök, Diana Hoffmann, K. Bali, André Lampe, L. Lapatsina, Raluca Fleischer, E. Smith, V. Bégay, M. Moroni, L. Estebanez, Johannes Kühnemund, Jan Walcher, E. Specker, M. Neuenschwander, J. V. von Kries, V. Haucke, R. Kuner, J. Poulet, J. Schmoranzer, K. Poole, and G. Lewin. Small-molecule inhibition of stoml3 oligomerization reverses pathological mechanical hypersensitivity. JournalArticle, Jan 2017. URL: https://doi.org/10.17863/cam.7374, doi:10.17863/cam.7374. This article has 98 citations.

13. (lapatsina2012regulationofasic pages 4-5): Liudmila Lapatsina, Julia A. Jira, Ewan St. J. Smith, Kate Poole, Alexey Kozlenkov, Daniel Bilbao, Gary R. Lewin, and Paul A. Heppenstall. Regulation of asic channels by a stomatin/stoml3 complex located in a mobile vesicle pool in sensory neurons. Open Biology, 2:120096, Jun 2012. URL: https://doi.org/10.1098/rsob.120096, doi:10.1098/rsob.120096. This article has 50 citations and is from a peer-reviewed journal.

Citations

1. poole2014tuningpiezoion pages 1-2
2. kuhnemund2023tuningsensorymechanotransduction pages 28-31
3. wetzel2017smallmoleculeinhibitionof pages 1-6
4. qi2015membranestiffeningby pages 1-2
5. velandia2019expressionandphysiological pages 26-29
6. lapatsina2012regulationofasic pages 5-7
7. lapatsina2012regulationofasic pages 1-2
8. lapatsina2012regulationofasic pages 10-11
9. lapatsina2012regulationofasic pages 3-4
10. lapatsina2011molecularmechanismsofa pages 89-92
11. lapatsina2011molecularmechanismsof pages 89-92
12. qi2015membranestiffeningby pages 4-6
13. lapatsina2012regulationofasic pages 4-5
14. https://doi.org/10.1038/ncomms4520
15. https://doi.org/10.1038/ncomms9512
16. https://doi.org/10.1098/rsob.120096
17. https://doi.org/10.17169/refubium-31101;
18. https://doi.org/10.17169/refubium-31101
19. https://doi.org/10.17863/cam.7374
20. https://doi.org/10.17169/refubium-31101,
21. https://doi.org/10.1038/ncomms4520,
22. https://doi.org/10.1098/rsob.120096,
23. https://doi.org/10.1038/ncomms9512,
24. https://doi.org/10.17863/cam.7374,

STOML3 (Stomatin-Like Protein 3) – Overview and Key Features

Stomatin-like protein 3 (STOML3), also known as SLP-3, is an integral membrane protein of the stomatin family that plays a key role in sensory mechanotransduction (pmc.ncbi.nlm.nih.gov). The human STOML3 gene encodes a protein of ~291 amino acids (Uniprot ID Q8TAV4) characterized by a conserved stomatin (SPFH) domain. This domain is shared with other “band-7” family proteins (stomatin, flotillin, prohibitin, etc.) and mediates membrane association and oligomerization. STOML3 contains a single transmembrane region near its N-terminus and predominantly localizes to cell membranes – especially within cholesterol-rich membrane rafts (pmc.ncbi.nlm.nih.gov). Notably, STOML3 was identified as the mammalian homologue of C. elegans MEC-2 (a protein required for touch sensation in worms) (scholars.mssm.edu), and it was the first molecule shown to be essential for touch sensation in mammals (scholars.mssm.edu).

Tissue Distribution: In humans, STOML3 is selectively expressed in certain tissues and cell types. It is highly expressed in sensory neurons of the dorsal root ganglia (DRG) and trigeminal ganglia – the cells that detect touch and pain stimuli (scholars.mssm.edu). Immunolocalization studies show STOML3 is concentrated at the peripheral nerve endings of these neurons where mechanical stimuli are detected (scholars.mssm.edu). In the mouse inner ear, STOML3 is found in mechanosensory nerve fibers (though it is not the mechanotransducer of hair cells themselves) and in other mechanosensitive tissues (scholars.mssm.edu). Intriguingly, STOML3 is also present in ciliated cells beyond the nervous system. For example, in the olfactory epithelium STOML3 localizes to the cilia of olfactory sensory neurons (OSNs) (pmc.ncbi.nlm.nih.gov), and Human Protein Atlas data indicate STOML3 enrichment in the motile cilia of respiratory and reproductive epithelia (e.g. fallopian tube) (www.proteinatlas.org) (www.proteinatlas.org). This suggests a broader role for STOML3 in ciliary membrane domains. Consistently, subcellular studies place STOML3 at the plasma membrane (especially within lipid raft microdomains) and in some intracellular vesicles that traffic to the membrane (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Structural and Biochemical Features: Like other stomatin-family proteins, STOML3 forms oligomers in the membrane, which is important for its function (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The protein’s SPFH/stomatin domain enables it to interact with membrane lipids and partner proteins. A notable biochemical property of STOML3 is its ability to bind cholesterol via a conserved motif in its N-terminus (pmc.ncbi.nlm.nih.gov). This cholesterol-binding capacity allows STOML3 to organize specialized membrane microdomains – effectively stiffening the local membrane where mechanotransducer proteins reside (pmc.ncbi.nlm.nih.gov). Qi et al. (2015) showed that STOML3’s association with cholesterol has a direct impact on membrane mechanics and mechanosensitivity: STOML3 partitions into lipid rafts and by recruiting cholesterol it locally increases membrane stiffness, thereby facilitating efficient transfer of force to mechanosensitive ion channels (pmc.ncbi.nlm.nih.gov). Mutational analysis supports this mechanism – for instance, a point mutation in STOML3 (P40S) that disrupts cholesterol binding abolishes STOML3’s ability to sensitize mechanogated ion channels (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Together, these features define STOML3 as a membrane scaffolding or adapter protein that organizes mechanotransduction complexes.

Mechanosensory Function and Ion Channel Modulation

Primary Role in Mechanotransduction: The principal function of STOML3 is to enable and modulate mechanotransduction – the conversion of mechanical stimuli into electrochemical signals in sensory cells. STOML3 is not an enzyme or ion channel itself; rather, it serves as a critical accessory subunit of mechanosensory protein complexes (scholars.mssm.edu). In touch receptors, STOML3 is required for the normal function of mechanosensitive ion channels that respond to pressure or touch. Notably, mice lacking STOML3 have profound deficits in touch sensation: approximately 35% of cutaneous mechanoreceptive neurons completely lose their response to mechanical stimuli in STOML3 mutants (scholars.mssm.edu). Electrophysiological recordings show that many mechanogated ion currents in sensory neurons are abolished without STOML3 (scholars.mssm.edu). Accordingly, tactile-driven behaviors are impaired in Stoml3-knockout mice – for example, mutant mice show reduced responses to gentle touch and even a loss of touch-evoked pain (tactile allodynia) after nerve injury (scholars.mssm.edu). These findings established STOML3 as an indispensable component of the mechanotransducer apparatus in a subset of touch receptors (scholars.mssm.edu).

Ion Channel Interactions: At the molecular level, STOML3 interacts with multiple ion channels involved in mechanosensation: most prominently the Piezo family of stretch-activated cation channels, and acid-sensing ion channels (ASICs) in nociceptive neurons. STOML3 co-localizes with Piezo1 and Piezo2 channels in mechanosensitive cells and enhances their sensitivity to mechanical force (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In heterologous cell experiments, co-expression of STOML3 lowers the threshold for Piezo1/2 activation and increases the mechanically evoked currents (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This effect depends on STOML3’s cholesterol-binding function – cholesterol depletion or mutating STOML3’s cholesterol-interaction site (P40S) prevents STOML3 from potentiating Piezo currents (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Mechanistically, STOML3 is thought to facilitate force transfer to Piezo channels by creating a stiffer lipid microenvironment around the channel, effectively tuning the channel’s gating kinetics (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In vivo, deleting STOML3 or acutely disrupting its cholesterol associations both cause a similar reduction in mechanosensory current amplitude, supporting this model (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Consistent with its role, in vitro studies found STOML3 enriched at the site of Piezo2-containing mechanotransducer complexes in touch receptors (pmc.ncbi.nlm.nih.gov), and in vivo cholesterol depletion blunts touch sensitivity in wild-type mice but not in Stoml3-knockout mice (pmc.ncbi.nlm.nih.gov) (implying STOML3 is required for cholesterol-dependent modulation of touch).

Beyond Piezo channels, STOML3 (and its relative stomatin) also physically associate with ASIC channels in sensory neurons (pmc.ncbi.nlm.nih.gov). ASICs are proton-gated cation channels implicated in certain mechanosensory and pain pathways. STOML3 was shown to bind ASIC subunits and alter their gating properties: it can suppress the peak amplitude of ASIC currents and slow their inactivation kinetics in recombinant systems (pmc.ncbi.nlm.nih.gov). All three proteins – STOML3, stomatin (STOM), and ASIC – can form complexes, and genetically removing these components leads to overlapping deficits in mechanonociception (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). For example, knockout of Stoml3 or Asic3 individually each causes partial loss of certain pain-sensing mechanoreceptors, but combined Asic3/Stoml3 double-knockout produces an exacerbated loss of mechanosensitivity in Aδ-fiber nociceptors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This synergistic phenotype indicates STOML3 and ASIC3 normally work in concert to tune mechanosensitivity in those high-threshold mechanonociceptors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Similarly, STOML3 and stomatin can compensate for each other to some extent, as double-knockouts of Stoml3 and Stom reveal greater deficits than single mutants in certain fibers (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In summary, STOML3 interacts with multiple ion channels (Piezo1/2, ASIC2/3, etc.) and modulates their activity, serving as a scaffold that organizes these channels in membrane microdomains and fine-tunes their gating in response to mechanical stimuli (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

Oligomerization and Mechanotransducer Complexes: An important aspect of STOML3’s function is its ability to form higher-order oligomers. STOML3 molecules can self-associate (likely as dimers and larger oligomeric assemblies), and this oligomerization is functionally significant (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). The STOML3 oligomers may cluster around mechanosensitive ion channels in the membrane, creating a multimeric complex that optimizes force transmission. Disrupting STOML3 oligomerization has been shown to impair mechanotransduction. For instance, a small-molecule inhibitor called OB-1 prevents STOML3 from oligomerizing and thereby reduces its functional interaction with mechanogated channels (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In sensory neuron cultures, OB-1 treatment significantly dampens mechanically activated currents (pmc.ncbi.nlm.nih.gov). Likewise, in ex vivo nerve preparations, OB-1 “silences” many mechanoreceptor fibers – Aβ and Aδ touch fibers lose responsiveness when STOML3 oligomers are blocked (pmc.ncbi.nlm.nih.gov). These findings support a model where a STOML3 oligomeric lattice around ion channels is needed to effectively gate the channel in response to membrane stretch (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Without the oligomeric scaffold, mechanotransducer channels either fail to open or require much stronger force to activate.

Biological Roles and Pathways

Touch and Mechanosensation: STOML3 is best known for its role in the sense of touch. It is expressed in a subset of cutaneous mechanoreceptors – the sensory neurons innervating the skin that detect light touch, pressure, and vibration. These include low-threshold mechanoreceptors associated with gentle touch (like Merkel cell–neurite complexes and hair follicle receptors) as well as some mechanosensitive nociceptors for painful pressure (scholars.mssm.edu) (pmc.ncbi.nlm.nih.gov). In normal animals, mechanical stimuli at the skin surface activate mechanotransducer channels in the nerve endings, leading to depolarization and action potentials. STOML3 is a critical component of this transduction machinery: in Stoml3-mutant mice, many skin mechanoreceptors cannot convert mechanical stimuli into neural signals (scholars.mssm.edu). Approximately one-third of myelinated mechanoreceptive fibers in the skin have no mechanosensitive response without STOML3 (scholars.mssm.edu), indicating those receptors’ transducer channels absolutely require STOML3. Consequently, STOML3-deficient mice show behavioral deficits in touch perception, such as reduced responsiveness to light touch and impaired tactile acuity (scholars.mssm.edu). Even certain forms of mechanically evoked pain (like pain from gentle touch after nerve injury) are absent in these mutants, suggesting those pathological touch-pain signals (tactile allodynia) depend on STOML3-mediated mechanotransduction (scholars.mssm.edu). In contrast, other sensory modalities (e.g. responses to heat or noxious chemical pain) are largely intact in Stoml3 knockouts, underscoring that STOML3 is selectively required for mechanosensory pathways (scholars.mssm.edu).

It is noteworthy that not all sensory fibers rely equally on STOML3. Research has uncovered fiber-type specificity in STOML3’s contribution. Myelinated low-threshold mechanoreceptors (Aβ fibers) and certain thin myelinated nociceptors (Aδ fibers) critically depend on STOML3, whereas many unmyelinated C-fiber nociceptors do not (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Initial studies found C-fiber mechanonociceptors retained normal mechanosensitivity in Stoml3-knockout mice (pmc.ncbi.nlm.nih.gov), even though A-fiber mechanoreceptors were severely affected. Recent work in a bone pain model similarly showed that blocking STOML3 function with OB-1 strongly reduced the firing of Aδ mechanosensitive afferents, without significantly altering C-fiber responses to mechanical stimuli (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These observations suggest that STOML3 is an essential transduction component for fast-conducting mechanoreceptors (responsible for acute touch and pressure detection), while C-fiber mediated mechanosensation (such as certain dull pressure pain or mechanical inflammation responses) may use alternative molecular mechanisms that do not involve STOML3 (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This fiber-specific role is an active area of research, as it hints that different mechanotransduction complexes operate in different classes of sensory neurons.

Proprioception: Beyond cutaneous touch, STOML3 has been implicated in proprioceptive mechanotransduction – the sensing of body position and muscle force. Proprioceptive neurons (muscle spindle and Golgi tendon organ afferents) are also mechanosensors, and they express many of the same transduction molecules as cutaneous touch receptors. A recent study by Haseleu et al. (2025) demonstrated that STOML3 is required for the functional plasticity of proprioceptors after nerve injury (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). In an experimental nerve cross-reinnervation, muscle proprioceptive neurons were surgically redirected to innervate skin (a context where they normally would form touch receptors). In wild-type mice, the redirected muscle afferents were able to form functioning skin mechanoreceptors and responded to cutaneous touch, effectively adopting a cutaneous mechanosensory phenotype (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). However, in Stoml3-knockout mice, these proprioceptive neurons failed to acquire mechanosensitivity in the skin – even though they established anatomically normal nerve endings, they could not transduce mechanical stimuli (pubmed.ncbi.nlm.nih.gov). The STOML3-deficient muscle afferents remained largely silent to mechanical stimulation, indicating that STOML3 is necessary for them to become functional mechanoreceptors (pubmed.ncbi.nlm.nih.gov). Interestingly, the lack of mechanotransduction did not prevent those neurons from establishing correct central synaptic connections, suggesting STOML3’s role is specifically in the transduction machinery rather than guiding innervation (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov). This finding highlights STOML3 as a fundamental “molecular switch” for mechanosensitivity – sensory neurons require STOML3 to assemble or operate the mechanotransducer complexes that make them responsive to physical force. Without STOML3, even neurons capable of morphologically adapting to a new target cannot gain mechanosensory function, underscoring how crucial STOML3 is for mechanotransduction across different sensory modalities.

Olfactory Sensory Modulation: While STOML3 is primarily studied in touch and proprioception, emerging evidence suggests it also contributes to olfactory sensory function. STOML3 is robustly expressed in the cilia of olfactory sensory neurons, the site of odorant signal transduction (pmc.ncbi.nlm.nih.gov). These olfactory cilia contain the molecular machinery (odorant receptors, G-proteins, cyclic nucleotide-gated ion channels, etc.) that initiates smell signals. The presence of STOML3 in this compartment raised the question of whether it influences olfactory signal transduction. In 2021, Agostinelli et al. investigated olfaction in Stoml3 knockout mice and found that olfactory neurons require STOML3 for normal sensory encoding (pmc.ncbi.nlm.nih.gov) (www.pharm.ox.ac.uk). Single-cell recordings from olfactory neurons showed that Stoml3 KO cells have abnormally low spontaneous firing activity and altered inter-spike interval patterns compared to wild-type (pmc.ncbi.nlm.nih.gov) (www.pharm.ox.ac.uk). Moreover, when stimulated with odorants, STOML3-deficient OSNs produced significantly fewer action potentials and shorter-lasting responses than normal neurons (www.pharm.ox.ac.uk) (www.pharm.ox.ac.uk). Importantly, the primary odor transduction current (receptor potential) appeared to be attenuated in the knockouts, rather than there being a general inability to fire action potentials (www.pharm.ox.ac.uk) (www.pharm.ox.ac.uk). This points to a deficit at the transduction level – consistent with STOML3 acting near the sensory transduction complex in olfactory cilia. The effect of STOML3 in OSNs seems to be a modulatory one: it helps set the baseline excitability (spontaneous firing rate) and allows OSNs to sustain and broaden their firing responses to odor stimuli (www.pharm.ox.ac.uk). In practical terms, STOML3 enables olfactory neurons to encode odor information with a greater dynamic range of spike frequency and duration (www.pharm.ox.ac.uk). These findings introduce STOML3 as a novel player in olfactory signal transduction, suggesting that even in non-mechanosensory systems, STOML3’s scaffolding role in ciliary membranes can influence sensory signaling. It is an open question whether STOML3 modulates the gating of specific ciliary ion channels (such as the cyclic-nucleotide gated channel or Ca²⁺-activated Cl⁻ channel in OSNs) or perhaps affects the mechanical environment of the cilium during the rapid fluid movements of sniffing. Nonetheless, the physiological role of STOML3 in olfaction is now evident: it is required for maintaining normal sensitivity and response patterns in smell receptors (www.pharm.ox.ac.uk).

Recent Advances and Therapeutic Implications

Given STOML3’s central role in mechanosensory function, it has attracted interest as a therapeutic target, particularly for treating neuropathic pain and other disorders of touch sensitivity. Mechanical pain (such as allodynia and hyperalgesia) is a major feature of many chronic pain conditions, and research suggests that aberrant STOML3-dependent mechanotransduction contributes to these symptoms (pmc.ncbi.nlm.nih.gov). For example, in models of diabetic neuropathy and nerve injury, animals exhibit exaggerated mechanosensitivity (touch becomes painful), but pharmacologically blocking STOML3 function can reverse this mechanical hypersensitivity (pmc.ncbi.nlm.nih.gov). Small-molecule inhibitors of STOML3 have been developed to probe this effect. Notably, a compound named OB-1 was identified in a screen of ~35,000 molecules for inhibitors of mechanotransduction (pmc.ncbi.nlm.nih.gov). OB-1 binds to STOML3 and selectively disrupts STOML3 oligomerization (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). By doing so, it functionally “knocks down” STOML3’s ability to support mechanogated ion channels. In vitro, OB-1 markedly reduces the amplitude of mechanically activated currents in DRG neurons (pmc.ncbi.nlm.nih.gov). In ex vivo nerve recordings, OB-1 application silences the firing of touch-sensitive Aβ and Aδ fibers without affecting unrelated electrical excitability (pmc.ncbi.nlm.nih.gov). Most importantly, OB-1 has shown efficacy in vivo: in animal models of pain, OB-1 alleviates mechanical pain behaviors (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). For instance, in a rat model of inflammatory bone pain, local injection of OB-1 led to increased weight-bearing on the injured limb, indicating pain relief due to reduced noxious mechanical input from bone afferents (pmc.ncbi.nlm.nih.gov). Similarly, in mouse models of neuropathy (diabetic neuropathy and chronic nerve constriction injury), systemic OB-1 treatment reversed mechanical allodynia, bringing pain sensitivity back toward normal levels (pmc.ncbi.nlm.nih.gov). These outcomes demonstrate that targeting STOML3-mediated mechanotransduction can modulate touch and pain perception in vivo, validating STOML3 as a promising analgesic target.

Importantly, STOML3 inhibitors achieve pain relief by modulating the mechanosensory apparatus upstream of nerve firing, rather than by blocking neurotransmission or general excitability. This might offer a selective way to dampen pathological touch and pain (for example, reducing painful tactile sensations) without completely numbing all sensation. Indeed, because C-fiber pain pathways (e.g. for heat pain or certain internal pains) do not rely on STOML3 (pmc.ncbi.nlm.nih.gov), a STOML3 blocker might specifically reduce mechanical pain (like pressure-induced pain or allodynia) while sparing other sensory modalities. The specificity of OB-1’s action is also indicated by its lack of direct effect on unrelated ion channels: for example, OB-1 does not block proton-gated ASIC currents directly and does not mimic general anesthetics (patents.google.com). Its action is confined to interfering with the STOML3 scaffold, which in turn silences mechanotransduction at the sensory nerve endings (pmc.ncbi.nlm.nih.gov). This mode of action has led researchers to propose STOML3-based strategies as novel treatments for conditions involving abnormal touch or pain sensitivity (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). A 2015 study suggested that disrupting the STOML3–cholesterol interaction could be one such strategy, effectively “softening” the membrane microdomains and raising the threshold for mechanoreceptor activation as a way to reduce pain (pmc.ncbi.nlm.nih.gov). The subsequent development of oligomerization inhibitors like OB-1 aligns with this idea by functionally removing the STOML3 scaffold and thus desensitizing mechanoreceptors. As of 2023–2024, patent applications and preclinical research have been detailing STOML3 inhibitors for pain therapy (pmc.ncbi.nlm.nih.gov) (patents.google.com), and ongoing studies continue to explore STOML3’s role in touch disorders (e.g. tactile allodynia in neuropathic pain, or even hypersensitivity in autism or other conditions affecting touch perception).

In summary, STOML3 is a pivotal mechanotransduction protein with a well-established role in touch, pressure, and pain sensation. It acts as a membrane-bound adapter that links mechanical forces to ion channel activation, by shaping the lipid–protein microenvironment of mechanosensory complexes. Its presence is required at the cellular level (nerve endings and sensory cilia) for normal mechanosensitive currents, and at the organism level for normal tactile behaviors. Recent research (2021–2024) has expanded our understanding of STOML3’s function – revealing its contributions to olfactory signaling and to sensory neuron plasticity – and has highlighted its potential as a target for modulating touch and pain in disease. Going forward, the continued study of STOML3 offers both fundamental insights into how cells sense mechanical stimuli and a pathway to therapeutic innovations for pain and sensory disorders (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).

References:

• Wetzel, C. et al. (2007). Nature 445(7124): 206–209. DOI: 10.1038/nature05394. PMID: 17230193. (Demonstrated that STOML3/SLP3 is essential for touch sensation in mice; ~35% of mechanoreceptors lost function in Stoml3 mutants and mechanosensitive currents were abolished without SLP3 (scholars.mssm.edu).)
• Moshourab, R.A. et al. (2013). J. Physiol. 591(22): 5555–5574. DOI: 10.1113/jphysiol.2013.261180. PMID: 23959680. (Showed that stomatin-family proteins modulate mechanonociceptor sensitivity via interactions with ASIC channels; STOML3 interacts with ASIC2/3 and deletion of Stoml3 exacerbates mechanosensory deficits in combination with ASIC knockouts (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov).)
• Qi, Y. et al. (2015). Nat. Commun. 6: 8512. DOI: 10.1038/ncomms9512. PMID: 26443885. (Elucidated the mechanism of STOML3 in mechanotransduction: STOML3 binds cholesterol in lipid rafts to stiffen membranes and sensitize Piezo1/2 channels to force (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Demonstrated that a cholesterol-binding mutant STOML3 fails to potentiate Piezo currents (pmc.ncbi.nlm.nih.gov) and that cholesterol depletion mimics the loss of STOML3 (pmc.ncbi.nlm.nih.gov).)
• Agostinelli, E. et al. (2021). eNeuro 8(2): ENEURO.0565-20.2021. DOI: 10.1523/ENEURO.0565-20.2021. PMID: 33637538. (Reported a novel role for STOML3 in olfactory sensory neurons. STOML3 localizes to olfactory cilia and is required for normal odor-evoked signaling; Stoml3–KO OSNs showed reduced spontaneous firing and fewer, shorter spikes in response to odors (pmc.ncbi.nlm.nih.gov) (www.pharm.ox.ac.uk).)
• Morgan, M. et al. (2023). Mol. Pain 19: 17448069231222407. DOI: 10.1177/17448069231222407. PMID: 38073226. (Examined STOML3’s role in an acute bone pain model. Using the STOML3 oligomerization inhibitor OB-1, they found that STOML3 modulates Aδ-fiber responses to noxious mechanical stimuli, but not C-fiber responses (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). OB-1 reduced mechanical pain behavior in rats, suggesting therapeutic potential (pmc.ncbi.nlm.nih.gov).)
• Haseleu, J. et al. (2025). Exp. Physiol. 110(10): 1473–1491. DOI: 10.1113/EP092428. PMID: 40163784. (Demonstrated that STOML3 is required for proprioceptive neurons to acquire mechanosensitivity after nerve regeneration. In Stoml3-mutant mice, muscle afferents re-routed to skin failed to form functional mechanoreceptors despite normal innervation, underscoring STOML3’s necessity for mechanotransducer function (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov).)
• Additional Data Sources: Human Protein Atlas (v22, 2023) – STOML3 protein is enriched in multiciliated cells (e.g. fallopian tube, respiratory epithelium) and localizes to the ciliary axoneme (www.proteinatlas.org) (www.proteinatlas.org). UniprotKB (Q8TAV4) – STOML3 is a 291-aa membrane protein with two known isoforms and predicted membrane localization.

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