{"gene":"HMMR","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1993,"finding":"Two discrete hyaluronan-binding domains were identified in RHAMM near the carboxyl terminus (amino acids 400-434), each containing clusters of basic amino acids. Synthetic peptides mimicking these domains directly bind HA-Sepharose and inhibit HA-RHAMM interactions; deletion of these domains abolishes HA binding.","method":"Recombinant GST-fusion protein truncations, HA-Sepharose binding assays, synthetic peptide competition, transblot assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro with mutagenesis and multiple orthogonal binding assays","pmids":["7682552"],"is_preprint":false},{"year":1994,"finding":"A common HA-binding motif B(X7)B (two basic amino acids flanking a seven amino acid stretch) is required for HA binding in RHAMM, CD44, and link protein. Mutation of K423 and R431 in RHAMM domain II abolished HA binding; mutation of all B(X7)B basic residues to histidine eliminated binding. Chimeric proteins containing B(X7)B motifs from CD44 or link protein acquired HA-binding activity.","method":"Site-directed mutagenesis of recombinant RHAMM polypeptides, HA-Sepharose binding, transblot assays, chimeric protein construction","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with site-directed mutagenesis and multiple binding assays; foundational mechanistic study","pmids":["7508860"],"is_preprint":false},{"year":1994,"finding":"RHAMM also contains heparin-binding sites within the same 35 amino acid C-terminal region as the HA-binding domains. Heparin at physiological concentrations stimulates cell locomotion in a RHAMM-dependent manner (blocked by anti-RHAMM antibodies), while lower concentrations inhibit HA-induced locomotion independently of RHAMM.","method":"Ligand blotting with biotin-labeled heparin, GST-RHAMM fusion protein binding, HP-Sepharose affinity, anti-RHAMM antibody blocking of cell locomotion","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple binding assays plus functional cell locomotion readout, single lab","pmids":["7534313"],"is_preprint":false},{"year":1995,"finding":"Overexpression of RHAMM in fibroblasts is transforming and causes lung metastases. RHAMM acts downstream of H-ras: dominant-suppressor RHAMM mutants revert ras-transformed fibrosarcomas to nontumorigenic, and antisense RHAMM renders fibroblasts resistant to ras transformation. Loss of functional RHAMM ablates focal adhesion kinase phosphorylation changes and prevents focal adhesion turnover in response to hyaluronan.","method":"Stable transfection (overexpression and antisense), dominant-negative mutant expression, in vivo tumorigenesis and metastasis assays, FAK phosphorylation western blot, focal adhesion assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis (ras pathway), loss-of-function and gain-of-function with defined molecular and cellular readouts; high-citation foundational paper","pmids":["7541721"],"is_preprint":false},{"year":1995,"finding":"RHAMM is required for migration of bovine aortic smooth muscle cells after wounding. Anti-RHAMM antisera that block HA binding abolish post-injury SMC migration. A novel RHAMM protein isoform appears within one hour after injury, and membrane expression increases in cells at the wound edge.","method":"Scratch-wound migration assay, polyclonal antibody blocking, FACS, immunoblot, confocal microscopy","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — functional antibody blocking with multiple orthogonal readouts (motility, localization, isoform expression)","pmids":["7533785"],"is_preprint":false},{"year":1996,"finding":"c-Src kinase is required for RHAMM-dependent cell motility and acts downstream of RHAMM in the regulation of locomotion. Src physically associates with RHAMM in ras-transformed cells; dominant-negative src inhibits RHAMM-dependent ras and serum-regulated locomotion; v-Src enhances motility independently of RHAMM but cannot restore focal adhesion turnover in the absence of RHAMM.","method":"Src-knockout fibroblasts, kinase-dead and truncated Src expression, dominant-negative src, v-src overexpression, anti-RHAMM blocking antibodies, co-immunoprecipitation","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with src-null cells plus reciprocal co-IP and multiple functional readouts","pmids":["8950989"],"is_preprint":false},{"year":1996,"finding":"TGF-β1 stabilizes RHAMM mRNA approximately 3-fold through a specific 30-nucleotide cis-element in the 3'-UTR containing three copies of GCUUGC. This element interacts with multiple cytoplasmic trans-acting protein complexes (~175, 97, 63, 26, and 17 kDa) post-TGF-β1 treatment, and insertion of the 3'-UTR into a reporter gene confers TGF-β1-induced mRNA stability.","method":"mRNA half-life measurement, RNA-protein binding assays, deletion analysis of 3'-UTR, stable transfection of CAT reporter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — multiple methods including reporter assay and deletion mutagenesis confirming cis-element requirement","pmids":["8663000"],"is_preprint":false},{"year":1998,"finding":"RHAMM isoforms regulate ERK activity. An intracellular isoform (RHAMMv4, encoding exon 4) co-immunoprecipitates with MEK1 and ERK; a dominant-negative RHAMMv4 inhibits mutant-active Ras activation of ERK; overexpression of RHAMMv4 constitutively activates ERK. Cell-surface RHAMM isoforms participate in PDGF-stimulated ERK activation.","method":"Co-immunoprecipitation, dominant-negative expression, ERK kinase assays, flow cytometry, confocal analysis, anti-exon-4 antibody blocking","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — co-IP of complex plus dominant-negative epistasis and constitutive activation, multiple orthogonal methods","pmids":["9556628"],"is_preprint":false},{"year":1998,"finding":"In human breast cancer cells, RHAMM is predominantly an intracellular protein localized in the cytoplasm (not the cell surface), as confirmed by subcellular fractionation. The intracellular RHAMM isoforms bind hyaluronan but not heparin or chondroitin sulfate, and a potential N-terminal HA-binding motif is not involved in this interaction.","method":"Subcellular fractionation, western blot, immunofluorescence, in vitro HA binding assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — fractionation with functional binding confirmation, two orthogonal localization approaches","pmids":["9601098"],"is_preprint":false},{"year":1999,"finding":"RHAMM/IHABP colocalizes with and directly binds microtubules via an N-terminal domain (comprising two subdomains: one sufficient for mitotic spindle binding, both required for interphase microtubule binding). RHAMM also interacts with actin filaments in vivo and in vitro, and binds calmodulin in a Ca2+-dependent manner via residues 574-602.","method":"GFP-fusion protein localization, microtubule-binding assays, deletion mutant transfection, calmodulin affinity chromatography, in vitro F-actin co-sedimentation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro binding assays with deletion mutagenesis plus live-cell localization, multiple interacting partners identified","pmids":["10547355"],"is_preprint":false},{"year":2001,"finding":"In rat brain, RHAMM isoforms show differential subcellular distribution: 66 kDa and 85-90 kDa forms are enriched in soluble fractions, while the 75 kDa form localizes to mitochondria (non-intrinsic membrane association, liberated by alkali carbonate). Brain RHAMM binds calmodulin in a Ca2+-dependent manner via calmodulin affinity chromatography.","method":"Subcellular fractionation, western blot, calmodulin affinity chromatography, double immunohistochemistry with cytochrome oxidase","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — fractionation with multiple isoforms and calmodulin-binding confirmation, single lab","pmids":["11433424"],"is_preprint":false},{"year":2003,"finding":"RHAMM localizes to centrosomes and is required for mitotic spindle integrity. The C-terminal domain (overlapping the HA-binding domain, bearing 72% identity to the dynein interaction domain of Xklp2) is required for centrosomal targeting, and RHAMM antibodies co-immunoprecipitate dynein IC from Xenopus and HeLa extracts. Deregulation of RHAMM expression inhibits mitotic progression and affects spindle architecture.","method":"Co-immunoprecipitation (dynein IC), deletion analysis for centrosomal targeting, immunofluorescence localization, RHAMM overexpression/depletion with spindle phenotype readout","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — co-IP with dynein, domain mapping, and functional spindle phenotype, multiple orthogonal approaches","pmids":["12808028"],"is_preprint":false},{"year":2004,"finding":"Intracellular hyaluronan co-localizes with RHAMM and tubulin in the mitotic spindle of arterial smooth muscle cells. In permeabilized cells, fluorescein-hyaluronan binds to RHAMM-associated microtubules, suggesting intracellular HA-RHAMM-microtubule complexes in cell division.","method":"Immunofluorescence co-localization, permeabilized cell fluorescein-HA binding","journal":"The journal of histochemistry and cytochemistry","confidence":"Low","confidence_rationale":"Tier 3 — localization without rigorous functional follow-up, single method","pmids":["15557208"],"is_preprint":false},{"year":2006,"finding":"RHAMM (not CD44) mediates hyaluronan-induced vascular smooth muscle cell migration through a PI3K-dependent Rac activation pathway. siRNA knockdown of RHAMM inhibits both HA-induced migration and Rac activation, while CD44 knockdown inhibits RhoA activation but not migration. RHAMM and CD44 independently activate Rac and RhoA, respectively.","method":"siRNA knockdown, Rho/Rac pull-down activity assays, PI3K inhibitor (LY294002), migration assays, anti-CD44 antibody blocking","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — siRNA with multiple Rho-family activity assays and pharmacological inhibitors, clear pathway dissection","pmids":["16934786"],"is_preprint":false},{"year":2007,"finding":"Cell-surface RHAMM and CD44 form a complex with ERK1/2 in invasive breast cancer cells, sustaining high basal ERK1/2 activation and rapid cell motility. This complex depends on endogenous HA synthesis and co-immunoprecipitates and co-localizes exclusively in highly motile/invasive MDA-MB-231 and Ras-MCF10A cells. Combined anti-CD44, anti-RHAMM, and MEK1 inhibitor treatment showed less-than-additive inhibition, consistent with a common signaling pathway.","method":"Co-immunoprecipitation, confocal co-localization, antibody blocking, MEK1 inhibitor (PD098059), motility assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with co-localization and pharmacological dissection, moderate evidence","pmids":["17392272"],"is_preprint":false},{"year":2007,"finding":"RHAMM physically associates with RON (recepteur d'origine nantais, an HGF receptor family member) at the apex of ciliated airway epithelial cells, mediating low-molecular-weight HA fragment-induced increases in ciliary beat frequency. Co-immunoprecipitation confirmed the RHAMM-RON complex; RON inhibitor (beta-MSP) and tyrosine kinase inhibitor (genistein) blocked the HA-induced ciliary response.","method":"Co-immunoprecipitation, immunohistochemistry co-localization, function-blocking anti-RHAMM antibody, RON inhibitor, ciliary beat frequency measurement","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional pharmacological validation, single lab","pmids":["17395888"],"is_preprint":false},{"year":2008,"finding":"RHAMM expression is regulated during the cell cycle, peaking at S/G2M phase, and is transcriptionally repressed by the tumor suppressor p53. p53-mediated repression acts via the RHAMM promoter (including first exon and first intron) as demonstrated by reporter assays in a p53-inducible system and with nutlin-3, doxorubicin, or paclitaxel treatment.","method":"Cell cycle synchronization, qRT-PCR, western blot, luciferase reporter assay, p53-inducible transgenic system, pharmacological p53 activation","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay with multiple p53-activating stimuli, single lab","pmids":["18971636"],"is_preprint":false},{"year":2010,"finding":"Intracellular RHAMM (RHAMMΔ163) promotes interphase microtubule instability and mitotic spindle integrity through MEK1/ERK1/2 activity. RHAMM knockout MEFs show acetylated interphase microtubules, multipolar spindles, and aberrant cytokinesis, rescued by RHAMM or mutant-active MEK1 expression. RHAMM binds α- and β-tubulin via a C-terminal leucine zipper and directly binds ERK1 via a D-site motif; RHAMM-ERK1/2-MEK1-tubulin complexes were detected by co-IP and pulldown.","method":"RHAMM-/- MEF rescue experiments, mutant-active MEK1 expression, co-immunoprecipitation, pulldown assays, in vitro kinase assays, D-site motif mutation, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro kinase assays, co-IP of complex, domain mutations, and RHAMM-null rescue; multiple orthogonal methods","pmids":["20558733"],"is_preprint":false},{"year":2011,"finding":"RHAMM mediates low-molecular-weight HA (LMWHA)-induced fibrosarcoma cell adhesion to fibronectin via ERK1/2 and focal adhesion kinase (FAK) phosphorylation. RHAMM-deficient (not CD44-deficient) HT1080 cells fail to adhere in response to LMWHA. ERK1/2 acts upstream of FAK in this pathway; ERK1/2 inhibition abolishes LMWHA-dependent adhesion.","method":"siRNA knockdown, western blot for ERK1/2 and FAK phosphorylation, ERK1/2 inhibitor, adhesion assays on fibronectin","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — receptor-specific siRNA with pharmacological pathway dissection and clear molecular readouts","pmids":["21914806"],"is_preprint":false},{"year":2011,"finding":"BRCA1 and RHAMM, together with AURKA and TPX2, regulate apicobasal polarity through reorganization of microtubules in MCF10A cells. BRCA1 facilitates microtubule reorganization, AURKA impairs it, and RHAMM and TPX2 regulate AURKA through a negative feedback loop. HMMR genetic variation modifies breast cancer risk in BRCA1 (but not BRCA2) mutation carriers.","method":"MCF10A polarization assays, AURKA/RHAMM/TPX2 knockdown, immunofluorescence, genetic association analysis","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional cell polarization assay with knockdown and molecular pathway, single lab for cell biology","pmids":["22110403"],"is_preprint":false},{"year":2011,"finding":"Rear polarization of the microtubule-organizing center (MTOC) in neointimal smooth muscle cells requires PKCα-phosphorylated RHAMM and ARPC5. RNA silencing of RHAMM, ARPC5 or PKC inhibition disrupts MTOC rear-polarization and inhibits neointimal SMC migration. RHAMM and ARPC5 were identified as PKC-phosphorylated proteins by phosphoproteomic screening and mass spectrometry.","method":"Phosphoproteomic screening, mass spectrometry, siRNA silencing, MTOC orientation assay, PKC inhibition, non-phosphorylatable ARPC5 mutant","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic identification plus siRNA functional validation, single lab","pmids":["21281821"],"is_preprint":false},{"year":2012,"finding":"HA induces an interaction between RHAMM and TGFβ receptor I (via CD44/PKCδ), and induction of PAI-1 is dependent on this RHAMM-TGFβRI interaction and downstream ERK signaling, promoting angiogenesis.","method":"Co-immunoprecipitation of RHAMM and TGFβRI, siRNA knockdown, cytokine arrays, endothelial tube formation assay","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 3 — single co-IP with siRNA validation, moderate mechanistic follow-up","pmids":["22610405"],"is_preprint":false},{"year":2012,"finding":"A RHAMM-mimetic peptide (P15-1) specifically blocks hyaluronan oligosaccharide binding to recombinant RHAMM (but not CD44 or TLR2/4) and reduces wound macrophage number, fibroblast number, blood vessel density, and collagen/TGFβ1/αSMA in rat excisional wounds. The peptide was ineffective in RHAMM-/- mice, confirming RHAMM specificity. Signaling analysis showed P15-1 blocks RHAMM-regulated FAK pathways in fibroblasts.","method":"Phage display peptide selection, recombinant protein binding assay (Kd measurement), RHAMM-/- mouse comparison, wound repair histology, microarray/signaling analysis","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including knockout mouse confirmation and molecular specificity assay","pmids":["22889846"],"is_preprint":false},{"year":2013,"finding":"RHAMM expression is regulated by YAP/TEAD transcription factor downstream of the Hippo and mevalonate pathways. YAP/TEAD directly binds the RHAMM promoter; simvastatin inhibits YAP nuclear localization, reducing RHAMM transcription and breast cancer cell migration/invasion. This regulation requires geranylgeranylation, Rho GTPase activation, and actin cytoskeleton rearrangement but is largely independent of MST/LATS kinase activity.","method":"YAP/TEAD ChIP on RHAMM promoter, reporter assays, siRNA knockdown, simvastatin treatment, RhoA inhibition, in vitro and in vivo migration/invasion assays","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP evidence of direct promoter binding with multiple pathway inhibitors and in vivo validation","pmids":["24367099"],"is_preprint":false},{"year":2013,"finding":"RHAMM forms an intracellular complex with β-catenin, protecting β-catenin from degradation and supporting its nuclear translocation, leading to c-Myc activation and enhanced fibrosarcoma cell proliferation. LMWHA-driven fibrosarcoma growth depends on this RHAMM/β-catenin/c-Myc axis.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, western blot, proliferation assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 — single co-IP with knockdown functional readout, single lab","pmids":["26825774"],"is_preprint":false},{"year":2014,"finding":"RHAMM is required for spatial regulation of Aurora kinase A (AURKA) activity during mitotic spindle assembly. RHAMM localizes to centrosomes and non-centrosomal kinetochore-proximal sites, is required for AURKA activation, and forms a complex with TPX2 via a C-terminal basic leucine zipper in RHAMM and a domain including the TPX2 NLS. RHAMM silencing delays spindle assembly, mislocalizes TPX2, attenuates AURKA activation, and reduces spindle length.","method":"Immunofluorescence localization, siRNA silencing, AURKA kinase activity measurement, co-immunoprecipitation of RHAMM-TPX2 complex, domain mapping","journal":"Cell cycle","confidence":"High","confidence_rationale":"Tier 2 — co-IP with domain mapping, kinase activity assay, and functional spindle phenotype, multiple orthogonal approaches","pmids":["24875404"],"is_preprint":false},{"year":2014,"finding":"E2F1 directly upregulates RHAMM transcription, and RHAMM in turn acts as a co-activator of E2F1 to stimulate fibronectin expression. Enhanced fibronectin secretion links E2F1/RHAMM transcriptional activity to integrin-β1-FAK signaling, cytoskeletal remodeling, and tumor cell motility and extravasation. RHAMM depletion abolishes fibronectin expression and transmigration in E2F1-activated cells.","method":"ChIP/promoter analysis (E2F1 on RHAMM promoter), siRNA knockdown, fibronectin ELISA, transendothelial migration assay, in vivo xenograft extravasation model","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptional co-activation mechanism with in vivo validation, single lab","pmids":["25042645"],"is_preprint":false},{"year":2015,"finding":"HA and Hmmr are required for epicardial cell epithelial-mesenchymal transition (EMT) and migration into the regenerating zebrafish ventricle. Hmmr depletion blocks cardiac regeneration; chemical inhibition of FAK or Src (downstream of Hmmr) prevents epicardial cell migration, defining a HA/Hmmr/FAK/Src pathway in heart regeneration.","method":"Zebrafish hmmr morpholino knockdown, ventricular resection model, FAK/Src chemical inhibitors, proteomics identification, EMT marker analysis","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined pathway inhibitors, model organism","pmids":["26156497"],"is_preprint":false},{"year":2016,"finding":"Spindle-associated RHAMM regulates oriented (planar) division of testicular germ cells. RHAMM loss-of-function (caused by downregulation of CFIm25-mediated polyadenylation) dissociates RHAMM from the spindle, causes defective planar divisions, premature germ cell displacement, hypofertility, and seminoma. RHAMM association with the spindle was abolished in 96% of human seminomas.","method":"Mouse models, Hmmr immunostaining at spindle, human seminoma tissue analysis, CFIm25 knockdown, spindle orientation assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic model with human tissue validation and defined molecular mechanism (CFIm25/RHAMM/spindle axis)","pmids":["27543603"],"is_preprint":false},{"year":2017,"finding":"HMMR acts at centrosomes in a PLK1-dependent pathway to locate active Ran and modulate cortical NuMA-dynein complex localization for mitotic spindle positioning. Hmmr-knockout mice show neonatal lethality with defective neural development, and HMMR overexpression induces spindle orientation defects consistent with increased active Ran. This identifies HMMR as an essential regulator of progenitor cell division orientation.","method":"Hmmr-knockout mouse generation and analysis, HMMR overexpression in cancer cells, Ran activity assays, NuMA-dynein cortical localization analysis, spindle orientation measurements","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout mouse with multiple tissue phenotypes and molecular pathway (PLK1-Ran-NuMA-dynein) defined","pmids":["28994651"],"is_preprint":false},{"year":2018,"finding":"RHAMM acts as a co-activator in the nuclear transcription complex and also functions intracellularly to regulate ERK1/2 activation and MMP-9 expression in a cell-type-specific manner during wound repair. In fibroblasts, RHAMM promotes ERK1/2 activation and MMP-9 expression; in keratinocytes, RHAMM suppresses these activities. Loss of RHAMM in keratinocytes promotes EGFR-regulated MMP-9 expression via ERK1/2, causing CD44 ectodomain cleavage and increased keratinocyte motility.","method":"Rhamm-null mouse excisional wound model, ERK1/2 phosphorylation assays, MMP-9 expression analysis, CD44 ectodomain shedding assay, cell-specific migration assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout mouse with cell-type-specific molecular mechanism defined across multiple readouts","pmids":["32165498"],"is_preprint":false},{"year":2018,"finding":"BACH1 phosphorylation during mitosis promotes its interaction with HMMR (and CRM1) to stabilize mitotic spindle orientation. This interaction requires mitosis-specific phosphorylation of BACH1 (identified by SILAC mass spectrometry); mutation of these phosphorylation sites abolishes BACH1-HMMR interaction and spindle orientation rescue activity.","method":"SILAC mass spectrometry of BACH1 complexes, co-immunoprecipitation, phosphorylation-site mutagenesis, spindle orientation assay, BACH1 knockdown rescue experiments","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — MS-identified phosphorylation with co-IP and mutant rescue, single lab","pmids":["29459360"],"is_preprint":false},{"year":2019,"finding":"The RHAMMB isoform (lacking a 15-amino-acid stretch present in RHAMMA) promotes PNET liver metastasis via EGFR signaling; EGFR knockdown abolishes RHAMMB-driven metastasis. RHAMMA does not promote metastasis. RHAMMB expression correlates with higher EGFR expression in pancreatic ductal adenocarcinoma.","method":"RNA-Seq isoform analysis, in vivo spontaneous and experimental metastasis mouse models, EGFR knockdown, tumor growth assays","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo isoform-specific functional studies with EGFR epistasis, single lab","pmids":["31072393"],"is_preprint":false},{"year":2020,"finding":"CD44/RHAMM complex formation is upregulated when cells interact with immobilized (but not soluble) hyaluronan, as demonstrated by FRET microscopy and co-immunoprecipitation. Expression of both CD44 and RHAMM is regulated via HA interactions in a cell-specific feedback loop.","method":"FRET microscopy, co-immunoprecipitation, immunocytochemistry in breast cancer cell lines with soluble vs. immobilized HA","journal":"Acta biomaterialia","confidence":"Medium","confidence_rationale":"Tier 2 — FRET and co-IP showing complex formation under defined HA presentation conditions","pmids":["33091625"],"is_preprint":false},{"year":2022,"finding":"HMMR overexpression in mouse mammary epithelium increases BRCA1-mutant tumorigenesis by activating AURKA and reducing ARPC2 localization at the mitotic cell cortex, leading to micronucleation and activation of cGAS-STING and non-canonical NF-κB signaling, with downstream epithelial-to-mesenchymal transition and tumor-associated macrophage infiltration.","method":"HMMR-overexpressing transgenic mouse mammary model with Brca1 mutation, AURKA activity assays, ARPC2 cortical localization immunofluorescence, cGAS-STING pathway analysis, tumor microenvironment profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo transgenic mouse model with molecular pathway (AURKA/ARPC2/cGAS-STING/NF-κB) defined by multiple approaches","pmids":["35393420"],"is_preprint":false},{"year":2023,"finding":"HMMR alleviates ER stress by promoting autophagic lysosomal activity in hepatocellular carcinoma. Under ER stress, HMMR is transcriptionally induced by CHOP and degraded by TRIM29-mediated ubiquitination. Mechanistically, HMMR controls the intensity of ER stress by regulating autophagy.","method":"HBV-transgenic mouse model, luciferase reporter (CHOP on HMMR promoter), ChIP, co-immunoprecipitation, immunoprecipitation, ubiquitination assay, autophagy/ER stress marker analysis","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and co-IP with ubiquitination assay identifying writer (TRIM29) and transcription factor (CHOP), single lab","pmids":["37405956"],"is_preprint":false},{"year":2023,"finding":"HMMR interacts with AURKA and stabilizes AURKA protein by inhibiting its ubiquitination-mediated degradation, which subsequently activates the mTORC2/AKT pathway in prostate cancer. Activated mTORC2/AKT induces E2F1, which transcriptionally promotes HMMR expression, forming a positive feedback loop. mTOR inhibition partially antagonizes HMMR-mediated tumor progression in vivo.","method":"Co-immunoprecipitation (HMMR-AURKA), ubiquitination assay, gain/loss-of-function experiments, mTOR inhibitor in vivo, transcription factor (E2F1) promoter analysis","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with ubiquitination assay and in vivo pharmacological validation, single lab","pmids":["36750558"],"is_preprint":false}],"current_model":"HMMR/RHAMM is a multifunctional protein that operates both extracellularly as a hyaluronan receptor (binding HA via conserved C-terminal B(X7)B motifs to activate ERK1/2, FAK, Src, PI3K-Rac, and Rho-ROCK signaling pathways promoting cell motility) and intracellularly as a microtubule-associated, centrosomal scaffold protein that recruits ERK1/2-MEK1 complexes to stabilize spindle microtubules, interacts with dynein, localizes Aurora kinase A activity via TPX2, and acts in a PLK1-dependent pathway to orient the mitotic spindle; its expression is transcriptionally controlled by p53 (repression) and YAP/TEAD (activation), and post-translationally it stabilizes AURKA from ubiquitin-mediated degradation while being itself subject to TRIM29-mediated ubiquitination under ER stress."},"narrative":{"teleology":[{"year":1994,"claim":"Identification of the HA-binding mechanism resolved how HMMR recognizes its principal extracellular ligand: two C-terminal B(X7)B motifs are necessary and sufficient for hyaluronan binding, a motif shared with CD44 and link protein.","evidence":"GST-fusion truncations, site-directed mutagenesis of basic residues, HA-Sepharose binding, chimeric protein construction","pmids":["7682552","7508860"],"confidence":"High","gaps":["Structural basis of HA-RHAMM interaction unresolved","Relative contribution of each B(X7)B motif in vivo unknown"]},{"year":1995,"claim":"Establishing HMMR as a Ras-pathway effector that promotes transformation and metastasis answered whether HMMR had oncogenic capacity and placed it genetically downstream of H-Ras, upstream of FAK-dependent focal adhesion turnover.","evidence":"Overexpression/antisense/dominant-negative RHAMM in fibroblasts, ras-transformed fibrosarcoma reversion, in vivo tumorigenesis, FAK phosphorylation","pmids":["7541721"],"confidence":"High","gaps":["Direct binding partner linking Ras to RHAMM not identified","Mechanism of cell-surface vs. intracellular RHAMM contribution to transformation unclear"]},{"year":1998,"claim":"Discovery that intracellular RHAMM isoforms scaffold MEK1-ERK1/2 complexes revealed a non-receptor signaling role, explaining how RHAMM activates ERK independently of cell-surface ligand engagement.","evidence":"Co-immunoprecipitation of RHAMMv4 with MEK1/ERK, dominant-negative epistasis, constitutive ERK activation upon overexpression","pmids":["9556628"],"confidence":"High","gaps":["Stoichiometry and regulation of the RHAMM-MEK1-ERK complex undetermined","Whether intracellular HA binding modulates this scaffolding function unknown"]},{"year":1999,"claim":"Demonstrating direct microtubule binding via an N-terminal domain established HMMR as a bona fide microtubule-associated protein, linking its intracellular pool to cytoskeletal regulation beyond signaling scaffold roles.","evidence":"GFP-fusion localization, in vitro microtubule-binding assays, deletion mutagenesis, calmodulin affinity chromatography","pmids":["10547355"],"confidence":"High","gaps":["Whether microtubule binding and HA binding are mutually exclusive or concurrent unknown","Role of calmodulin binding in regulating HMMR-microtubule interaction not tested"]},{"year":2003,"claim":"Localization of HMMR to centrosomes and identification of its interaction with dynein through a C-terminal Xklp2-like domain established HMMR as a centrosomal protein required for mitotic spindle integrity.","evidence":"Co-IP of dynein IC, deletion mapping of centrosomal targeting domain, HMMR depletion/overexpression spindle phenotypes","pmids":["12808028"],"confidence":"High","gaps":["Whether dynein interaction is direct or bridged by adaptor proteins unresolved","Regulation of HMMR centrosomal recruitment mechanism unknown"]},{"year":2007,"claim":"Demonstration that cell-surface RHAMM and CD44 form a ternary complex with ERK1/2 in invasive breast cancer cells explained how co-receptor assembly sustains high basal motility signaling in aggressive cancers.","evidence":"Reciprocal co-IP, confocal co-localization, antibody blocking and MEK1 inhibitor in MDA-MB-231 cells","pmids":["17392272"],"confidence":"High","gaps":["Whether the complex requires direct RHAMM-CD44 contact or is bridged by HA uncertain","Structural determinants of receptor complex assembly unknown"]},{"year":2010,"claim":"Using RHAMM-knockout MEFs to show that RHAMM controls interphase microtubule dynamics and spindle bipolarity through MEK1/ERK1/2, and mapping its direct ERK1 D-site and tubulin leucine-zipper binding domains, unified its scaffolding and cytoskeletal functions into a single mechanistic model.","evidence":"RHAMM−/− MEF rescue with RHAMM or constitutively active MEK1, co-IP/pulldown of RHAMM-ERK1-tubulin complex, D-site mutation","pmids":["20558733"],"confidence":"High","gaps":["Whether RHAMM directly activates MEK1 or merely co-localizes it with substrates undetermined","Contribution of intracellular HA to this pathway untested in knockout system"]},{"year":2013,"claim":"Identification of YAP/TEAD as a direct transcriptional activator of HMMR downstream of the mevalonate-Rho pathway provided the first link between Hippo pathway output and HMMR-dependent cell invasion, explaining how metabolic cues regulate HMMR levels.","evidence":"ChIP of TEAD on HMMR promoter, reporter assays, simvastatin and RhoA inhibition, in vivo migration assays","pmids":["24367099"],"confidence":"High","gaps":["Whether p53 and YAP/TEAD compete at the HMMR promoter uncharacterized","Chromatin-level regulation of HMMR transcription not defined"]},{"year":2014,"claim":"Showing that HMMR forms a complex with TPX2 and is required for spatial activation of AURKA at centrosomal and kinetochore-proximal sites resolved how HMMR contributes to spindle assembly kinetics and length control.","evidence":"Co-IP of RHAMM-TPX2, domain mapping (C-terminal basic leucine zipper), AURKA kinase activity assay, siRNA spindle phenotype","pmids":["24875404"],"confidence":"High","gaps":["Whether HMMR directly activates AURKA or acts solely through TPX2 localization unclear","Regulation of HMMR-TPX2 complex formation during cell cycle not mapped"]},{"year":2017,"claim":"Generation of Hmmr-knockout mice revealed neonatal lethality with neural defects and established that HMMR operates in a PLK1-dependent pathway controlling Ran activity and cortical NuMA-dynein to orient mitotic spindles in progenitor cells.","evidence":"Hmmr-knockout mouse phenotyping, Ran activity assays, NuMA-dynein cortical localization, spindle orientation measurements","pmids":["28994651"],"confidence":"High","gaps":["How PLK1 regulates HMMR (phosphorylation sites, binding) not biochemically defined","Whether spindle orientation defects fully account for neonatal lethality unknown"]},{"year":2022,"claim":"Transgenic HMMR overexpression in BRCA1-mutant mammary epithelium demonstrated that excess HMMR drives tumorigenesis through AURKA hyperactivation, ARPC2 mislocalization, micronucleation, and consequent cGAS-STING/NF-κB inflammatory signaling, connecting spindle defects to the tumor microenvironment.","evidence":"HMMR-overexpressing Brca1-mutant transgenic mouse, AURKA activity, ARPC2 immunofluorescence, cGAS-STING pathway and macrophage profiling","pmids":["35393420"],"confidence":"High","gaps":["Whether cGAS-STING activation is a direct consequence of micronuclei or involves additional HMMR-dependent signals untested","Therapeutic window for AURKA inhibition in HMMR-high tumors undefined"]},{"year":2023,"claim":"Two studies expanded HMMR's post-translational regulation: HMMR stabilizes AURKA by inhibiting its ubiquitination (forming an HMMR-AURKA-mTORC2-AKT-E2F1 feedback loop), and HMMR itself is degraded by TRIM29-mediated ubiquitination under ER stress while promoting autophagy-lysosome activity.","evidence":"Co-IP of HMMR-AURKA, ubiquitination assays, mTOR inhibitor in vivo, CHOP ChIP on HMMR promoter, TRIM29 ubiquitination assay","pmids":["36750558","37405956"],"confidence":"Medium","gaps":["Identity of the E3 ligase whose activity on AURKA is blocked by HMMR unknown","Whether TRIM29-mediated degradation of HMMR operates outside ER stress contexts untested","Feedback loop components not validated in non-cancer cell types"]},{"year":null,"claim":"Key unresolved questions include the structural basis of HMMR's multivalent interactions (HA, tubulin, TPX2, dynein, ERK), how isoform-specific functions are partitioned between extracellular and intracellular pools in vivo, and whether HMMR's spindle and signaling functions are mechanistically coupled or independently regulated.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of HMMR or its complexes","Isoform-specific knockout models not available","Relationship between HA-binding and spindle functions not experimentally dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,17,25]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,11,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[25,36]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[26]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[9,11,17]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[11,25,29]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,14,33]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,5,7,13,14,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,16,17,25,29]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[3,13,33]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[22,26]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[35]}],"complexes":["RHAMM-CD44-ERK1/2 surface signaling complex","RHAMM-MEK1-ERK1/2-tubulin intracellular complex","RHAMM-TPX2-AURKA spindle complex"],"partners":["CD44","AURKA","TPX2","MAPK3","MAP2K1","DYNC1I2","SRC","BACH1"],"other_free_text":[]},"mechanistic_narrative":"HMMR/RHAMM is a multifunctional scaffold protein that operates both as an extracellular hyaluronan receptor driving cell motility and as an intracellular centrosomal/spindle-associated protein essential for mitotic spindle assembly, orientation, and integrity. Extracellularly, HMMR binds hyaluronan through C-terminal B(X7)B motifs and activates ERK1/2, FAK, Src, and PI3K-Rac signaling cascades to promote cell migration, adhesion, and focal adhesion turnover, functioning downstream of H-Ras [PMID:7682552, PMID:7508860, PMID:7541721, PMID:16934786, PMID:21914806]. Intracellularly, HMMR associates with microtubules, centrosomes, and dynein via its C-terminal domain, scaffolds an ERK1/2-MEK1-tubulin complex to regulate interphase microtubule dynamics and spindle architecture, localizes TPX2 to activate AURKA, and participates in a PLK1-Ran-NuMA-dynein pathway that orients the mitotic spindle in progenitor cells [PMID:12808028, PMID:20558733, PMID:24875404, PMID:28994651]. HMMR transcription is repressed by p53, activated by YAP/TEAD and E2F1, and peaks at S/G2-M; the protein stabilizes AURKA from ubiquitin-mediated degradation and is itself targeted for degradation by TRIM29-mediated ubiquitination under ER stress [PMID:18971636, PMID:24367099, PMID:36750558, PMID:37405956]."},"prefetch_data":{"uniprot":{"accession":"O75330","full_name":"Hyaluronan mediated motility receptor","aliases":["Intracellular hyaluronic acid-binding protein","Receptor for hyaluronan-mediated motility"],"length_aa":724,"mass_kda":84.1,"function":"Receptor for hyaluronic acid (HA) (By similarity). Involved in cell motility (By similarity). When hyaluronan binds to HMMR, the phosphorylation of a number of proteins, including PTK2/FAK1 occurs. May also be involved in cellular transformation and metastasis formation, and in regulating extracellular-regulated kinase (ERK) activity. May act as a regulator of adipogenisis (By similarity)","subcellular_location":"Cell surface; Cytoplasm; Cytoplasm, cytoskeleton, spindle","url":"https://www.uniprot.org/uniprotkb/O75330/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HMMR","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DYNLL2","stoichiometry":10.0},{"gene":"CSNK1A1","stoichiometry":4.0},{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"TUBB4B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HMMR","total_profiled":1310},"omim":[{"mim_id":"617569","title":"KINESIN FAMILY, MEMBER 15; KIF15","url":"https://www.omim.org/entry/617569"},{"mim_id":"611814","title":"ELONGATION OF VERY LONG CHAIN FATTY ACIDS-LIKE 2; ELOVL2","url":"https://www.omim.org/entry/611814"},{"mim_id":"600936","title":"HYALURONAN-MEDIATED MOTILITY RECEPTOR; HMMR","url":"https://www.omim.org/entry/600936"},{"mim_id":"114480","title":"BREAST CANCER","url":"https://www.omim.org/entry/114480"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Microtubules","reliability":"Enhanced"},{"location":"Centrosome","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":19.4},{"tissue":"lymphoid tissue","ntpm":25.4},{"tissue":"testis","ntpm":25.7}],"url":"https://www.proteinatlas.org/search/HMMR"},"hgnc":{"alias_symbol":["RHAMM","CD168"],"prev_symbol":[]},"alphafold":{"accession":"O75330","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75330","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75330-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75330-F1-predicted_aligned_error_v6.png","plddt_mean":74.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HMMR","jax_strain_url":"https://www.jax.org/strain/search?query=HMMR"},"sequence":{"accession":"O75330","fasta_url":"https://rest.uniprot.org/uniprotkb/O75330.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75330/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75330"}},"corpus_meta":[{"pmid":"25999946","id":"PMC_25999946","title":"Interactions between Hyaluronan and Its Receptors (CD44, RHAMM) Regulate the Activities of Inflammation and Cancer.","date":"2015","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/25999946","citation_count":655,"is_preprint":false},{"pmid":"7508860","id":"PMC_7508860","title":"Identification of a common hyaluronan binding motif in the hyaluronan binding proteins RHAMM, CD44 and link protein.","date":"1994","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/7508860","citation_count":353,"is_preprint":false},{"pmid":"17055233","id":"PMC_17055233","title":"Hyaluronan-mediated angiogenesis in vascular disease: uncovering RHAMM and CD44 receptor signaling pathways.","date":"2006","source":"Matrix biology : journal of the International Society for Matrix Biology","url":"https://pubmed.ncbi.nlm.nih.gov/17055233","citation_count":344,"is_preprint":false},{"pmid":"24367099","id":"PMC_24367099","title":"Interplay of mevalonate and Hippo pathways regulates RHAMM transcription via YAP to modulate breast cancer cell motility.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24367099","citation_count":277,"is_preprint":false},{"pmid":"7541721","id":"PMC_7541721","title":"Overexpression of the hyaluronan receptor RHAMM is transforming and is also required for H-ras transformation.","date":"1995","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/7541721","citation_count":252,"is_preprint":false},{"pmid":"17392272","id":"PMC_17392272","title":"The hyaluronan receptors CD44 and Rhamm (CD168) form complexes with ERK1,2 that sustain high basal motility in breast cancer cells.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17392272","citation_count":216,"is_preprint":false},{"pmid":"18354082","id":"PMC_18354082","title":"Cell-surface and mitotic-spindle RHAMM: moonlighting or dual oncogenic functions?","date":"2008","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/18354082","citation_count":190,"is_preprint":false},{"pmid":"9556628","id":"PMC_9556628","title":"The hyaluronan receptor RHAMM regulates extracellular-regulated kinase.","date":"1998","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9556628","citation_count":185,"is_preprint":false},{"pmid":"17978170","id":"PMC_17978170","title":"RHAMM-R3 peptide vaccination in patients with acute myeloid leukemia, myelodysplastic syndrome, and multiple myeloma elicits immunologic and clinical responses.","date":"2007","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/17978170","citation_count":177,"is_preprint":false},{"pmid":"7533785","id":"PMC_7533785","title":"Migration of bovine aortic smooth muscle cells after wounding injury. 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and its interacting partners TRIO, GPS2, HMMR and DIPA regulate adipogenesis in 3T3-L1 cells.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22666460","citation_count":30,"is_preprint":false},{"pmid":"21281821","id":"PMC_21281821","title":"Rear polarization of the microtubule-organizing center in neointimal smooth muscle cells depends on PKCα, ARPC5, and RHAMM.","date":"2011","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21281821","citation_count":30,"is_preprint":false},{"pmid":"26825774","id":"PMC_26825774","title":"Receptor for hyaluronic acid- mediated motility (RHAMM) regulates HT1080 fibrosarcoma cell proliferation via a β-catenin/c-myc signaling axis.","date":"2016","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/26825774","citation_count":30,"is_preprint":false},{"pmid":"36033439","id":"PMC_36033439","title":"The role of RHAMM in cancer: Exposing novel therapeutic vulnerabilities.","date":"2022","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36033439","citation_count":29,"is_preprint":false},{"pmid":"28217782","id":"PMC_28217782","title":"Receptor for hyaluronan mediated motility (RHAMM/HMMR) is a novel target for promoting subcutaneous adipogenesis.","date":"2017","source":"Integrative biology : quantitative biosciences from nano to macro","url":"https://pubmed.ncbi.nlm.nih.gov/28217782","citation_count":29,"is_preprint":false},{"pmid":"20044037","id":"PMC_20044037","title":"RHAMM mRNA expression in proliferating and migrating cells of the developing central nervous system.","date":"2010","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/20044037","citation_count":29,"is_preprint":false},{"pmid":"27543603","id":"PMC_27543603","title":"Impaired Planar Germ Cell Division in the Testis, Caused by Dissociation of RHAMM from the Spindle, Results in Hypofertility and Seminoma.","date":"2016","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/27543603","citation_count":28,"is_preprint":false},{"pmid":"22532518","id":"PMC_22532518","title":"RHAMM/HMMR (CD168) is not an ideal target antigen for immunotherapy of acute myeloid leukemia.","date":"2012","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/22532518","citation_count":28,"is_preprint":false},{"pmid":"9692758","id":"PMC_9692758","title":"The hyaluronan receptor RHAMM in noradrenergic fibers contributes to axon growth capacity of locus coeruleus neurons in an intraocular transplant model.","date":"1998","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9692758","citation_count":28,"is_preprint":false},{"pmid":"37405956","id":"PMC_37405956","title":"HMMR alleviates endoplasmic reticulum stress by promoting autophagolysosomal activity during endoplasmic reticulum stress-driven hepatocellular carcinoma progression.","date":"2023","source":"Cancer communications (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/37405956","citation_count":26,"is_preprint":false},{"pmid":"9889313","id":"PMC_9889313","title":"Characterisation of the murine gene encoding the intracellular hyaluronan receptor IHABP (RHAMM).","date":"1999","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/9889313","citation_count":26,"is_preprint":false},{"pmid":"37929733","id":"PMC_37929733","title":"FIGNL1 Promotes Hepatocellular Carcinoma Formation via Remodeling ECM-receptor Interaction Pathway Mediated by HMMR.","date":"2024","source":"Current gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/37929733","citation_count":25,"is_preprint":false},{"pmid":"33061798","id":"PMC_33061798","title":"Oleate acid-stimulated HMMR expression by CEBPα is associated with nonalcoholic steatohepatitis and hepatocellular carcinoma.","date":"2020","source":"International journal of biological 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amino acids. Synthetic peptides mimicking these domains directly bind HA-Sepharose and inhibit HA-RHAMM interactions; deletion of these domains abolishes HA binding.\",\n      \"method\": \"Recombinant GST-fusion protein truncations, HA-Sepharose binding assays, synthetic peptide competition, transblot assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro with mutagenesis and multiple orthogonal binding assays\",\n      \"pmids\": [\"7682552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"A common HA-binding motif B(X7)B (two basic amino acids flanking a seven amino acid stretch) is required for HA binding in RHAMM, CD44, and link protein. Mutation of K423 and R431 in RHAMM domain II abolished HA binding; mutation of all B(X7)B basic residues to histidine eliminated binding. Chimeric proteins containing B(X7)B motifs from CD44 or link protein acquired HA-binding activity.\",\n      \"method\": \"Site-directed mutagenesis of recombinant RHAMM polypeptides, HA-Sepharose binding, transblot assays, chimeric protein construction\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with site-directed mutagenesis and multiple binding assays; foundational mechanistic study\",\n      \"pmids\": [\"7508860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"RHAMM also contains heparin-binding sites within the same 35 amino acid C-terminal region as the HA-binding domains. Heparin at physiological concentrations stimulates cell locomotion in a RHAMM-dependent manner (blocked by anti-RHAMM antibodies), while lower concentrations inhibit HA-induced locomotion independently of RHAMM.\",\n      \"method\": \"Ligand blotting with biotin-labeled heparin, GST-RHAMM fusion protein binding, HP-Sepharose affinity, anti-RHAMM antibody blocking of cell locomotion\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple binding assays plus functional cell locomotion readout, single lab\",\n      \"pmids\": [\"7534313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Overexpression of RHAMM in fibroblasts is transforming and causes lung metastases. RHAMM acts downstream of H-ras: dominant-suppressor RHAMM mutants revert ras-transformed fibrosarcomas to nontumorigenic, and antisense RHAMM renders fibroblasts resistant to ras transformation. Loss of functional RHAMM ablates focal adhesion kinase phosphorylation changes and prevents focal adhesion turnover in response to hyaluronan.\",\n      \"method\": \"Stable transfection (overexpression and antisense), dominant-negative mutant expression, in vivo tumorigenesis and metastasis assays, FAK phosphorylation western blot, focal adhesion assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (ras pathway), loss-of-function and gain-of-function with defined molecular and cellular readouts; high-citation foundational paper\",\n      \"pmids\": [\"7541721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"RHAMM is required for migration of bovine aortic smooth muscle cells after wounding. Anti-RHAMM antisera that block HA binding abolish post-injury SMC migration. A novel RHAMM protein isoform appears within one hour after injury, and membrane expression increases in cells at the wound edge.\",\n      \"method\": \"Scratch-wound migration assay, polyclonal antibody blocking, FACS, immunoblot, confocal microscopy\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional antibody blocking with multiple orthogonal readouts (motility, localization, isoform expression)\",\n      \"pmids\": [\"7533785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"c-Src kinase is required for RHAMM-dependent cell motility and acts downstream of RHAMM in the regulation of locomotion. Src physically associates with RHAMM in ras-transformed cells; dominant-negative src inhibits RHAMM-dependent ras and serum-regulated locomotion; v-Src enhances motility independently of RHAMM but cannot restore focal adhesion turnover in the absence of RHAMM.\",\n      \"method\": \"Src-knockout fibroblasts, kinase-dead and truncated Src expression, dominant-negative src, v-src overexpression, anti-RHAMM blocking antibodies, co-immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with src-null cells plus reciprocal co-IP and multiple functional readouts\",\n      \"pmids\": [\"8950989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"TGF-β1 stabilizes RHAMM mRNA approximately 3-fold through a specific 30-nucleotide cis-element in the 3'-UTR containing three copies of GCUUGC. This element interacts with multiple cytoplasmic trans-acting protein complexes (~175, 97, 63, 26, and 17 kDa) post-TGF-β1 treatment, and insertion of the 3'-UTR into a reporter gene confers TGF-β1-induced mRNA stability.\",\n      \"method\": \"mRNA half-life measurement, RNA-protein binding assays, deletion analysis of 3'-UTR, stable transfection of CAT reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple methods including reporter assay and deletion mutagenesis confirming cis-element requirement\",\n      \"pmids\": [\"8663000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RHAMM isoforms regulate ERK activity. An intracellular isoform (RHAMMv4, encoding exon 4) co-immunoprecipitates with MEK1 and ERK; a dominant-negative RHAMMv4 inhibits mutant-active Ras activation of ERK; overexpression of RHAMMv4 constitutively activates ERK. Cell-surface RHAMM isoforms participate in PDGF-stimulated ERK activation.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative expression, ERK kinase assays, flow cytometry, confocal analysis, anti-exon-4 antibody blocking\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP of complex plus dominant-negative epistasis and constitutive activation, multiple orthogonal methods\",\n      \"pmids\": [\"9556628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In human breast cancer cells, RHAMM is predominantly an intracellular protein localized in the cytoplasm (not the cell surface), as confirmed by subcellular fractionation. The intracellular RHAMM isoforms bind hyaluronan but not heparin or chondroitin sulfate, and a potential N-terminal HA-binding motif is not involved in this interaction.\",\n      \"method\": \"Subcellular fractionation, western blot, immunofluorescence, in vitro HA binding assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — fractionation with functional binding confirmation, two orthogonal localization approaches\",\n      \"pmids\": [\"9601098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RHAMM/IHABP colocalizes with and directly binds microtubules via an N-terminal domain (comprising two subdomains: one sufficient for mitotic spindle binding, both required for interphase microtubule binding). RHAMM also interacts with actin filaments in vivo and in vitro, and binds calmodulin in a Ca2+-dependent manner via residues 574-602.\",\n      \"method\": \"GFP-fusion protein localization, microtubule-binding assays, deletion mutant transfection, calmodulin affinity chromatography, in vitro F-actin co-sedimentation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro binding assays with deletion mutagenesis plus live-cell localization, multiple interacting partners identified\",\n      \"pmids\": [\"10547355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In rat brain, RHAMM isoforms show differential subcellular distribution: 66 kDa and 85-90 kDa forms are enriched in soluble fractions, while the 75 kDa form localizes to mitochondria (non-intrinsic membrane association, liberated by alkali carbonate). Brain RHAMM binds calmodulin in a Ca2+-dependent manner via calmodulin affinity chromatography.\",\n      \"method\": \"Subcellular fractionation, western blot, calmodulin affinity chromatography, double immunohistochemistry with cytochrome oxidase\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — fractionation with multiple isoforms and calmodulin-binding confirmation, single lab\",\n      \"pmids\": [\"11433424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RHAMM localizes to centrosomes and is required for mitotic spindle integrity. The C-terminal domain (overlapping the HA-binding domain, bearing 72% identity to the dynein interaction domain of Xklp2) is required for centrosomal targeting, and RHAMM antibodies co-immunoprecipitate dynein IC from Xenopus and HeLa extracts. Deregulation of RHAMM expression inhibits mitotic progression and affects spindle architecture.\",\n      \"method\": \"Co-immunoprecipitation (dynein IC), deletion analysis for centrosomal targeting, immunofluorescence localization, RHAMM overexpression/depletion with spindle phenotype readout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with dynein, domain mapping, and functional spindle phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"12808028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Intracellular hyaluronan co-localizes with RHAMM and tubulin in the mitotic spindle of arterial smooth muscle cells. In permeabilized cells, fluorescein-hyaluronan binds to RHAMM-associated microtubules, suggesting intracellular HA-RHAMM-microtubule complexes in cell division.\",\n      \"method\": \"Immunofluorescence co-localization, permeabilized cell fluorescein-HA binding\",\n      \"journal\": \"The journal of histochemistry and cytochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization without rigorous functional follow-up, single method\",\n      \"pmids\": [\"15557208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RHAMM (not CD44) mediates hyaluronan-induced vascular smooth muscle cell migration through a PI3K-dependent Rac activation pathway. siRNA knockdown of RHAMM inhibits both HA-induced migration and Rac activation, while CD44 knockdown inhibits RhoA activation but not migration. RHAMM and CD44 independently activate Rac and RhoA, respectively.\",\n      \"method\": \"siRNA knockdown, Rho/Rac pull-down activity assays, PI3K inhibitor (LY294002), migration assays, anti-CD44 antibody blocking\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA with multiple Rho-family activity assays and pharmacological inhibitors, clear pathway dissection\",\n      \"pmids\": [\"16934786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cell-surface RHAMM and CD44 form a complex with ERK1/2 in invasive breast cancer cells, sustaining high basal ERK1/2 activation and rapid cell motility. This complex depends on endogenous HA synthesis and co-immunoprecipitates and co-localizes exclusively in highly motile/invasive MDA-MB-231 and Ras-MCF10A cells. Combined anti-CD44, anti-RHAMM, and MEK1 inhibitor treatment showed less-than-additive inhibition, consistent with a common signaling pathway.\",\n      \"method\": \"Co-immunoprecipitation, confocal co-localization, antibody blocking, MEK1 inhibitor (PD098059), motility assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with co-localization and pharmacological dissection, moderate evidence\",\n      \"pmids\": [\"17392272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RHAMM physically associates with RON (recepteur d'origine nantais, an HGF receptor family member) at the apex of ciliated airway epithelial cells, mediating low-molecular-weight HA fragment-induced increases in ciliary beat frequency. Co-immunoprecipitation confirmed the RHAMM-RON complex; RON inhibitor (beta-MSP) and tyrosine kinase inhibitor (genistein) blocked the HA-induced ciliary response.\",\n      \"method\": \"Co-immunoprecipitation, immunohistochemistry co-localization, function-blocking anti-RHAMM antibody, RON inhibitor, ciliary beat frequency measurement\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional pharmacological validation, single lab\",\n      \"pmids\": [\"17395888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RHAMM expression is regulated during the cell cycle, peaking at S/G2M phase, and is transcriptionally repressed by the tumor suppressor p53. p53-mediated repression acts via the RHAMM promoter (including first exon and first intron) as demonstrated by reporter assays in a p53-inducible system and with nutlin-3, doxorubicin, or paclitaxel treatment.\",\n      \"method\": \"Cell cycle synchronization, qRT-PCR, western blot, luciferase reporter assay, p53-inducible transgenic system, pharmacological p53 activation\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay with multiple p53-activating stimuli, single lab\",\n      \"pmids\": [\"18971636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Intracellular RHAMM (RHAMMΔ163) promotes interphase microtubule instability and mitotic spindle integrity through MEK1/ERK1/2 activity. RHAMM knockout MEFs show acetylated interphase microtubules, multipolar spindles, and aberrant cytokinesis, rescued by RHAMM or mutant-active MEK1 expression. RHAMM binds α- and β-tubulin via a C-terminal leucine zipper and directly binds ERK1 via a D-site motif; RHAMM-ERK1/2-MEK1-tubulin complexes were detected by co-IP and pulldown.\",\n      \"method\": \"RHAMM-/- MEF rescue experiments, mutant-active MEK1 expression, co-immunoprecipitation, pulldown assays, in vitro kinase assays, D-site motif mutation, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro kinase assays, co-IP of complex, domain mutations, and RHAMM-null rescue; multiple orthogonal methods\",\n      \"pmids\": [\"20558733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RHAMM mediates low-molecular-weight HA (LMWHA)-induced fibrosarcoma cell adhesion to fibronectin via ERK1/2 and focal adhesion kinase (FAK) phosphorylation. RHAMM-deficient (not CD44-deficient) HT1080 cells fail to adhere in response to LMWHA. ERK1/2 acts upstream of FAK in this pathway; ERK1/2 inhibition abolishes LMWHA-dependent adhesion.\",\n      \"method\": \"siRNA knockdown, western blot for ERK1/2 and FAK phosphorylation, ERK1/2 inhibitor, adhesion assays on fibronectin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — receptor-specific siRNA with pharmacological pathway dissection and clear molecular readouts\",\n      \"pmids\": [\"21914806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BRCA1 and RHAMM, together with AURKA and TPX2, regulate apicobasal polarity through reorganization of microtubules in MCF10A cells. BRCA1 facilitates microtubule reorganization, AURKA impairs it, and RHAMM and TPX2 regulate AURKA through a negative feedback loop. HMMR genetic variation modifies breast cancer risk in BRCA1 (but not BRCA2) mutation carriers.\",\n      \"method\": \"MCF10A polarization assays, AURKA/RHAMM/TPX2 knockdown, immunofluorescence, genetic association analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional cell polarization assay with knockdown and molecular pathway, single lab for cell biology\",\n      \"pmids\": [\"22110403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rear polarization of the microtubule-organizing center (MTOC) in neointimal smooth muscle cells requires PKCα-phosphorylated RHAMM and ARPC5. RNA silencing of RHAMM, ARPC5 or PKC inhibition disrupts MTOC rear-polarization and inhibits neointimal SMC migration. RHAMM and ARPC5 were identified as PKC-phosphorylated proteins by phosphoproteomic screening and mass spectrometry.\",\n      \"method\": \"Phosphoproteomic screening, mass spectrometry, siRNA silencing, MTOC orientation assay, PKC inhibition, non-phosphorylatable ARPC5 mutant\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification plus siRNA functional validation, single lab\",\n      \"pmids\": [\"21281821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HA induces an interaction between RHAMM and TGFβ receptor I (via CD44/PKCδ), and induction of PAI-1 is dependent on this RHAMM-TGFβRI interaction and downstream ERK signaling, promoting angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation of RHAMM and TGFβRI, siRNA knockdown, cytokine arrays, endothelial tube formation assay\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP with siRNA validation, moderate mechanistic follow-up\",\n      \"pmids\": [\"22610405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A RHAMM-mimetic peptide (P15-1) specifically blocks hyaluronan oligosaccharide binding to recombinant RHAMM (but not CD44 or TLR2/4) and reduces wound macrophage number, fibroblast number, blood vessel density, and collagen/TGFβ1/αSMA in rat excisional wounds. The peptide was ineffective in RHAMM-/- mice, confirming RHAMM specificity. Signaling analysis showed P15-1 blocks RHAMM-regulated FAK pathways in fibroblasts.\",\n      \"method\": \"Phage display peptide selection, recombinant protein binding assay (Kd measurement), RHAMM-/- mouse comparison, wound repair histology, microarray/signaling analysis\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including knockout mouse confirmation and molecular specificity assay\",\n      \"pmids\": [\"22889846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RHAMM expression is regulated by YAP/TEAD transcription factor downstream of the Hippo and mevalonate pathways. YAP/TEAD directly binds the RHAMM promoter; simvastatin inhibits YAP nuclear localization, reducing RHAMM transcription and breast cancer cell migration/invasion. This regulation requires geranylgeranylation, Rho GTPase activation, and actin cytoskeleton rearrangement but is largely independent of MST/LATS kinase activity.\",\n      \"method\": \"YAP/TEAD ChIP on RHAMM promoter, reporter assays, siRNA knockdown, simvastatin treatment, RhoA inhibition, in vitro and in vivo migration/invasion assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP evidence of direct promoter binding with multiple pathway inhibitors and in vivo validation\",\n      \"pmids\": [\"24367099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RHAMM forms an intracellular complex with β-catenin, protecting β-catenin from degradation and supporting its nuclear translocation, leading to c-Myc activation and enhanced fibrosarcoma cell proliferation. LMWHA-driven fibrosarcoma growth depends on this RHAMM/β-catenin/c-Myc axis.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, western blot, proliferation assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP with knockdown functional readout, single lab\",\n      \"pmids\": [\"26825774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RHAMM is required for spatial regulation of Aurora kinase A (AURKA) activity during mitotic spindle assembly. RHAMM localizes to centrosomes and non-centrosomal kinetochore-proximal sites, is required for AURKA activation, and forms a complex with TPX2 via a C-terminal basic leucine zipper in RHAMM and a domain including the TPX2 NLS. RHAMM silencing delays spindle assembly, mislocalizes TPX2, attenuates AURKA activation, and reduces spindle length.\",\n      \"method\": \"Immunofluorescence localization, siRNA silencing, AURKA kinase activity measurement, co-immunoprecipitation of RHAMM-TPX2 complex, domain mapping\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with domain mapping, kinase activity assay, and functional spindle phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"24875404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"E2F1 directly upregulates RHAMM transcription, and RHAMM in turn acts as a co-activator of E2F1 to stimulate fibronectin expression. Enhanced fibronectin secretion links E2F1/RHAMM transcriptional activity to integrin-β1-FAK signaling, cytoskeletal remodeling, and tumor cell motility and extravasation. RHAMM depletion abolishes fibronectin expression and transmigration in E2F1-activated cells.\",\n      \"method\": \"ChIP/promoter analysis (E2F1 on RHAMM promoter), siRNA knockdown, fibronectin ELISA, transendothelial migration assay, in vivo xenograft extravasation model\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptional co-activation mechanism with in vivo validation, single lab\",\n      \"pmids\": [\"25042645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HA and Hmmr are required for epicardial cell epithelial-mesenchymal transition (EMT) and migration into the regenerating zebrafish ventricle. Hmmr depletion blocks cardiac regeneration; chemical inhibition of FAK or Src (downstream of Hmmr) prevents epicardial cell migration, defining a HA/Hmmr/FAK/Src pathway in heart regeneration.\",\n      \"method\": \"Zebrafish hmmr morpholino knockdown, ventricular resection model, FAK/Src chemical inhibitors, proteomics identification, EMT marker analysis\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined pathway inhibitors, model organism\",\n      \"pmids\": [\"26156497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Spindle-associated RHAMM regulates oriented (planar) division of testicular germ cells. RHAMM loss-of-function (caused by downregulation of CFIm25-mediated polyadenylation) dissociates RHAMM from the spindle, causes defective planar divisions, premature germ cell displacement, hypofertility, and seminoma. RHAMM association with the spindle was abolished in 96% of human seminomas.\",\n      \"method\": \"Mouse models, Hmmr immunostaining at spindle, human seminoma tissue analysis, CFIm25 knockdown, spindle orientation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with human tissue validation and defined molecular mechanism (CFIm25/RHAMM/spindle axis)\",\n      \"pmids\": [\"27543603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HMMR acts at centrosomes in a PLK1-dependent pathway to locate active Ran and modulate cortical NuMA-dynein complex localization for mitotic spindle positioning. Hmmr-knockout mice show neonatal lethality with defective neural development, and HMMR overexpression induces spindle orientation defects consistent with increased active Ran. This identifies HMMR as an essential regulator of progenitor cell division orientation.\",\n      \"method\": \"Hmmr-knockout mouse generation and analysis, HMMR overexpression in cancer cells, Ran activity assays, NuMA-dynein cortical localization analysis, spindle orientation measurements\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout mouse with multiple tissue phenotypes and molecular pathway (PLK1-Ran-NuMA-dynein) defined\",\n      \"pmids\": [\"28994651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RHAMM acts as a co-activator in the nuclear transcription complex and also functions intracellularly to regulate ERK1/2 activation and MMP-9 expression in a cell-type-specific manner during wound repair. In fibroblasts, RHAMM promotes ERK1/2 activation and MMP-9 expression; in keratinocytes, RHAMM suppresses these activities. Loss of RHAMM in keratinocytes promotes EGFR-regulated MMP-9 expression via ERK1/2, causing CD44 ectodomain cleavage and increased keratinocyte motility.\",\n      \"method\": \"Rhamm-null mouse excisional wound model, ERK1/2 phosphorylation assays, MMP-9 expression analysis, CD44 ectodomain shedding assay, cell-specific migration assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout mouse with cell-type-specific molecular mechanism defined across multiple readouts\",\n      \"pmids\": [\"32165498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BACH1 phosphorylation during mitosis promotes its interaction with HMMR (and CRM1) to stabilize mitotic spindle orientation. This interaction requires mitosis-specific phosphorylation of BACH1 (identified by SILAC mass spectrometry); mutation of these phosphorylation sites abolishes BACH1-HMMR interaction and spindle orientation rescue activity.\",\n      \"method\": \"SILAC mass spectrometry of BACH1 complexes, co-immunoprecipitation, phosphorylation-site mutagenesis, spindle orientation assay, BACH1 knockdown rescue experiments\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified phosphorylation with co-IP and mutant rescue, single lab\",\n      \"pmids\": [\"29459360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The RHAMMB isoform (lacking a 15-amino-acid stretch present in RHAMMA) promotes PNET liver metastasis via EGFR signaling; EGFR knockdown abolishes RHAMMB-driven metastasis. RHAMMA does not promote metastasis. RHAMMB expression correlates with higher EGFR expression in pancreatic ductal adenocarcinoma.\",\n      \"method\": \"RNA-Seq isoform analysis, in vivo spontaneous and experimental metastasis mouse models, EGFR knockdown, tumor growth assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo isoform-specific functional studies with EGFR epistasis, single lab\",\n      \"pmids\": [\"31072393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD44/RHAMM complex formation is upregulated when cells interact with immobilized (but not soluble) hyaluronan, as demonstrated by FRET microscopy and co-immunoprecipitation. Expression of both CD44 and RHAMM is regulated via HA interactions in a cell-specific feedback loop.\",\n      \"method\": \"FRET microscopy, co-immunoprecipitation, immunocytochemistry in breast cancer cell lines with soluble vs. immobilized HA\",\n      \"journal\": \"Acta biomaterialia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FRET and co-IP showing complex formation under defined HA presentation conditions\",\n      \"pmids\": [\"33091625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HMMR overexpression in mouse mammary epithelium increases BRCA1-mutant tumorigenesis by activating AURKA and reducing ARPC2 localization at the mitotic cell cortex, leading to micronucleation and activation of cGAS-STING and non-canonical NF-κB signaling, with downstream epithelial-to-mesenchymal transition and tumor-associated macrophage infiltration.\",\n      \"method\": \"HMMR-overexpressing transgenic mouse mammary model with Brca1 mutation, AURKA activity assays, ARPC2 cortical localization immunofluorescence, cGAS-STING pathway analysis, tumor microenvironment profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic mouse model with molecular pathway (AURKA/ARPC2/cGAS-STING/NF-κB) defined by multiple approaches\",\n      \"pmids\": [\"35393420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HMMR alleviates ER stress by promoting autophagic lysosomal activity in hepatocellular carcinoma. Under ER stress, HMMR is transcriptionally induced by CHOP and degraded by TRIM29-mediated ubiquitination. Mechanistically, HMMR controls the intensity of ER stress by regulating autophagy.\",\n      \"method\": \"HBV-transgenic mouse model, luciferase reporter (CHOP on HMMR promoter), ChIP, co-immunoprecipitation, immunoprecipitation, ubiquitination assay, autophagy/ER stress marker analysis\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and co-IP with ubiquitination assay identifying writer (TRIM29) and transcription factor (CHOP), single lab\",\n      \"pmids\": [\"37405956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HMMR interacts with AURKA and stabilizes AURKA protein by inhibiting its ubiquitination-mediated degradation, which subsequently activates the mTORC2/AKT pathway in prostate cancer. Activated mTORC2/AKT induces E2F1, which transcriptionally promotes HMMR expression, forming a positive feedback loop. mTOR inhibition partially antagonizes HMMR-mediated tumor progression in vivo.\",\n      \"method\": \"Co-immunoprecipitation (HMMR-AURKA), ubiquitination assay, gain/loss-of-function experiments, mTOR inhibitor in vivo, transcription factor (E2F1) promoter analysis\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with ubiquitination assay and in vivo pharmacological validation, single lab\",\n      \"pmids\": [\"36750558\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HMMR/RHAMM is a multifunctional protein that operates both extracellularly as a hyaluronan receptor (binding HA via conserved C-terminal B(X7)B motifs to activate ERK1/2, FAK, Src, PI3K-Rac, and Rho-ROCK signaling pathways promoting cell motility) and intracellularly as a microtubule-associated, centrosomal scaffold protein that recruits ERK1/2-MEK1 complexes to stabilize spindle microtubules, interacts with dynein, localizes Aurora kinase A activity via TPX2, and acts in a PLK1-dependent pathway to orient the mitotic spindle; its expression is transcriptionally controlled by p53 (repression) and YAP/TEAD (activation), and post-translationally it stabilizes AURKA from ubiquitin-mediated degradation while being itself subject to TRIM29-mediated ubiquitination under ER stress.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HMMR/RHAMM is a multifunctional scaffold protein that operates both as an extracellular hyaluronan receptor driving cell motility and as an intracellular centrosomal/spindle-associated protein essential for mitotic spindle assembly, orientation, and integrity. Extracellularly, HMMR binds hyaluronan through C-terminal B(X7)B motifs and activates ERK1/2, FAK, Src, and PI3K-Rac signaling cascades to promote cell migration, adhesion, and focal adhesion turnover, functioning downstream of H-Ras [PMID:7682552, PMID:7508860, PMID:7541721, PMID:16934786, PMID:21914806]. Intracellularly, HMMR associates with microtubules, centrosomes, and dynein via its C-terminal domain, scaffolds an ERK1/2-MEK1-tubulin complex to regulate interphase microtubule dynamics and spindle architecture, localizes TPX2 to activate AURKA, and participates in a PLK1-Ran-NuMA-dynein pathway that orients the mitotic spindle in progenitor cells [PMID:12808028, PMID:20558733, PMID:24875404, PMID:28994651]. HMMR transcription is repressed by p53, activated by YAP/TEAD and E2F1, and peaks at S/G2-M; the protein stabilizes AURKA from ubiquitin-mediated degradation and is itself targeted for degradation by TRIM29-mediated ubiquitination under ER stress [PMID:18971636, PMID:24367099, PMID:36750558, PMID:37405956].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Identification of the HA-binding mechanism resolved how HMMR recognizes its principal extracellular ligand: two C-terminal B(X7)B motifs are necessary and sufficient for hyaluronan binding, a motif shared with CD44 and link protein.\",\n      \"evidence\": \"GST-fusion truncations, site-directed mutagenesis of basic residues, HA-Sepharose binding, chimeric protein construction\",\n      \"pmids\": [\"7682552\", \"7508860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of HA-RHAMM interaction unresolved\", \"Relative contribution of each B(X7)B motif in vivo unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing HMMR as a Ras-pathway effector that promotes transformation and metastasis answered whether HMMR had oncogenic capacity and placed it genetically downstream of H-Ras, upstream of FAK-dependent focal adhesion turnover.\",\n      \"evidence\": \"Overexpression/antisense/dominant-negative RHAMM in fibroblasts, ras-transformed fibrosarcoma reversion, in vivo tumorigenesis, FAK phosphorylation\",\n      \"pmids\": [\"7541721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding partner linking Ras to RHAMM not identified\", \"Mechanism of cell-surface vs. intracellular RHAMM contribution to transformation unclear\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Discovery that intracellular RHAMM isoforms scaffold MEK1-ERK1/2 complexes revealed a non-receptor signaling role, explaining how RHAMM activates ERK independently of cell-surface ligand engagement.\",\n      \"evidence\": \"Co-immunoprecipitation of RHAMMv4 with MEK1/ERK, dominant-negative epistasis, constitutive ERK activation upon overexpression\",\n      \"pmids\": [\"9556628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and regulation of the RHAMM-MEK1-ERK complex undetermined\", \"Whether intracellular HA binding modulates this scaffolding function unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating direct microtubule binding via an N-terminal domain established HMMR as a bona fide microtubule-associated protein, linking its intracellular pool to cytoskeletal regulation beyond signaling scaffold roles.\",\n      \"evidence\": \"GFP-fusion localization, in vitro microtubule-binding assays, deletion mutagenesis, calmodulin affinity chromatography\",\n      \"pmids\": [\"10547355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether microtubule binding and HA binding are mutually exclusive or concurrent unknown\", \"Role of calmodulin binding in regulating HMMR-microtubule interaction not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Localization of HMMR to centrosomes and identification of its interaction with dynein through a C-terminal Xklp2-like domain established HMMR as a centrosomal protein required for mitotic spindle integrity.\",\n      \"evidence\": \"Co-IP of dynein IC, deletion mapping of centrosomal targeting domain, HMMR depletion/overexpression spindle phenotypes\",\n      \"pmids\": [\"12808028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether dynein interaction is direct or bridged by adaptor proteins unresolved\", \"Regulation of HMMR centrosomal recruitment mechanism unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that cell-surface RHAMM and CD44 form a ternary complex with ERK1/2 in invasive breast cancer cells explained how co-receptor assembly sustains high basal motility signaling in aggressive cancers.\",\n      \"evidence\": \"Reciprocal co-IP, confocal co-localization, antibody blocking and MEK1 inhibitor in MDA-MB-231 cells\",\n      \"pmids\": [\"17392272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the complex requires direct RHAMM-CD44 contact or is bridged by HA uncertain\", \"Structural determinants of receptor complex assembly unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Using RHAMM-knockout MEFs to show that RHAMM controls interphase microtubule dynamics and spindle bipolarity through MEK1/ERK1/2, and mapping its direct ERK1 D-site and tubulin leucine-zipper binding domains, unified its scaffolding and cytoskeletal functions into a single mechanistic model.\",\n      \"evidence\": \"RHAMM−/− MEF rescue with RHAMM or constitutively active MEK1, co-IP/pulldown of RHAMM-ERK1-tubulin complex, D-site mutation\",\n      \"pmids\": [\"20558733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RHAMM directly activates MEK1 or merely co-localizes it with substrates undetermined\", \"Contribution of intracellular HA to this pathway untested in knockout system\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of YAP/TEAD as a direct transcriptional activator of HMMR downstream of the mevalonate-Rho pathway provided the first link between Hippo pathway output and HMMR-dependent cell invasion, explaining how metabolic cues regulate HMMR levels.\",\n      \"evidence\": \"ChIP of TEAD on HMMR promoter, reporter assays, simvastatin and RhoA inhibition, in vivo migration assays\",\n      \"pmids\": [\"24367099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p53 and YAP/TEAD compete at the HMMR promoter uncharacterized\", \"Chromatin-level regulation of HMMR transcription not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing that HMMR forms a complex with TPX2 and is required for spatial activation of AURKA at centrosomal and kinetochore-proximal sites resolved how HMMR contributes to spindle assembly kinetics and length control.\",\n      \"evidence\": \"Co-IP of RHAMM-TPX2, domain mapping (C-terminal basic leucine zipper), AURKA kinase activity assay, siRNA spindle phenotype\",\n      \"pmids\": [\"24875404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HMMR directly activates AURKA or acts solely through TPX2 localization unclear\", \"Regulation of HMMR-TPX2 complex formation during cell cycle not mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Generation of Hmmr-knockout mice revealed neonatal lethality with neural defects and established that HMMR operates in a PLK1-dependent pathway controlling Ran activity and cortical NuMA-dynein to orient mitotic spindles in progenitor cells.\",\n      \"evidence\": \"Hmmr-knockout mouse phenotyping, Ran activity assays, NuMA-dynein cortical localization, spindle orientation measurements\",\n      \"pmids\": [\"28994651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PLK1 regulates HMMR (phosphorylation sites, binding) not biochemically defined\", \"Whether spindle orientation defects fully account for neonatal lethality unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Transgenic HMMR overexpression in BRCA1-mutant mammary epithelium demonstrated that excess HMMR drives tumorigenesis through AURKA hyperactivation, ARPC2 mislocalization, micronucleation, and consequent cGAS-STING/NF-κB inflammatory signaling, connecting spindle defects to the tumor microenvironment.\",\n      \"evidence\": \"HMMR-overexpressing Brca1-mutant transgenic mouse, AURKA activity, ARPC2 immunofluorescence, cGAS-STING pathway and macrophage profiling\",\n      \"pmids\": [\"35393420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cGAS-STING activation is a direct consequence of micronuclei or involves additional HMMR-dependent signals untested\", \"Therapeutic window for AURKA inhibition in HMMR-high tumors undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two studies expanded HMMR's post-translational regulation: HMMR stabilizes AURKA by inhibiting its ubiquitination (forming an HMMR-AURKA-mTORC2-AKT-E2F1 feedback loop), and HMMR itself is degraded by TRIM29-mediated ubiquitination under ER stress while promoting autophagy-lysosome activity.\",\n      \"evidence\": \"Co-IP of HMMR-AURKA, ubiquitination assays, mTOR inhibitor in vivo, CHOP ChIP on HMMR promoter, TRIM29 ubiquitination assay\",\n      \"pmids\": [\"36750558\", \"37405956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the E3 ligase whose activity on AURKA is blocked by HMMR unknown\", \"Whether TRIM29-mediated degradation of HMMR operates outside ER stress contexts untested\", \"Feedback loop components not validated in non-cancer cell types\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of HMMR's multivalent interactions (HA, tubulin, TPX2, dynein, ERK), how isoform-specific functions are partitioned between extracellular and intracellular pools in vivo, and whether HMMR's spindle and signaling functions are mechanistically coupled or independently regulated.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of HMMR or its complexes\", \"Isoform-specific knockout models not available\", \"Relationship between HA-binding and spindle functions not experimentally dissected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 17, 25]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 11, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [25, 36]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 11, 17]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [11, 25, 29]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 14, 33]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 5, 7, 13, 14, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 16, 17, 25, 29]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [3, 13, 33]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [22, 26]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [35]}\n    ],\n    \"complexes\": [\n      \"RHAMM-CD44-ERK1/2 surface signaling complex\",\n      \"RHAMM-MEK1-ERK1/2-tubulin intracellular complex\",\n      \"RHAMM-TPX2-AURKA spindle complex\"\n    ],\n    \"partners\": [\n      \"CD44\",\n      \"AURKA\",\n      \"TPX2\",\n      \"MAPK3\",\n      \"MAP2K1\",\n      \"DYNC1I2\",\n      \"SRC\",\n      \"BACH1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}