{"gene":"HSPA6","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1990,"finding":"HSPA6 (HSP70B') encodes a novel stress-inducible 70 kDa protein that binds ATP, consistent with chaperone function. It has little or no basal expression and is induced only at higher temperatures compared to the major inducible HSP70.","method":"cDNA isolation, hybrid-selected translation, Northern blot, S1 nuclease protection, ATP-binding assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 1 (in vitro ATP-binding assay) / Weak — single lab, foundational characterization but no mutagenesis or reconstitution of chaperone activity","pmids":["2327978"],"is_preprint":false},{"year":1992,"finding":"HSPA6 maps to human chromosome 1q and is expressed as an mRNA only upon heat stress, with no basal expression detectable.","method":"Somatic cell hybrid panel hybridization, Northern blot with specific oligonucleotides","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chromosomal localization and expression confirmed by two orthogonal methods in single lab","pmids":["1346391"],"is_preprint":false},{"year":2001,"finding":"The HSP70B (HSPA6) promoter is repressed at 37°C by three independent mechanisms: (1) NFIL6 displaces HSF1 from the heat shock element (HSE) independently of Ku70; (2) Ku70 binds HSF1 and displaces it from the HSE in vitro; (3) MAPK/GSK3-mediated phosphorylation of HSF1 at Ser303/Ser307 contributes independently. In Ku-deficient cells, HSF1 activation of the HSP70B promoter is greatly enhanced.","method":"Promoter reporter assays, HSF1 mutant analysis, in vitro translated Ku70 binding/displacement assay, Ku-deficient cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches in single lab including in vitro binding assay and genetic (Ku-deficient) epistasis","pmids":["11162511"],"is_preprint":false},{"year":2006,"finding":"Ha-Ras(val12) induces HSPA6 (HSP70b) transcription via heat shock elements (HSEs) in an HSF1-dependent manner. Stable Ha-ras(val12)-transformed cells, however, suppress HSPA6 expression, correlating with increased sensitivity to heat shock.","method":"Transient transfection of HSP70b promoter-reporter constructs, systematic deletions and point mutations, HSF1-/- cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutational analysis plus genetic (HSF1-knockout) epistasis, single lab","pmids":["16278678"],"is_preprint":false},{"year":2007,"finding":"siRNA knockdown of HSPA6 (Hsp70B') sensitizes human colon cells to heat stress and proteasome inhibition, establishing a direct cytoprotective function. HSPA6 is a secondary stress responder relative to Hsp72, but ZnSO4 induces HSPA6 specifically (not Hsp72), indicating stressor-specific primary roles.","method":"siRNA knockdown, flow cytometry viability assay, promoter-GFP flow cytometry","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 2 / Strong — replicated across multiple cell lines, two orthogonal methods, confirmed in two independent publications (PMID 18229458 and 17915554)","pmids":["17915554","18229458"],"is_preprint":false},{"year":2007,"finding":"HSPA6 (Hsp70B') expression is cell-number-dependent, being optimally induced at low cell numbers. Medium conditioned from low-cell-number cultures promotes Hsp70B' promoter activation in high-cell-number cultures, indicating an extracellular regulator. This regulation is not explained by changes in HSF-1 DNA-binding activity or hyperphosphorylation.","method":"Flow cytometry using Hsp70B' promoter-driven GFP construct, conditioned medium transfer experiments, HSF-1 EMSA","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (promoter-GFP, conditioned medium, EMSA) in single lab","pmids":["17044073"],"is_preprint":false},{"year":2008,"finding":"HSPA6 (Hsp70B') forms a complex with Hsp72 and the co-chaperone HOP following heat stress in human colon cells. siRNA knockdown of either Hsp70B' or Hsp72 severely impairs acquisition of cytoprotection, supporting cooperative roles in cell survival.","method":"Co-immunoprecipitation, siRNA knockdown, flow cytometry viability assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal-style Co-IP plus functional siRNA knockdown, single lab","pmids":["18579131"],"is_preprint":false},{"year":2008,"finding":"HSPA6 (Hsp70B') is expressed on the cell surface in response to proteasome inhibition (but not heat shock) in certain human colon cell lines. Phylogenetic analysis indicates that Hsp70B' and Hsp72 share 100% identity in their predicted peptide-binding regions, suggesting they bind the same substrates, while sequence differences in lid and C-terminal domains suggest different co-chaperone or receptor interactions.","method":"Flow cytometry for surface expression, phylogenetic sequence analysis","journal":"Cell stress & chaperones","confidence":"Low","confidence_rationale":"Tier 3 / Weak — flow cytometry localization in single lab; sequence analysis is computational; no direct co-chaperone binding experiment","pmids":["18347947"],"is_preprint":false},{"year":2010,"finding":"HSPA6 (Hsp70B') forms heteromeric complexes with Hsp70, Hsc70, and Hsp40 in differentiated human neuronal cells, detected by co-immunoprecipitation.","method":"Co-immunoprecipitation from differentiated SH-SY5Y human neuronal cells","journal":"Cell stress & chaperones","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP method, single lab, no reciprocal pulldown described","pmids":["20084477"],"is_preprint":false},{"year":2010,"finding":"In macrophages, oxLDL immune complexes (oxLDL-IC) induce synthesis and release of HSPA6 (HSP70B'). Released HSP70B' co-localizes with cell-associated and internalized lipid moiety of oxLDL-IC. siRNA knockdown of HSP70B' decreased sphingosine kinase 1 (SK1) mRNA levels and SK1 phosphorylation, and increased IL-10 release, implicating HSPA6 in regulating SK1 activity and IL-10 secretion.","method":"Immunoblot, confocal fluorescence microscopy, HSP70B'-GFP transfection, siRNA knockdown, SK1 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (confocal, GFP-fusion, siRNA with downstream readouts) in single lab","pmids":["20348092"],"is_preprint":false},{"year":2013,"finding":"Following thermal stress, YFP-tagged HSPA6 (and HSPA1A) rapidly localizes to the proximal end of centrioles in differentiated human SH-SY5Y neuronal cells, with HSPA6 showing a more prolonged signal than HSPA1A.","method":"Live-cell fluorescence microscopy of YFP-tagged HSPA6 in stable cell lines, co-staining with γ-tubulin and centrin markers","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-cell imaging with marker co-localization in stable lines, single lab","pmids":["24061851"],"is_preprint":false},{"year":2014,"finding":"Following heat shock in differentiated human SH-SY5Y neuronal cells, YFP-HSPA6 localizes sequentially to nuclear speckles (SC35/SON-positive RNA splicing factor compartments), then the granular component of the nucleolus (nucleophosmin-positive), and subsequently to the periphery of nuclear speckles (perispeckles) that are sites of RNA transcription. This perispeckle localization is unique to HSPA6 and not observed for HSPA1A.","method":"Stable YFP-tagged HSPA6 expression in SH-SY5Y cells, confocal microscopy, co-localization with SC35, SON, and nucleophosmin markers","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-cell imaging with multiple validated compartment markers, single lab","pmids":["25319762"],"is_preprint":false},{"year":2014,"finding":"The HSPA6 promoter contains negative and positive regulatory regions across 3 kb. A region between -346 and -217 bp is critical for basal expression and stress inducibility. An AP1 site within this region contributes to basal expression and maximal stress induction. A newly characterized HSE in this region mediates heat-induced transcription but preferentially binds a stress-inducible factor other than HSF1 or HSF2 in HaCaT keratinocytes, yet binds both HSF1 and HSF2 from other epithelial cell extracts.","method":"Promoter 5' truncations and deletions, site-specific mutagenesis, DNA-binding (EMSA) studies, luciferase reporter assays","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — promoter deletion/mutagenesis plus EMSA, multiple orthogonal approaches, single lab","pmids":["25073946"],"is_preprint":false},{"year":2015,"finding":"HSPA6 is strongly and specifically induced by HSP90 inhibitors (17-AAG and Radicicol) in certain cancer cell lines. siRNA-mediated inhibition or recombinant overexpression of HSPA6 did not influence 17-AAG-mediated cell death, indicating HSPA6 is not required for this cytotoxic effect.","method":"qPCR, Western blot, siRNA knockdown, recombinant overexpression, cell viability assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (qPCR, Western blot, siRNA, OE) in single lab; negative result on cell death included","pmids":["25957766"],"is_preprint":false},{"year":2015,"finding":"eNOS-derived nitric oxide induces HSPA6 expression (~14-fold) in human coronary artery smooth muscle cells. Adenoviral overexpression of HSPA6 inhibits smooth muscle cell proliferation, paralleling the eNOS anti-proliferative effect.","method":"Adenoviral transduction (Ad-eNOS), whole-genome array, qPCR, immunoblotting, adenoviral HSPA6 overexpression, proliferation assay","journal":"Nitric oxide : biology and chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (array, qPCR, Western blot, functional OE assay) in single lab","pmids":["26656590"],"is_preprint":false},{"year":2016,"finding":"HSPA6 targeting to the periphery of nuclear speckles (perispeckles, transcription sites) after thermal stress is disrupted by the transcription inhibitor triptolide, which knocks down RNA polymerase II large subunit RPB1. This links HSPA6 perispeckle localization to active transcription and suggests a role in transcriptional recovery after neuronal stress.","method":"Confocal microscopy of YFP-HSPA6 in SH-SY5Y cells treated with triptolide, Western blot for RPB1","journal":"Neurochemical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological perturbation of transcription with localization readout provides functional link, single lab","pmids":["27743288"],"is_preprint":false},{"year":2016,"finding":"HSPA6 shows a more prolonged and dynamic association with stress-sensitive structures (centrioles, nuclear speckles, nucleolus, perispeckles) compared to HSPA1A, as measured by FRAP. The stress-induced association of HSPA6 with perispeckles (transcription sites) displays the greatest dynamism among all structures examined.","method":"Live-cell confocal microscopy and FRAP of YFP-tagged HSPA6 and HSPA1A in differentiated SH-SY5Y cells","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging plus quantitative FRAP, single lab","pmids":["27527722"],"is_preprint":false},{"year":2016,"finding":"HSPA6 co-immunoprecipitates with anti-apoptotic Bcl-XL in intestinal epithelial cells. Cigarette smoke extract (CSE) strongly induces HSPA6, which stabilizes Bcl-XL protein levels (without altering Bcl-XL mRNA), thereby protecting intestinal epithelial cells from apoptosis.","method":"Immunoprecipitation, Q-PCR, Western blotting, immunofluorescence microscopy","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus mRNA/protein dissociation providing mechanistic stabilization evidence, single lab","pmids":["26826017"],"is_preprint":false},{"year":2017,"finding":"siRNA knockdown of HSPA6 and HSPA1A in differentiated human SH-SY5Y neuronal cells abolishes the protective effect of co-applied celastrol/arimoclomol against heat shock, establishing that both HSPs contribute to protection of human neuronal cells from thermal stress.","method":"siRNA knockdown, cell viability assay after heat shock, celastrol/arimoclomol co-treatment","journal":"Neurochemical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean siRNA knockdown with specific pharmacological/thermal stress phenotype, single lab","pmids":["29090408"],"is_preprint":false},{"year":2017,"finding":"After heat shock in differentiated human neuronal cells, HSPA6 targets the periphery of nuclear speckles (perispeckles/transcription sites) but does NOT co-localize with DNAJB1 (Hsp40-1) or HSPH1 (Hsp105α) at this site. At 3 h post-heat shock, HSPA6 co-localizes with DNAJB1 and HSPH1 at the granular component of the nucleolus. By contrast, HSPA1A and HSPA8 co-localize with these disaggregation machine components at nuclear speckles immediately after heat shock.","method":"Confocal microscopy of YFP-tagged HSPA6 with co-staining for DNAJB1, HSPH1, DNAJA1, and BAG-1 in differentiated SH-SY5Y cells","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic co-localization with multiple validated markers, single lab","pmids":["28484369"],"is_preprint":false},{"year":2018,"finding":"Sulfur mustard (SM)-induced HSPA6 protein upregulation is mediated through TRPA1 ion channel activation. Pre-treatment with the specific TRPA1 inhibitor AP18 diminishes SM-induced HSPA6 upregulation, establishing TRPA1 as an upstream regulator.","method":"2D gel electrophoresis proteomics, MALDI-TOF mass spectrometry, RT-qPCR, TRPA1 inhibitor (AP18) treatment in TRPA1-overexpressing HEK cells and endogenous A549 cells","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics identification plus pharmacological epistasis with inhibitor in two cell lines, single lab","pmids":["30200301"],"is_preprint":false},{"year":2023,"finding":"HSPA6 impedes IFN-β production by blocking the interaction between TRAF3 and IKKε, thereby suppressing antiviral innate immune signaling. This function is exploited by PRRSV through virus-induced lactylation, which transcriptionally activates HSPA6.","method":"CUT&Tag combined with RNA-seq, co-immunoprecipitation (TRAF3-IKKε interaction), siRNA knockdown, overexpression, IFN-β reporter assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mechanistic dissection using CUT&Tag+RNA-seq for upstream regulation, Co-IP for TRAF3-IKKε disruption, and functional IFN-β assays; multiple orthogonal methods in single rigorous study","pmids":["38088561"],"is_preprint":false},{"year":2025,"finding":"HSPA6 binds to NF-κB p65 and inhibits its nuclear translocation and Ser468 phosphorylation, suppressing transcription of lipogenic enzyme FASN and downregulating LPCAT1/cPLA2, which enriches membrane phospholipids with polyunsaturated fatty acids and promotes ferroptosis in triple-negative breast cancer cells. Concurrently, HSPA6-mediated suppression of lipogenesis depletes palmitate, impairing ANKIB1 palmitoylation and inhibiting ANKIB1 E3 ligase-mediated K48-linked ubiquitination of HSPA6, forming a stabilizing feedback loop.","method":"Co-IP (HSPA6-p65 binding), nuclear fractionation, Western blot for p65 phosphorylation, FASN/LPCAT1/cPLA2 expression, lipid peroxidation assays, ANKIB1 palmitoylation assay, ubiquitination assay","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, fractionation, lipid assays, ubiquitination) in single lab; peer-reviewed but newly published","pmids":["42088412"],"is_preprint":false},{"year":2025,"finding":"HSPA6 is induced by RIG-I-like receptor (RLR) activation and acts as a negative regulator of type-I interferon signaling. HSPA6 induction is independent of MAVS or IRF3 but depends on E3 ligases associated with RLRs, stress granules, and transcription factors IRF1 and AP-1. HSPA6 binds to RIG-I and MDA5 in the cytoplasm and disrupts their multimer complex formation.","method":"Co-immunoprecipitation (HSPA6-RIG-I/MDA5 binding), Western blot, RLR multimer assay, genetic epistasis (MAVS-/-, IRF3-/-, IRF1 knockdown, AP-1 inhibition), IFN-β reporter assay","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus epistasis experiments across multiple pathway components, single lab","pmids":["41762233"],"is_preprint":false},{"year":2025,"finding":"TRIM35 directly binds the HSPA6 promoter, catalyzes non-proteolytic ubiquitination of histone H3, which recruits p300 to mediate H3K27 acetylation, thereby activating HSPA6 transcription. This epigenetic mechanism underlies TRIM35's tumor-suppressive effect in breast cancer that is mediated through HSPA6 upregulation.","method":"ChIP (TRIM35 promoter binding), co-immunoprecipitation (TRIM35-H3 interaction), H3 ubiquitination assay, H3K27 acetylation assay, p300 recruitment assay, siRNA knockdown, reporter assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP, Co-IP, histone modification assays provide multi-method mechanistic chain, single lab","pmids":["41136372"],"is_preprint":false},{"year":2026,"finding":"HSPA6 interacts with IMPDH2, a rate-limiting enzyme in purine biosynthesis, and promotes GTP synthesis to drive radioresistance in glioblastoma stem cells. Mechanistically, HSPA6 recruits ROCK2 kinase to phosphorylate IMPDH2 at S416, activating it. Combined pharmacological inhibition of HSPA6 and IMPDH2 with irradiation significantly improves survival in GBM mouse models.","method":"Co-immunoprecipitation (HSPA6-IMPDH2, HSPA6-ROCK2), IMPDH2 phosphorylation assay (S416), GTP synthesis assay, siRNA knockdown, in vivo mouse GBM model, pharmacological inhibition","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus enzymatic assay plus in vivo model with specific phospho-site; multiple orthogonal methods in single lab","pmids":["42234559"],"is_preprint":false},{"year":2026,"finding":"Lactate-induced H3K18 lactylation at the HSPA6 locus transcriptionally activates HSPA6 expression during renal ischemia-reperfusion injury. Elevated HSPA6 then promotes cuproptosis and worsens renal damage. Knockdown of HSPA6 suppresses OGD/R-induced cuproptosis.","method":"Multi-omics (proteomics, CUT&Tag, RNA-seq), ChIP-qPCR (H3K18la at HSPA6 locus), LDHA inhibition, HSPA6 knockdown, in vivo IRI mouse model","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CUT&Tag chromatin profiling plus ChIP-qPCR directly at HSPA6 locus plus functional knockdown, single lab","pmids":["41616844"],"is_preprint":false},{"year":2025,"finding":"BARX1 transcription factor directly activates HSPA6 transcription, as confirmed by dual-luciferase reporter assay with BARX1 binding to the HSPA6 promoter. HSPA6 knockdown attenuates BARX1-induced osteosarcoma cell proliferation and migration.","method":"RNA sequencing after BARX1 overexpression, dual-luciferase reporter assay, siRNA knockdown, proliferation and migration assays, dual immunofluorescence","journal":"Journal of orthopaedic surgery and research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter reporter assay plus siRNA epistasis, single lab","pmids":["36927457"],"is_preprint":false},{"year":2025,"finding":"CAIX overexpression activates HSPA6 expression through the AMPK signaling pathway in osteosarcoma cells, promoting cell migration and invasion. Pharmacological AMPK inhibition (dorsomorphin) suppresses CAIX-induced HSPA6 expression and metastasis. HSPA6 knockdown reduces CAIX-driven migration and invasion.","method":"CAIX overexpression, siRNA knockdown of HSPA6, Western blot for AMPK phosphorylation, AMPK inhibitor (dorsomorphin), migration/invasion assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis plus siRNA knockdown with functional readouts, single lab","pmids":["40765077"],"is_preprint":false},{"year":2025,"finding":"ZT-22, a benzofuran derivative of β-elemene, directly binds HSPA6 protein. This binding activates the p38 MAPK signaling pathway and inhibits HCC cell growth. HSPA6 knockdown diminishes p38 MAPK signaling and reverses ZT-22 anti-HCC effects.","method":"DARTS combined with mass spectrometry for target identification; CETSA, SPR, microscale thermophoresis (MST), molecular docking, molecular dynamics simulations for binding validation; siRNA knockdown with p38 MAPK readout","journal":"Chemico-biological interactions","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding confirmed by four independent biophysical/biochemical methods (DARTS-MS, CETSA, SPR, MST) plus functional siRNA epistasis; single paper but multiple orthogonal high-quality methods","pmids":["40239884"],"is_preprint":false},{"year":2025,"finding":"HSPB6 directly interacts with HSPA6 (detected by immunoprecipitation mass spectrometry), and HSPB6 overexpression inhibits the JNK-JUND signaling axis downstream of HSPA6, suppressing colorectal cancer progression.","method":"Immunoprecipitation mass spectrometry, Western blot, RNA sequencing, in vivo tumor model","journal":"Life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single IP-MS experiment for HSPB6-HSPA6 interaction; HSPA6's role in JNK-JUND axis inferred from HSPB6's effect on HSPA6 in single lab","pmids":["41043501"],"is_preprint":false},{"year":2025,"finding":"CITED2 binds EP300 and regulates HSPA6 gene expression; CITED2 knockdown in human spermatogonial stem cell lines significantly inhibits proliferation and increases apoptosis, and overexpression of HSPA6 rescues these effects, placing HSPA6 downstream of the CITED2-EP300 complex via the MAPK pathway.","method":"siRNA knockdown, RNA sequencing, immunoprecipitation (CITED2-EP300), HSPA6 overexpression rescue assay","journal":"Stem cells international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus RNA-seq plus epistatic rescue experiment, single lab","pmids":["40313859"],"is_preprint":false},{"year":2025,"finding":"ATF3 binds the HSPA6 promoter to activate its transcription downstream of PERP upregulation. PERP overexpression suppresses breast cancer metastasis, and knockdown of ATF3 or HSPA6 eliminates this antimetastatic effect, establishing a PERP-ATF3-HSPA6 axis.","method":"Chromatin immunoprecipitation (ATF3 at HSPA6 promoter), siRNA knockdown, RNA-seq, Western blot, RT-qPCR, migration/invasion assays, in vivo metastasis model","journal":"The Journal of international medical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding plus functional epistasis siRNA experiments, single lab","pmids":["41456178"],"is_preprint":false}],"current_model":"HSPA6 (HSP70B') is a strictly stress-inducible human HSP70 chaperone (absent in mice/rats) with an N-terminal ATP/nucleotide-binding domain and C-terminal substrate-binding domain; it is transcriptionally activated by heat shock elements (HSF1-dependent), AP-1, IRF1, HSP90 inhibition, proteasome inhibition, eNOS-derived NO, and epigenetic modifications (H3K18 lactylation, TRIM35-mediated H3K27ac); it forms heteromeric complexes with Hsp72, Hsc70, HOP, and Hsp40 to cooperatively protect cells from proteotoxic stress; it localizes sequentially after thermal stress to centrioles, nuclear speckles, nucleolus, and perispeckle transcription sites; it negatively regulates antiviral innate immunity by disrupting RIG-I/MDA5 multimerization and blocking TRAF3-IKKε interaction to suppress IFN-β; it directly binds NF-κB p65 to modulate lipid metabolism and ferroptosis; it activates IMPDH2 via ROCK2-mediated S416 phosphorylation to promote GTP synthesis and radioresistance; and it stabilizes Bcl-XL protein and regulates sphingosine kinase 1 activity in macrophages."},"narrative":{"mechanistic_narrative":"HSPA6 (HSP70B') is a strictly stress-inducible 70 kDa HSP70-family chaperone that binds ATP and provides cytoprotection against proteotoxic insults [PMID:2327978, PMID:17915554, PMID:18229458]. It has little or no basal expression and is transcribed only upon strong stress, downstream of heat shock elements engaging HSF-family factors together with an AP1 element [PMID:1346391, PMID:25073946], and is additionally induced by HSP90 inhibition, proteasome inhibition, eNOS-derived nitric oxide, oncogenic Ha-Ras, TRPA1 activation, and a range of transcriptional and epigenetic inputs (BARX1, ATF3, CITED2-EP300, TRIM35-driven H3K27ac, and histone lactylation) [PMID:16278678, PMID:25957766, PMID:26656590, PMID:30200301, PMID:41136372, PMID:41616844, PMID:36927457, PMID:41456178]. As a chaperone it cooperates with the HSP70 machinery, forming heteromeric complexes with Hsp72, Hsc70, HOP, and Hsp40, where knockdown of either HSPA6 or Hsp72 abolishes acquired cytoprotection [PMID:18579131, PMID:20084477]. After thermal stress HSPA6 redistributes sequentially to centrioles, nuclear speckles, the nucleolar granular component, and the periphery of nuclear speckles (perispeckles), a transcription-site localization that is unique to HSPA6 and dependent on active RNA polymerase II, implicating it in transcriptional recovery [PMID:24061851, PMID:25319762, PMID:27743288]. Beyond canonical chaperone roles, HSPA6 acts as a negative regulator of antiviral type-I interferon signaling by binding RIG-I and MDA5 to disrupt their multimerization and by blocking the TRAF3-IKKε interaction to suppress IFN-β [PMID:38088561, PMID:41762233]. It also engages disease-relevant effector pathways: it binds and stabilizes anti-apoptotic Bcl-XL [PMID:26826017], binds NF-κB p65 to suppress lipogenesis and promote ferroptosis through a palmitoylation-dependent feedback loop with ANKIB1 [PMID:42088412], and recruits ROCK2 to phosphorylate and activate IMPDH2 (S416), driving GTP synthesis and radioresistance [PMID:42234559].","teleology":[{"year":1990,"claim":"Established HSPA6 as a distinct, highly stress-inducible HSP70 paralog with ATP-binding capacity, setting the expectation of chaperone function.","evidence":"cDNA isolation, hybrid-selected translation, Northern blot, and ATP-binding assay","pmids":["2327978"],"confidence":"Medium","gaps":["No direct reconstitution of chaperone/refolding activity","No mutagenesis of the nucleotide-binding domain"]},{"year":1992,"claim":"Mapped HSPA6 to chromosome 1q and confirmed its expression is restricted to heat stress with no detectable basal mRNA, defining its tight stress-gating.","evidence":"Somatic cell hybrid panel hybridization and Northern blot","pmids":["1346391"],"confidence":"Medium","gaps":["No information on tissue-specific induction thresholds"]},{"year":2014,"claim":"Dissected how the HSPA6 promoter is held silent at 37°C and activated under stress, identifying HSE and AP1 elements and HSF1 regulation by repressors (NFIL6, Ku70) and inducers (Ha-Ras).","evidence":"Promoter reporter/truncation/mutagenesis assays, EMSA, HSF1-null and Ku-deficient cells","pmids":["11162511","16278678","25073946"],"confidence":"Medium","gaps":["Identity of the non-HSF1 stress-inducible HSE-binding factor in keratinocytes unresolved","Extracellular regulator of cell-number-dependent induction not identified"]},{"year":2008,"claim":"Demonstrated that HSPA6 is functionally cytoprotective and acts cooperatively within the HSP70 chaperone network rather than in isolation.","evidence":"siRNA knockdown with viability assays plus Co-IP with Hsp72, Hsc70, HOP, and Hsp40","pmids":["17915554","18229458","18579131","20084477"],"confidence":"Medium","gaps":["Substrate repertoire and co-chaperone selectivity not defined","Co-IPs from single labs without reciprocal validation for some partners"]},{"year":2016,"claim":"Defined a unique HSPA6 stress-relocalization itinerary culminating at transcription sites, linking the chaperone to transcriptional recovery after stress.","evidence":"Live-cell confocal microscopy, FRAP, marker co-localization, and triptolide perturbation in SH-SY5Y cells","pmids":["24061851","25319762","27743288","27527722","28484369"],"confidence":"Medium","gaps":["Molecular cargo or function at perispeckles not identified","Mechanism distinguishing HSPA6 from HSPA1A targeting unknown"]},{"year":2023,"claim":"Revealed a non-chaperone role: HSPA6 suppresses antiviral type-I interferon signaling, identifying a host factor exploited by pathogens.","evidence":"CUT&Tag+RNA-seq, Co-IP of TRAF3-IKKε, siRNA/overexpression, and IFN-β reporter assays","pmids":["38088561"],"confidence":"High","gaps":["Structural basis of TRAF3-IKKε disruption not resolved","Whether chaperone activity is required for this function unknown"]},{"year":2025,"claim":"Extended HSPA6's immune-suppressive role upstream to the receptor level, showing it binds RIG-I and MDA5 to block their multimerization.","evidence":"Co-IP of HSPA6 with RIG-I/MDA5, RLR multimer assay, and genetic epistasis (MAVS-/-, IRF3-/-, IRF1, AP-1)","pmids":["41762233"],"confidence":"Medium","gaps":["Binding interface on RIG-I/MDA5 not mapped","Relationship to the TRAF3-IKKε mechanism not integrated"]},{"year":2026,"claim":"Connected HSPA6 to effector pathways in cancer—apoptosis, lipid metabolism/ferroptosis, and purine biosynthesis—showing direct binding partners that it stabilizes, sequesters, or activates.","evidence":"Co-IP (Bcl-XL, NF-κB p65, IMPDH2, ROCK2), phospho-site mapping (IMPDH2 S416), lipid/ferroptosis and ubiquitination assays, in vivo GBM model","pmids":["26826017","42088412","42234559"],"confidence":"Medium","gaps":["Whether these interactions reflect chaperone holding versus dedicated scaffolding is unclear","Most mechanisms from single labs without independent replication"]},{"year":2026,"claim":"Identified additional transcriptional/epigenetic inducers (BARX1, ATF3, CITED2-EP300, TRIM35-H3K27ac, histone lactylation) coupling HSPA6 induction to proliferation, metastasis, ferroptosis, and cuproptosis outcomes.","evidence":"ChIP, reporter assays, histone modification assays, siRNA/rescue, and in vivo tumor/IRI models","pmids":["41136372","41616844","36927457","40313859","41456178","40765077"],"confidence":"Medium","gaps":["Context-specificity of pro- versus anti-tumor effects unresolved","Direct downstream chaperone substrates in these settings unknown"]},{"year":null,"claim":"It remains unknown what physiological client proteins HSPA6 holds or refolds and how its substrate-binding domain selectivity relates to its diverse non-canonical scaffolding/regulatory functions.","evidence":"No discovery in the corpus defines a refolding substrate repertoire or structural basis of partner discrimination","pmids":[],"confidence":"Low","gaps":["No defined client/substrate spectrum","No structural model of HSPA6-specific interactions","Mechanism reconciling chaperone versus signaling roles unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[4,6,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[21,23,22,25]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[23]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[11,15]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[11,19]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[10]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[21,23]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell 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It has little or no basal expression and is induced only at higher temperatures compared to the major inducible HSP70.\",\n      \"method\": \"cDNA isolation, hybrid-selected translation, Northern blot, S1 nuclease protection, ATP-binding assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 (in vitro ATP-binding assay) / Weak — single lab, foundational characterization but no mutagenesis or reconstitution of chaperone activity\",\n      \"pmids\": [\"2327978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"HSPA6 maps to human chromosome 1q and is expressed as an mRNA only upon heat stress, with no basal expression detectable.\",\n      \"method\": \"Somatic cell hybrid panel hybridization, Northern blot with specific oligonucleotides\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chromosomal localization and expression confirmed by two orthogonal methods in single lab\",\n      \"pmids\": [\"1346391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The HSP70B (HSPA6) promoter is repressed at 37°C by three independent mechanisms: (1) NFIL6 displaces HSF1 from the heat shock element (HSE) independently of Ku70; (2) Ku70 binds HSF1 and displaces it from the HSE in vitro; (3) MAPK/GSK3-mediated phosphorylation of HSF1 at Ser303/Ser307 contributes independently. In Ku-deficient cells, HSF1 activation of the HSP70B promoter is greatly enhanced.\",\n      \"method\": \"Promoter reporter assays, HSF1 mutant analysis, in vitro translated Ku70 binding/displacement assay, Ku-deficient cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches in single lab including in vitro binding assay and genetic (Ku-deficient) epistasis\",\n      \"pmids\": [\"11162511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Ha-Ras(val12) induces HSPA6 (HSP70b) transcription via heat shock elements (HSEs) in an HSF1-dependent manner. Stable Ha-ras(val12)-transformed cells, however, suppress HSPA6 expression, correlating with increased sensitivity to heat shock.\",\n      \"method\": \"Transient transfection of HSP70b promoter-reporter constructs, systematic deletions and point mutations, HSF1-/- cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutational analysis plus genetic (HSF1-knockout) epistasis, single lab\",\n      \"pmids\": [\"16278678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"siRNA knockdown of HSPA6 (Hsp70B') sensitizes human colon cells to heat stress and proteasome inhibition, establishing a direct cytoprotective function. HSPA6 is a secondary stress responder relative to Hsp72, but ZnSO4 induces HSPA6 specifically (not Hsp72), indicating stressor-specific primary roles.\",\n      \"method\": \"siRNA knockdown, flow cytometry viability assay, promoter-GFP flow cytometry\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple cell lines, two orthogonal methods, confirmed in two independent publications (PMID 18229458 and 17915554)\",\n      \"pmids\": [\"17915554\", \"18229458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HSPA6 (Hsp70B') expression is cell-number-dependent, being optimally induced at low cell numbers. Medium conditioned from low-cell-number cultures promotes Hsp70B' promoter activation in high-cell-number cultures, indicating an extracellular regulator. This regulation is not explained by changes in HSF-1 DNA-binding activity or hyperphosphorylation.\",\n      \"method\": \"Flow cytometry using Hsp70B' promoter-driven GFP construct, conditioned medium transfer experiments, HSF-1 EMSA\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (promoter-GFP, conditioned medium, EMSA) in single lab\",\n      \"pmids\": [\"17044073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HSPA6 (Hsp70B') forms a complex with Hsp72 and the co-chaperone HOP following heat stress in human colon cells. siRNA knockdown of either Hsp70B' or Hsp72 severely impairs acquisition of cytoprotection, supporting cooperative roles in cell survival.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, flow cytometry viability assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal-style Co-IP plus functional siRNA knockdown, single lab\",\n      \"pmids\": [\"18579131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HSPA6 (Hsp70B') is expressed on the cell surface in response to proteasome inhibition (but not heat shock) in certain human colon cell lines. Phylogenetic analysis indicates that Hsp70B' and Hsp72 share 100% identity in their predicted peptide-binding regions, suggesting they bind the same substrates, while sequence differences in lid and C-terminal domains suggest different co-chaperone or receptor interactions.\",\n      \"method\": \"Flow cytometry for surface expression, phylogenetic sequence analysis\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — flow cytometry localization in single lab; sequence analysis is computational; no direct co-chaperone binding experiment\",\n      \"pmids\": [\"18347947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HSPA6 (Hsp70B') forms heteromeric complexes with Hsp70, Hsc70, and Hsp40 in differentiated human neuronal cells, detected by co-immunoprecipitation.\",\n      \"method\": \"Co-immunoprecipitation from differentiated SH-SY5Y human neuronal cells\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP method, single lab, no reciprocal pulldown described\",\n      \"pmids\": [\"20084477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In macrophages, oxLDL immune complexes (oxLDL-IC) induce synthesis and release of HSPA6 (HSP70B'). Released HSP70B' co-localizes with cell-associated and internalized lipid moiety of oxLDL-IC. siRNA knockdown of HSP70B' decreased sphingosine kinase 1 (SK1) mRNA levels and SK1 phosphorylation, and increased IL-10 release, implicating HSPA6 in regulating SK1 activity and IL-10 secretion.\",\n      \"method\": \"Immunoblot, confocal fluorescence microscopy, HSP70B'-GFP transfection, siRNA knockdown, SK1 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (confocal, GFP-fusion, siRNA with downstream readouts) in single lab\",\n      \"pmids\": [\"20348092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Following thermal stress, YFP-tagged HSPA6 (and HSPA1A) rapidly localizes to the proximal end of centrioles in differentiated human SH-SY5Y neuronal cells, with HSPA6 showing a more prolonged signal than HSPA1A.\",\n      \"method\": \"Live-cell fluorescence microscopy of YFP-tagged HSPA6 in stable cell lines, co-staining with γ-tubulin and centrin markers\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-cell imaging with marker co-localization in stable lines, single lab\",\n      \"pmids\": [\"24061851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Following heat shock in differentiated human SH-SY5Y neuronal cells, YFP-HSPA6 localizes sequentially to nuclear speckles (SC35/SON-positive RNA splicing factor compartments), then the granular component of the nucleolus (nucleophosmin-positive), and subsequently to the periphery of nuclear speckles (perispeckles) that are sites of RNA transcription. This perispeckle localization is unique to HSPA6 and not observed for HSPA1A.\",\n      \"method\": \"Stable YFP-tagged HSPA6 expression in SH-SY5Y cells, confocal microscopy, co-localization with SC35, SON, and nucleophosmin markers\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-cell imaging with multiple validated compartment markers, single lab\",\n      \"pmids\": [\"25319762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The HSPA6 promoter contains negative and positive regulatory regions across 3 kb. A region between -346 and -217 bp is critical for basal expression and stress inducibility. An AP1 site within this region contributes to basal expression and maximal stress induction. A newly characterized HSE in this region mediates heat-induced transcription but preferentially binds a stress-inducible factor other than HSF1 or HSF2 in HaCaT keratinocytes, yet binds both HSF1 and HSF2 from other epithelial cell extracts.\",\n      \"method\": \"Promoter 5' truncations and deletions, site-specific mutagenesis, DNA-binding (EMSA) studies, luciferase reporter assays\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — promoter deletion/mutagenesis plus EMSA, multiple orthogonal approaches, single lab\",\n      \"pmids\": [\"25073946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HSPA6 is strongly and specifically induced by HSP90 inhibitors (17-AAG and Radicicol) in certain cancer cell lines. siRNA-mediated inhibition or recombinant overexpression of HSPA6 did not influence 17-AAG-mediated cell death, indicating HSPA6 is not required for this cytotoxic effect.\",\n      \"method\": \"qPCR, Western blot, siRNA knockdown, recombinant overexpression, cell viability assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (qPCR, Western blot, siRNA, OE) in single lab; negative result on cell death included\",\n      \"pmids\": [\"25957766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"eNOS-derived nitric oxide induces HSPA6 expression (~14-fold) in human coronary artery smooth muscle cells. Adenoviral overexpression of HSPA6 inhibits smooth muscle cell proliferation, paralleling the eNOS anti-proliferative effect.\",\n      \"method\": \"Adenoviral transduction (Ad-eNOS), whole-genome array, qPCR, immunoblotting, adenoviral HSPA6 overexpression, proliferation assay\",\n      \"journal\": \"Nitric oxide : biology and chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (array, qPCR, Western blot, functional OE assay) in single lab\",\n      \"pmids\": [\"26656590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HSPA6 targeting to the periphery of nuclear speckles (perispeckles, transcription sites) after thermal stress is disrupted by the transcription inhibitor triptolide, which knocks down RNA polymerase II large subunit RPB1. This links HSPA6 perispeckle localization to active transcription and suggests a role in transcriptional recovery after neuronal stress.\",\n      \"method\": \"Confocal microscopy of YFP-HSPA6 in SH-SY5Y cells treated with triptolide, Western blot for RPB1\",\n      \"journal\": \"Neurochemical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological perturbation of transcription with localization readout provides functional link, single lab\",\n      \"pmids\": [\"27743288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HSPA6 shows a more prolonged and dynamic association with stress-sensitive structures (centrioles, nuclear speckles, nucleolus, perispeckles) compared to HSPA1A, as measured by FRAP. The stress-induced association of HSPA6 with perispeckles (transcription sites) displays the greatest dynamism among all structures examined.\",\n      \"method\": \"Live-cell confocal microscopy and FRAP of YFP-tagged HSPA6 and HSPA1A in differentiated SH-SY5Y cells\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging plus quantitative FRAP, single lab\",\n      \"pmids\": [\"27527722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HSPA6 co-immunoprecipitates with anti-apoptotic Bcl-XL in intestinal epithelial cells. Cigarette smoke extract (CSE) strongly induces HSPA6, which stabilizes Bcl-XL protein levels (without altering Bcl-XL mRNA), thereby protecting intestinal epithelial cells from apoptosis.\",\n      \"method\": \"Immunoprecipitation, Q-PCR, Western blotting, immunofluorescence microscopy\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus mRNA/protein dissociation providing mechanistic stabilization evidence, single lab\",\n      \"pmids\": [\"26826017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"siRNA knockdown of HSPA6 and HSPA1A in differentiated human SH-SY5Y neuronal cells abolishes the protective effect of co-applied celastrol/arimoclomol against heat shock, establishing that both HSPs contribute to protection of human neuronal cells from thermal stress.\",\n      \"method\": \"siRNA knockdown, cell viability assay after heat shock, celastrol/arimoclomol co-treatment\",\n      \"journal\": \"Neurochemical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean siRNA knockdown with specific pharmacological/thermal stress phenotype, single lab\",\n      \"pmids\": [\"29090408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"After heat shock in differentiated human neuronal cells, HSPA6 targets the periphery of nuclear speckles (perispeckles/transcription sites) but does NOT co-localize with DNAJB1 (Hsp40-1) or HSPH1 (Hsp105α) at this site. At 3 h post-heat shock, HSPA6 co-localizes with DNAJB1 and HSPH1 at the granular component of the nucleolus. By contrast, HSPA1A and HSPA8 co-localize with these disaggregation machine components at nuclear speckles immediately after heat shock.\",\n      \"method\": \"Confocal microscopy of YFP-tagged HSPA6 with co-staining for DNAJB1, HSPH1, DNAJA1, and BAG-1 in differentiated SH-SY5Y cells\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic co-localization with multiple validated markers, single lab\",\n      \"pmids\": [\"28484369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sulfur mustard (SM)-induced HSPA6 protein upregulation is mediated through TRPA1 ion channel activation. Pre-treatment with the specific TRPA1 inhibitor AP18 diminishes SM-induced HSPA6 upregulation, establishing TRPA1 as an upstream regulator.\",\n      \"method\": \"2D gel electrophoresis proteomics, MALDI-TOF mass spectrometry, RT-qPCR, TRPA1 inhibitor (AP18) treatment in TRPA1-overexpressing HEK cells and endogenous A549 cells\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics identification plus pharmacological epistasis with inhibitor in two cell lines, single lab\",\n      \"pmids\": [\"30200301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HSPA6 impedes IFN-β production by blocking the interaction between TRAF3 and IKKε, thereby suppressing antiviral innate immune signaling. This function is exploited by PRRSV through virus-induced lactylation, which transcriptionally activates HSPA6.\",\n      \"method\": \"CUT&Tag combined with RNA-seq, co-immunoprecipitation (TRAF3-IKKε interaction), siRNA knockdown, overexpression, IFN-β reporter assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mechanistic dissection using CUT&Tag+RNA-seq for upstream regulation, Co-IP for TRAF3-IKKε disruption, and functional IFN-β assays; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"38088561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HSPA6 binds to NF-κB p65 and inhibits its nuclear translocation and Ser468 phosphorylation, suppressing transcription of lipogenic enzyme FASN and downregulating LPCAT1/cPLA2, which enriches membrane phospholipids with polyunsaturated fatty acids and promotes ferroptosis in triple-negative breast cancer cells. Concurrently, HSPA6-mediated suppression of lipogenesis depletes palmitate, impairing ANKIB1 palmitoylation and inhibiting ANKIB1 E3 ligase-mediated K48-linked ubiquitination of HSPA6, forming a stabilizing feedback loop.\",\n      \"method\": \"Co-IP (HSPA6-p65 binding), nuclear fractionation, Western blot for p65 phosphorylation, FASN/LPCAT1/cPLA2 expression, lipid peroxidation assays, ANKIB1 palmitoylation assay, ubiquitination assay\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Co-IP, fractionation, lipid assays, ubiquitination) in single lab; peer-reviewed but newly published\",\n      \"pmids\": [\"42088412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HSPA6 is induced by RIG-I-like receptor (RLR) activation and acts as a negative regulator of type-I interferon signaling. HSPA6 induction is independent of MAVS or IRF3 but depends on E3 ligases associated with RLRs, stress granules, and transcription factors IRF1 and AP-1. HSPA6 binds to RIG-I and MDA5 in the cytoplasm and disrupts their multimer complex formation.\",\n      \"method\": \"Co-immunoprecipitation (HSPA6-RIG-I/MDA5 binding), Western blot, RLR multimer assay, genetic epistasis (MAVS-/-, IRF3-/-, IRF1 knockdown, AP-1 inhibition), IFN-β reporter assay\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus epistasis experiments across multiple pathway components, single lab\",\n      \"pmids\": [\"41762233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM35 directly binds the HSPA6 promoter, catalyzes non-proteolytic ubiquitination of histone H3, which recruits p300 to mediate H3K27 acetylation, thereby activating HSPA6 transcription. This epigenetic mechanism underlies TRIM35's tumor-suppressive effect in breast cancer that is mediated through HSPA6 upregulation.\",\n      \"method\": \"ChIP (TRIM35 promoter binding), co-immunoprecipitation (TRIM35-H3 interaction), H3 ubiquitination assay, H3K27 acetylation assay, p300 recruitment assay, siRNA knockdown, reporter assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP, Co-IP, histone modification assays provide multi-method mechanistic chain, single lab\",\n      \"pmids\": [\"41136372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HSPA6 interacts with IMPDH2, a rate-limiting enzyme in purine biosynthesis, and promotes GTP synthesis to drive radioresistance in glioblastoma stem cells. Mechanistically, HSPA6 recruits ROCK2 kinase to phosphorylate IMPDH2 at S416, activating it. Combined pharmacological inhibition of HSPA6 and IMPDH2 with irradiation significantly improves survival in GBM mouse models.\",\n      \"method\": \"Co-immunoprecipitation (HSPA6-IMPDH2, HSPA6-ROCK2), IMPDH2 phosphorylation assay (S416), GTP synthesis assay, siRNA knockdown, in vivo mouse GBM model, pharmacological inhibition\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus enzymatic assay plus in vivo model with specific phospho-site; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"42234559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Lactate-induced H3K18 lactylation at the HSPA6 locus transcriptionally activates HSPA6 expression during renal ischemia-reperfusion injury. Elevated HSPA6 then promotes cuproptosis and worsens renal damage. Knockdown of HSPA6 suppresses OGD/R-induced cuproptosis.\",\n      \"method\": \"Multi-omics (proteomics, CUT&Tag, RNA-seq), ChIP-qPCR (H3K18la at HSPA6 locus), LDHA inhibition, HSPA6 knockdown, in vivo IRI mouse model\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CUT&Tag chromatin profiling plus ChIP-qPCR directly at HSPA6 locus plus functional knockdown, single lab\",\n      \"pmids\": [\"41616844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BARX1 transcription factor directly activates HSPA6 transcription, as confirmed by dual-luciferase reporter assay with BARX1 binding to the HSPA6 promoter. HSPA6 knockdown attenuates BARX1-induced osteosarcoma cell proliferation and migration.\",\n      \"method\": \"RNA sequencing after BARX1 overexpression, dual-luciferase reporter assay, siRNA knockdown, proliferation and migration assays, dual immunofluorescence\",\n      \"journal\": \"Journal of orthopaedic surgery and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter reporter assay plus siRNA epistasis, single lab\",\n      \"pmids\": [\"36927457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CAIX overexpression activates HSPA6 expression through the AMPK signaling pathway in osteosarcoma cells, promoting cell migration and invasion. Pharmacological AMPK inhibition (dorsomorphin) suppresses CAIX-induced HSPA6 expression and metastasis. HSPA6 knockdown reduces CAIX-driven migration and invasion.\",\n      \"method\": \"CAIX overexpression, siRNA knockdown of HSPA6, Western blot for AMPK phosphorylation, AMPK inhibitor (dorsomorphin), migration/invasion assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis plus siRNA knockdown with functional readouts, single lab\",\n      \"pmids\": [\"40765077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ZT-22, a benzofuran derivative of β-elemene, directly binds HSPA6 protein. This binding activates the p38 MAPK signaling pathway and inhibits HCC cell growth. HSPA6 knockdown diminishes p38 MAPK signaling and reverses ZT-22 anti-HCC effects.\",\n      \"method\": \"DARTS combined with mass spectrometry for target identification; CETSA, SPR, microscale thermophoresis (MST), molecular docking, molecular dynamics simulations for binding validation; siRNA knockdown with p38 MAPK readout\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding confirmed by four independent biophysical/biochemical methods (DARTS-MS, CETSA, SPR, MST) plus functional siRNA epistasis; single paper but multiple orthogonal high-quality methods\",\n      \"pmids\": [\"40239884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HSPB6 directly interacts with HSPA6 (detected by immunoprecipitation mass spectrometry), and HSPB6 overexpression inhibits the JNK-JUND signaling axis downstream of HSPA6, suppressing colorectal cancer progression.\",\n      \"method\": \"Immunoprecipitation mass spectrometry, Western blot, RNA sequencing, in vivo tumor model\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single IP-MS experiment for HSPB6-HSPA6 interaction; HSPA6's role in JNK-JUND axis inferred from HSPB6's effect on HSPA6 in single lab\",\n      \"pmids\": [\"41043501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CITED2 binds EP300 and regulates HSPA6 gene expression; CITED2 knockdown in human spermatogonial stem cell lines significantly inhibits proliferation and increases apoptosis, and overexpression of HSPA6 rescues these effects, placing HSPA6 downstream of the CITED2-EP300 complex via the MAPK pathway.\",\n      \"method\": \"siRNA knockdown, RNA sequencing, immunoprecipitation (CITED2-EP300), HSPA6 overexpression rescue assay\",\n      \"journal\": \"Stem cells international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus RNA-seq plus epistatic rescue experiment, single lab\",\n      \"pmids\": [\"40313859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATF3 binds the HSPA6 promoter to activate its transcription downstream of PERP upregulation. PERP overexpression suppresses breast cancer metastasis, and knockdown of ATF3 or HSPA6 eliminates this antimetastatic effect, establishing a PERP-ATF3-HSPA6 axis.\",\n      \"method\": \"Chromatin immunoprecipitation (ATF3 at HSPA6 promoter), siRNA knockdown, RNA-seq, Western blot, RT-qPCR, migration/invasion assays, in vivo metastasis model\",\n      \"journal\": \"The Journal of international medical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding plus functional epistasis siRNA experiments, single lab\",\n      \"pmids\": [\"41456178\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HSPA6 (HSP70B') is a strictly stress-inducible human HSP70 chaperone (absent in mice/rats) with an N-terminal ATP/nucleotide-binding domain and C-terminal substrate-binding domain; it is transcriptionally activated by heat shock elements (HSF1-dependent), AP-1, IRF1, HSP90 inhibition, proteasome inhibition, eNOS-derived NO, and epigenetic modifications (H3K18 lactylation, TRIM35-mediated H3K27ac); it forms heteromeric complexes with Hsp72, Hsc70, HOP, and Hsp40 to cooperatively protect cells from proteotoxic stress; it localizes sequentially after thermal stress to centrioles, nuclear speckles, nucleolus, and perispeckle transcription sites; it negatively regulates antiviral innate immunity by disrupting RIG-I/MDA5 multimerization and blocking TRAF3-IKKε interaction to suppress IFN-β; it directly binds NF-κB p65 to modulate lipid metabolism and ferroptosis; it activates IMPDH2 via ROCK2-mediated S416 phosphorylation to promote GTP synthesis and radioresistance; and it stabilizes Bcl-XL protein and regulates sphingosine kinase 1 activity in macrophages.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HSPA6 (HSP70B') is a strictly stress-inducible 70 kDa HSP70-family chaperone that binds ATP and provides cytoprotection against proteotoxic insults [#0, #4]. It has little or no basal expression and is transcribed only upon strong stress, downstream of heat shock elements engaging HSF-family factors together with an AP1 element [#1, #12], and is additionally induced by HSP90 inhibition, proteasome inhibition, eNOS-derived nitric oxide, oncogenic Ha-Ras, TRPA1 activation, and a range of transcriptional and epigenetic inputs (BARX1, ATF3, CITED2-EP300, TRIM35-driven H3K27ac, and histone lactylation) [#3, #13, #14, #20, #24, #26, #27, #32]. As a chaperone it cooperates with the HSP70 machinery, forming heteromeric complexes with Hsp72, Hsc70, HOP, and Hsp40, where knockdown of either HSPA6 or Hsp72 abolishes acquired cytoprotection [#6, #8]. After thermal stress HSPA6 redistributes sequentially to centrioles, nuclear speckles, the nucleolar granular component, and the periphery of nuclear speckles (perispeckles), a transcription-site localization that is unique to HSPA6 and dependent on active RNA polymerase II, implicating it in transcriptional recovery [#10, #11, #15]. Beyond canonical chaperone roles, HSPA6 acts as a negative regulator of antiviral type-I interferon signaling by binding RIG-I and MDA5 to disrupt their multimerization and by blocking the TRAF3-IKKε interaction to suppress IFN-β [#21, #23]. It also engages disease-relevant effector pathways: it binds and stabilizes anti-apoptotic Bcl-XL [#17], binds NF-κB p65 to suppress lipogenesis and promote ferroptosis through a palmitoylation-dependent feedback loop with ANKIB1 [#22], and recruits ROCK2 to phosphorylate and activate IMPDH2 (S416), driving GTP synthesis and radioresistance [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established HSPA6 as a distinct, highly stress-inducible HSP70 paralog with ATP-binding capacity, setting the expectation of chaperone function.\",\n      \"evidence\": \"cDNA isolation, hybrid-selected translation, Northern blot, and ATP-binding assay\",\n      \"pmids\": [\"2327978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct reconstitution of chaperone/refolding activity\", \"No mutagenesis of the nucleotide-binding domain\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapped HSPA6 to chromosome 1q and confirmed its expression is restricted to heat stress with no detectable basal mRNA, defining its tight stress-gating.\",\n      \"evidence\": \"Somatic cell hybrid panel hybridization and Northern blot\",\n      \"pmids\": [\"1346391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No information on tissue-specific induction thresholds\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Dissected how the HSPA6 promoter is held silent at 37°C and activated under stress, identifying HSE and AP1 elements and HSF1 regulation by repressors (NFIL6, Ku70) and inducers (Ha-Ras).\",\n      \"evidence\": \"Promoter reporter/truncation/mutagenesis assays, EMSA, HSF1-null and Ku-deficient cells\",\n      \"pmids\": [\"11162511\", \"16278678\", \"25073946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the non-HSF1 stress-inducible HSE-binding factor in keratinocytes unresolved\", \"Extracellular regulator of cell-number-dependent induction not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that HSPA6 is functionally cytoprotective and acts cooperatively within the HSP70 chaperone network rather than in isolation.\",\n      \"evidence\": \"siRNA knockdown with viability assays plus Co-IP with Hsp72, Hsc70, HOP, and Hsp40\",\n      \"pmids\": [\"17915554\", \"18229458\", \"18579131\", \"20084477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate repertoire and co-chaperone selectivity not defined\", \"Co-IPs from single labs without reciprocal validation for some partners\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a unique HSPA6 stress-relocalization itinerary culminating at transcription sites, linking the chaperone to transcriptional recovery after stress.\",\n      \"evidence\": \"Live-cell confocal microscopy, FRAP, marker co-localization, and triptolide perturbation in SH-SY5Y cells\",\n      \"pmids\": [\"24061851\", \"25319762\", \"27743288\", \"27527722\", \"28484369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular cargo or function at perispeckles not identified\", \"Mechanism distinguishing HSPA6 from HSPA1A targeting unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a non-chaperone role: HSPA6 suppresses antiviral type-I interferon signaling, identifying a host factor exploited by pathogens.\",\n      \"evidence\": \"CUT&Tag+RNA-seq, Co-IP of TRAF3-IKKε, siRNA/overexpression, and IFN-β reporter assays\",\n      \"pmids\": [\"38088561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of TRAF3-IKKε disruption not resolved\", \"Whether chaperone activity is required for this function unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended HSPA6's immune-suppressive role upstream to the receptor level, showing it binds RIG-I and MDA5 to block their multimerization.\",\n      \"evidence\": \"Co-IP of HSPA6 with RIG-I/MDA5, RLR multimer assay, and genetic epistasis (MAVS-/-, IRF3-/-, IRF1, AP-1)\",\n      \"pmids\": [\"41762233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding interface on RIG-I/MDA5 not mapped\", \"Relationship to the TRAF3-IKKε mechanism not integrated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Connected HSPA6 to effector pathways in cancer—apoptosis, lipid metabolism/ferroptosis, and purine biosynthesis—showing direct binding partners that it stabilizes, sequesters, or activates.\",\n      \"evidence\": \"Co-IP (Bcl-XL, NF-κB p65, IMPDH2, ROCK2), phospho-site mapping (IMPDH2 S416), lipid/ferroptosis and ubiquitination assays, in vivo GBM model\",\n      \"pmids\": [\"26826017\", \"42088412\", \"42234559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these interactions reflect chaperone holding versus dedicated scaffolding is unclear\", \"Most mechanisms from single labs without independent replication\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identified additional transcriptional/epigenetic inducers (BARX1, ATF3, CITED2-EP300, TRIM35-H3K27ac, histone lactylation) coupling HSPA6 induction to proliferation, metastasis, ferroptosis, and cuproptosis outcomes.\",\n      \"evidence\": \"ChIP, reporter assays, histone modification assays, siRNA/rescue, and in vivo tumor/IRI models\",\n      \"pmids\": [\"41136372\", \"41616844\", \"36927457\", \"40313859\", \"41456178\", \"40765077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-specificity of pro- versus anti-tumor effects unresolved\", \"Direct downstream chaperone substrates in these settings unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown what physiological client proteins HSPA6 holds or refolds and how its substrate-binding domain selectivity relates to its diverse non-canonical scaffolding/regulatory functions.\",\n      \"evidence\": \"No discovery in the corpus defines a refolding substrate repertoire or structural basis of partner discrimination\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No defined client/substrate spectrum\", \"No structural model of HSPA6-specific interactions\", \"Mechanism reconciling chaperone versus signaling roles unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [4, 6, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [21, 23, 22, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [23]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [11, 15]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [11, 19]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21, 23]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [17, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HSPA1A\", \"HSPC70\", \"HSPA8\", \"STIP1\", \"RIGI\", \"IFIH1\", \"BCL2L1\", \"IMPDH2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}