Affinage

THBS4

Thrombospondin-4 · UniProt P35443

Length
961 aa
Mass
105.9 kDa
Annotated
2026-06-10
23 papers in source corpus 14 papers cited in narrative 15 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 6/6 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

THBS4 is a secreted extracellular matrix glycoprotein that functions as a receptor ligand coordinating cell-fate decisions, vascular remodeling, and tissue repair across multiple organ contexts (PMID:23615612, PMID:41207902). It acts as a ligand for the Notch1 receptor, directly binding Notch1 and promoting its endocytosis to activate downstream Notch signaling (including Nfia upregulation) in subventricular-zone neural stem cells, thereby driving injury-induced astrogenesis over neurogenesis (PMID:23615612). THBS4 also engages integrins to activate the PI3K/AKT axis: it binds integrin β1 to stimulate FAK/PI3K/AKT and promote hepatocellular carcinoma proliferation, metastasis, and EMT (PMID:32567740), and binds integrin α2 on endothelial cells to activate PI3K/AKT and drive angiogenesis (PMID:34390328, PMID:41878135). Consistent with a pro-survival, pro-proliferative output, THBS4 sits upstream of PI3K/AKT in prostate cancer stem cells (PMID:32421868) and of TGF-β1 signaling in trophoblasts (PMID:40478535), and is sufficient to promote endothelial proliferation and tube formation in skeletal angiogenesis (PMID:41207902). THBS4 expression is controlled at distinct regulatory levels: transcriptionally by the histone methyltransferase MLL4 via H3K4me1/H3K27ac at the Thbs4 locus (PMID:38876442) and by HIF-1α and TGF-β1/SMAD2/p38 MAPK signaling in pulmonary vascular remodeling (PMID:41873540), and post-translationally through PDGFRβ/IP3R/STIM1/Ca2+-dependent maturation and secretion (PMID:32899998). Through these activities it contributes to a self-reinforcing THBS4–TGF-β/SMAD2 axis in pulmonary vascular remodeling (PMID:41873540), fibrotic ECM remodeling in lung and kidney (PMID:41202384, PMID:40765330), and peripheral nerve regeneration (PMID:41153662).

Mechanistic history

Synthesis pass · year-by-year structured walk · 13 steps
  1. 2013 High

    Established THBS4 as a direct ligand of the Notch1 receptor, answering how an ECM protein steers neural stem cell fate toward astrogenesis after injury.

    Evidence Notch1 binding and endocytosis assays with inducible lineage tracing and Thbs4 knockout phenotyping in a cortical injury model

    PMID:23615612

    Open questions at the time
    • Structural basis of the THBS4–Notch1 interaction not defined
    • Whether THBS4 acts as a canonical Notch ligand or a co-regulator unresolved
  2. 2020 Medium

    Identified integrin β1 as a direct THBS4 receptor activating FAK/PI3K/AKT, linking THBS4 to oncogenic proliferation, metastasis, and EMT.

    Evidence Co-IP, immunofluorescence, in vitro functional assays, and xenograft models in hepatocellular carcinoma

    PMID:32567740

    Open questions at the time
    • No reciprocal or structural validation of binding interface
    • Single tumor context
  3. 2020 Medium

    Showed THBS4 abundance is governed post-translationally rather than transcriptionally, defining a PDGFRβ/IP3R/STIM1/Ca2+ route to its maturation and secretion.

    Evidence Pathway inhibitor blockade with protein-versus-mRNA quantification and conditioned-medium functional assays

    PMID:32899998

    Open questions at the time
    • Nature of the post-translational modification not molecularly identified
    • Single cell-line system
  4. 2020 Medium

    Placed THBS4 upstream of PI3K/AKT in cancer stem cell self-renewal, establishing pathway epistasis via inhibitor rescue.

    Evidence shRNA silencing/overexpression with PI3K/AKT inhibitor and in vivo tumorigenicity in prostate cancer stem cells

    PMID:32421868

    Open questions at the time
    • Receptor mediating PI3K/AKT activation in this context not identified
    • Single lab
  5. 2021 Medium

    Defined integrin α2 as the endothelial receptor through which THBS4 activates PI3K/AKT to drive angiogenesis.

    Evidence RNA-seq screen, xenograft, CAM and HUVEC tube formation assays in a gastric injury context

    PMID:34390328

    Open questions at the time
    • Binding inferred functionally without direct structural evidence
    • Single lab
  6. 2024 High

    Identified MLL4 as a direct epigenetic activator of Thbs4 transcription, connecting THBS4 expression to protection from cardiac ER stress under pressure overload.

    Evidence CUT&Tag-seq and RNA-seq with cardiomyocyte-specific Mll4 knockout and cardiomyocyte knockdown

    PMID:38876442

    Open questions at the time
    • Downstream effectors of THBS4 in cardiomyocytes not dissected
    • Whether THBS4 acts cell-autonomously in heart unresolved
  7. 2025 Medium

    Demonstrated THBS4 is secreted by hypertrophic chondrocyte descendants and is alone sufficient to drive skeletal angiogenesis, rescuing ablation defects.

    Evidence Genetic HC ablation, single-cell RNA-seq, cell-cell communication analysis, and recombinant THBS4 metatarsal explant rescue

    PMID:41207902

    Open questions at the time
    • Endothelial receptor in bone context not confirmed
    • Single lab
  8. 2025 Medium

    Placed THBS4 upstream of TGF-β1 signaling in trophoblast proliferation, migration, and invasion.

    Evidence siRNA knockdown with TGF-β1 agonist rescue and functional assays in HTR-8/SVneo cells

    PMID:40478535

    Open questions at the time
    • Mechanism linking THBS4 to TGF-β1 pathway activation undefined
    • In vitro only
  9. 2025 Medium

    Established THBS4 as a direct binding target whose level tunes fibroblast ECM expression and PI3K/AKT activity in pulmonary fibrosis.

    Evidence SPR binding (Rehmannin), siRNA/overexpression in fibroblasts, and bleomycin fibrosis model

    PMID:41202384

    Open questions at the time
    • Endogenous receptor mediating fibroblast effects not identified
    • Single lab
  10. 2025 Medium

    Showed THBS4 promotes axonal regeneration and limits neuronal apoptosis with associated changes in NF-κB and ERK signaling.

    Evidence siRNA knockdown and AAV overexpression with behavioral, electrophysiological, and ultrastructural readouts in a sciatic nerve transection model

    PMID:41153662

    Open questions at the time
    • Pathway assignment based on expression changes, not mechanistic dissection
    • Receptor in neurons not identified
  11. 2025 Medium

    Placed THBS4 upstream of PI3K/AKT-mediated renal fibrosis via pathway epistasis.

    Evidence UUO and TGF-β1-stimulated HK2 models with THBS4 knockdown and IGF-1 rescue

    PMID:40765330

    Open questions at the time
    • Receptor coupling THBS4 to PI3K/AKT in kidney unknown
    • Single lab
  12. 2026 Medium

    Defined a self-reinforcing THBS4–TGF-β/SMAD2 axis induced by hypoxia/HIF-1α and TGF-β1/SMAD2/p38 MAPK driving pulmonary vascular remodeling.

    Evidence Rat PH transcriptomics, PASMC functional assays, in vivo THBS4 silencing, and pathway analysis

    PMID:41873540

    Open questions at the time
    • Receptor mediating PASMC effects not identified
    • Feedback loop mechanism partially defined
  13. 2026 Medium

    Showed exosome-delivered THBS4 binds endothelial integrin α2 to activate PI3K/AKT and rescue preeclampsia, extending the integrin α2 angiogenic mechanism to a therapeutic delivery context.

    Evidence Exosome characterization, uptake/migration/tube formation assays, and a rat preeclampsia model with intraplacental injection

    PMID:41878135

    Open questions at the time
    • Direct binding interface not structurally resolved
    • Single lab

Open questions

Synthesis pass · forward-looking unresolved questions
  • How THBS4's distinct receptor engagements (Notch1, integrin β1, integrin α2) are selected in different tissues, and the structural basis of these interactions, remain unresolved.
  • No structural model of THBS4 with any receptor
  • Determinants of context-specific receptor choice unknown
  • Identity of receptors in fibroblast and neuronal contexts undefined

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0048018 receptor ligand activity 4 GO:0098772 molecular function regulator activity 2
Localization
GO:0005576 extracellular region 3 GO:0005829 cytosol 1 GO:0005886 plasma membrane 1 GO:0031012 extracellular matrix 1
Pathway
R-HSA-162582 Signal Transduction 5 R-HSA-1474244 Extracellular matrix organization 3 R-HSA-1643685 Disease 3 R-HSA-1266738 Developmental Biology 2
Partners

Evidence

Reading pass · 15 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2013 THBS4 (Thbs4) directly binds Notch1 receptor and promotes its endocytosis, activating downstream Notch signaling (including Nfia transcription factor upregulation) in SVZ neural stem cells to drive astrogenesis over neurogenesis after cortical injury. Thbs4 KO mice show defective injury-induced SVZ astrogenesis, aberrant glial scar formation, and increased microvascular hemorrhage. Notch1 receptor binding assay, endocytosis experiments, tamoxifen-inducible lineage tracing (nestin-creERtm4), Thbs4 homozygous knockout mouse phenotyping with cortical photothrombotic injury model Nature High 23615612
2020 THBS4 interacts physically with integrin β1 (ITGB1), activating the FAK/PI3K/AKT pathway to promote HCC cell proliferation, metastasis, and EMT progression. Co-immunoprecipitation (IP), immunofluorescence, western blot, colony formation assay, transwell assay, xenograft tumor models FASEB journal Medium 32567740
2020 PDGFRβ signaling, activated downstream of TGFβ and PDGF-D, promotes post-translational modification of THBS4 from an incomplete to a complete form and drives its secretion via IP3R, STIM1, and Ca2+-signaling proteins, rather than increasing THBS4 mRNA levels. IP3R and STIM1 pharmacological blockade, PDGFRβ blockade, western blot for THBS4 protein levels vs. mRNA quantification, conditioned medium functional assays (adhesion, migration, proliferation of CCD-18co cells) Cancers Medium 32899998
2021 THBS4, upregulated in BM-MSCs migrating to sites of chronic H. pylori-induced gastric injury, interacts with integrin α2 to activate the PI3K/AKT pathway in endothelial cells, thereby promoting tumor angiogenesis. RNA-seq screening, xenograft tumor models, chicken chorioallantoic membrane assay, HUVEC tube formation assay, immunohistochemistry, immunofluorescence Aging Medium 34390328
2024 Histone methyltransferase MLL4 acts as a transcriptional activator of Thbs4 via mono-methylation of H3K4 (H3K4me1) and H3K27ac occupancy at the Thbs4 gene locus; MLL4 deficiency markedly reduces THBS4 expression, leading to aggravated ER stress and cardiac dysfunction under pressure overload. CUT&Tag-seq, RNA-seq, cardiomyocyte-specific Mll4 knockout mice (pressure overload model), MLL4 knockdown neonatal rat cardiomyocytes, western blot, phenylephrine-induced hypertrophy assay Pharmacological research High 38876442
2025 Hypertrophic chondrocyte descendants (PADs) secrete THBS4 to promote angiogenesis; in vitro, exogenous THBS4 alone is sufficient to promote endothelial cell proliferation and tube formation, and rescues defective angiogenesis in HC-ablated metatarsal explants. Col10a1-Cre;R26DTA/+ HC genetic ablation mouse model, single-cell RNA-seq, in silico cell-cell communication analysis, immunostaining with tissue clearing, in vitro tube formation assay, metatarsal explant rescue assay Bone research Medium 41207902
2025 THBS4 knockdown in HTR-8/SVneo trophoblast cells inhibits TGF-β1 signaling pathway activity and reduces cell proliferation, migration, and invasion; these effects are reversed by TGF-β1 agonist treatment, placing THBS4 upstream of TGF-β1 signaling in trophoblast function. siRNA knockdown, TGF-β1 agonist (hyclate) rescue experiment, cell proliferation/migration/invasion assays, western blot American journal of physiology. Cell physiology Medium 40478535
2026 Hypoxia induces THBS4 expression via HIF-1α, while TGF-β1 stimulation upregulates THBS4 through SMAD2 and p38 MAPK pathways; elevated THBS4 in turn promotes pulmonary artery smooth muscle cell proliferation, phenotypic modulation, and ECM remodeling in a self-reinforcing THBS4–TGF-β/SMAD2 axis driving pulmonary vascular remodeling. In vivo THBS4 silencing attenuated pulmonary vascular remodeling and right ventricular hypertrophy. Whole-transcriptomic analysis of rat PH models, functional assays on pulmonary artery smooth muscle cells, in vivo THBS4 silencing, HIF-1α/SMAD2/p38 MAPK pathway analysis Hypertension Medium 41873540
2025 Rehmannin directly binds THBS4 (confirmed by surface plasmon resonance), and THBS4 knockdown enhances while THBS4 overexpression attenuates Rehmannin's inhibitory effects on fibroblast migration, ECM protein expression, and PI3K/AKT pathway activity in the context of pulmonary fibrosis. Surface plasmon resonance (SPR) binding assay, siRNA knockdown and overexpression in NIH-3T3 fibroblasts and BMDCs, transcriptomic and metabolomic profiling, in vivo bleomycin fibrosis model International immunopharmacology Medium 41202384
2025 THBS4 is localized in the cell membrane and cytoplasm of DRG neurons; overexpression promotes axonal regeneration and reduces neuronal apoptosis, while knockdown has opposite effects. Thbs4 knockdown or overexpression significantly alters NF-κB and ERK signaling pathway activity, implicating these pathways in Thbs4-mediated peripheral nerve repair. siRNA knockdown, AAV-mediated overexpression, immunofluorescence staining, behavioral assays, electrophysiological recordings, transmission electron microscopy, sciatic nerve transection rat model Biomedicines Medium 41153662
2020 THBS4 silencing in prostate cancer stem cells suppresses self-renewal and proliferation, promotes apoptosis, and reduces in vivo tumorigenicity; PI3K/AKT pathway inhibitor mimics THBS4 silencing effects, and THBS4 overexpression activates the PI3K/AKT pathway, placing THBS4 upstream of PI3K/AKT in cancer stem cell regulation. Flow cytometry stem cell sorting, shRNA-mediated THBS4 silencing and overexpression, PI3K/AKT inhibitor treatment, self-renewal/proliferation/apoptosis assays, in vivo tumorigenicity assay, western blot The Prostate Medium 32421868
2026 THBS4 enriched in PMSC-derived exosomes binds integrin α2 (ITG α2) on endothelial cells, activating the PI3K/AKT signaling pathway and enhancing endothelial cell migration and angiogenesis; in vivo administration of these exosomes alleviated preeclampsia symptoms in a rat model. Exosome isolation and characterization (TEM, nanoparticle tracking, western blot, proteomics), exosome uptake assay, transwell migration assay, tube formation assay, immunofluorescence, rat PE model with intraplacental injection International journal of nanomedicine Medium 41878135
2011 THBS4 is expressed and secreted by cancer-associated fibroblasts in diffuse-type gastric adenocarcinoma; tumor cells stimulate THBS4 transcription in fibroblasts. Immunohistochemical co-localization, in vitro secretion assays with cancer-associated fibroblasts, tumor cell co-culture experiments, quantitative RT-PCR Modern pathology Low 21701537
2025 THBS4 knockdown in renal fibrosis models reduces expression of fibrosis-associated proteins and suppresses PI3K/AKT pathway activation (reduced p-AKT and p-PI3K); these effects are reversed by IGF-1 treatment, placing THBS4 upstream of PI3K/AKT-mediated renal fibrosis. UUO mouse model, TGF-β1-stimulated HK2 cell fibrosis model, THBS4 knockdown, IGF-1 rescue, Sirius red/Masson staining, immunohistochemistry, western blot, qPCR Frontiers in bioscience Medium 40765330
2024 In a schizophrenia forebrain assembloid model, neuronal PTPRF signaling elicits THBS4 expression in microglia, and this aberrant neuron-glia signaling axis alters the neuronal transcriptome associated with synapse connectivity. Patient-derived mix-and-match forebrain assembloids, integrated modular gene expression analysis, combinatorial neuron/glia reconstitution experiments bioRxivpreprint Low

Source papers

Stage 0 corpus · 23 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2013 Protective astrogenesis from the SVZ niche after injury is controlled by Notch modulator Thbs4. Nature 225 23615612
2011 THBS4, a novel stromal molecule of diffuse-type gastric adenocarcinomas, identified by transcriptome-wide expression profiling. Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc 93 21701537
2020 THBS4 promotes HCC progression by regulating ITGB1 via FAK/PI3K/AKT pathway. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 80 32567740
2020 THBS4 silencing regulates the cancer stem cell-like properties in prostate cancer via blocking the PI3K/Akt pathway. The Prostate 30 32421868
2016 Reciprocal regulation of long noncoding RNAs THBS4‑003 and THBS4 control migration and invasion in prostate cancer cell lines. Molecular medicine reports 30 27357608
2022 Serum Proteins, HMMR, NXPH4, PITX1 and THBS4; A Panel of Biomarkers for Early Diagnosis of Hepatocellular Carcinoma. Journal of clinical medicine 21 35456219
2020 Potential Role of PDGFRβ-Associated THBS4 in Colorectal Cancer Development. Cancers 20 32899998
2021 THBS4/integrin α2 axis mediates BM-MSCs to promote angiogenesis in gastric cancer associated with chronic Helicobacter pylori infection. Aging 19 34390328
2016 Associations of THBS2 and THBS4 polymorphisms to gastric cancer in a Southeast Chinese population. Cancer genetics 18 27160021
2024 Histone methyltransferase MLL4 protects against pressure overload-induced heart failure via a THBS4-mediated protection in ER stress. Pharmacological research 13 38876442
2025 THBS4 downregulation alters trophoblast function in preeclampsia via the TGF-β1/Smad signaling cascade. American journal of physiology. Cell physiology 7 40478535
2013 Long-standing balancing selection in the THBS4 gene: influence on sex-specific brain expression and gray matter volumes in Alzheimer disease. Human mutation 7 23420636
2002 The zebrafish thrombospondin 3 and 4 genes (thbs3 and thbs4): cDNA and protein structure. DNA sequence : the journal of DNA sequencing and mapping 7 12592708
2021 DNA Methylation in INA, NHLH2, and THBS4 Is Associated with Metastatic Disease in Renal Cell Carcinoma. Cancers 6 35008203
2020 Downregulation of Thbs4 caused by neurogenic niche changes promotes neuronal regeneration after traumatic brain injury. Neurological research 6 32684116
2025 Descendants of hypertrophic chondrocytes promote angiogenesis by secreting THBS4 during bone growth and injury repair. Bone research 5 41207902
2024 LncRNA-THBS4 affects granulosa cell proliferation and apoptosis in diminished ovarian reserve by regulating PI3K/AKT/mTOR signaling pathway. Journal of reproductive immunology 3 39732055
2025 Transcriptome sequencing revealed that lymph node metastasis of papillary thyroid microcarcinoma is associated with high THBS4 expression and PDGFRA+ cancer-associated fibroblasts. Frontiers in oncology 1 40303998
2025 Investigating How Thbs4 Regulates Degeneration and Regeneration of the Peripheral Nerve. Biomedicines 1 41153662
2025 Rehmannin attenuates bleomycin-induced pulmonary fibrosis via THBS4-dependent modulation of fibroblast-dendritic cell interplay and matrix dynamics. International immunopharmacology 1 41202384
2026 THBS4 Regulates Pulmonary Hypertension via TGF-β/SMAD2 Signaling. Hypertension (Dallas, Tex. : 1979) 0 41873540
2026 Exosomal THBS4 Derived From Human Placental Mesenchymal Stem Cells Promotes the Migration and Angiogenesis of the Endothelial Cells in Preeclampsia by Activating the Integrin α2/PI3K/AKT Axis. International journal of nanomedicine 0 41878135
2025 The Role of THBS4 in Chronic Kidney Disease Fibrosis: From Clinical Observations to Molecular Mechanisms. Frontiers in bioscience (Landmark edition) 0 40765330

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