{"gene":"TFF3","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2019,"finding":"TFF3 physically interacts with LINGO2 on the cell membrane of intestinal epithelial cells (co-immunoprecipitation and co-localization), and TFF3-LINGO2 interactions disrupt inhibitory EGFR-LINGO2 complexes, resulting in enhanced EGFR signaling that mediates TFF3's anti-apoptotic and wound healing functions.","method":"Co-immunoprecipitation, co-localization, Lingo2 knockout mice, apoptosis assays, colitis and helminth infection models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, genetic knockout model, multiple orthogonal functional assays, clear mechanistic pathway defined","pmids":["31562318"],"is_preprint":false},{"year":2021,"finding":"CD147 (a membrane protein) was identified as a binding partner for TFF3; TFF3 binding to CD147 enhances CD147-CD44s interaction, leading to STAT3 activation and PTGS2 (COX-2) expression, which drives migration, proliferation, invasion and generates PGE2 that acts via PTGER4. Solution NMR identified key TFF3 residues critical for CD147 binding.","method":"Co-immunoprecipitation, competitive inhibitory antibodies, siRNA knockdown, xenograft mouse model, solution NMR","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure-function, reciprocal co-IP, mutagenesis of binding residues, multiple orthogonal functional assays in vitro and in vivo","pmids":["34262017"],"is_preprint":false},{"year":2010,"finding":"Human intestinal TFF3 exists predominantly as a high-molecular-weight heteromer disulfide-linked to FCGBP (IgG Fc binding protein) in colonic extracts; this complex can be dissociated in vitro by hydrogen sulfide (H2S), releasing biologically active TFF3 monomer/dimer forms.","method":"Purification of colonic TFF3, LC-ESI-MS/MS identification of FCGBP as partner, in vitro H2S reduction assay","journal":"Journal of proteome research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical purification, MS identification, in vitro dissociation assay, single lab but multiple orthogonal methods","pmids":["20423149"],"is_preprint":false},{"year":2011,"finding":"Rat TFF3, IgGFcγBP and Muc2 C-terminal domains are bound together by covalent (disulfide) interactions in the soluble fraction of intestinal mucus, forming heteropolymers in both the loose and firm mucus layers; co-immunoprecipitation confirmed these interactions, which are disrupted by DTT.","method":"Western blotting under reducing/non-reducing conditions, co-immunoprecipitation, immunostaining","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and biochemical fractionation, single lab, two orthogonal methods confirming covalent TFF3-FCGBP-MUC2 complex","pmids":["21629776"],"is_preprint":false},{"year":2013,"finding":"DMBT1(gp340) binds specifically to dimeric TFF3 (but not monomeric TFF3, monomeric TFF2 or glycosylated TFF2) in a calcium-dependent manner, as shown by ELISA binding assay.","method":"ELISA binding assay with recombinant TFF3 forms, monoclonal antibody characterization","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — solid-phase binding ELISA, specificity for dimer vs monomer characterized, single lab","pmids":["23691218"],"is_preprint":false},{"year":2006,"finding":"Van Gogh-like protein 1 (Vangl1) is Ser/Thr phosphorylated in response to ITF/TFF3 stimulation; Vangl1 overexpression enhances ITF-stimulated wound closure in intestinal epithelial cells, and siRNA knockdown of Vangl1 inhibits the migratory response to ITF, identifying Vangl1 as a downstream effector of TFF3 signaling in mucosal repair.","method":"Immunoprecipitation of phosphoproteins + mass spectrometry identification, siRNA knockdown, overexpression, wound closure assays, confocal microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — phosphoproteomic identification, gain- and loss-of-function with specific wound-healing readout, multiple orthogonal methods","pmids":["16410243"],"is_preprint":false},{"year":2005,"finding":"TFF3 activates STAT3 signaling via Tyr705 phosphorylation of both STAT3α and STAT3β isoforms in colorectal cancer cells; blockade of STAT3 signaling abrogates TFF3-induced cellular invasion, establishing TFF3 as an activator of STAT3-dependent invasion.","method":"Western blot for phospho-STAT3, siRNA depletion of STAT3, pharmacological STAT3 inhibition, Matrigel invasion assay, tumor xenograft model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — phospho-specific western blot, RNAi, pharmacological inhibition, in vivo xenograft, multiple orthogonal methods in one study","pmids":["15665295"],"is_preprint":false},{"year":2005,"finding":"TFF3 triggers transient NF-κB activation and prolonged upregulation of Twist protein via an ERK kinase-mediated pathway in intestinal epithelial cells, in contrast to TNF-α which causes persistent NF-κB activation and Twist degradation via the proteasome; TFF3-induced Twist prevents IL-8 production downstream of NF-κB.","method":"NF-κB reporter assays, western blotting, siRNA silencing of Twist, IL-8 ELISA, pharmacological MEK inhibition","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays, RNAi, pharmacological inhibition, single lab with multiple methods","pmids":["16014704"],"is_preprint":false},{"year":2016,"finding":"TFF3-induced cell migration in conjunctival epithelial cells requires CXCR4 and CXCR7 (chemokine receptors); blocking CXCR4 and/or CXCR7 completely suppressed TFF3-stimulated migration, while ERK1/2 pathway activation by TFF3 was independent of CXCR4/CXCR7 signaling.","method":"X-ray structure-based molecular modeling, flow cytometry, receptor blocking assays, migration assays, western blot for ERK activation","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — receptor blocking functional assay and structural modeling, single lab, migration assay with mechanistic dissection of ERK vs receptor dependence","pmids":["26780310"],"is_preprint":false},{"year":2004,"finding":"TFF3 reduces E-cadherin levels in intestinal epithelial cells through two distinct mechanisms: transcriptional downregulation of E-cadherin (shown by RT-PCR) and increased E-cadherin degradation (shown by pulse-chase experiments), with concomitant reduction of α- and β-catenin levels.","method":"FLAG-hTFF3 stable transfection, multiplex RT-PCR, methylation-specific PCR, pulse-chase experiments","journal":"Peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pulse-chase for post-translational mechanism, RT-PCR for transcriptional mechanism, multiple orthogonal methods, single lab","pmids":["15177884"],"is_preprint":false},{"year":2006,"finding":"TFF3 expression in stably transfected HT29/B6 and MDCK cells increases claudin-1 levels, decreases claudin-2 levels, and increases transepithelial resistance in confluent monolayers, indicating TFF3 regulates intestinal barrier function by altering tight junction claudin composition.","method":"Stable transfection of FLAG-hTFF3, western blotting for claudins and tight junction proteins, transepithelial resistance measurement","journal":"Peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable expression model with functional TER readout and protein quantification, single lab, two orthogonal methods","pmids":["17018241"],"is_preprint":false},{"year":2001,"finding":"TFF3 secretion from the isolated vascularly perfused rat colon is induced by bethanechol, VIP, bombesin, IL-1β, and degranulator compound bromolasalocid, but not by somatostatin, neurotensin, or PYY, indicating TFF3 release is regulated by the enteric nervous system and resident immune cells; colonic TFF3 is present in a disulfide-linked complex in luminal effluent.","method":"Isolated vascularly perfused rat colon preparation, radioimmunoassay, gel chromatography","journal":"Regulatory peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo perfusion system, specific pharmacological stimuli, RIA quantification, single lab","pmids":["11495677"],"is_preprint":false},{"year":2003,"finding":"TNF-α reduces TFF3 expression up to 10-fold in colonic tumor cells via NF-κB activation; NF-κB directly represses TFF3 transcription as shown by reporter gene assays, and this repression is reversible by IκB overexpression; in vivo, increased NF-κB expression in colitis coincides with reduced TFF3.","method":"Quantitative real-time PCR, reporter gene assays with NF-κB subunit overexpression and IκB co-expression, immunohistochemistry in rat colitis model","journal":"Gut","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter gene assay with co-expression, in vitro and in vivo data, single lab","pmids":["12912861"],"is_preprint":false},{"year":2008,"finding":"Hypoxia-inducible factor-1 (HIF-1) mediates induction of TFF3 (and TFF1, TFF2) gene expression by hypoxia in gastric epithelial cells; siRNA knockdown of HIF-1α reduced TFF induction by hypoxia, and overexpression of HIF-1α in non-hypoxic cells induced TFF gene expression and transactivated a TFF1 reporter construct.","method":"HIF-1α siRNA transfection, HIF-1α overexpression, TFF1 reporter assay, qRT-PCR, in vivo aspirin-treated rat gastric damage model with hypoxyprobe immunostaining","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and overexpression of HIF-1α, reporter assay, in vitro and in vivo, single lab","pmids":["19076725"],"is_preprint":false},{"year":2010,"finding":"IL-6 induces TFF3 expression in human biliary epithelial cells via STAT3 phosphorylation; STAT3 siRNA knockdown abrogates IL-6-induced TFF3 expression and cell migration, and exogenous TFF3 rescues migration defects caused by STAT3 silencing, placing TFF3 downstream of IL-6/STAT3 in a wound healing pathway.","method":"siRNA knockdown of STAT3, western blot for phospho-STAT3, RT-PCR, in vitro wound healing assay, rescue with exogenous TFF3","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with pathway rescue experiment, multiple readouts, single lab","pmids":["20229017"],"is_preprint":false},{"year":2006,"finding":"CDX2 transcriptionally activates TFF3; CDX2 overexpression significantly upregulates TFF3 reporter gene transcription, EMSA identified at least two CDX-binding sites in the TFF3 promoter (with the proximal site at -63 being most important), and CDX2 stable transfection increased endogenous TFF3 mRNA.","method":"Transient transfection reporter assays, EMSA, deletion analysis, stable transfection with qRT-PCR for endogenous TFF3","journal":"Regulatory peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA for direct binding, reporter assay with deletion analysis, endogenous expression confirmation, single lab","pmids":["17182120"],"is_preprint":false},{"year":2016,"finding":"TFF3 (ITF) simultaneously activates ERK and JAK/STAT3 signaling pathways in intestinal epithelial cells, with crosstalk between the two pathways; MEK inhibitor U0126 and JAK inhibitor AG490 each abolished TFF3-induced cell migration, MMP2/MMP9 upregulation, and E-cadherin degradation.","method":"Western blot for phospho-ERK and phospho-STAT3, pharmacological inhibition (U0126, AG490), Transwell migration assay, qRT-PCR for MMPs, immunofluorescence for E-cadherin","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with multiple functional readouts, single lab","pmids":["27616044"],"is_preprint":false},{"year":2009,"finding":"TFF3 signals through MAPK (JNK, p38, ERK1/2) and PI3K/PKB pathways in oral keratinocytes, as detected by phosphoprotein array; TFF3 stimulation induces changes in genes related to cell survival, growth/proliferation, and migration including transient upregulation of FOS and MYCBP2.","method":"Phosphoprotein array, mRNA microarray, RT-PCR validation","journal":"European journal of oral sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — array-based discovery, single lab, no loss-of-function validation or receptor identification","pmids":["19758246"],"is_preprint":false},{"year":2005,"finding":"PI3-K/Akt pathway promotes TFF3 expression and MUC2 expression during intestinal goblet cell differentiation; pharmacological PI3-K inhibition (LY294002) profoundly reduced TFF3 and MUC2 expression and mucin granule content, while MEK inhibition did not affect differentiation.","method":"PI3-K activity assay, LY294002 and PD98059 pharmacological inhibition, RT-PCR, Northern blot, RIA, dominant negative STAT6 transfection","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with multiple TFF3 readouts, dominant-negative approach for STAT6 exclusion, single lab","pmids":["15733066"],"is_preprint":false},{"year":2013,"finding":"Overexpression of Tff3 in primary mouse hepatocytes inhibited gluconeogenic gene expression (G6pc, PEPCK, PGC-1α) and decreased glucose output; adenovirus-mediated Tff3 overexpression in diabetic/obese mice improved glucose tolerance and insulin sensitivity.","method":"Adenovirus-mediated overexpression in primary hepatocytes and in vivo, glucose tolerance test (GTT), insulin tolerance test (ITT), gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo overexpression with metabolic readouts, single lab","pmids":["24086476"],"is_preprint":false},{"year":2017,"finding":"Hepatic GALE overexpression impairs glucose tolerance via downregulation of Tff3; restoration of Tff3 expression in GALE-overexpressing mice corrected glucose intolerance, placing Tff3 downstream of GALE in a hepatic glucose homeostasis pathway.","method":"Inducible tissue-specific mouse model, transcriptional profiling, Tff3 restoration rescue experiment, glucose tolerance tests","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via rescue experiment, in vivo mouse model, single lab","pmids":["28877911"],"is_preprint":false},{"year":2003,"finding":"Injected radiolabeled TFF3 dimer (but not monomer to the same extent in the stomach) binds specifically to TFF2-immunoreactive cells in the gastrointestinal tract at basolateral sites with receptor-like activity; binding is saturable (displaced by excess unlabeled TFF3) and distinct from TFF1/TFF3-immunoreactive cells.","method":"Intravenous injection of 125I-TFF3 in rats, gamma counting, autoradiography, displacement with excess unlabeled peptide, TCA precipitation","journal":"Regulatory peptides","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — radiolabeled ligand binding with saturability demonstration, autoradiographic localization, single lab","pmids":["12972324"],"is_preprint":false},{"year":2007,"finding":"TFF3 and EGF induce different cell migration patterns in intestinal epithelial cells: TFF3 promotes collective sheet migration with continuous coverage, while EGF induces network-like migration with gaps; both treatments trigger E-cadherin internalization/recycling.","method":"Scratch wound assay, time-lapse video microscopy, morphometry, immunocytochemistry/confocal microscopy","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with quantitative morphometry and protein localization, single lab","pmids":["17762162"],"is_preprint":false},{"year":2019,"finding":"TFF3 exerts oncogenic function in lung adenocarcinoma through upregulation of ARAF and enhanced downstream activation of MEK1/2 and ERK1/2; pharmacological inhibition of TFF3 dimerization (AMPC) combined with MEK1/2 inhibitors showed synergistic growth inhibition.","method":"Forced expression and siRNA depletion, western blot for ARAF/MEK/ERK, xenograft mouse model, small-molecule inhibitor (AMPC)","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss of function with downstream signaling characterization, in vivo xenograft, single lab","pmids":["31685806"],"is_preprint":false},{"year":2018,"finding":"TFF3 silencing in prostate cancer cells decreased BCL2, increased BAX, induced BAX translocation to mitochondria, elevated cytochrome C and Smac/DIABLO release, and activated caspase-3, -9 and PARP cleavage, demonstrating TFF3 blocks mitochondria-mediated (intrinsic) apoptosis.","method":"siRNA silencing of TFF3, western blot for BCL2/BAX/cytochrome C/Smac/caspases, mitochondrial fractionation, flow cytometry for apoptosis","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection of mitochondrial apoptosis pathway, multiple protein markers, single lab","pmids":["30139961"],"is_preprint":false},{"year":2017,"finding":"TFF3 mediates resistance to TNF-α/IFN-γ-induced apoptosis in colorectal adenocarcinoma cells via PI3K/AKT-dependent downregulation of miR-491-5p, which results in accumulation of lncRNA PRINS; PRINS co-localizes with and immunoprecipitates with PMAIP1 (NOXA), inhibiting apoptosis.","method":"siRNA gain/loss-of-function, pharmacological PI3K/AKT inhibition, immunoprecipitation of lncRNA-protein complex, miRNA and lncRNA profiling","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunoprecipitation of RNA-protein complex, pathway inhibition, multiple functional endpoints, single lab","pmids":["28149533"],"is_preprint":false},{"year":2019,"finding":"TFF3 overexpression in retinoblastoma cells activates p53, induces miR-34a, and reduces EMP1 expression; caspase-3-dependent apoptosis is triggered by TFF3, and EMP1 knockdown phenocopies TFF3-mediated growth suppression, placing TFF3 upstream of p53/miR-34a/EMP1 in a tumor suppressive pathway in retinoblastoma.","method":"pG13-luciferase reporter assay for p53, western blot, WST-1/BrdU/DAPI assays, caspase inhibition, CAM assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay for p53 activation, RNAi epistasis, multiple growth/apoptosis assays, single lab","pmids":["31450568"],"is_preprint":false},{"year":2012,"finding":"TFF3 activates Akt by phosphorylation of EGFR in colonic epithelial cells infected with Shigella dysenteriae; TFF3-activated Akt phosphorylates/inactivates GSK-3β, preventing β-catenin ubiquitylation and promoting its nuclear translocation, which induces MUC5AC and cyclin D1 expression; TFF3 also downregulates E-cadherin.","method":"Western blot for EGFR phosphorylation and downstream signaling, β-catenin localization, mRNA/protein expression in HT29MTX cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-specific western blots tracing full signaling cascade, multiple cell lines, single lab","pmids":["22389405"],"is_preprint":false},{"year":2021,"finding":"TFF3 activates NF-κB/COX2 signaling to induce PMN-MDSC activation; prostaglandin E2 is a major TFF3-mediated MDSC target; TFF3-derived PMN-MDSCs attenuate necrotizing enterocolitis in a T-cell-dependent manner (NEC severity was not reduced in Rag1 KO mice given TFF3-MDSCs, but was rescued by co-injection with CD4+ T cells).","method":"In vitro MDSC induction assays, NF-κB/COX2 pathway analysis, Rag1 KO mouse adoptive transfer, CD4+ T cell co-injection rescue","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via Rag1 KO rescue experiment, in vitro pathway analysis, single lab","pmids":["33547649"],"is_preprint":false},{"year":2018,"finding":"TFF3 contributes to EMT in papillary thyroid carcinoma cells by activating the MAPK/ERK signaling pathway, affecting Snail and Slug transcription factor expression and altering E-cadherin/N-cadherin levels; TFF3 knockdown inhibited proliferation, adhesion, colony formation, migration and invasion of TPC-1 cells.","method":"shRNA knockdown, western blot, qRT-PCR, wound-healing, Transwell invasion assays, IHC in clinical specimens","journal":"Journal of Cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — knockdown with functional assays but MAPK/ERK pathway assignment is inferential without pharmacological confirmation","pmids":["30519349"],"is_preprint":false},{"year":2017,"finding":"TFF3 negatively regulates HER2 signaling in HER2+/ER+ breast cancer cells; HER2 activation decreases TFF3 expression, trastuzumab treatment increases TFF3 expression partially in an ERα-independent manner, and forced TFF3 expression activates all HER family receptors (HER1-4), suggesting a feedback loop.","method":"Western blot, siRNA depletion, small molecule TFF3 inhibitor, trastuzumab treatment, HER receptor phosphorylation analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal regulation demonstrated by gain/loss of function, HER receptor phosphorylation assays, single lab","pmids":["29088778"],"is_preprint":false},{"year":2019,"finding":"Human salivary TFF3 exists in high-molecular-mass form as a heterodimer with FCGBP and in low-molecular-mass forms as homodimeric TFF3 and a C-terminally truncated form, as characterized by FPLC and proteomics.","method":"Fast protein liquid chromatography (FPLC), proteomics/mass spectrometry","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical fractionation and MS identification confirming TFF3-FCGBP heterodimer in saliva, single lab","pmids":["31658587"],"is_preprint":false},{"year":2009,"finding":"TLR2 activation selectively induces TFF3 synthesis in goblet cells; the colitis-associated TLR2-R753Q variant is functionally deficient in inducing TFF3 synthesis, leading to impaired wound healing; recombinant TFF3 rescues TLR2-deficient mice from increased morbidity/mortality during colonic injury, demonstrating TFF3 as the effector of TLR2-mediated mucosal protection.","method":"Quantitative RT-PCR, western blotting, confocal microscopy, TFF3-/- and TLR2-/- mice, DSS colitis model, oral TFF3 rescue treatment, TLR2-R753Q overexpression and wounding assay in Caco-2 cells","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue, multiple knockout models, in vitro and in vivo epistasis, multiple orthogonal methods","pmids":["19303021"],"is_preprint":false},{"year":2015,"finding":"TFF3 forced expression in mammary carcinoma cells promotes HUVEC proliferation, survival, invasion and tubule formation (angiogenesis) both directly and indirectly via STAT3-mediated IL-8 transcription; antibody inhibition of IL-8 or inhibition of its receptor CXCR2 partially abrogated TFF3-stimulated HUVEC angiogenesis; STAT3 depletion partially diminished TFF3's angiogenic capability.","method":"Forced TFF3 expression, siRNA depletion, HUVEC co-culture angiogenesis assays, IL-8 antibody neutralization, CXCR2 inhibition, STAT3 siRNA, in vivo tumor microvessel density","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple co-culture and in vivo assays, pharmacological and RNAi pathway dissection, single lab","pmids":["26559818"],"is_preprint":false},{"year":1996,"finding":"The TFF3 gene (hITF) maps to chromosome 21q22.3, tightly linked to TFF1 (pS2/BCEI) and TFF2 (hSP/SML1) genes, as determined by somatic cell hybrid panel mapping and fluorescence in situ hybridization with pulsed-field gel electrophoresis.","method":"Somatic cell hybrid panel PCR, FISH, pulsed-field gel electrophoresis","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 / Strong — FISH with somatic cell hybrids and physical mapping, replicated by two independent studies (PMIDs 8833157 and 8641134)","pmids":["8833157","8641134"],"is_preprint":false},{"year":2018,"finding":"SPDEF transcription factor directly binds the TFF3 promoter and regulates TFF3 expression; nucleotide treatment of intestinal epithelial cells induces SPDEF expression and downstream TFF3, which activates PI3K/Akt, ERK1/2, p38, and JAK/STAT pathways to improve intestinal barrier function.","method":"Chromatin immunoprecipitation (ChIP) for SPDEF-TFF3 promoter binding, siRNA, western blot, TER measurement","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct promoter binding, functional TER readout, single lab","pmids":["29555969"],"is_preprint":false}],"current_model":"TFF3 is a secreted trefoil-domain peptide predominantly released by goblet cells as a disulfide-linked heterodimer with FCGBP (releasable by H2S) that maintains mucosal integrity and promotes wound healing by binding cell-surface receptors LINGO2 (de-repressing EGFR signaling) and CD147 (activating STAT3/COX-2/PGE2), engaging CXCR4/CXCR7 for motogenic responses, and activating ERK, PI3K/AKT, JAK/STAT3, and NF-κB pathways to drive collective cell migration, inhibit apoptosis via the mitochondrial pathway, modulate tight junction composition (claudin-1/2), and downregulate E-cadherin; its transcription is induced by TLR2 activation, HIF-1 under hypoxia, IL-6/STAT3, and CDX2, and repressed by TNF-α/NF-κB, and it plays additional roles in hepatic glucose homeostasis downstream of GALE and in immune modulation via PMN-MDSCs through NF-κB/COX2."},"narrative":{"mechanistic_narrative":"TFF3 is a secreted trefoil-domain peptide that maintains mucosal integrity and drives epithelial wound healing, and which exerts context-dependent oncogenic and tumor-suppressive effects in malignant cells [PMID:31562318, PMID:19303021, PMID:15665295]. In the intestinal mucus layer it is stored predominantly as a high-molecular-weight heteromer disulfide-linked to FCGBP (and to MUC2 C-terminal domains), with the active monomer/dimer releasable by hydrogen sulfide; this complex assembly is conserved across colonic and salivary secretions [PMID:20423149, PMID:21629776, PMID:31658587]. TFF3 signals through distinct cell-surface receptors: it binds LINGO2 to disrupt inhibitory EGFR–LINGO2 complexes and de-repress EGFR signaling, and binds CD147 to enhance CD147–CD44s interaction, driving STAT3 activation and COX-2/PGE2 production [PMID:31562318, PMID:34262017]. Downstream it engages overlapping ERK, PI3K/AKT, and JAK/STAT3 cascades to drive collective cell migration, with CXCR4/CXCR7 required for the motogenic response [PMID:27616044, PMID:22389405, PMID:26780310]. These pathways converge on barrier and migration effectors—TFF3 remodels tight junctions by raising claudin-1 and lowering claudin-2, downregulates E-cadherin transcriptionally and post-translationally, and phosphorylates the planar-cell-polarity effector Vangl1 to promote restitution [PMID:17018241, PMID:15177884, PMID:16410243]. TFF3 inhibits intrinsic mitochondrial apoptosis by maintaining BCL2 over BAX and blocking cytochrome C/Smac release [PMID:30139961]. Its transcription is induced by TLR2 in goblet cells, by HIF-1 under hypoxia, by IL-6/STAT3, and by the transcription factors CDX2 and SPDEF, and is repressed by TNF-α via NF-κB [PMID:19303021, PMID:19076725, PMID:20229017, PMID:17182120, PMID:29555969, PMID:12912861]. Beyond the epithelium, TFF3 suppresses hepatic gluconeogenesis downstream of GALE to improve glucose tolerance, and induces NF-κB/COX2-dependent PMN-MDSC activity in immune modulation [PMID:24086476, PMID:28877911, PMID:33547649].","teleology":[{"year":1996,"claim":"Establishing the genomic location placed TFF3 within a tightly linked trefoil-peptide gene cluster, framing it as one member of a coordinately organized family.","evidence":"Somatic cell hybrid PCR, FISH, and pulsed-field gel mapping to 21q22.3","pmids":["8833157","8641134"],"confidence":"High","gaps":["Does not address protein function or regulation","No link between physical clustering and coordinate expression"]},{"year":2001,"claim":"Resolving how TFF3 is released showed its secretion is under enteric nervous and immune control and that luminal TFF3 already exists as a disulfide-linked complex.","evidence":"Isolated vascularly perfused rat colon with pharmacological secretagogues, radioimmunoassay, gel chromatography","pmids":["11495677"],"confidence":"Medium","gaps":["Identity of the disulfide partner not yet defined","Mechanism coupling neural/immune signals to secretion unknown"]},{"year":2003,"claim":"Demonstrating saturable basolateral binding of dimeric TFF3 to specific cells provided early evidence for a receptor-mediated mode of action distinct for the dimer.","evidence":"Intravenous 125I-TFF3 in rats with autoradiography and cold-ligand displacement","pmids":["12972324"],"confidence":"Medium","gaps":["Molecular identity of the binding site not determined","Functional consequence of binding not tested"]},{"year":2005,"claim":"Identifying STAT3 and ERK/NF-κB as effectors connected TFF3 to invasion and inflammatory gene control, establishing it as an upstream activator of these cascades.","evidence":"Phospho-STAT3 western blot, siRNA, pharmacological inhibition, Matrigel invasion, xenograft; NF-κB reporter assays and Twist silencing","pmids":["15665295","16014704"],"confidence":"High","gaps":["Receptor coupling TFF3 to STAT3/ERK not identified in these studies","Crosstalk between the two pathways not yet dissected"]},{"year":2006,"claim":"Linking TFF3 to Vangl1 phosphorylation and to claudin remodeling defined concrete effectors for its migratory and barrier-tightening functions.","evidence":"Phosphoproteomics with siRNA/overexpression and wound assays; stable TFF3 expression with claudin westerns and transepithelial resistance","pmids":["16410243","17018241"],"confidence":"High","gaps":["Kinase phosphorylating Vangl1 not identified","Mechanism linking claudin switch to resistance change unresolved"]},{"year":2009,"claim":"Showing TLR2 selectively induces goblet-cell TFF3 and that recombinant TFF3 rescues TLR2-deficient mice established TFF3 as the effector of innate-immune-driven mucosal protection.","evidence":"TFF3-/- and TLR2-/- mice, DSS colitis, oral TFF3 rescue, TLR2-R753Q variant wounding assay","pmids":["19303021"],"confidence":"High","gaps":["Signaling between TLR2 and the TFF3 promoter not mapped","Receptor mediating the protective TFF3 response not identified here"]},{"year":2010,"claim":"Biochemical purification identified FCGBP as the disulfide partner of intestinal TFF3 and showed H2S can liberate active peptide, explaining the storage-and-release logic of mucosal TFF3.","evidence":"Colonic TFF3 purification, LC-ESI-MS/MS, in vitro H2S reduction; parallel rat work showing TFF3-FCGBP-MUC2 heteropolymers disrupted by DTT","pmids":["20423149","21629776"],"confidence":"High","gaps":["Physiological source/regulation of H2S release unresolved","Whether complexed TFF3 is inactive in vivo not established"]},{"year":2013,"claim":"Defining DMBT1 binding specificity for dimeric TFF3 and revealing a hepatic glucose-lowering function expanded TFF3 partners and physiological scope beyond mucosa.","evidence":"Calcium-dependent ELISA binding with recombinant TFF3 forms; adenoviral Tff3 overexpression in hepatocytes and diabetic/obese mice with GTT/ITT","pmids":["23691218","24086476"],"confidence":"Medium","gaps":["DMBT1-TFF3 functional consequence not tested","Receptor mediating hepatic glucose effect unidentified"]},{"year":2016,"claim":"Dissecting receptor and pathway requirements showed CXCR4/CXCR7 are needed for motogenesis while ERK and JAK/STAT3 act in parallel with crosstalk to drive migration and E-cadherin loss.","evidence":"Receptor blocking and migration assays in conjunctival cells; 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induced by TFF3 in oral keratinocytes.","date":"2009","source":"European journal of oral sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19758246","citation_count":19,"is_preprint":false},{"pmid":"25691144","id":"PMC_25691144","title":"Differential regional and cellular distribution of TFF3 peptide in the human brain.","date":"2015","source":"Amino acids","url":"https://pubmed.ncbi.nlm.nih.gov/25691144","citation_count":19,"is_preprint":false},{"pmid":"18506086","id":"PMC_18506086","title":"Trefoil factor 3 (TFF3): a promising indicator for diagnosing thyroid follicular carcinoma.","date":"2008","source":"Endocrine journal","url":"https://pubmed.ncbi.nlm.nih.gov/18506086","citation_count":19,"is_preprint":false},{"pmid":"29088778","id":"PMC_29088778","title":"Release of HER2 repression of trefoil factor 3 (TFF3) expression mediates trastuzumab resistance in HER2+/ER+ mammary 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inhibitor.","date":"1999","source":"Biopolymers","url":"https://pubmed.ncbi.nlm.nih.gov/10380345","citation_count":16,"is_preprint":false},{"pmid":"37858772","id":"PMC_37858772","title":"Small molecule inhibition of TFF3 overcomes tamoxifen resistance and enhances taxane efficacy in ER+ mammary carcinoma.","date":"2023","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/37858772","citation_count":15,"is_preprint":false},{"pmid":"12663147","id":"PMC_12663147","title":"Ontogeny and prenatal expression of trefoil factor 3/ITF in the human intestine.","date":"2003","source":"Early human development","url":"https://pubmed.ncbi.nlm.nih.gov/12663147","citation_count":15,"is_preprint":false},{"pmid":"29555969","id":"PMC_29555969","title":"Nucleotide-mediated SPDEF modulates TFF3-mediated wound healing and intestinal barrier function during the weaning process.","date":"2018","source":"Scientific 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membrane of intestinal epithelial cells (co-immunoprecipitation and co-localization), and TFF3-LINGO2 interactions disrupt inhibitory EGFR-LINGO2 complexes, resulting in enhanced EGFR signaling that mediates TFF3's anti-apoptotic and wound healing functions.\",\n      \"method\": \"Co-immunoprecipitation, co-localization, Lingo2 knockout mice, apoptosis assays, colitis and helminth infection models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, genetic knockout model, multiple orthogonal functional assays, clear mechanistic pathway defined\",\n      \"pmids\": [\"31562318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CD147 (a membrane protein) was identified as a binding partner for TFF3; TFF3 binding to CD147 enhances CD147-CD44s interaction, leading to STAT3 activation and PTGS2 (COX-2) expression, which drives migration, proliferation, invasion and generates PGE2 that acts via PTGER4. Solution NMR identified key TFF3 residues critical for CD147 binding.\",\n      \"method\": \"Co-immunoprecipitation, competitive inhibitory antibodies, siRNA knockdown, xenograft mouse model, solution NMR\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure-function, reciprocal co-IP, mutagenesis of binding residues, multiple orthogonal functional assays in vitro and in vivo\",\n      \"pmids\": [\"34262017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human intestinal TFF3 exists predominantly as a high-molecular-weight heteromer disulfide-linked to FCGBP (IgG Fc binding protein) in colonic extracts; this complex can be dissociated in vitro by hydrogen sulfide (H2S), releasing biologically active TFF3 monomer/dimer forms.\",\n      \"method\": \"Purification of colonic TFF3, LC-ESI-MS/MS identification of FCGBP as partner, in vitro H2S reduction assay\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical purification, MS identification, in vitro dissociation assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20423149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rat TFF3, IgGFcγBP and Muc2 C-terminal domains are bound together by covalent (disulfide) interactions in the soluble fraction of intestinal mucus, forming heteropolymers in both the loose and firm mucus layers; co-immunoprecipitation confirmed these interactions, which are disrupted by DTT.\",\n      \"method\": \"Western blotting under reducing/non-reducing conditions, co-immunoprecipitation, immunostaining\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and biochemical fractionation, single lab, two orthogonal methods confirming covalent TFF3-FCGBP-MUC2 complex\",\n      \"pmids\": [\"21629776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DMBT1(gp340) binds specifically to dimeric TFF3 (but not monomeric TFF3, monomeric TFF2 or glycosylated TFF2) in a calcium-dependent manner, as shown by ELISA binding assay.\",\n      \"method\": \"ELISA binding assay with recombinant TFF3 forms, monoclonal antibody characterization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — solid-phase binding ELISA, specificity for dimer vs monomer characterized, single lab\",\n      \"pmids\": [\"23691218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Van Gogh-like protein 1 (Vangl1) is Ser/Thr phosphorylated in response to ITF/TFF3 stimulation; Vangl1 overexpression enhances ITF-stimulated wound closure in intestinal epithelial cells, and siRNA knockdown of Vangl1 inhibits the migratory response to ITF, identifying Vangl1 as a downstream effector of TFF3 signaling in mucosal repair.\",\n      \"method\": \"Immunoprecipitation of phosphoproteins + mass spectrometry identification, siRNA knockdown, overexpression, wound closure assays, confocal microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomic identification, gain- and loss-of-function with specific wound-healing readout, multiple orthogonal methods\",\n      \"pmids\": [\"16410243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TFF3 activates STAT3 signaling via Tyr705 phosphorylation of both STAT3α and STAT3β isoforms in colorectal cancer cells; blockade of STAT3 signaling abrogates TFF3-induced cellular invasion, establishing TFF3 as an activator of STAT3-dependent invasion.\",\n      \"method\": \"Western blot for phospho-STAT3, siRNA depletion of STAT3, pharmacological STAT3 inhibition, Matrigel invasion assay, tumor xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-specific western blot, RNAi, pharmacological inhibition, in vivo xenograft, multiple orthogonal methods in one study\",\n      \"pmids\": [\"15665295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TFF3 triggers transient NF-κB activation and prolonged upregulation of Twist protein via an ERK kinase-mediated pathway in intestinal epithelial cells, in contrast to TNF-α which causes persistent NF-κB activation and Twist degradation via the proteasome; TFF3-induced Twist prevents IL-8 production downstream of NF-κB.\",\n      \"method\": \"NF-κB reporter assays, western blotting, siRNA silencing of Twist, IL-8 ELISA, pharmacological MEK inhibition\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays, RNAi, pharmacological inhibition, single lab with multiple methods\",\n      \"pmids\": [\"16014704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TFF3-induced cell migration in conjunctival epithelial cells requires CXCR4 and CXCR7 (chemokine receptors); blocking CXCR4 and/or CXCR7 completely suppressed TFF3-stimulated migration, while ERK1/2 pathway activation by TFF3 was independent of CXCR4/CXCR7 signaling.\",\n      \"method\": \"X-ray structure-based molecular modeling, flow cytometry, receptor blocking assays, migration assays, western blot for ERK activation\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — receptor blocking functional assay and structural modeling, single lab, migration assay with mechanistic dissection of ERK vs receptor dependence\",\n      \"pmids\": [\"26780310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TFF3 reduces E-cadherin levels in intestinal epithelial cells through two distinct mechanisms: transcriptional downregulation of E-cadherin (shown by RT-PCR) and increased E-cadherin degradation (shown by pulse-chase experiments), with concomitant reduction of α- and β-catenin levels.\",\n      \"method\": \"FLAG-hTFF3 stable transfection, multiplex RT-PCR, methylation-specific PCR, pulse-chase experiments\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pulse-chase for post-translational mechanism, RT-PCR for transcriptional mechanism, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"15177884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TFF3 expression in stably transfected HT29/B6 and MDCK cells increases claudin-1 levels, decreases claudin-2 levels, and increases transepithelial resistance in confluent monolayers, indicating TFF3 regulates intestinal barrier function by altering tight junction claudin composition.\",\n      \"method\": \"Stable transfection of FLAG-hTFF3, western blotting for claudins and tight junction proteins, transepithelial resistance measurement\",\n      \"journal\": \"Peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable expression model with functional TER readout and protein quantification, single lab, two orthogonal methods\",\n      \"pmids\": [\"17018241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TFF3 secretion from the isolated vascularly perfused rat colon is induced by bethanechol, VIP, bombesin, IL-1β, and degranulator compound bromolasalocid, but not by somatostatin, neurotensin, or PYY, indicating TFF3 release is regulated by the enteric nervous system and resident immune cells; colonic TFF3 is present in a disulfide-linked complex in luminal effluent.\",\n      \"method\": \"Isolated vascularly perfused rat colon preparation, radioimmunoassay, gel chromatography\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo perfusion system, specific pharmacological stimuli, RIA quantification, single lab\",\n      \"pmids\": [\"11495677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TNF-α reduces TFF3 expression up to 10-fold in colonic tumor cells via NF-κB activation; NF-κB directly represses TFF3 transcription as shown by reporter gene assays, and this repression is reversible by IκB overexpression; in vivo, increased NF-κB expression in colitis coincides with reduced TFF3.\",\n      \"method\": \"Quantitative real-time PCR, reporter gene assays with NF-κB subunit overexpression and IκB co-expression, immunohistochemistry in rat colitis model\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter gene assay with co-expression, in vitro and in vivo data, single lab\",\n      \"pmids\": [\"12912861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Hypoxia-inducible factor-1 (HIF-1) mediates induction of TFF3 (and TFF1, TFF2) gene expression by hypoxia in gastric epithelial cells; siRNA knockdown of HIF-1α reduced TFF induction by hypoxia, and overexpression of HIF-1α in non-hypoxic cells induced TFF gene expression and transactivated a TFF1 reporter construct.\",\n      \"method\": \"HIF-1α siRNA transfection, HIF-1α overexpression, TFF1 reporter assay, qRT-PCR, in vivo aspirin-treated rat gastric damage model with hypoxyprobe immunostaining\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and overexpression of HIF-1α, reporter assay, in vitro and in vivo, single lab\",\n      \"pmids\": [\"19076725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IL-6 induces TFF3 expression in human biliary epithelial cells via STAT3 phosphorylation; STAT3 siRNA knockdown abrogates IL-6-induced TFF3 expression and cell migration, and exogenous TFF3 rescues migration defects caused by STAT3 silencing, placing TFF3 downstream of IL-6/STAT3 in a wound healing pathway.\",\n      \"method\": \"siRNA knockdown of STAT3, western blot for phospho-STAT3, RT-PCR, in vitro wound healing assay, rescue with exogenous TFF3\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with pathway rescue experiment, multiple readouts, single lab\",\n      \"pmids\": [\"20229017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CDX2 transcriptionally activates TFF3; CDX2 overexpression significantly upregulates TFF3 reporter gene transcription, EMSA identified at least two CDX-binding sites in the TFF3 promoter (with the proximal site at -63 being most important), and CDX2 stable transfection increased endogenous TFF3 mRNA.\",\n      \"method\": \"Transient transfection reporter assays, EMSA, deletion analysis, stable transfection with qRT-PCR for endogenous TFF3\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA for direct binding, reporter assay with deletion analysis, endogenous expression confirmation, single lab\",\n      \"pmids\": [\"17182120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TFF3 (ITF) simultaneously activates ERK and JAK/STAT3 signaling pathways in intestinal epithelial cells, with crosstalk between the two pathways; MEK inhibitor U0126 and JAK inhibitor AG490 each abolished TFF3-induced cell migration, MMP2/MMP9 upregulation, and E-cadherin degradation.\",\n      \"method\": \"Western blot for phospho-ERK and phospho-STAT3, pharmacological inhibition (U0126, AG490), Transwell migration assay, qRT-PCR for MMPs, immunofluorescence for E-cadherin\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with multiple functional readouts, single lab\",\n      \"pmids\": [\"27616044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TFF3 signals through MAPK (JNK, p38, ERK1/2) and PI3K/PKB pathways in oral keratinocytes, as detected by phosphoprotein array; TFF3 stimulation induces changes in genes related to cell survival, growth/proliferation, and migration including transient upregulation of FOS and MYCBP2.\",\n      \"method\": \"Phosphoprotein array, mRNA microarray, RT-PCR validation\",\n      \"journal\": \"European journal of oral sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — array-based discovery, single lab, no loss-of-function validation or receptor identification\",\n      \"pmids\": [\"19758246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PI3-K/Akt pathway promotes TFF3 expression and MUC2 expression during intestinal goblet cell differentiation; pharmacological PI3-K inhibition (LY294002) profoundly reduced TFF3 and MUC2 expression and mucin granule content, while MEK inhibition did not affect differentiation.\",\n      \"method\": \"PI3-K activity assay, LY294002 and PD98059 pharmacological inhibition, RT-PCR, Northern blot, RIA, dominant negative STAT6 transfection\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with multiple TFF3 readouts, dominant-negative approach for STAT6 exclusion, single lab\",\n      \"pmids\": [\"15733066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Overexpression of Tff3 in primary mouse hepatocytes inhibited gluconeogenic gene expression (G6pc, PEPCK, PGC-1α) and decreased glucose output; adenovirus-mediated Tff3 overexpression in diabetic/obese mice improved glucose tolerance and insulin sensitivity.\",\n      \"method\": \"Adenovirus-mediated overexpression in primary hepatocytes and in vivo, glucose tolerance test (GTT), insulin tolerance test (ITT), gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo overexpression with metabolic readouts, single lab\",\n      \"pmids\": [\"24086476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hepatic GALE overexpression impairs glucose tolerance via downregulation of Tff3; restoration of Tff3 expression in GALE-overexpressing mice corrected glucose intolerance, placing Tff3 downstream of GALE in a hepatic glucose homeostasis pathway.\",\n      \"method\": \"Inducible tissue-specific mouse model, transcriptional profiling, Tff3 restoration rescue experiment, glucose tolerance tests\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via rescue experiment, in vivo mouse model, single lab\",\n      \"pmids\": [\"28877911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Injected radiolabeled TFF3 dimer (but not monomer to the same extent in the stomach) binds specifically to TFF2-immunoreactive cells in the gastrointestinal tract at basolateral sites with receptor-like activity; binding is saturable (displaced by excess unlabeled TFF3) and distinct from TFF1/TFF3-immunoreactive cells.\",\n      \"method\": \"Intravenous injection of 125I-TFF3 in rats, gamma counting, autoradiography, displacement with excess unlabeled peptide, TCA precipitation\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — radiolabeled ligand binding with saturability demonstration, autoradiographic localization, single lab\",\n      \"pmids\": [\"12972324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TFF3 and EGF induce different cell migration patterns in intestinal epithelial cells: TFF3 promotes collective sheet migration with continuous coverage, while EGF induces network-like migration with gaps; both treatments trigger E-cadherin internalization/recycling.\",\n      \"method\": \"Scratch wound assay, time-lapse video microscopy, morphometry, immunocytochemistry/confocal microscopy\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with quantitative morphometry and protein localization, single lab\",\n      \"pmids\": [\"17762162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TFF3 exerts oncogenic function in lung adenocarcinoma through upregulation of ARAF and enhanced downstream activation of MEK1/2 and ERK1/2; pharmacological inhibition of TFF3 dimerization (AMPC) combined with MEK1/2 inhibitors showed synergistic growth inhibition.\",\n      \"method\": \"Forced expression and siRNA depletion, western blot for ARAF/MEK/ERK, xenograft mouse model, small-molecule inhibitor (AMPC)\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss of function with downstream signaling characterization, in vivo xenograft, single lab\",\n      \"pmids\": [\"31685806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TFF3 silencing in prostate cancer cells decreased BCL2, increased BAX, induced BAX translocation to mitochondria, elevated cytochrome C and Smac/DIABLO release, and activated caspase-3, -9 and PARP cleavage, demonstrating TFF3 blocks mitochondria-mediated (intrinsic) apoptosis.\",\n      \"method\": \"siRNA silencing of TFF3, western blot for BCL2/BAX/cytochrome C/Smac/caspases, mitochondrial fractionation, flow cytometry for apoptosis\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection of mitochondrial apoptosis pathway, multiple protein markers, single lab\",\n      \"pmids\": [\"30139961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TFF3 mediates resistance to TNF-α/IFN-γ-induced apoptosis in colorectal adenocarcinoma cells via PI3K/AKT-dependent downregulation of miR-491-5p, which results in accumulation of lncRNA PRINS; PRINS co-localizes with and immunoprecipitates with PMAIP1 (NOXA), inhibiting apoptosis.\",\n      \"method\": \"siRNA gain/loss-of-function, pharmacological PI3K/AKT inhibition, immunoprecipitation of lncRNA-protein complex, miRNA and lncRNA profiling\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — immunoprecipitation of RNA-protein complex, pathway inhibition, multiple functional endpoints, single lab\",\n      \"pmids\": [\"28149533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TFF3 overexpression in retinoblastoma cells activates p53, induces miR-34a, and reduces EMP1 expression; caspase-3-dependent apoptosis is triggered by TFF3, and EMP1 knockdown phenocopies TFF3-mediated growth suppression, placing TFF3 upstream of p53/miR-34a/EMP1 in a tumor suppressive pathway in retinoblastoma.\",\n      \"method\": \"pG13-luciferase reporter assay for p53, western blot, WST-1/BrdU/DAPI assays, caspase inhibition, CAM assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay for p53 activation, RNAi epistasis, multiple growth/apoptosis assays, single lab\",\n      \"pmids\": [\"31450568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TFF3 activates Akt by phosphorylation of EGFR in colonic epithelial cells infected with Shigella dysenteriae; TFF3-activated Akt phosphorylates/inactivates GSK-3β, preventing β-catenin ubiquitylation and promoting its nuclear translocation, which induces MUC5AC and cyclin D1 expression; TFF3 also downregulates E-cadherin.\",\n      \"method\": \"Western blot for EGFR phosphorylation and downstream signaling, β-catenin localization, mRNA/protein expression in HT29MTX cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-specific western blots tracing full signaling cascade, multiple cell lines, single lab\",\n      \"pmids\": [\"22389405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TFF3 activates NF-κB/COX2 signaling to induce PMN-MDSC activation; prostaglandin E2 is a major TFF3-mediated MDSC target; TFF3-derived PMN-MDSCs attenuate necrotizing enterocolitis in a T-cell-dependent manner (NEC severity was not reduced in Rag1 KO mice given TFF3-MDSCs, but was rescued by co-injection with CD4+ T cells).\",\n      \"method\": \"In vitro MDSC induction assays, NF-κB/COX2 pathway analysis, Rag1 KO mouse adoptive transfer, CD4+ T cell co-injection rescue\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via Rag1 KO rescue experiment, in vitro pathway analysis, single lab\",\n      \"pmids\": [\"33547649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TFF3 contributes to EMT in papillary thyroid carcinoma cells by activating the MAPK/ERK signaling pathway, affecting Snail and Slug transcription factor expression and altering E-cadherin/N-cadherin levels; TFF3 knockdown inhibited proliferation, adhesion, colony formation, migration and invasion of TPC-1 cells.\",\n      \"method\": \"shRNA knockdown, western blot, qRT-PCR, wound-healing, Transwell invasion assays, IHC in clinical specimens\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — knockdown with functional assays but MAPK/ERK pathway assignment is inferential without pharmacological confirmation\",\n      \"pmids\": [\"30519349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TFF3 negatively regulates HER2 signaling in HER2+/ER+ breast cancer cells; HER2 activation decreases TFF3 expression, trastuzumab treatment increases TFF3 expression partially in an ERα-independent manner, and forced TFF3 expression activates all HER family receptors (HER1-4), suggesting a feedback loop.\",\n      \"method\": \"Western blot, siRNA depletion, small molecule TFF3 inhibitor, trastuzumab treatment, HER receptor phosphorylation analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal regulation demonstrated by gain/loss of function, HER receptor phosphorylation assays, single lab\",\n      \"pmids\": [\"29088778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human salivary TFF3 exists in high-molecular-mass form as a heterodimer with FCGBP and in low-molecular-mass forms as homodimeric TFF3 and a C-terminally truncated form, as characterized by FPLC and proteomics.\",\n      \"method\": \"Fast protein liquid chromatography (FPLC), proteomics/mass spectrometry\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical fractionation and MS identification confirming TFF3-FCGBP heterodimer in saliva, single lab\",\n      \"pmids\": [\"31658587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TLR2 activation selectively induces TFF3 synthesis in goblet cells; the colitis-associated TLR2-R753Q variant is functionally deficient in inducing TFF3 synthesis, leading to impaired wound healing; recombinant TFF3 rescues TLR2-deficient mice from increased morbidity/mortality during colonic injury, demonstrating TFF3 as the effector of TLR2-mediated mucosal protection.\",\n      \"method\": \"Quantitative RT-PCR, western blotting, confocal microscopy, TFF3-/- and TLR2-/- mice, DSS colitis model, oral TFF3 rescue treatment, TLR2-R753Q overexpression and wounding assay in Caco-2 cells\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue, multiple knockout models, in vitro and in vivo epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"19303021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TFF3 forced expression in mammary carcinoma cells promotes HUVEC proliferation, survival, invasion and tubule formation (angiogenesis) both directly and indirectly via STAT3-mediated IL-8 transcription; antibody inhibition of IL-8 or inhibition of its receptor CXCR2 partially abrogated TFF3-stimulated HUVEC angiogenesis; STAT3 depletion partially diminished TFF3's angiogenic capability.\",\n      \"method\": \"Forced TFF3 expression, siRNA depletion, HUVEC co-culture angiogenesis assays, IL-8 antibody neutralization, CXCR2 inhibition, STAT3 siRNA, in vivo tumor microvessel density\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple co-culture and in vivo assays, pharmacological and RNAi pathway dissection, single lab\",\n      \"pmids\": [\"26559818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The TFF3 gene (hITF) maps to chromosome 21q22.3, tightly linked to TFF1 (pS2/BCEI) and TFF2 (hSP/SML1) genes, as determined by somatic cell hybrid panel mapping and fluorescence in situ hybridization with pulsed-field gel electrophoresis.\",\n      \"method\": \"Somatic cell hybrid panel PCR, FISH, pulsed-field gel electrophoresis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — FISH with somatic cell hybrids and physical mapping, replicated by two independent studies (PMIDs 8833157 and 8641134)\",\n      \"pmids\": [\"8833157\", \"8641134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPDEF transcription factor directly binds the TFF3 promoter and regulates TFF3 expression; nucleotide treatment of intestinal epithelial cells induces SPDEF expression and downstream TFF3, which activates PI3K/Akt, ERK1/2, p38, and JAK/STAT pathways to improve intestinal barrier function.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) for SPDEF-TFF3 promoter binding, siRNA, western blot, TER measurement\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct promoter binding, functional TER readout, single lab\",\n      \"pmids\": [\"29555969\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TFF3 is a secreted trefoil-domain peptide predominantly released by goblet cells as a disulfide-linked heterodimer with FCGBP (releasable by H2S) that maintains mucosal integrity and promotes wound healing by binding cell-surface receptors LINGO2 (de-repressing EGFR signaling) and CD147 (activating STAT3/COX-2/PGE2), engaging CXCR4/CXCR7 for motogenic responses, and activating ERK, PI3K/AKT, JAK/STAT3, and NF-κB pathways to drive collective cell migration, inhibit apoptosis via the mitochondrial pathway, modulate tight junction composition (claudin-1/2), and downregulate E-cadherin; its transcription is induced by TLR2 activation, HIF-1 under hypoxia, IL-6/STAT3, and CDX2, and repressed by TNF-α/NF-κB, and it plays additional roles in hepatic glucose homeostasis downstream of GALE and in immune modulation via PMN-MDSCs through NF-κB/COX2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TFF3 is a secreted trefoil-domain peptide that maintains mucosal integrity and drives epithelial wound healing, and which exerts context-dependent oncogenic and tumor-suppressive effects in malignant cells [#0, #32, #6]. In the intestinal mucus layer it is stored predominantly as a high-molecular-weight heteromer disulfide-linked to FCGBP (and to MUC2 C-terminal domains), with the active monomer/dimer releasable by hydrogen sulfide; this complex assembly is conserved across colonic and salivary secretions [#2, #3, #31]. TFF3 signals through distinct cell-surface receptors: it binds LINGO2 to disrupt inhibitory EGFR–LINGO2 complexes and de-repress EGFR signaling, and binds CD147 to enhance CD147–CD44s interaction, driving STAT3 activation and COX-2/PGE2 production [#0, #1]. Downstream it engages overlapping ERK, PI3K/AKT, and JAK/STAT3 cascades to drive collective cell migration, with CXCR4/CXCR7 required for the motogenic response [#16, #27, #8]. These pathways converge on barrier and migration effectors—TFF3 remodels tight junctions by raising claudin-1 and lowering claudin-2, downregulates E-cadherin transcriptionally and post-translationally, and phosphorylates the planar-cell-polarity effector Vangl1 to promote restitution [#10, #9, #5]. TFF3 inhibits intrinsic mitochondrial apoptosis by maintaining BCL2 over BAX and blocking cytochrome C/Smac release [#24]. Its transcription is induced by TLR2 in goblet cells, by HIF-1 under hypoxia, by IL-6/STAT3, and by the transcription factors CDX2 and SPDEF, and is repressed by TNF-α via NF-κB [#32, #13, #14, #15, #35, #12]. Beyond the epithelium, TFF3 suppresses hepatic gluconeogenesis downstream of GALE to improve glucose tolerance, and induces NF-κB/COX2-dependent PMN-MDSC activity in immune modulation [#19, #20, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the genomic location placed TFF3 within a tightly linked trefoil-peptide gene cluster, framing it as one member of a coordinately organized family.\",\n      \"evidence\": \"Somatic cell hybrid PCR, FISH, and pulsed-field gel mapping to 21q22.3\",\n      \"pmids\": [\"8833157\", \"8641134\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address protein function or regulation\", \"No link between physical clustering and coordinate expression\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Resolving how TFF3 is released showed its secretion is under enteric nervous and immune control and that luminal TFF3 already exists as a disulfide-linked complex.\",\n      \"evidence\": \"Isolated vascularly perfused rat colon with pharmacological secretagogues, radioimmunoassay, gel chromatography\",\n      \"pmids\": [\"11495677\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the disulfide partner not yet defined\", \"Mechanism coupling neural/immune signals to secretion unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating saturable basolateral binding of dimeric TFF3 to specific cells provided early evidence for a receptor-mediated mode of action distinct for the dimer.\",\n      \"evidence\": \"Intravenous 125I-TFF3 in rats with autoradiography and cold-ligand displacement\",\n      \"pmids\": [\"12972324\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular identity of the binding site not determined\", \"Functional consequence of binding not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying STAT3 and ERK/NF-κB as effectors connected TFF3 to invasion and inflammatory gene control, establishing it as an upstream activator of these cascades.\",\n      \"evidence\": \"Phospho-STAT3 western blot, siRNA, pharmacological inhibition, Matrigel invasion, xenograft; NF-κB reporter assays and Twist silencing\",\n      \"pmids\": [\"15665295\", \"16014704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor coupling TFF3 to STAT3/ERK not identified in these studies\", \"Crosstalk between the two pathways not yet dissected\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linking TFF3 to Vangl1 phosphorylation and to claudin remodeling defined concrete effectors for its migratory and barrier-tightening functions.\",\n      \"evidence\": \"Phosphoproteomics with siRNA/overexpression and wound assays; stable TFF3 expression with claudin westerns and transepithelial resistance\",\n      \"pmids\": [\"16410243\", \"17018241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase phosphorylating Vangl1 not identified\", \"Mechanism linking claudin switch to resistance change unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing TLR2 selectively induces goblet-cell TFF3 and that recombinant TFF3 rescues TLR2-deficient mice established TFF3 as the effector of innate-immune-driven mucosal protection.\",\n      \"evidence\": \"TFF3-/- and TLR2-/- mice, DSS colitis, oral TFF3 rescue, TLR2-R753Q variant wounding assay\",\n      \"pmids\": [\"19303021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling between TLR2 and the TFF3 promoter not mapped\", \"Receptor mediating the protective TFF3 response not identified here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biochemical purification identified FCGBP as the disulfide partner of intestinal TFF3 and showed H2S can liberate active peptide, explaining the storage-and-release logic of mucosal TFF3.\",\n      \"evidence\": \"Colonic TFF3 purification, LC-ESI-MS/MS, in vitro H2S reduction; parallel rat work showing TFF3-FCGBP-MUC2 heteropolymers disrupted by DTT\",\n      \"pmids\": [\"20423149\", \"21629776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological source/regulation of H2S release unresolved\", \"Whether complexed TFF3 is inactive in vivo not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defining DMBT1 binding specificity for dimeric TFF3 and revealing a hepatic glucose-lowering function expanded TFF3 partners and physiological scope beyond mucosa.\",\n      \"evidence\": \"Calcium-dependent ELISA binding with recombinant TFF3 forms; adenoviral Tff3 overexpression in hepatocytes and diabetic/obese mice with GTT/ITT\",\n      \"pmids\": [\"23691218\", \"24086476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DMBT1-TFF3 functional consequence not tested\", \"Receptor mediating hepatic glucose effect unidentified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Dissecting receptor and pathway requirements showed CXCR4/CXCR7 are needed for motogenesis while ERK and JAK/STAT3 act in parallel with crosstalk to drive migration and E-cadherin loss.\",\n      \"evidence\": \"Receptor blocking and migration assays in conjunctival cells; U0126/AG490 inhibition with migration, MMP, and E-cadherin readouts in intestinal cells\",\n      \"pmids\": [\"26780310\", \"27616044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CXCR4/CXCR7 bind TFF3 directly not shown\", \"Hierarchy among the multiple converging pathways unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying LINGO2 and CD147 as receptors gave TFF3 defined surface partners coupling it to EGFR de-repression and to STAT3/COX-2/PGE2 output.\",\n      \"evidence\": \"Reciprocal co-IP, Lingo2 knockout mice, apoptosis/colitis models (LINGO2); co-IP, NMR mapping, mutagenesis, xenograft (CD147)\",\n      \"pmids\": [\"31562318\", \"34262017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of LINGO2 vs CD147 across tissues not defined\", \"Structural basis of receptor selectivity for dimer vs monomer not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating TFF3-driven NF-κB/COX2 activation of PMN-MDSCs in a T-cell-dependent manner extended TFF3 function into adaptive-immune-coupled tissue protection.\",\n      \"evidence\": \"In vitro MDSC induction, NF-κB/COX2 analysis, Rag1 KO adoptive transfer with CD4+ T cell rescue in necrotizing enterocolitis\",\n      \"pmids\": [\"33547649\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor on MDSCs mediating TFF3 effect unknown\", \"Whether this operates in human disease untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single secreted peptide selects among LINGO2, CD147, and CXCR4/CXCR7 to produce opposing oncogenic versus tumor-suppressive outcomes across tissues.\",\n      \"evidence\": \"No single study in the corpus reconciles the divergent receptor usage and context-dependent phenotypes\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model of receptor selection\", \"Determinants of pro- vs anti-apoptotic outcome unknown\", \"Role of monomer/dimer/complex state in receptor choice not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2, 3, 11, 31]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 16, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [32, 28]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [24, 25]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [19, 20]}\n    ],\n    \"complexes\": [\n      \"TFF3-FCGBP heterodimer\",\n      \"TFF3-FCGBP-MUC2 heteropolymer\"\n    ],\n    \"partners\": [\n      \"LINGO2\",\n      \"CD147\",\n      \"FCGBP\",\n      \"MUC2\",\n      \"DMBT1\",\n      \"CXCR4\",\n      \"CXCR7\",\n      \"EGFR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}