{"gene":"TIMD4","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2007,"finding":"Tim4 (TIMD4) was identified as a phosphatidylserine (PS) receptor: its immunoglobulin domain directly binds PS on apoptotic cells and on expelled erythroid nuclei, mediating their phagocytic engulfment. Expression in fibroblasts conferred engulfment activity, and anti-Tim4 monoclonal antibody blocked engulfment in vitro and in vivo, causing autoantibody development in mice.","method":"Expression cloning; monoclonal antibody inhibition assay; fibroblast gain-of-function engulfment assay; in vivo antibody injection","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — expression cloning with functional rescue, in vitro binding assay, in vivo blockade with defined phenotype, independently replicated","pmids":["17960135"],"is_preprint":false},{"year":2007,"finding":"TIM-4 (and TIM-1) specifically bind PS on apoptotic cells (but no other phospholipid tested) via a conserved cavity in the IgV domain. Point mutations abolishing this cavity eliminated PS binding and phagocytosis. TIM-4-expressing peritoneal macrophages and transfected cells efficiently phagocytosed apoptotic cells, blocked by anti-TIM-4 mAbs mapping to the binding cavity.","method":"Phospholipid binding assays; site-directed mutagenesis of PS-binding cavity; phagocytosis assay with transfected cells; mAb epitope mapping","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis with functional readout (binding + phagocytosis), independent replication of PS-receptor identification","pmids":["18082433"],"is_preprint":false},{"year":2005,"finding":"TIM-4 (expressed on antigen-presenting cells) is the endogenous ligand for TIM-1 (expressed on T cells). TIM-4-Ig fusion protein costimulated T cell proliferation via CD3/CD28; in vivo administration of soluble TIM-1-Ig or TIM-4-Ig caused T cell hyperproliferation, establishing TIM-1/TIM-4 interaction as a regulator of T cell proliferation.","method":"Soluble Ig-fusion protein binding assays; in vitro T cell proliferation costimulation assay; in vivo administration of fusion proteins","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal ligand-receptor identification with functional in vitro and in vivo validation, widely cited and replicated","pmids":["15793576"],"is_preprint":false},{"year":2009,"finding":"TIM-4 functions as a PS tethering receptor without direct intracellular signaling: a TIM-4 mutant lacking its entire cytoplasmic tail still promoted apoptotic cell engulfment comparably to wild-type, and replacement of the transmembrane domain with a GPI anchor also supported engulfment. TIM-4-mediated uptake was independent of the ELMO1/Dock180/Rac and GULP signaling pathways, yet required an intact cytoskeleton.","method":"Dominant-negative mutants; siRNA knockdown of signaling components; knockout cell lines; cytoplasmic-tail deletion and GPI-anchor replacement constructs; cytoskeleton disruption drugs","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal loss-of-function approaches with domain-replacement mutagenesis in one rigorous study","pmids":["19217291"],"is_preprint":false},{"year":2014,"finding":"Tim4 and MerTK cooperate in a two-step mechanism for efferocytosis by resident peritoneal macrophages: Tim4 acts as a PS-binding tether that captures apoptotic cells, and this Tim4-dependent binding is required for subsequent MerTK-mediated tyrosine phosphorylation and internalization. Tim4-null macrophages had reduced binding and engulfment; MerTK-null macrophages bound but failed to engulf; Tim4 + MerTK co-expression in Ba/F3 cells reconstituted full engulfment activity.","method":"Neutralizing antibody inhibition; Tim4-null and MerTK-null macrophages; Ba/F3 reconstitution with Tim4 and/or MerTK; tyrosine phosphorylation assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockouts combined with reconstitution and phosphorylation assays, two complementary cell systems","pmids":["24515440"],"is_preprint":false},{"year":2014,"finding":"TIM4-driven phagocytosis requires integrin co-receptor activation: TIM4 associates with β1 integrins upon receptor clustering (single-particle detection), and phagocytosis depends on Src-family kinases, focal adhesion kinase (FAK), PI(3,4,5)P3 accumulation, Vav3 recruitment, and synergistic action of RhoA, Rac1, and Rac2. TIM4 operates independently of lactadherin as a bridging molecule.","method":"TIM4-/- bone marrow-derived macrophages vs. wild-type; heterologous expression in AD293 cells; gene silencing/ablation of signaling intermediates; single-particle detection of TIM4/β1 integrin association","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — two complementary genetic systems, multiple signaling inhibitors and knockouts, single-particle imaging, single lab but orthogonal methods","pmids":["24623723"],"is_preprint":false},{"year":2014,"finding":"TIM-4 on tumor-associated myeloid cells directly interacts with AMPKα1 and activates autophagy-mediated degradation of ingested tumor cells, leading to reduced antigen presentation and impaired CTL responses. Blockade of the TIM-4–AMPKα1–autophagy pathway enhanced antitumor CTL responses.","method":"Co-immunoprecipitation of TIM-4 and AMPKα1; autophagy assays; antigen presentation assays; tumor models with TIM-4 blockade","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP interaction and functional autophagy/antigen presentation assays in a single lab study","pmids":["24315994"],"is_preprint":false},{"year":2014,"finding":"Using interfacial X-ray scattering, molecular dynamics simulations, and membrane binding assays, Tim4 was shown to possess one Ca2+-coordinated primary PS binding pocket (IgV domain) plus four weaker ionic interaction sites, making Tim4 sensitive to PS surface density. This organization allows differential recognition of apoptotic cells (high PS) versus activated T cells (intermediate PS), unlike TIM-1 and TIM-3 which are less PS-density-sensitive.","method":"Interfacial X-ray scattering; molecular dynamics simulation; PS membrane-binding assays with varying PS density","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural/biophysical methods (X-ray scattering + MD simulation) combined with functional binding assays in a single rigorous study","pmids":["24706780"],"is_preprint":false},{"year":2008,"finding":"TIM-4 expressed on APCs specifically phosphorylates TIM-1 on T cells and induces signaling through LAT, Akt, and ERK1/2, promoting T cell expansion by enhancing cell division and reducing apoptosis.","method":"Anti-TIM-4 monoclonal antibodies; phosphorylation assays for TIM-1, LAT, Akt, ERK1/2; T cell proliferation and apoptosis assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — signaling assays with defined readouts in a single lab, functional T-cell expansion confirmed","pmids":["18354194"],"is_preprint":false},{"year":2019,"finding":"Tim4 alone does not support efferocytosis but enhances TAM-receptor (MERTK/Tyro3/Axl)-dependent efferocytosis in specific macrophage populations. ProS/Gas6 bridging molecules bind PtdSer and TAM receptors; Gas6 binds Axl strongly but ProS does not. Tim4 enhancement of TAM-mediated efferocytosis is population-specific: required by resident peritoneal macrophages, Kupffer cells, and CD169+ skin macrophages, but not by thioglycollate-elicited macrophages or primary microglia.","method":"NIH3T3-based cell lines expressing single TAM receptors; Tim4-null macrophages; multiple primary macrophage populations; recombinant ProS/Gas6 with Kd measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic systems (null cells, reconstitution), multiple primary macrophage populations, quantitative binding assays","pmids":["28768810"],"is_preprint":false},{"year":2019,"finding":"TIM4 and MERTK signal through distinct pathways: efferocytosis by resident peritoneal macrophages requires MEK/ERK, AKT, FAK, and STAT6 (but not NF-κB or STAT5), while MERTK-mediated proliferation in response to apoptotic cells additionally requires NF-κB and STAT5. The juxtamembrane and C-terminal regions of MERTK have redundant roles in efferocytosis. TIM4 and MERTK together enable apoptotic-cell-induced Ba/F3 cell proliferation in a PtdSer-dependent manner.","method":"Pathway inhibitors; MERTK domain mutagenesis; reconstituted Ba/F3 cell system with MERTK + TIM4; phosphorylation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reconstituted cell system with domain mutagenesis and pharmacological pathway dissection, single lab","pmids":["30846565"],"is_preprint":false},{"year":2020,"finding":"Tim-4 physically associates with Mertk via an interaction between the IgV domain of Tim-4 and the fibronectin type-III domain of Mertk. This interaction is required for Mertk to enhance Tim-4-mediated efferocytosis, as a soluble GST-MertkFnIII fragment that disrupts the interaction abolishes the enhancement.","method":"Immunoprecipitation; immunofluorescence and proximity ligation assay; domain-mapping with soluble GST-MertkFnIII competitor","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal domain-level interaction mapped by pulldown and PLA with functional competition assay, single lab","pmids":["32640697"],"is_preprint":false},{"year":2014,"finding":"In zebrafish microglia, TIM-4 is required specifically for phagosome stabilization during engulfment of dying neurons, while BAI1 controls phagosome formation and cargo transport. Loss of TIM-4 alone allows recognition of apoptotic targets but causes distinct clearance defects; combined BAI1 and TIM-4 activity is required for complete neuronal corpse removal.","method":"Live imaging of zebrafish embryo brain; genetic loss-of-function (TIM-4 and BAI1 morpholino/mutant); quantification of phagocytic stages","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live single-cell imaging in intact organism with genetic knockdown, defined cellular phenotypes, single lab","pmids":["24898390"],"is_preprint":false},{"year":2021,"finding":"Tim-4+ cavity-resident macrophages sequester viable cytotoxic CD8+ T cells away from tumor targets and suppress their proliferation through PS recognition, since anti-tumor CD8+ T cells upregulate PS exposure. Tim-4 blockade abrogates this sequestration and restores anti-tumor CD8+ T cell efficacy in mouse models.","method":"Flow cytometry of pleural effusions/ascites; in vivo Tim-4 blockade in anti-PD-1 and adoptive T cell therapy mouse models; PS exposure measurement on CD8+ T cells","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic in vivo blockade experiments with defined cellular readouts, single lab with multiple in vivo models","pmids":["34115989"],"is_preprint":false},{"year":2016,"finding":"Residues within the PS-binding pocket of the TIM-4 IgV domain (murine and human) are required for Ebola virus (EBOV) pseudovirion binding and entry. Mutagenesis identified 8 mTIM-4 and 14 hTIM-4 IgV domain residues critical for virion binding and internalization, with TIM-4-specific residues beyond those shared with TIM-1.","method":"Site-directed mutagenesis of TIM-4 IgV domain residues; VSV pseudovirion bearing EBOV glycoprotein entry assays; virus binding assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis screen with functional entry readout, single lab","pmids":["27122575"],"is_preprint":false},{"year":2021,"finding":"Tim4 recognizes multi-walled carbon nanotubes (MWCNTs) through aromatic-aromatic interactions between aromatic residues in the extracellular IgV domain and the carbon crystal surface. CRISPR-Cas9 deletion of Tim4 (but not Tim1) in peritoneal macrophages impaired MWCNT recognition and phagocytosis, and reduced granuloma formation in vivo. Docking simulations confirmed spatiotemporally stable interfaces.","method":"Targeted receptor screening; molecular docking simulation; CRISPR-Cas9 Tim4 deletion; phagocytosis assays; in vivo mesothelial MWCNT exposure model","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR genetic deletion with in vitro and in vivo phagocytosis readouts plus computational docking, single lab","pmids":["33567275"],"is_preprint":false},{"year":2023,"finding":"Tim4 binds polystyrene (PS) microparticles through extracellular aromatic cluster interactions (aromatic-aromatic), the same cluster involved in MWCNT recognition. Genetic deletion of Tim4 reduced macrophage engulfment of PS microplastics. PS microparticles competitively blocked Tim4-mediated efferocytosis of apoptotic cells, but PS microparticle engulfment did not activate NLRP3/IL-1β unlike MWCNTs.","method":"Tim4 knockout macrophages; competitive efferocytosis assay; cytokine secretion assays; comparison with MWCNT responses","journal":"The Science of the total environment","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic deletion with multiple functional assays, single lab","pmids":["36871719"],"is_preprint":false},{"year":2019,"finding":"Tim-4 in macrophages inhibits NLRP3 inflammasome activation via the LKB1/AMPKα pathway: Tim-4 physically interacts with LKB1 and AMPKα (shown by co-IP), promoting AMPKα phosphorylation and AMPKα-mediated autophagy-dependent degradation of NLRP3 components, reducing IL-1β and IL-18 release. The PS-binding IgV domain of Tim-4 is required for this LKB1/AMPKα interaction.","method":"Co-immunoprecipitation of Tim-4, LKB1, and AMPKα; Tim-4 knockout mice; NLRP3 inflammasome activation assays; autophagy assays; IgV domain mutants","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP interaction with genetic knockout and domain mutagenesis, multiple functional readouts, single lab","pmids":["31263038"],"is_preprint":false},{"year":2022,"finding":"Tim-4 disrupts the Insig1-SCAP interaction in macrophages, promoting SCAP-SREBP2 complex translocation to the Golgi apparatus and upregulation of cholesterol biosynthesis, which in turn limits type I IFN signaling. Tim-4 deficiency boosts IFN signaling and decreases viral load.","method":"Tim-4 knockout mice; co-immunoprecipitation of Insig1 and SCAP; SREBP2 activation assays; IFN pathway reporter assays; viral infection models","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — genetic knockout with Co-IP and defined molecular pathway readouts, single lab","pmids":["36450259"],"is_preprint":false},{"year":2020,"finding":"Tim-4 functions as a scavenger receptor for phagocytosis of exogenous bacterial particles (E. coli and S. aureus bioparticles) via a phosphatidylserine-independent mechanism. The IgV domain and mucin domain of Tim-4 (but not the cytoplasmic tail) are required for this scavenging activity. A PS-binding-deficient Tim-4 mutant (Tim-4AAA) still promoted bacterial particle phagocytosis. Tim-4 overexpression enhanced LPS binding.","method":"Tim-4 overexpression and knockout cell lines; domain deletion mutants; PS-binding-deficient mutant (Tim-4AAA); Anxa5 competition assay; LPS binding assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — domain mutagenesis with gain/loss-of-function, multiple particle types, single lab","pmids":["32703939"],"is_preprint":false},{"year":2015,"finding":"TIM-4 promotes non-small-cell lung cancer cell growth and proliferation through its RGD motif by interacting with αvβ3 integrin; RGD motif mutation abolishes TIM-4-induced proliferation in vitro and in xenograft models. Co-IP confirmed TIM-4–αvβ3 integrin interaction.","method":"Co-immunoprecipitation; RGD motif site-directed mutagenesis; cell proliferation assays (CCK-8, EdU); xenograft tumor model","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mutagenesis with Co-IP and in vivo xenograft, single lab","pmids":["26512878"],"is_preprint":false},{"year":2022,"finding":"N-glycosylation of TIM-4 at Asn291 stabilizes the protein; removal of this glycosylation increases TIM-4 susceptibility to ER-localized ubiquitin ligase-mediated ERAD degradation, decreasing TIM-4 surface expression and suppressing TIM-4-mediated metastasis in NSCLC cells.","method":"Site-directed mutagenesis of N-glycosylation site (Asn291); protein stability/degradation assays; ERAD pathway analysis; cell migration/invasion assays","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mutagenesis identifying specific PTM site with degradation and functional migration assays, single lab","pmids":["35433445"],"is_preprint":false},{"year":2023,"finding":"TIM-4 promotes mitochondrial fusion and oxidative phosphorylation in lung cancer cells via the ANXA2/PI3K/AKT/OPA1 axis: TIM-4 interacts with ANXA2 (co-IP), activating PI3K/AKT signaling to increase L-OPA1 protein expression, promoting mitochondrial fusion and OXPHOS-dependent proliferation. Inhibiting OXPHOS reversed TIM-4-induced proliferation.","method":"Co-immunoprecipitation of TIM-4 and ANXA2; PI3K/AKT pathway inhibitors; mitochondrial morphology assays; OPA1 expression analysis; OXPHOS inhibitor rescue experiments","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP interaction with pathway inhibitor experiments and defined molecular readouts, single lab","pmids":["36806050"],"is_preprint":false},{"year":2010,"finding":"Tim-4 deficiency in resident peritoneal macrophages (rPMs) significantly impairs binding and engulfment of apoptotic cells in vitro and in vivo, but does not affect phagocytosis of necrotic cells or opsonized targets. Tim-4 rapidly forms punctate caps upon contact with apoptotic cells. Tim-4 deficiency does not impair marginal zone trapping of apoptotic cells, tingible body macrophage clearance, or germinal center formation, but causes increased peritoneal cellularity and altered macrophage responses to LPS and TNF-α.","method":"Tim-4-/- mice; in vitro and in vivo phagocytosis assays; fluorescence microscopy of Tim-4 redistribution; peritoneal cellularity analysis; LPS/TNF-α response assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with in vitro and in vivo phagocytosis assays and multiple cell-type controls, well-replicated findings","pmids":["20421466"],"is_preprint":false},{"year":2012,"finding":"Tim4 deficiency specifically impairs resident peritoneal macrophage (but not thioglycollate-elicited macrophage) engulfment of apoptotic cells. Double deficiency of Tim4 and MFG-E8 causes age-dependent autoantibody production in female C57BL/6 mice, synergistically disrupting apoptotic cell clearance and immune homeostasis.","method":"Tim4-/- and Tim4-/-MFG-E8-/- double-knockout mice; peritoneal and thioglycollate-elicited macrophage engulfment assays; autoantibody measurement; anti-TNFα and pristane treatment","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-knockout epistasis with multiple in vivo immunological readouts, establishes pathway position","pmids":["22723547"],"is_preprint":false},{"year":2024,"finding":"TIM4-mediated engulfment by large peritoneal macrophages induces nucleation of F-actin around nascent phagosomes, delaying vacuolar ATPase recruitment, phagosomal acidification, and cargo degradation, thereby prolonging antigen integrity and facilitating cross-presentation of tumor-associated antigens to CD8+ T cells. In vivo, TIM4 deletion blunts early anti-tumor CD8+ T cell induction and accelerates peritoneal tumor progression.","method":"Live imaging of phagosome formation; F-actin/v-ATPase recruitment assays; cross-presentation assays; TIM4-knockout in vivo ovarian tumor model; PS-coated artificial targets","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with defined phagosomal readouts plus in vivo genetic deletion, single lab","pmids":["38607919"],"is_preprint":false},{"year":2021,"finding":"TIM4 on lung-resident cDC1 dendritic cells mediates capture and phagocytosis of cell-associated tumor antigens. Loss of TIM4 by conditional cDC1 deletion or TIM4 blockade impairs activation of tumor-specific CD8+ T cells and promotes lung tumor progression.","method":"Conditional TIM4 deletion in cDC1; TIM4 receptor blockade; cross-presentation and CD8+ T cell activation assays; lung tumor progression in mice","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional genetic deletion with defined immunological and tumor progression phenotypes, single lab","pmids":["33854047"],"is_preprint":false},{"year":2011,"finding":"TIM-4 inhibits naive T cell activation through a ligand other than TIM-1 (TIM-1-independent pathway), while it promotes expansion of pre-activated T cells. In vivo anti-TIM-4 antibody blockade suppressed T cell-mediated inflammatory responses despite enhanced antigen-specific T cell generation.","method":"TIM-4-Ig fusion protein stimulation of naive vs. pre-activated T cells; in vivo anti-TIM-4 blockade; adoptive transfer of primed T cells","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro and in vivo blockade experiments with defined T cell activation readouts, single lab","pmids":["18367551"],"is_preprint":false},{"year":2021,"finding":"Blocking the PS receptor Tim4 in adipose tissue macrophages inhibits lysosomal activation and the release of post-prandial high-density lipoprotein cholesterol following a high-fat meal. This implicates Tim4-dependent lysosomal function in resident adipose tissue macrophage regulation of cholesterol transport.","method":"Anti-Tim4 antibody blockade; chloroquine (lysosomal inhibitor) comparison; single-cell RNA sequencing; protected bone marrow chimeras; clodronate cell depletion; post-prandial lipid measurements","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — pharmacological and antibody blockade with scRNA-seq and chimera experiments, single lab with orthogonal approaches","pmids":["34290249"],"is_preprint":false},{"year":2025,"finding":"Efferocytosis by liver macrophages via TIM4 is impaired in MASH, driving fibrosis. TIM4 deletion or neutralization in Kupffer cells reduces apoptotic hepatocyte clearance and accelerates profibrotic hepatic stellate cell (HSC) activation. Genetic restoration of macrophage Timd4 or cell therapy with TIM4+ macrophages enhances clearance and reduces fibrosis. Mechanistically, TIM4-mediated efferocytosis reprograms macrophages to secrete IL-10, which activates the IL-10 receptor on HSCs to suppress their profibrotic activation.","method":"Timd4 conditional knockout in Kupffer cells; Timd4 genetic restoration; TIM4+ cell therapy; anti-TIM4 neutralizing antibodies; ex vivo macrophage-HSC co-culture; IL-10/IL-10R pathway assays","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic approaches (knockout, restoration) plus cell therapy with defined molecular mechanism (IL-10/IL-10R axis), human and mouse MASH models","pmids":["40929246"],"is_preprint":false},{"year":2016,"finding":"Tim-4 inhibits NO production and iNOS expression in LPS- or IFN-γ-stimulated macrophages by suppressing NF-κB p65 phosphorylation (for LPS) and Jak2/Stat1 phosphorylation (for IFN-γ). Conversely, Tim-4 blockade promotes NF-κB and Jak2/Stat1 signaling and enhances NO secretion.","method":"Tim-4 overexpression and antibody blockade; Griess reaction for NO; Western blot for NF-κB/Jak2/Stat1 phosphorylation; NF-κB inhibitor rescue","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain- and loss-of-function with signaling pathway readouts, single lab","pmids":["25905790"],"is_preprint":false},{"year":2011,"finding":"Tim-4 inhibits naive T cell activation and Th17 differentiation via a Tim-1-independent receptor; both the IgV domain and the mucin domain of Tim-4 are required for these inhibitory effects, mediated at least in part through inhibition of ERK signaling.","method":"Tim-4 IgV-only and mucin-only fusion protein domain constructs; ERK phosphorylation assays; Th17 polarization assays; proliferation and cytokine assays","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — domain-dissection experiments with signaling readouts, single lab","pmids":["21463297"],"is_preprint":false},{"year":2004,"finding":"SMUCKLER/TIM4 expression in the spleen is downregulated by LTα or LTβ deficiency (identified by expression profiling of knockout spleens). In situ hybridization showed expression in stromal cells predominantly in the marginal zone. Unlike TIM1 and TIM3, TIM4 lacks a tyrosine phosphorylation motif in its intracellular domain and is not expressed by bone marrow-derived cells.","method":"Gene expression profiling of LTα-/- and LTβ-/- mice; in situ hybridization; expression cloning/structural analysis","journal":"European journal of immunology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — expression profiling and in situ hybridization; structural domain observation without functional validation","pmids":["14768054"],"is_preprint":false},{"year":2016,"finding":"TIM-4 interacts with TIM-3 on the surface of polarized Th1 cells, forming a TIM3-TIM4 complex that induces Th1 cell apoptosis by increasing p300 phosphorylation, which upregulates Fas ligand expression and triggers apoptosis.","method":"Detection of TIM3-TIM4 surface complex by flow cytometry; p300 phosphorylation assay; FasL ChIP, RT-PCR, and Western blot; Th1 cell apoptosis flow cytometry","journal":"Immunologic research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, co-complex detection on cell surface with indirect signaling readouts, limited mechanistic controls","pmids":["26403707"],"is_preprint":false}],"current_model":"TIMD4/TIM4 is a type I transmembrane PS-receptor expressed predominantly on macrophages and dendritic cells that functions primarily as a phosphatidylserine (PS) recognition molecule: it binds PS via a Ca2+-coordinated pocket in its IgV domain (plus secondary ionic sites conferring PS-density sensitivity), tethers apoptotic cells to phagocytes, and cooperates with MERTK (through a direct IgV–fibronectin III domain interaction) to drive a two-step efferocytosis—Tim4-dependent binding followed by MERTK-mediated internalization via MEK/ERK, AKT, FAK, and STAT6 signaling; TIM4 also recruits β1 integrins as co-receptors activating Src-kinases, FAK, PI3K, and Rho-GTPases for actin remodeling, while its cytoplasmic tail is dispensable for engulfment; beyond apoptotic cell clearance, TIM4 serves as the endogenous ligand for TIM-1 on T cells (costimulating T cell proliferation via LAT/Akt/ERK phosphorylation), modulates macrophage cholesterol homeostasis through SREBP2 and post-prandial HDL transport, inhibits NLRP3 inflammasome through LKB1/AMPKα-mediated autophagy, and promotes cross-presentation by delaying phagosomal acidification through F-actin nucleation."},"narrative":{"mechanistic_narrative":"TIMD4 (TIM4) is a type I transmembrane phosphatidylserine (PS) recognition receptor on resident macrophages and dendritic cells that tethers apoptotic cells to phagocytes and orchestrates their clearance (efferocytosis) [PMID:17960135, PMID:18082433, PMID:20421466]. PS binding occurs through a single Ca2+-coordinated pocket in the IgV domain supplemented by weaker ionic sites that make TIM4 sensitive to PS surface density, allowing it to discriminate high-PS apoptotic cells from intermediate-PS activated T cells [PMID:18082433, PMID:24706780]. TIM4 functions as a tether rather than a signaling receptor: its cytoplasmic tail is dispensable and can be replaced by a GPI anchor without loss of engulfment, and uptake instead requires partner receptors and an intact cytoskeleton [PMID:19217291]. Productive internalization depends on cooperation with the TAM-family receptor MERTK, which docks onto TIM4 via a direct IgV–fibronectin type-III domain contact in a two-step mechanism—TIM4-dependent capture followed by MERTK-driven phosphorylation and engulfment through MEK/ERK, AKT, FAK, and STAT6 [PMID:24515440, PMID:30846565, PMID:32640697], and TIM4 also recruits β1 integrins to activate Src-family kinases, FAK, PI3K, and Rho-GTPases for actin remodeling [PMID:24623723]. Loss of TIM4 selectively impairs apoptotic-cell binding by resident peritoneal macrophages and, in combination with MFG-E8 deficiency, drives autoantibody production, linking defective efferocytosis to autoimmunity [PMID:20421466, PMID:22723547]. Beyond corpse clearance, TIM4 is the endogenous ligand for TIM-1 on T cells and costimulates their proliferation through LAT/Akt/ERK signaling [PMID:15793576, PMID:18354194], shapes anti-tumor immunity by sequestering PS-exposing CD8+ T cells and by enabling cross-presentation through F-actin-dependent delay of phagosomal acidification [PMID:34115989, PMID:38607919], and reprograms efferocytic macrophages toward an IL-10-secreting, anti-fibrotic state that restrains hepatic stellate cell activation in MASH [PMID:40929246]. TIM4 additionally restrains inflammation through LKB1/AMPKα-mediated autophagic suppression of the NLRP3 inflammasome [PMID:31263038] and influences macrophage cholesterol homeostasis via the Insig1–SCAP–SREBP2 axis [PMID:36450259].","teleology":[{"year":2005,"claim":"Established the first functional partner for TIM4 by identifying it as the endogenous TIM-1 ligand, framing TIM4 as a regulator of T cell proliferation before its efferocytosis role was known.","evidence":"Ig-fusion protein binding and T cell costimulation assays with in vivo administration","pmids":["15793576"],"confidence":"High","gaps":["Did not define the molecular basis of TIM4–TIM-1 binding","Endogenous expression context of the interaction not resolved"]},{"year":2007,"claim":"Answered what TIM4 recognizes on dying cells, defining it as a PS receptor whose IgV domain directly binds PS to mediate engulfment, with blockade causing autoantibodies in vivo.","evidence":"Expression cloning, fibroblast gain-of-function engulfment, antibody blockade in vitro and in vivo; phospholipid binding plus PS-pocket mutagenesis","pmids":["17960135","18082433"],"confidence":"High","gaps":["Did not establish how PS binding couples to internalization","Co-receptor requirements unaddressed"]},{"year":2009,"claim":"Resolved whether TIM4 signals directly, showing it acts purely as a PS tether—cytoplasmic tail and transmembrane domain dispensable—implying obligate partner receptors for uptake.","evidence":"Cytoplasmic-tail deletion, GPI-anchor replacement, siRNA/knockout of canonical engulfment pathways, cytoskeleton disruption","pmids":["19217291"],"confidence":"High","gaps":["Identity of the downstream signaling co-receptor not yet defined","Mechanism linking tethering to cytoskeletal engagement unknown"]},{"year":2010,"claim":"Defined the physiological cellular role through genetic loss-of-function, showing TIM4 is selectively required for apoptotic (not necrotic or opsonized) cell clearance by resident peritoneal macrophages.","evidence":"Tim4-/- mice; in vitro and in vivo phagocytosis assays; imaging of receptor capping","pmids":["20421466"],"confidence":"High","gaps":["Did not identify the partner receptor mediating engulfment","Cell-type specificity of requirement only partly explored"]},{"year":2014,"claim":"Identified the missing engulfment partner, establishing a two-step model in which TIM4 captures apoptotic cells and MERTK then drives internalization, and defined integrin/Src/FAK/Rho-GTPase signaling for actin remodeling.","evidence":"Tim4-null and MerTK-null macrophages, Ba/F3 reconstitution, phosphorylation assays; single-particle imaging of TIM4/β1 integrin association with signaling knockdowns","pmids":["24515440","24623723"],"confidence":"High","gaps":["Physical basis of TIM4–MERTK association not yet mapped","Relative contributions of integrin vs MERTK routes unresolved"]},{"year":2014,"claim":"Provided the structural logic of PS recognition, defining one Ca2+ pocket plus weak ionic sites that make TIM4 uniquely PS-density-sensitive, enabling discrimination of apoptotic cells from activated T cells.","evidence":"Interfacial X-ray scattering, molecular dynamics, PS-density binding assays","pmids":["24706780"],"confidence":"High","gaps":["Density sensitivity not directly tied to in vivo target selection","Structure of the full receptor in membrane context not determined"]},{"year":2014,"claim":"Extended TIM4 beyond clearance into immune regulation and tissue-specific phagosome control, linking it to AMPKα-driven autophagic degradation of tumor antigen and to phagosome stabilization during neuronal corpse removal.","evidence":"Co-IP of TIM-4/AMPKα with autophagy/antigen-presentation assays; zebrafish live imaging with genetic loss-of-function","pmids":["24315994","24898390"],"confidence":"Medium","gaps":["AMPKα interaction shown by single-lab Co-IP","Phagosome-stabilization mechanism not molecularly defined"]},{"year":2019,"claim":"Refined the cooperative model by showing TIM4 enhancement of TAM-receptor efferocytosis is macrophage-population-specific and that TIM4 and MERTK signal through partly distinct downstream pathways.","evidence":"Single-TAM-receptor cell lines, Tim4-null macrophages across multiple primary populations, pathway inhibitors and MERTK domain mutagenesis in reconstituted Ba/F3 cells","pmids":["28768810","30846565"],"confidence":"High","gaps":["Determinants of population specificity not identified","Direct vs indirect pathway contributions incompletely separated"]},{"year":2020,"claim":"Mapped the physical TIM4–MERTK interaction to the TIM4 IgV and MERTK fibronectin III domains, providing the molecular basis for cooperative efferocytosis.","evidence":"Immunoprecipitation, proximity ligation, and domain-mapping competition with soluble GST-MertkFnIII","pmids":["32640697"],"confidence":"Medium","gaps":["Single-lab interaction mapping","Stoichiometry and structural detail of the complex unknown"]},{"year":2021,"claim":"Connected TIM4 PS recognition to anti-tumor immune suppression, showing cavity macrophages sequester PS-exposing CD8+ T cells, and that TIM4 on cDC1 drives tumor-antigen cross-presentation.","evidence":"In vivo TIM4 blockade in immunotherapy models; conditional cDC1 TIM4 deletion with cross-presentation and tumor-progression readouts","pmids":["34115989","33854047"],"confidence":"Medium","gaps":["Single-lab in vivo models","Direct versus indirect effects on T cell fate not fully separated"]},{"year":2024,"claim":"Established a mechanism for TIM4-driven cross-presentation, showing TIM4 engulfment nucleates F-actin around phagosomes to delay acidification and preserve antigen for CD8+ T cell priming.","evidence":"Live imaging of phagosome maturation, F-actin/v-ATPase recruitment assays, cross-presentation assays, in vivo TIM4-knockout tumor model","pmids":["38607919"],"confidence":"Medium","gaps":["Molecular trigger linking TIM4 to F-actin nucleation undefined","Single-lab study"]},{"year":2025,"claim":"Defined a therapeutically relevant TIM4 axis in liver disease, showing TIM4-mediated efferocytosis reprograms Kupffer cells to secrete IL-10 that suppresses profibrotic hepatic stellate cells in MASH.","evidence":"Kupffer-cell Timd4 conditional knockout and restoration, TIM4+ cell therapy, neutralizing antibodies, macrophage-HSC co-culture, IL-10/IL-10R assays in mouse and human MASH","pmids":["40929246"],"confidence":"High","gaps":["Upstream control of efferocytosis-to-IL-10 reprogramming unresolved","Human translation of cell therapy not established"]},{"year":null,"claim":"How TIM4's diverse non-PS ligand recognition (bacterial particles, viral glycoproteins, carbon nanotubes, microplastics) and its many reported intracellular partners (LKB1/AMPKα, SCAP/Insig1, ANXA2, αvβ3 integrin) are mechanistically integrated with its tether-only signaling architecture remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Most non-canonical interactions rest on single-lab Co-IP","How a tail-dispensable receptor couples to intracellular signaling partners is unexplained","Relative physiological weight of each pathway unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,1,4,23]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[2,8]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,23]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[12,25]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,13,26]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,5,9]}],"complexes":[],"partners":["MERTK","HAVCR1","ITGB1","ITGAV","PRKAA1","STK11","ANXA2","HAVCR2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96H15","full_name":"T-cell immunoglobulin and mucin domain-containing protein 4","aliases":["T-cell immunoglobulin mucin receptor 4","TIM-4","T-cell membrane protein 4"],"length_aa":378,"mass_kda":41.6,"function":"Phosphatidylserine receptor that plays different role in immune response including phagocytosis of apoptotic cells and T-cell regulation. Controls T-cell activation in a bimodal fashion, decreasing the activation of naive T-cells by inducing cell cycle arrest, while increasing proliferation of activated T-cells by activating AKT1 and ERK1/2 phosphorylations and subsequent signaling pathways (By similarity). Also plays a role in efferocytosis which is the process by which apoptotic cells are removed by phagocytic cells (PubMed:32703939, PubMed:34067457). Mechanistically, promotes the engulfment of apoptotic cells or exogenous particles by securing them to phagocytes through direct binding to phosphatidylserine present on apoptotic cells, while other engulfment receptors such as MERTK efficiently recognize apoptotic cells and mediate their ingestion (PubMed:32640697). Additionally, promotes autophagy process by suppressing NLRP3 inflammasome activity via activation of LKB1/PRKAA1 pathway in a phosphatidylserine-dependent mechanism (By similarity) (Microbial infection) Plays a positive role in exosome-mediated trafficking of HIV-1 virus and its entry into immune cells","subcellular_location":"Cell membrane; Secreted, extracellular exosome","url":"https://www.uniprot.org/uniprotkb/Q96H15/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TIMD4","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TIMD4","total_profiled":1310},"omim":[{"mim_id":"610705","title":"CD300 ANTIGEN-LIKE FAMILY, MEMBER B; CD300LB","url":"https://www.omim.org/entry/610705"},{"mim_id":"610096","title":"T-CELL IMMUNOGLOBULIN AND MUCIN DOMAINS-CONTAINING PROTEIN 4; TIMD4","url":"https://www.omim.org/entry/610096"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid 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inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/24204099","citation_count":12,"is_preprint":false},{"pmid":"24612609","id":"PMC_24612609","title":"TIM4 Regulates the Anti-Islet Th2 Alloimmune Response.","date":"2014","source":"Cell transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/24612609","citation_count":11,"is_preprint":false},{"pmid":"27662666","id":"PMC_27662666","title":"TIM-4 is expressed on invariant NKT cells but dispensable for their development and function.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27662666","citation_count":11,"is_preprint":false},{"pmid":"22558597","id":"PMC_22558597","title":"Role of TIM-4 in innate or adaptive immune response.","date":"2011","source":"North American journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/22558597","citation_count":11,"is_preprint":false},{"pmid":"40289811","id":"PMC_40289811","title":"Splenic CD169+Tim4+ Marginal Metallophilic Macrophages Are Essential for Wound Healing After Myocardial Infarction.","date":"2025","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/40289811","citation_count":10,"is_preprint":false},{"pmid":"40929246","id":"PMC_40929246","title":"Impaired TIM4-mediated efferocytosis by liver macrophages contributes to fibrosis in metabolic dysfunction-associated steatohepatitis.","date":"2025","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40929246","citation_count":10,"is_preprint":false},{"pmid":"29189411","id":"PMC_29189411","title":"Diverse roles of TIM4 in immune activation: implications for alloimmunity.","date":"2018","source":"Current opinion in organ transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/29189411","citation_count":10,"is_preprint":false},{"pmid":"25470136","id":"PMC_25470136","title":"Novel insights into Tim-4 function in autoimmune diseases.","date":"2014","source":"Autoimmunity","url":"https://pubmed.ncbi.nlm.nih.gov/25470136","citation_count":10,"is_preprint":false},{"pmid":"25044827","id":"PMC_25044827","title":"Flagellin modulates TIM4 expression in mast cells.","date":"2014","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/25044827","citation_count":10,"is_preprint":false},{"pmid":"34188113","id":"PMC_34188113","title":"Identification of small compounds regulating the secretion of extracellular vesicles via a TIM4-affinity ELISA.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34188113","citation_count":10,"is_preprint":false},{"pmid":"38011622","id":"PMC_38011622","title":"High Throughput and Noninvasive Exosomal PD-L1 Detection for Accurate Immunotherapy Response Prediction via Tim4-Functionalized Magnetic Core-Shell Metal-Organic Frameworks.","date":"2023","source":"Analytical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38011622","citation_count":10,"is_preprint":false},{"pmid":"25899833","id":"PMC_25899833","title":"TIM-1 rs41297579 G>A (-1454) and TIM-4 rs7700944 gene polymorphisms as possible risk factor for rheumatoid arthritis: relation to activity and severity.","date":"2015","source":"International journal of immunogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/25899833","citation_count":10,"is_preprint":false},{"pmid":"33465392","id":"PMC_33465392","title":"Tim-4 expressing monocytes as a novel indicator to assess disease activity and severity of ulcerative colitis.","date":"2021","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33465392","citation_count":10,"is_preprint":false},{"pmid":"29233585","id":"PMC_29233585","title":"Tim-4 expression increases in ischemic stroke patients and is associated with poor outcome.","date":"2017","source":"Journal of 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Basic to translational science","url":"https://pubmed.ncbi.nlm.nih.gov/39906591","citation_count":7,"is_preprint":false},{"pmid":"31337960","id":"PMC_31337960","title":"TIMD4 rs6882076 SNP Is Associated with Decreased Levels of Triglycerides and the Risk of Coronary Heart Disease and Ischemic Stroke.","date":"2019","source":"International journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31337960","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50307,"output_tokens":9108,"usd":0.14377,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19307,"output_tokens":4444,"usd":0.103817,"stage2_stop_reason":"end_turn"},"total_usd":0.247587,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"Tim4 (TIMD4) was identified as a phosphatidylserine (PS) receptor: its immunoglobulin domain directly binds PS on apoptotic cells and on expelled erythroid nuclei, mediating their phagocytic engulfment. Expression in fibroblasts conferred engulfment activity, and anti-Tim4 monoclonal antibody blocked engulfment in vitro and in vivo, causing autoantibody development in mice.\",\n      \"method\": \"Expression cloning; monoclonal antibody inhibition assay; fibroblast gain-of-function engulfment assay; in vivo antibody injection\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — expression cloning with functional rescue, in vitro binding assay, in vivo blockade with defined phenotype, independently replicated\",\n      \"pmids\": [\"17960135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TIM-4 (and TIM-1) specifically bind PS on apoptotic cells (but no other phospholipid tested) via a conserved cavity in the IgV domain. Point mutations abolishing this cavity eliminated PS binding and phagocytosis. TIM-4-expressing peritoneal macrophages and transfected cells efficiently phagocytosed apoptotic cells, blocked by anti-TIM-4 mAbs mapping to the binding cavity.\",\n      \"method\": \"Phospholipid binding assays; site-directed mutagenesis of PS-binding cavity; phagocytosis assay with transfected cells; mAb epitope mapping\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis with functional readout (binding + phagocytosis), independent replication of PS-receptor identification\",\n      \"pmids\": [\"18082433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TIM-4 (expressed on antigen-presenting cells) is the endogenous ligand for TIM-1 (expressed on T cells). TIM-4-Ig fusion protein costimulated T cell proliferation via CD3/CD28; in vivo administration of soluble TIM-1-Ig or TIM-4-Ig caused T cell hyperproliferation, establishing TIM-1/TIM-4 interaction as a regulator of T cell proliferation.\",\n      \"method\": \"Soluble Ig-fusion protein binding assays; in vitro T cell proliferation costimulation assay; in vivo administration of fusion proteins\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal ligand-receptor identification with functional in vitro and in vivo validation, widely cited and replicated\",\n      \"pmids\": [\"15793576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TIM-4 functions as a PS tethering receptor without direct intracellular signaling: a TIM-4 mutant lacking its entire cytoplasmic tail still promoted apoptotic cell engulfment comparably to wild-type, and replacement of the transmembrane domain with a GPI anchor also supported engulfment. TIM-4-mediated uptake was independent of the ELMO1/Dock180/Rac and GULP signaling pathways, yet required an intact cytoskeleton.\",\n      \"method\": \"Dominant-negative mutants; siRNA knockdown of signaling components; knockout cell lines; cytoplasmic-tail deletion and GPI-anchor replacement constructs; cytoskeleton disruption drugs\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal loss-of-function approaches with domain-replacement mutagenesis in one rigorous study\",\n      \"pmids\": [\"19217291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Tim4 and MerTK cooperate in a two-step mechanism for efferocytosis by resident peritoneal macrophages: Tim4 acts as a PS-binding tether that captures apoptotic cells, and this Tim4-dependent binding is required for subsequent MerTK-mediated tyrosine phosphorylation and internalization. Tim4-null macrophages had reduced binding and engulfment; MerTK-null macrophages bound but failed to engulf; Tim4 + MerTK co-expression in Ba/F3 cells reconstituted full engulfment activity.\",\n      \"method\": \"Neutralizing antibody inhibition; Tim4-null and MerTK-null macrophages; Ba/F3 reconstitution with Tim4 and/or MerTK; tyrosine phosphorylation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockouts combined with reconstitution and phosphorylation assays, two complementary cell systems\",\n      \"pmids\": [\"24515440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TIM4-driven phagocytosis requires integrin co-receptor activation: TIM4 associates with β1 integrins upon receptor clustering (single-particle detection), and phagocytosis depends on Src-family kinases, focal adhesion kinase (FAK), PI(3,4,5)P3 accumulation, Vav3 recruitment, and synergistic action of RhoA, Rac1, and Rac2. TIM4 operates independently of lactadherin as a bridging molecule.\",\n      \"method\": \"TIM4-/- bone marrow-derived macrophages vs. wild-type; heterologous expression in AD293 cells; gene silencing/ablation of signaling intermediates; single-particle detection of TIM4/β1 integrin association\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two complementary genetic systems, multiple signaling inhibitors and knockouts, single-particle imaging, single lab but orthogonal methods\",\n      \"pmids\": [\"24623723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TIM-4 on tumor-associated myeloid cells directly interacts with AMPKα1 and activates autophagy-mediated degradation of ingested tumor cells, leading to reduced antigen presentation and impaired CTL responses. Blockade of the TIM-4–AMPKα1–autophagy pathway enhanced antitumor CTL responses.\",\n      \"method\": \"Co-immunoprecipitation of TIM-4 and AMPKα1; autophagy assays; antigen presentation assays; tumor models with TIM-4 blockade\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP interaction and functional autophagy/antigen presentation assays in a single lab study\",\n      \"pmids\": [\"24315994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Using interfacial X-ray scattering, molecular dynamics simulations, and membrane binding assays, Tim4 was shown to possess one Ca2+-coordinated primary PS binding pocket (IgV domain) plus four weaker ionic interaction sites, making Tim4 sensitive to PS surface density. This organization allows differential recognition of apoptotic cells (high PS) versus activated T cells (intermediate PS), unlike TIM-1 and TIM-3 which are less PS-density-sensitive.\",\n      \"method\": \"Interfacial X-ray scattering; molecular dynamics simulation; PS membrane-binding assays with varying PS density\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural/biophysical methods (X-ray scattering + MD simulation) combined with functional binding assays in a single rigorous study\",\n      \"pmids\": [\"24706780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TIM-4 expressed on APCs specifically phosphorylates TIM-1 on T cells and induces signaling through LAT, Akt, and ERK1/2, promoting T cell expansion by enhancing cell division and reducing apoptosis.\",\n      \"method\": \"Anti-TIM-4 monoclonal antibodies; phosphorylation assays for TIM-1, LAT, Akt, ERK1/2; T cell proliferation and apoptosis assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — signaling assays with defined readouts in a single lab, functional T-cell expansion confirmed\",\n      \"pmids\": [\"18354194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tim4 alone does not support efferocytosis but enhances TAM-receptor (MERTK/Tyro3/Axl)-dependent efferocytosis in specific macrophage populations. ProS/Gas6 bridging molecules bind PtdSer and TAM receptors; Gas6 binds Axl strongly but ProS does not. Tim4 enhancement of TAM-mediated efferocytosis is population-specific: required by resident peritoneal macrophages, Kupffer cells, and CD169+ skin macrophages, but not by thioglycollate-elicited macrophages or primary microglia.\",\n      \"method\": \"NIH3T3-based cell lines expressing single TAM receptors; Tim4-null macrophages; multiple primary macrophage populations; recombinant ProS/Gas6 with Kd measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic systems (null cells, reconstitution), multiple primary macrophage populations, quantitative binding assays\",\n      \"pmids\": [\"28768810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TIM4 and MERTK signal through distinct pathways: efferocytosis by resident peritoneal macrophages requires MEK/ERK, AKT, FAK, and STAT6 (but not NF-κB or STAT5), while MERTK-mediated proliferation in response to apoptotic cells additionally requires NF-κB and STAT5. The juxtamembrane and C-terminal regions of MERTK have redundant roles in efferocytosis. TIM4 and MERTK together enable apoptotic-cell-induced Ba/F3 cell proliferation in a PtdSer-dependent manner.\",\n      \"method\": \"Pathway inhibitors; MERTK domain mutagenesis; reconstituted Ba/F3 cell system with MERTK + TIM4; phosphorylation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reconstituted cell system with domain mutagenesis and pharmacological pathway dissection, single lab\",\n      \"pmids\": [\"30846565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tim-4 physically associates with Mertk via an interaction between the IgV domain of Tim-4 and the fibronectin type-III domain of Mertk. This interaction is required for Mertk to enhance Tim-4-mediated efferocytosis, as a soluble GST-MertkFnIII fragment that disrupts the interaction abolishes the enhancement.\",\n      \"method\": \"Immunoprecipitation; immunofluorescence and proximity ligation assay; domain-mapping with soluble GST-MertkFnIII competitor\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal domain-level interaction mapped by pulldown and PLA with functional competition assay, single lab\",\n      \"pmids\": [\"32640697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In zebrafish microglia, TIM-4 is required specifically for phagosome stabilization during engulfment of dying neurons, while BAI1 controls phagosome formation and cargo transport. Loss of TIM-4 alone allows recognition of apoptotic targets but causes distinct clearance defects; combined BAI1 and TIM-4 activity is required for complete neuronal corpse removal.\",\n      \"method\": \"Live imaging of zebrafish embryo brain; genetic loss-of-function (TIM-4 and BAI1 morpholino/mutant); quantification of phagocytic stages\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live single-cell imaging in intact organism with genetic knockdown, defined cellular phenotypes, single lab\",\n      \"pmids\": [\"24898390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tim-4+ cavity-resident macrophages sequester viable cytotoxic CD8+ T cells away from tumor targets and suppress their proliferation through PS recognition, since anti-tumor CD8+ T cells upregulate PS exposure. Tim-4 blockade abrogates this sequestration and restores anti-tumor CD8+ T cell efficacy in mouse models.\",\n      \"method\": \"Flow cytometry of pleural effusions/ascites; in vivo Tim-4 blockade in anti-PD-1 and adoptive T cell therapy mouse models; PS exposure measurement on CD8+ T cells\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic in vivo blockade experiments with defined cellular readouts, single lab with multiple in vivo models\",\n      \"pmids\": [\"34115989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Residues within the PS-binding pocket of the TIM-4 IgV domain (murine and human) are required for Ebola virus (EBOV) pseudovirion binding and entry. Mutagenesis identified 8 mTIM-4 and 14 hTIM-4 IgV domain residues critical for virion binding and internalization, with TIM-4-specific residues beyond those shared with TIM-1.\",\n      \"method\": \"Site-directed mutagenesis of TIM-4 IgV domain residues; VSV pseudovirion bearing EBOV glycoprotein entry assays; virus binding assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis screen with functional entry readout, single lab\",\n      \"pmids\": [\"27122575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tim4 recognizes multi-walled carbon nanotubes (MWCNTs) through aromatic-aromatic interactions between aromatic residues in the extracellular IgV domain and the carbon crystal surface. CRISPR-Cas9 deletion of Tim4 (but not Tim1) in peritoneal macrophages impaired MWCNT recognition and phagocytosis, and reduced granuloma formation in vivo. Docking simulations confirmed spatiotemporally stable interfaces.\",\n      \"method\": \"Targeted receptor screening; molecular docking simulation; CRISPR-Cas9 Tim4 deletion; phagocytosis assays; in vivo mesothelial MWCNT exposure model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR genetic deletion with in vitro and in vivo phagocytosis readouts plus computational docking, single lab\",\n      \"pmids\": [\"33567275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Tim4 binds polystyrene (PS) microparticles through extracellular aromatic cluster interactions (aromatic-aromatic), the same cluster involved in MWCNT recognition. Genetic deletion of Tim4 reduced macrophage engulfment of PS microplastics. PS microparticles competitively blocked Tim4-mediated efferocytosis of apoptotic cells, but PS microparticle engulfment did not activate NLRP3/IL-1β unlike MWCNTs.\",\n      \"method\": \"Tim4 knockout macrophages; competitive efferocytosis assay; cytokine secretion assays; comparison with MWCNT responses\",\n      \"journal\": \"The Science of the total environment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic deletion with multiple functional assays, single lab\",\n      \"pmids\": [\"36871719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Tim-4 in macrophages inhibits NLRP3 inflammasome activation via the LKB1/AMPKα pathway: Tim-4 physically interacts with LKB1 and AMPKα (shown by co-IP), promoting AMPKα phosphorylation and AMPKα-mediated autophagy-dependent degradation of NLRP3 components, reducing IL-1β and IL-18 release. The PS-binding IgV domain of Tim-4 is required for this LKB1/AMPKα interaction.\",\n      \"method\": \"Co-immunoprecipitation of Tim-4, LKB1, and AMPKα; Tim-4 knockout mice; NLRP3 inflammasome activation assays; autophagy assays; IgV domain mutants\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP interaction with genetic knockout and domain mutagenesis, multiple functional readouts, single lab\",\n      \"pmids\": [\"31263038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tim-4 disrupts the Insig1-SCAP interaction in macrophages, promoting SCAP-SREBP2 complex translocation to the Golgi apparatus and upregulation of cholesterol biosynthesis, which in turn limits type I IFN signaling. Tim-4 deficiency boosts IFN signaling and decreases viral load.\",\n      \"method\": \"Tim-4 knockout mice; co-immunoprecipitation of Insig1 and SCAP; SREBP2 activation assays; IFN pathway reporter assays; viral infection models\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — genetic knockout with Co-IP and defined molecular pathway readouts, single lab\",\n      \"pmids\": [\"36450259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tim-4 functions as a scavenger receptor for phagocytosis of exogenous bacterial particles (E. coli and S. aureus bioparticles) via a phosphatidylserine-independent mechanism. The IgV domain and mucin domain of Tim-4 (but not the cytoplasmic tail) are required for this scavenging activity. A PS-binding-deficient Tim-4 mutant (Tim-4AAA) still promoted bacterial particle phagocytosis. Tim-4 overexpression enhanced LPS binding.\",\n      \"method\": \"Tim-4 overexpression and knockout cell lines; domain deletion mutants; PS-binding-deficient mutant (Tim-4AAA); Anxa5 competition assay; LPS binding assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — domain mutagenesis with gain/loss-of-function, multiple particle types, single lab\",\n      \"pmids\": [\"32703939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TIM-4 promotes non-small-cell lung cancer cell growth and proliferation through its RGD motif by interacting with αvβ3 integrin; RGD motif mutation abolishes TIM-4-induced proliferation in vitro and in xenograft models. Co-IP confirmed TIM-4–αvβ3 integrin interaction.\",\n      \"method\": \"Co-immunoprecipitation; RGD motif site-directed mutagenesis; cell proliferation assays (CCK-8, EdU); xenograft tumor model\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mutagenesis with Co-IP and in vivo xenograft, single lab\",\n      \"pmids\": [\"26512878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"N-glycosylation of TIM-4 at Asn291 stabilizes the protein; removal of this glycosylation increases TIM-4 susceptibility to ER-localized ubiquitin ligase-mediated ERAD degradation, decreasing TIM-4 surface expression and suppressing TIM-4-mediated metastasis in NSCLC cells.\",\n      \"method\": \"Site-directed mutagenesis of N-glycosylation site (Asn291); protein stability/degradation assays; ERAD pathway analysis; cell migration/invasion assays\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mutagenesis identifying specific PTM site with degradation and functional migration assays, single lab\",\n      \"pmids\": [\"35433445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TIM-4 promotes mitochondrial fusion and oxidative phosphorylation in lung cancer cells via the ANXA2/PI3K/AKT/OPA1 axis: TIM-4 interacts with ANXA2 (co-IP), activating PI3K/AKT signaling to increase L-OPA1 protein expression, promoting mitochondrial fusion and OXPHOS-dependent proliferation. Inhibiting OXPHOS reversed TIM-4-induced proliferation.\",\n      \"method\": \"Co-immunoprecipitation of TIM-4 and ANXA2; PI3K/AKT pathway inhibitors; mitochondrial morphology assays; OPA1 expression analysis; OXPHOS inhibitor rescue experiments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP interaction with pathway inhibitor experiments and defined molecular readouts, single lab\",\n      \"pmids\": [\"36806050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tim-4 deficiency in resident peritoneal macrophages (rPMs) significantly impairs binding and engulfment of apoptotic cells in vitro and in vivo, but does not affect phagocytosis of necrotic cells or opsonized targets. Tim-4 rapidly forms punctate caps upon contact with apoptotic cells. Tim-4 deficiency does not impair marginal zone trapping of apoptotic cells, tingible body macrophage clearance, or germinal center formation, but causes increased peritoneal cellularity and altered macrophage responses to LPS and TNF-α.\",\n      \"method\": \"Tim-4-/- mice; in vitro and in vivo phagocytosis assays; fluorescence microscopy of Tim-4 redistribution; peritoneal cellularity analysis; LPS/TNF-α response assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with in vitro and in vivo phagocytosis assays and multiple cell-type controls, well-replicated findings\",\n      \"pmids\": [\"20421466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tim4 deficiency specifically impairs resident peritoneal macrophage (but not thioglycollate-elicited macrophage) engulfment of apoptotic cells. Double deficiency of Tim4 and MFG-E8 causes age-dependent autoantibody production in female C57BL/6 mice, synergistically disrupting apoptotic cell clearance and immune homeostasis.\",\n      \"method\": \"Tim4-/- and Tim4-/-MFG-E8-/- double-knockout mice; peritoneal and thioglycollate-elicited macrophage engulfment assays; autoantibody measurement; anti-TNFα and pristane treatment\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-knockout epistasis with multiple in vivo immunological readouts, establishes pathway position\",\n      \"pmids\": [\"22723547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TIM4-mediated engulfment by large peritoneal macrophages induces nucleation of F-actin around nascent phagosomes, delaying vacuolar ATPase recruitment, phagosomal acidification, and cargo degradation, thereby prolonging antigen integrity and facilitating cross-presentation of tumor-associated antigens to CD8+ T cells. In vivo, TIM4 deletion blunts early anti-tumor CD8+ T cell induction and accelerates peritoneal tumor progression.\",\n      \"method\": \"Live imaging of phagosome formation; F-actin/v-ATPase recruitment assays; cross-presentation assays; TIM4-knockout in vivo ovarian tumor model; PS-coated artificial targets\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with defined phagosomal readouts plus in vivo genetic deletion, single lab\",\n      \"pmids\": [\"38607919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TIM4 on lung-resident cDC1 dendritic cells mediates capture and phagocytosis of cell-associated tumor antigens. Loss of TIM4 by conditional cDC1 deletion or TIM4 blockade impairs activation of tumor-specific CD8+ T cells and promotes lung tumor progression.\",\n      \"method\": \"Conditional TIM4 deletion in cDC1; TIM4 receptor blockade; cross-presentation and CD8+ T cell activation assays; lung tumor progression in mice\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional genetic deletion with defined immunological and tumor progression phenotypes, single lab\",\n      \"pmids\": [\"33854047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TIM-4 inhibits naive T cell activation through a ligand other than TIM-1 (TIM-1-independent pathway), while it promotes expansion of pre-activated T cells. In vivo anti-TIM-4 antibody blockade suppressed T cell-mediated inflammatory responses despite enhanced antigen-specific T cell generation.\",\n      \"method\": \"TIM-4-Ig fusion protein stimulation of naive vs. pre-activated T cells; in vivo anti-TIM-4 blockade; adoptive transfer of primed T cells\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro and in vivo blockade experiments with defined T cell activation readouts, single lab\",\n      \"pmids\": [\"18367551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Blocking the PS receptor Tim4 in adipose tissue macrophages inhibits lysosomal activation and the release of post-prandial high-density lipoprotein cholesterol following a high-fat meal. This implicates Tim4-dependent lysosomal function in resident adipose tissue macrophage regulation of cholesterol transport.\",\n      \"method\": \"Anti-Tim4 antibody blockade; chloroquine (lysosomal inhibitor) comparison; single-cell RNA sequencing; protected bone marrow chimeras; clodronate cell depletion; post-prandial lipid measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — pharmacological and antibody blockade with scRNA-seq and chimera experiments, single lab with orthogonal approaches\",\n      \"pmids\": [\"34290249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Efferocytosis by liver macrophages via TIM4 is impaired in MASH, driving fibrosis. TIM4 deletion or neutralization in Kupffer cells reduces apoptotic hepatocyte clearance and accelerates profibrotic hepatic stellate cell (HSC) activation. Genetic restoration of macrophage Timd4 or cell therapy with TIM4+ macrophages enhances clearance and reduces fibrosis. Mechanistically, TIM4-mediated efferocytosis reprograms macrophages to secrete IL-10, which activates the IL-10 receptor on HSCs to suppress their profibrotic activation.\",\n      \"method\": \"Timd4 conditional knockout in Kupffer cells; Timd4 genetic restoration; TIM4+ cell therapy; anti-TIM4 neutralizing antibodies; ex vivo macrophage-HSC co-culture; IL-10/IL-10R pathway assays\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic approaches (knockout, restoration) plus cell therapy with defined molecular mechanism (IL-10/IL-10R axis), human and mouse MASH models\",\n      \"pmids\": [\"40929246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tim-4 inhibits NO production and iNOS expression in LPS- or IFN-γ-stimulated macrophages by suppressing NF-κB p65 phosphorylation (for LPS) and Jak2/Stat1 phosphorylation (for IFN-γ). Conversely, Tim-4 blockade promotes NF-κB and Jak2/Stat1 signaling and enhances NO secretion.\",\n      \"method\": \"Tim-4 overexpression and antibody blockade; Griess reaction for NO; Western blot for NF-κB/Jak2/Stat1 phosphorylation; NF-κB inhibitor rescue\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain- and loss-of-function with signaling pathway readouts, single lab\",\n      \"pmids\": [\"25905790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Tim-4 inhibits naive T cell activation and Th17 differentiation via a Tim-1-independent receptor; both the IgV domain and the mucin domain of Tim-4 are required for these inhibitory effects, mediated at least in part through inhibition of ERK signaling.\",\n      \"method\": \"Tim-4 IgV-only and mucin-only fusion protein domain constructs; ERK phosphorylation assays; Th17 polarization assays; proliferation and cytokine assays\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — domain-dissection experiments with signaling readouts, single lab\",\n      \"pmids\": [\"21463297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SMUCKLER/TIM4 expression in the spleen is downregulated by LTα or LTβ deficiency (identified by expression profiling of knockout spleens). In situ hybridization showed expression in stromal cells predominantly in the marginal zone. Unlike TIM1 and TIM3, TIM4 lacks a tyrosine phosphorylation motif in its intracellular domain and is not expressed by bone marrow-derived cells.\",\n      \"method\": \"Gene expression profiling of LTα-/- and LTβ-/- mice; in situ hybridization; expression cloning/structural analysis\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — expression profiling and in situ hybridization; structural domain observation without functional validation\",\n      \"pmids\": [\"14768054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TIM-4 interacts with TIM-3 on the surface of polarized Th1 cells, forming a TIM3-TIM4 complex that induces Th1 cell apoptosis by increasing p300 phosphorylation, which upregulates Fas ligand expression and triggers apoptosis.\",\n      \"method\": \"Detection of TIM3-TIM4 surface complex by flow cytometry; p300 phosphorylation assay; FasL ChIP, RT-PCR, and Western blot; Th1 cell apoptosis flow cytometry\",\n      \"journal\": \"Immunologic research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, co-complex detection on cell surface with indirect signaling readouts, limited mechanistic controls\",\n      \"pmids\": [\"26403707\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TIMD4/TIM4 is a type I transmembrane PS-receptor expressed predominantly on macrophages and dendritic cells that functions primarily as a phosphatidylserine (PS) recognition molecule: it binds PS via a Ca2+-coordinated pocket in its IgV domain (plus secondary ionic sites conferring PS-density sensitivity), tethers apoptotic cells to phagocytes, and cooperates with MERTK (through a direct IgV–fibronectin III domain interaction) to drive a two-step efferocytosis—Tim4-dependent binding followed by MERTK-mediated internalization via MEK/ERK, AKT, FAK, and STAT6 signaling; TIM4 also recruits β1 integrins as co-receptors activating Src-kinases, FAK, PI3K, and Rho-GTPases for actin remodeling, while its cytoplasmic tail is dispensable for engulfment; beyond apoptotic cell clearance, TIM4 serves as the endogenous ligand for TIM-1 on T cells (costimulating T cell proliferation via LAT/Akt/ERK phosphorylation), modulates macrophage cholesterol homeostasis through SREBP2 and post-prandial HDL transport, inhibits NLRP3 inflammasome through LKB1/AMPKα-mediated autophagy, and promotes cross-presentation by delaying phagosomal acidification through F-actin nucleation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TIMD4 (TIM4) is a type I transmembrane phosphatidylserine (PS) recognition receptor on resident macrophages and dendritic cells that tethers apoptotic cells to phagocytes and orchestrates their clearance (efferocytosis) [#0, #1, #23]. PS binding occurs through a single Ca2+-coordinated pocket in the IgV domain supplemented by weaker ionic sites that make TIM4 sensitive to PS surface density, allowing it to discriminate high-PS apoptotic cells from intermediate-PS activated T cells [#1, #7]. TIM4 functions as a tether rather than a signaling receptor: its cytoplasmic tail is dispensable and can be replaced by a GPI anchor without loss of engulfment, and uptake instead requires partner receptors and an intact cytoskeleton [#3]. Productive internalization depends on cooperation with the TAM-family receptor MERTK, which docks onto TIM4 via a direct IgV–fibronectin type-III domain contact in a two-step mechanism—TIM4-dependent capture followed by MERTK-driven phosphorylation and engulfment through MEK/ERK, AKT, FAK, and STAT6 [#4, #10, #11], and TIM4 also recruits β1 integrins to activate Src-family kinases, FAK, PI3K, and Rho-GTPases for actin remodeling [#5]. Loss of TIM4 selectively impairs apoptotic-cell binding by resident peritoneal macrophages and, in combination with MFG-E8 deficiency, drives autoantibody production, linking defective efferocytosis to autoimmunity [#23, #24]. Beyond corpse clearance, TIM4 is the endogenous ligand for TIM-1 on T cells and costimulates their proliferation through LAT/Akt/ERK signaling [#2, #8], shapes anti-tumor immunity by sequestering PS-exposing CD8+ T cells and by enabling cross-presentation through F-actin-dependent delay of phagosomal acidification [#13, #25], and reprograms efferocytic macrophages toward an IL-10-secreting, anti-fibrotic state that restrains hepatic stellate cell activation in MASH [#29]. TIM4 additionally restrains inflammation through LKB1/AMPKα-mediated autophagic suppression of the NLRP3 inflammasome [#17] and influences macrophage cholesterol homeostasis via the Insig1–SCAP–SREBP2 axis [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established the first functional partner for TIM4 by identifying it as the endogenous TIM-1 ligand, framing TIM4 as a regulator of T cell proliferation before its efferocytosis role was known.\",\n      \"evidence\": \"Ig-fusion protein binding and T cell costimulation assays with in vivo administration\",\n      \"pmids\": [\"15793576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular basis of TIM4–TIM-1 binding\", \"Endogenous expression context of the interaction not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Answered what TIM4 recognizes on dying cells, defining it as a PS receptor whose IgV domain directly binds PS to mediate engulfment, with blockade causing autoantibodies in vivo.\",\n      \"evidence\": \"Expression cloning, fibroblast gain-of-function engulfment, antibody blockade in vitro and in vivo; phospholipid binding plus PS-pocket mutagenesis\",\n      \"pmids\": [\"17960135\", \"18082433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how PS binding couples to internalization\", \"Co-receptor requirements unaddressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved whether TIM4 signals directly, showing it acts purely as a PS tether—cytoplasmic tail and transmembrane domain dispensable—implying obligate partner receptors for uptake.\",\n      \"evidence\": \"Cytoplasmic-tail deletion, GPI-anchor replacement, siRNA/knockout of canonical engulfment pathways, cytoskeleton disruption\",\n      \"pmids\": [\"19217291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the downstream signaling co-receptor not yet defined\", \"Mechanism linking tethering to cytoskeletal engagement unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the physiological cellular role through genetic loss-of-function, showing TIM4 is selectively required for apoptotic (not necrotic or opsonized) cell clearance by resident peritoneal macrophages.\",\n      \"evidence\": \"Tim4-/- mice; in vitro and in vivo phagocytosis assays; imaging of receptor capping\",\n      \"pmids\": [\"20421466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the partner receptor mediating engulfment\", \"Cell-type specificity of requirement only partly explored\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified the missing engulfment partner, establishing a two-step model in which TIM4 captures apoptotic cells and MERTK then drives internalization, and defined integrin/Src/FAK/Rho-GTPase signaling for actin remodeling.\",\n      \"evidence\": \"Tim4-null and MerTK-null macrophages, Ba/F3 reconstitution, phosphorylation assays; single-particle imaging of TIM4/β1 integrin association with signaling knockdowns\",\n      \"pmids\": [\"24515440\", \"24623723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical basis of TIM4–MERTK association not yet mapped\", \"Relative contributions of integrin vs MERTK routes unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided the structural logic of PS recognition, defining one Ca2+ pocket plus weak ionic sites that make TIM4 uniquely PS-density-sensitive, enabling discrimination of apoptotic cells from activated T cells.\",\n      \"evidence\": \"Interfacial X-ray scattering, molecular dynamics, PS-density binding assays\",\n      \"pmids\": [\"24706780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Density sensitivity not directly tied to in vivo target selection\", \"Structure of the full receptor in membrane context not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended TIM4 beyond clearance into immune regulation and tissue-specific phagosome control, linking it to AMPKα-driven autophagic degradation of tumor antigen and to phagosome stabilization during neuronal corpse removal.\",\n      \"evidence\": \"Co-IP of TIM-4/AMPKα with autophagy/antigen-presentation assays; zebrafish live imaging with genetic loss-of-function\",\n      \"pmids\": [\"24315994\", \"24898390\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AMPKα interaction shown by single-lab Co-IP\", \"Phagosome-stabilization mechanism not molecularly defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Refined the cooperative model by showing TIM4 enhancement of TAM-receptor efferocytosis is macrophage-population-specific and that TIM4 and MERTK signal through partly distinct downstream pathways.\",\n      \"evidence\": \"Single-TAM-receptor cell lines, Tim4-null macrophages across multiple primary populations, pathway inhibitors and MERTK domain mutagenesis in reconstituted Ba/F3 cells\",\n      \"pmids\": [\"28768810\", \"30846565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of population specificity not identified\", \"Direct vs indirect pathway contributions incompletely separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapped the physical TIM4–MERTK interaction to the TIM4 IgV and MERTK fibronectin III domains, providing the molecular basis for cooperative efferocytosis.\",\n      \"evidence\": \"Immunoprecipitation, proximity ligation, and domain-mapping competition with soluble GST-MertkFnIII\",\n      \"pmids\": [\"32640697\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction mapping\", \"Stoichiometry and structural detail of the complex unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected TIM4 PS recognition to anti-tumor immune suppression, showing cavity macrophages sequester PS-exposing CD8+ T cells, and that TIM4 on cDC1 drives tumor-antigen cross-presentation.\",\n      \"evidence\": \"In vivo TIM4 blockade in immunotherapy models; conditional cDC1 TIM4 deletion with cross-presentation and tumor-progression readouts\",\n      \"pmids\": [\"34115989\", \"33854047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab in vivo models\", \"Direct versus indirect effects on T cell fate not fully separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a mechanism for TIM4-driven cross-presentation, showing TIM4 engulfment nucleates F-actin around phagosomes to delay acidification and preserve antigen for CD8+ T cell priming.\",\n      \"evidence\": \"Live imaging of phagosome maturation, F-actin/v-ATPase recruitment assays, cross-presentation assays, in vivo TIM4-knockout tumor model\",\n      \"pmids\": [\"38607919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular trigger linking TIM4 to F-actin nucleation undefined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a therapeutically relevant TIM4 axis in liver disease, showing TIM4-mediated efferocytosis reprograms Kupffer cells to secrete IL-10 that suppresses profibrotic hepatic stellate cells in MASH.\",\n      \"evidence\": \"Kupffer-cell Timd4 conditional knockout and restoration, TIM4+ cell therapy, neutralizing antibodies, macrophage-HSC co-culture, IL-10/IL-10R assays in mouse and human MASH\",\n      \"pmids\": [\"40929246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream control of efferocytosis-to-IL-10 reprogramming unresolved\", \"Human translation of cell therapy not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TIM4's diverse non-PS ligand recognition (bacterial particles, viral glycoproteins, carbon nanotubes, microplastics) and its many reported intracellular partners (LKB1/AMPKα, SCAP/Insig1, ANXA2, αvβ3 integrin) are mechanistically integrated with its tether-only signaling architecture remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most non-canonical interactions rest on single-lab Co-IP\", \"How a tail-dispensable receptor couples to intracellular signaling partners is unexplained\", \"Relative physiological weight of each pathway unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 1, 4, 23]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 23]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [12, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 13, 26]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 5, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MERTK\", \"HAVCR1\", \"ITGB1\", \"ITGAV\", \"PRKAA1\", \"STK11\", \"ANXA2\", \"HAVCR2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}