{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTNFSF4, which encodes the OX40 ligand (OX40L), is a critical co‐stimulatory molecule expressed on activated antigen‐presenting cells – including dendritic cells, mast cells, and select lymphocyte subsets – that links innate signals to adaptive T‐cell responses. Upstream mediators such as thymic stromal lymphopoietin (TSLP) and prostaglandin E₂ induce TNFSF4 expression, thereby promoting T‑cell activation and differentiation. Engagement of OX40L with its receptor OX40 on naïve and memory T cells enhances proliferation and drives the polarization of helper T cells toward an inflammatory Th2 profile (with increased production of cytokines such as TNF‑α and IL‑4) while simultaneously inhibiting regulatory outputs (such as IL‑10 and, under some conditions, IL‑17). This coordinated costimulatory activity is central to the pathogenesis of allergic diseases including atopic dermatitis, asthma, and allergic rhinitis, as evidenced by altered OX40/OX40L expression patterns in patients with these conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic and functional studies have consistently implicated TNFSF4 in the etiology of several autoimmune and vascular disorders. Associations at the TNFSF4 locus have been reported with systemic lupus erythematosus (SLE), lupus nephritis, systemic sclerosis, primary Sjögren’s syndrome, and rheumatoid arthritis, supporting a role for dysregulated OX40L expression in promoting aberrant T‑cell–antigen presenting cell interactions and the ensuing inflammatory cascade. In the cardiovascular system, increased TNFSF4 expression by macrophages and endothelial cells has been linked to enhanced atherosclerotic lesion formation and myocardial infarction, particularly in susceptible patient subsets, thereby underscoring its contribution to vascular inflammation and atherothrombosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "23"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its established role in adaptive immunity, TNFSF4 also modulates innate responses and influences outcomes in sepsis and cancer. OX40L expressed on natural killer cells and monocytes enhances antiviral and antileukemic responses—often indirectly bolstering CD8⁺ T‑cell proliferation and cytotoxic activity—through signaling pathways that involve PI3K/AKT and p38 MAPK. This signaling can suppress IL‑17 production while promoting IFN‑γ secretion, thus fine-tuning the balance between inflammation and regulation. In tumor microenvironments, stress conditions provoke TNFSF4 expression in fibroblasts, contributing to chemoresistance via NF‑κB and BCL‑XL pathway activation; additionally, targeted modulation of TNFSF4 in hematologic malignancies has been shown to alter cytokine profiles and impair regulatory T‑cell expansion, thereby enhancing antitumor immunity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "24", "end_ref": "32"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Douglas W Grosenbach, Jeffrey Schlom, Linda Gritz, et al. 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