{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNFIL3 (also known as E4BP4) is emerging as a multifaceted transcriptional regulator that critically modulates immune and inflammatory responses. In T cells, for example, NFIL3 – which is up‐regulated under glucocorticoid stimulation in a Ca²⁺‐dependent manner – is associated with apoptosis of sensitive lymphoid cells, while in systemic lupus erythematosus it is overexpressed in CD4⁺ T cells to inhibit activation via epigenetic suppression of CD40L. Moreover, NFIL3 limits T follicular helper cell differentiation through recruitment of histone deacetylase and Polycomb repressive complexes and is essential for proper natural killer cell development, with its posttranslational modifications influencing Notch1 target regulation. In respiratory epithelial cells, NFIL3 mediates interleukin‑17A–dependent improvements in glucocorticoid sensitivity, and its elevated expression is also observed in autoimmune inflammatory settings such as rheumatoid arthritis and Kawasaki disease, as well as in atherosclerosis, underscoring its role in modulating aberrant inflammatory cytokine networks."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n\nNFIL3 also exerts significant control over oncogenic processes by reconfiguring gene expression programs that affect cell survival, invasion, and chemoresistance. In several cancer models—including lung adenocarcinoma, choriocarcinoma, and osteosarcoma—NFIL3 has been shown to act either as a transcriptional repressor (for instance, by restricting FOXO access to pro‑apoptotic genes such as TRAIL, FAS, and GADD45 isoforms via recruitment of chromatin modifiers) or as an activator (by up‐regulating targets like the prion protein [PRNP]). In leukemia cells, NFIL3 is implicated downstream of glucocorticoid receptor signaling to regulate survival genes (such as RCAN1‑1), while it also represses tumor suppressors like RASSF8 in breast cancer. Taken together, these findings illustrate that NFIL3 modulates distinct transcriptional programs that can tip the balance between apoptosis and survival in tumor cells, with additional structural studies revealing its binding preference for specific DNA motifs and the deleterious impact of mutations on this activity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "20"}]}, {"type": "t", "text": "\n\nBeyond immune regulation and cancer, NFIL3 plays important roles in metabolic homeostasis, circadian control, and neuro‑cardiac protection. In the liver, NFIL3 represses FGF21 expression through G9a‐dependent histone methylation, thereby influencing metabolism during feeding–fasting cycles, while changes in the commensal gut microbiota can alter its rhythmic expression to affect obesity and insulin resistance. In addition, NFIL3 confers neuroprotection in models of amyotrophic lateral sclerosis and supports cardiomyocyte survival and proper embryonic heart development. Finally, genome‐wide association studies have identified nominal links between polymorphisms in NFIL3 and neurodevelopmental conditions, highlighting its broader importance in both metabolic and neuronal signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Saul J Priceman, Jonathan D Kirzner, Laura J Nary, et al. 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