{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe vitamin D receptor (VDR) is a ligand‐activated nuclear receptor that mediates the classical endocrine actions of the active vitamin D hormone, 1α,25‐dihydroxyvitamin D₃. It is essential for calcium absorption and bone homeostasis, as illustrated by loss‐of‐function models that recapitulate human bone and growth plate abnormalities. Moreover, VDR exhibits dual binding pockets that enable both genomic and rapid, non‐genomic responses and regulates an extensive portion of the genome, underscoring its ubiquitous presence in diverse tissues."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its skeletal functions, VDR plays critical roles in modulating immune and barrier functions. It can directly attenuate inflammatory signaling—for example, through interactions that inhibit NF‐κB activation and repress proinflammatory cytokines such as IL‐17—and is essential for maintaining the integrity of intestinal epithelial junctions, thereby protecting against colitis. In addition, VDR influences the composition of the gut microbiota and is implicated in adipocyte biology and respiratory health, extending its impact to metabolic and pulmonary systems."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nVDR also contributes to detoxification and metabolic regulation. It functions as a receptor for not only vitamin D but also for secondary bile acids such as lithocholic acid, thereby inducing the expression of cytochrome P450 enzymes (e.g., CYP3A) that are responsible for detoxifying harmful compounds. In this context, VDR activity intersects with other nuclear receptors and is finely tuned by ligand‐dependent structural dynamics that influence coactivator recruitment and gene transcription."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic polymorphisms of the VDR gene have been widely studied and linked to susceptibility to a range of diseases. Variants have been associated with autoimmune disorders such as rheumatoid arthritis and systemic lupus erythematosus, metabolic and infectious diseases including type 1 diabetes and tuberculosis, and various cancers like prostate, breast, and colorectal cancer. In bone, specific VDR haplotypes correlate with reduced mRNA expression and an elevated fracture risk, while other studies show associations with asthma, atopy, and even alterations in fetal growth. Overall, these associations underscore the importance of VDR genetic variability in modulating disease risk and therapeutic responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "37"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nVDR expression is not confined to classical target organs; it is also present in the brain, reproductive tissues, and muscle. In the human brain, both neurons and glial cells express VDR along with the activating enzyme 1α‐hydroxylase, suggesting a role in neural autocrine/paracrine signaling. Similarly, VDR in the testis and other reproductive structures—as well as its emerging role in modulating mitochondrial function and dynamics in skeletal muscle—points to broader functions in neuroendocrine regulation and energy metabolism."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "38", "end_ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies reveal that VDR signaling interconnects with other regulatory pathways. For example, VDR activation can modulate the expression of metabolic regulators such as PPARδ, and its dynamic interplay with coactivators and other nuclear receptors further refines its transcriptional output. 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