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Haussler, Mark R.; Haussler, Carol A.; Whitfield, G. Kerr; Hsieh, Jui-Cheng; Thompson, Paul D.; Barthel, Thomas K.; Bartik, Leonid; Egan, Jan B.; Wu, Yifei; Kubicek, Jana L.; Lowmiller, Christine L.; Moffet, Eric W.; Forster, Ryan E.; Jurutka, Peter W.
Journal of steroid biochemistry and molecular biology, 07/2010, Volume: 121, Issue: 1Journal Article, Conference Proceeding
The nuclear vitamin D receptor (VDR) binds 1,25-dihydroxyvitamin D 3 (1,25D), its high affinity renal endocrine ligand, to signal intestinal calcium and phosphate absorption plus bone remodeling, generating a mineralized skeleton free of rickets/osteomalacia with a reduced risk of osteoporotic fractures. 1,25D/VDR signaling regulates the expression of TRPV6, BGP, SPP1, LRP5, RANKL and OPG, while achieving feedback control of mineral ions to prevent age-related ectopic calcification by governing CYP24A1, PTH, FGF23, PHEX, and klotho transcription. Vitamin D also elicits numerous intracrine actions when circulating 25-hydroxyvitamin D 3, the metabolite reflecting vitamin D status, is converted to 1,25D locally by extrarenal CYP27B1, and binds VDR to promote immunoregulation, antimicrobial defense, xenobiotic detoxification, anti-inflammatory/anticancer actions and cardiovascular benefits. VDR also affects Wnt signaling through direct interaction with β-catenin, ligand-dependently blunting β-catenin mediated transcription in colon cancer cells to attenuate growth, while potentiating β-catenin signaling via VDR ligand-independent mechanisms in osteoblasts and keratinocytes to function osteogenically and as a pro-hair cycling receptor, respectively. Finally, VDR also drives the mammalian hair cycle in conjunction with the hairless corepressor by repressing SOSTDC1, S100A8/S100A9, and PTHrP. Hair provides a shield against UV-induced skin damage and cancer in terrestrial mammals, illuminating another function of VDR that facilitates healthful aging.
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