Genomic mechanisms involved in the pleiotropic actions of 1,25-dihydroxyvitamin D3

S Christakos, M Raval-Pandya, R P Wernyj, W Yang, S Christakos, M Raval-Pandya, R P Wernyj, W Yang

Abstract

The biologically active metabolite of vitamin D (cholecalciferol), i.e. 1,25-dihydroxyvitamin D3 [1,25(OH)2D3], is a secosteroid hormone whose mode of action involves stereospecific interaction with an intracellular receptor protein (vitamin D receptor; VDR). 1,25(OH)2D3 is known to be a principal regulator of calcium homeostasis, and it has numerous other physiological functions including inhibition of proliferation of cancer cells, effects on hormone secretion and suppression of T-cell proliferation and cytokine production. Although the exact mechanisms involved in mediating many of the different effects of 1,25(OH)2D3 are not completely defined, genomic actions involving the VDR are clearly of major importance. Similar to other steroid receptors, the VDR is phosphorylated; however, the exact functional role of the phosphorylation of the VDR remains to be determined. The VDR has been reported to be regulated by 1,25(OH)2D3 and also by activation of protein kinases A and C, suggesting co-operativity between signal transduction pathways and 1,25(OH)2D3 action. The VDR binds to vitamin D-responsive elements (VDREs) in the 5' flanking region of target genes. It has been suggested that VDR homodimerization can occur upon binding to certain VDREs but that the VDR/retinoid X receptor (RXR) heterodimer is the functional transactivating species. Other factors reported to be involved in VDR-mediated transcription include chicken ovalbumin upstream promoter (COUP) transcription factor, which is involved in active silencing of transcription, and transcription factor IIB, which has been suggested to play a major role following VDR/RXR heterodimerization. Newly identified vitamin D-dependent target genes include those for Ca2+/Mg(2+)-ATPase in the intestine and p21 in the myelomonocytic U937 cell line. Elucidation of the mechanisms involved in the multiple actions of 1,25(OH)2D3 will be an active area of future research.

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