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1,25(OH)2D3-regulated human keratinocyte proliferation and differentiation: basic studies and their clinical application Bikle DDJ Nutr 1995[Jun]; 125 (6 Suppl): 1709S-1714SKeratinocytes produce vitamin D, metabolize it to its most biologically active form, 1,25(OH)2D, and respond to the 1,25(OH)2D they produce with a decrease in proliferation and an increase in differentiation. 1,25(OH)2D production by keratinocytes is tightly controlled and changes as the cells differentiate, increasing during the early stages of differentiation and then decreasing again as terminal differentiation ensues. The 1,25(OH)2D produced endogenously or supplied exogenously acts in concert with calcium and products of phosphoinositide metabolism to stimulate the transition from a proliferating basal cell to a terminally differentiated corneocyte. The mechanisms involved include changes in gene transcription and messenger RNA stability. These antiproliferative, prodifferentiating actions of 1,25(OH)2D3 have led to its successful use in psoriasis, a hyperproliferative skin disease, and may lead to its use as a chemopreventive agent in malignancy.|Animals[MESH]|Calcitriol/biosynthesis/*physiology[MESH]|Cell Differentiation/drug effects[MESH]|Cell Division/drug effects[MESH]|DNA/biosynthesis[MESH]|Humans[MESH]|Keratinocytes/*physiology[MESH]|Psoriasis/drug therapy[MESH]|Transcription, Genetic/physiology[MESH] |