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- W2005120893 abstract "Vitamin D3 metabolites have been found to improve psoriasis but their mechanism of action is not clear. Keratinocyte proliferation and differentiation are known to be dependent on calcium concentrations in vitro. The aim of this study was to examine whether 1α, 25(OH)2 vitamin D3 had any direct effect on intracellular free calcium concentrations in cultured keratinocytes. A response to 1α, 25(OH)2 vitamin D3 was seen in 88% of monolayers of normal human keratinocytes attached to glass coverslips. An increase in intracellular free calcium was seen in 80% of the reactive cultures, with over half the responses occurring within 30 s of exposure to 1α, 25(OH)2 vitamin D3 and the remainder occurring within minutes. Responses could be seen at physiological concentrations of 1α. 25(OH)2 vitamin D3 and were not blocked by the protein synthesis inhibitor cycloheximide. The response to 1α, 25(OH)2 vitamin D3 took the form of rapid transient increases in intracellular free calcium in 29 out of 59 coverslips. The basal intracellular free calcium was calculated to be 245 ± 47 nm rising to a maximum of 854 ± 67 nm (mean ± SEM; n= 20) following exposure to 1α, 25(OH)2 vitamin D3. We conclude that 1α, 25(OH)2 vitamin D3 acts directly on keratinocytes to increase intracellular free calcium and that this may be relevant to its mechanism of action in psoriasis." @default.
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- W2005120893 title "1α,25(OH)2 vitamin D3 increases intracellular calcium in human keratinocytes" @default.
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- W2005120893 doi "https://doi.org/10.1111/j.1365-2133.1991.tb00566.x" @default.
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