1?, 25 ? Dihydroxyvitamin D modulates the growth of 3T3 cells and human skin fibroblasts stimulated by platelet-derived growth factor

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Abstract
We investigated the effect of 1.alpha.,25-dihydroxyvitamin D3 (1,25(OH)2 vit D3) on the 3H-thymidine uptake by Balb/c 3T3 cells and by human skin fibroblasts stimulated by normal human serum or by purified PDGF. We found an inhibitory effect of 1,25(OH)2 vit D3 on the DNA synthesis of Balb/c 3T3 cells grown in the presence of human serum as well as in the presence of PDGF. At 5% human serum this effect is minimal at 10-12 M 1,25(OH)2 vit D3 and is maximal at 10-9 M. On the DNA synthesis of human fibroblasts stimulated by human serum or by PDGF a modulatory effect of 1,25(OH)2 vit D3 was shown. On these cells the vitamin had a stimulatory effect between 10-11 and 10-9 M and an inhibitory effect at very high concentrations (10-7 M). Our results suggested that the effect of 1,25(OH)2 vit D3 on fibroblast DNA synthesis could be mediated by interactions with its specific intracellular receptor. 1,25(OH)2 vit D3 had no any action on the growth of human fibroblasts stimulated by fibroblast growth factor.

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