Abstract
A stimulative effect of 1,25-dihydroxyvitamin D3 was tested on osteoblastic cells, clone MC3T3-E1, cultured in serum-free medium with 0.1% bovine serum albumin. This steroid increased alkaline phosphatase activity in a dose-related fashion. The steroid also stimulated dose-dependently collagen and non-collagen protein syntheses, their maximal effects being observed at 12 and 24 h, respectively. The incorporation of [3H]-proline into collagen or non-collagen protein in cells exposed to this steroid for 12 h was 2.9 or 1.9-fold over that of control cultures, respectively. These results strongly indicate the stimulative effects of 1,25-dihydroxyvitamin D3 on the differentiation of osteoblasts in vitro.
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