Abstract
Transformation of human skin fibroblasts (SF) by the Kirsten murine sarcoma virus (KiMSV) is associated with their neodifferentiation into preadipose cells. Hydrocortisone or dexamethasone (DX) promote the transformation/neodifferentiation of preadipocytes to fully differentiated adipocytes. 5-Azacytidine (5-Aza-CR) by itself, or together with DX, or immediately after inoculation with KiMSV did not cause adipocytic conversion of human SF. Addition of 5-Aza-CR either before or immediately after exposure of human SF to KiMSV and DX reduced the total number of foci and significantly inhibited expression of adipocyte-containing foci. The results suggest that adipocytic conversion of human SF by KiMSV and DX is specific. This conversion apparently does not involve mechanisms directly related to the effects of 5-Aza-CR on the adipocytic conversion of murine embryo cells.
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