Abstract
Cultured rat epididymal preadipocytes exposed for 24–72 h to either bezafibrate or clofibrate added to the culture medium were extensively converted to fat-loaded adipocytes. Adipocyte conversion increased during the first 5–7 days following plating, reaching a level of 100% and 60% conversion with bezafibrate and clofibrate, respectively, as compared to 10% conversion in their absence. Adipocyte conversion in culture was a saturable function of the hypolipidemic effectors and was associated with an increase in the incorporation rate of exogenous palmitate into triacylglycerols, in glycerol-3-phoshate dehydrogenase and hormone-sensitive lipase activities but not in lipoprotein lipase activity. Adipocyte conversion by hypolipidemic drugs was much more prominent than that exerted by dibutyryl cAMP, and the relative conversion efficiency of the two fibrate drugs did not correlate with their respective cAMP content of the culture. Hence, hypolipidemic drugs and dibutyryl cAMP appear to act independently in initiating adipose conversion in primary epididymal preadipocytes.
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