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Journal of Lipid Research, Vol 28, 649-658, Copyright © 1987 by Lipid Research, Inc.

ARTICLES

Hormonal regulation of the differentiation of rat adipocyte precursor cells in primary culture

O Wiederer and G Loffler

A reproducible cell culture system is described that allows the study of adipose conversion in fibroblast-like cells isolated by collagenase digestion of epididymal and perirenal adipose tissue from male rats weighing 70-200 g. Adipose conversion as measured by lipid accumulation and increase in glycerophosphate dehydrogenase (GPDH) activity during differentiation strongly depends on the density at which cells are inoculated and starts only when cells are confluent and when physiological amounts of corticosterone and insulin are added. beta- Estradiol, testosterone, thyroxine, triiodothyronine, and growth hormone do not affect the differentiation process. Methylisobutylxanthine added during the first 2 days after confluence, added with insulin and corticosterone, potentiates the effect of insulin on GPDH activity and accelerates triglyceride accumulation. The effect of methyl-isobutylxanthine seems to be mediated by increased cyclic AMP concentrations, inasmuch as it may be replaced by forskolin.
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