PMID: 2507555Oct 1, 1989Paper

Differential effects of fibroblast growth factor and tumor promoters on the initiation and maintenance of adipocyte differentiation

The Journal of Cell Biology
M Navre, G M Ringold

Abstract

Fibroblast growth factor (FGF) has been shown to inhibit the differentiation of myogenic and adipogenic cell lines without inducing a proliferative response. We have previously shown that agents capable of activating protein kinase C (PKC), such as FGF and the phorbol ester tetradecanoyl phorbol-13-acetate (TPA), inhibit the differentiation of the adipogenic cell line TA1, as measured by the rapid loss of adipocyte-specific RNAs. We report here that the treatment of fully differentiated TA1 adipocytes with FGF at 10 ng/ml induces the reversal of adipocyte differentiation, even in cells where PKC activity has been down-regulated by TPA pretreatment. In contrast, TPA or lower concentrations of FGF (1 ng/ml), both effective inducers of c-fos RNA in adipocytes, fail to reverse adipocyte differentiation. The adipocytes, however, will extinguish differentiation-specific functions in response to TPA by the addition of a calcium ionophore. Therefore, we propose that there are two FGF-sensitive pathways in TA1 cells: one responsible for the initiation of differentiation (TPA sensitive) and another required for maintenance of the adipose phenotype (TPA insensitive). These results suggest that activation of two distinct signaling pathways...Continue Reading

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