FIBROBLAST GROWTH FACTOR-DEPENDENT MITOGENIC SIGNAL TRANSDUCTION PATHWAY IN CHEMICALLY TRANSFORMED MOUSE FIBROBLASTS IS SIMILAR TO BUT DISTINCT FROM THAT INITIATED BY PHORBOL ESTERS

被引:25
作者
BUCHOU, T
MESTER, J
机构
[1] INSERM U 55, Hôpital St.-Antoine, Paris
关键词
D O I
10.1002/jcp.1041420315
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Treatment of the quiescent, chemically transformed Balb/c mouse 3T3 cells (BP‐A31) with fibroblast growth factor (FGF) leads to reinitiation of the cell division cycle in a large proportion of the cells. The characteristics of the mitogenic action of FGF closely resemble those of phorbol esters (activators of protein kinases type C) and differ from those of insulin (mediated by insulin‐like growth factor 1 receptors). In particular, the effects of FGF as well as of phorbol‐2‐myristate‐13‐acetate (PMA), unlike the effects of insulin, are prevented by a low concentration (7.5 nM) of staurosporin (an efficient inhibitor of protein kinase C) as well as by 3‐isobutyl‐1‐methyl xanthin (IBMX). Both FGF and PMA are good inducers of the accumulation of c‐fos and c‐jun mRNAs, whereas insulin has little effect. However, FGF was fully active (both as a mitogen and as inducer of c‐fos mRNA accumulation) also in cells where the protein kinase C‐mediated pathway had been downregulated by a long exposure to phorbol dibutyrate. We propose that the mitogenic effect of FGF does not require activation of protein kinase C, but that the subsequent events in the transduction pathways initiated by FGF and PMA, respectively, are (in part) coincident. Copyright © 1990 Wiley‐Liss, Inc.
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页码:559 / 565
页数:7
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