Basic fibroblast growth factor: production, mitogenic response, and post-receptor signal transduction in cultured normal and transformed fetal bovine aortic endothelial cells.

Abstract:

:Normal FBAE AG 7680 cells and chemically transformed FBAE GM 7373 cells were compared for their capacity to produce and to respond to bFGF. Normal FBAE cells showed higher levels of bFGF protein and of poly(A)+ bFGF mRNA than transformed GM 7373 cells, indicating that chemical transformation in FBAE cells is paralleled by a decrease of bFGF gene expression. Basic FGF induced cell proliferation in both normal and transformed FBAE cells. However, bFGF appeared to be much more potent in transformed than in normal cells. No differences in bFGF membrane receptors were observed between normal and transformed FBAE cells in terms of apparent molecular weight, number per cell, dissociation constant, and kinetic of downregulation. In respect to normal cells, however, transformed GM 7373 cells showed higher basal levels of PKC activity. This kinase is activated by bFGF and is involved in mediating the mitogenic activity of bFGF, as shown by the capacity of the PKC inhibitor H-7 to abolish the mitogenic activity of bFGF both in normal and transformed FBAE cells. Like bFGF, the PKC activators DAG and TPA exerted a stronger mitogenic activity in transformed than in normal FBAE cells. Thus, the different susceptibility of normal and transformed FBAE cells to bFGF appears to depend on differences in the post-receptor signal transduction mediated by PKC rather than on differences in bFGF receptors. The results indicate that chemical transformation causes significant modifications of bFGF physiology in FBAE cells. The relevance of these modifications to the genesis of tumors of vascular origin deserves further investigation.

journal_name

J Cell Physiol

authors

Presta M,Maier JA,Rusnati M,Ragnotti G

doi

10.1002/jcp.1041410310

subject

Has Abstract

pub_date

1989-12-01 00:00:00

pages

517-26

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

141

pub_type

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