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Suppression of v-Src transformation in primary rat embryo fibroblasts.

Abstract：

:To understand the mechanism for resistance of primary cultures of rat embryo fibroblasts (REFs) to oncogene-induced transformation, we studied the transforming ability of a recombinant retrovirus, ZSV, containing v-src and neo genes in REFs and in the rat cell line F2408. The susceptibility of REFs to p60v-src transformation was markedly reduced when compared with that of F2408 cells, despite high levels of expression of functional p60v-src tyrosine kinase in the two systems. In hybrid cells obtained by somatic cell fusion between F2408 cells transformed by v-src and uninfected REFs, the transformed phenotype was suppressed despite persistent expression of p60v-src tyrosine kinase. On the other hand, hybrid cells between v-src transformed F2408 cells and uninfected F2408 cells retained the transformed phenotypes. These results indicate that primary cells possess an intracellular function(s) that cause suppression of the transformed phenotype induced by the v-src gene. In ZSV-infected REFs, tyrosine phosphorylation of cellular proteins, including p125 focal adhesion kinase, p70 paxillin and p130 was similar to that in the ZSV-infected F2408 cells, indicating that tyrosine phosphorylation of these proteins is not sufficient for the expression of transformed phenotype. On the other hand, cellular fibronectin and one of integrin receptors were downregulated in the ZSV-transformed F2408 cells but not in ZSV-infected REFs, suggesting that fibronectin and/or its receptor might play a role in suppressing v-src transformation in primary rat cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Inoue H,Tavoloni N,Hanafusa H

subject

Has Abstract

pub_date

1995-07-20 00:00:00

pages

231-8

issue

2

eissn

0950-9232

issn

1476-5594

journal_volume

11

pub_type

杂志文章

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