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. 1990 Jan;9(1):171–180. doi: 10.1002/j.1460-2075.1990.tb08093.x

ras-induced c-fos expression and proliferation in living rat fibroblasts involves C-kinase activation and the serum response element pathway.

C Gauthier-Rouvière 1, A Fernandez 1, N J Lamb 1
PMCID: PMC551643  PMID: 2104799

Abstract

We have examined the early events involved in the proliferative activation of quiescent rat embryo fibroblasts by microinjection of oncogenic ras protein. Cells injected with ras show a transient expression of c-fos after 30-60 min visualized by immunofluorescence in the nucleus. This c-fos expression can be specifically suppressed by coinjection of a double-stranded oligonucleotide which corresponds to the serum response element (SRE) present in the c-fos promoter, implying that ras utilizes a pathway which activates the binding of serum response factor(s) (SRF) to SRE to induce c-fos transcription. Inhibition of this pathway also abolished ras-induced DNA synthesis indicating that the proliferative induction by ras requires expression of SRE-regulated genes. Both c-fos induction and DNA synthesis were prevented when ras oncoprotein was injected into quiescent cells together with either antibodies against calcium phospholipid-dependent protein kinase (C-kinase) or a synthetic peptide that specifically inhibits C-kinase. These data demonstrate the involvement of both functional C-kinase and the SRE pathway in the activation of quiescent cells by ras and suggest a potential relationship in their mechanism of action.

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