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. 1995 Feb 15;306(Pt 1):47–56. doi: 10.1042/bj3060047

Analysis of c-fos expression in the butyrate-induced F-98 glioma cell differentiation.

S J Tang 1, Y M Huang 1, F F Wang 1
PMCID: PMC1136480  PMID: 7864828

Abstract

The functional induction of c-fos in the sodium butyrate-induced differentiation of F-98 glioma cells was studied. Fos protein level was increased by butyrate. In contrast, c-Jun protein was constitutively expressed and was not affected by butyrate. Gel-retardation assay indicates Fos as a component of the complex formed between the consensus oligonucleotide of the TPA (PMA, phorbol 12-myristate 13-acetate) response element (TRE) and nuclear extract prepared from butyrate-treated cells. Transfection studies showed that butyrate increased transcription from a multimeric TRE-driven reporter construct, and the effect was mimicked by transfecting cells with fos-expression plasmid. Furthermore, under conditions of c-fos over-expression, transactivation by butyrate was essentially abolished. These data suggest that Fos induction had a functional role in gene activation. Characterization of stable c-fos transfectants demonstrated that these cells displayed alterations in morphology, showed serum-dependent growth, had slower growth rates and grew to lower saturation densities than did untransfected F-98 cells or transfected cells that did not express c-fos. Immunofluorescent staining indicated that fos transfectants also had elevated glial fibrillary acidic protein ('GFAP') expression. Transfection of the c-fos promoter-chloramphenicol acetyltransferase fusion gene into F-98 cells revealed that activation of c-fos by butyrate was exerted at the promoter level, and sequences located within nucleotides -757 to -402 of the c-fos promoter were responsible for butyrate induction. Our data indicate that transcriptional activation of c-fos through its promoter by butyrate resulted in increased Fos protein expression. Transfection studies show that both c-fos and butyrate activate TRE-containing genes, and fos may be a downstream mediator of butyrate. Furthermore, expression of c-fos plays a major role in modulating the growth properties of F-98 cells.

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