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Mol Cell Biol. 1991 October; 11(10): 5381-5387

Cell-specific regulation of oncogene-responsive sequences of the c-fos promoter.

A Gutman, C Wasylyk and B Wasylyk

Laboratoire de Génétique Moleculaire des Eucaryotes, Faculté de Médecine, Strasbourg, France.

ABSTRACT

We have identified oncogene-responsive sequences in the human c-fos promoter that mediate induction of transcription by several nonnuclear oncoproteins and the tumor promoter TPA. These sequences are regulated in a cell-specific manner. (i) In NIH 3T3 cells, the CArG box of the c-fos promoter is sufficient to mediate activation by oncogenes. (ii) In contrast, in HeLa cells, additional flanking sequences are also required, including the outer arm of the serum response element and the FAP site. We also show that the serum response factor, which binds to the CArG box, activates transcription in vivo in NIH 3T3 cells but not in HeLa cells. Finally, we present evidence that the intracellular level of the c-Fos protein could be a major determinant of cell-specific regulation of these oncogene-responsive elements of the c-fos promoter.

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Mol Cell Biol. 1991 October; 11(10): 5381-5387

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