Platelet-derived growth factor and double-stranded ribonucleic acids stimulate expression of the same genes in 3T3 cells

Abstract

Platelet-derived growth factor (PDGF) stimulates expression of a "competence" gene family in Balb/c-3T3 cells. The competence family contains the c-myc and c-fos genes together with several functionally uncharacterized genes (JE, KC, and r-fos) that have been isolated as cDNA clones. We show that double-stranded ribonucleic acid is a potent inducer of the competence gene family. Infection with vesicular stomatitis virus also induces expression of this gene family. Conversely, PDGF stimulates expression of genes hitherto characterized as responsive to double-stranded ribonucleic acids, including the beta-fibroblast interferon and (2'-5')-oligoadenylate synthetase genes. These PDGF-inducible genes could conceivably function in a feedback loop to control 3T3 cell growth. Some of the genes, such as c-fos and c-myc, are induced quickly by PDGF and may initiate a round of cell division. Others, such as beta-fibroblast interferon and (2'-5')-oligoadenylate synthetase, are induced more slowly and may function as feedback inhibitors of the growth response to PDGF.