Abstract
Activated p21ras alters the platelet-derived growth factor (PDGF) signal transduction pathway in fibroblasts by inhibiting autophosphorylation of the receptor as well as by inhibiting the induction of the growth-related genes c-myc, c-fos, and JE. To elucidate the cause and effect relationships between receptor autophosphorylation and other second messenger events in the PDGF signaling pathway we created revertants of v-ras transformed cells by two methods: 1) the use of cAMP analogues, and 2) the introduction of a gene, Krev-1, which has been reported previously to revert ras transformed cells to normal morphology. Analysis of the revertants shows that the PDGF-mediated tyrosine phosphorylation of the 180-kDa PDGF receptor remains inhibited; however, the PDGF-mediated activation of phospholipase C and the induction of the growth-related genes c-myc, c-fos, and JE have been restored. These data suggest the presence of parallel pathways for PDGF signal transduction which are not dependent on autophosphorylation of the PDGF receptor.
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