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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

c-myc gene expression is stimulated by agents that activate protein kinase C and does not account for the mitogenic effect of PDGF.

The role of the phosphoinositide turnover-protein kinase C pathway in mediating PDGF-stimulated c-myc expression and cell proliferation was studied. Both direct activators of kinase C (e.g. phorbol ester analogues) and hormones that activate kinase C via receptor-mediated phosphoinositide turnover (e.g. PDGF, bradykinin, or vasopressin) elicited a rapid increase in c-myc mRNA expression. Desensitization of the kinase C pathway by prolonged exposure to phorbol abolished the induction of c-myc by subsequent phorbol challenge and attenuated c-myc induction by PDGF and bradykinin, but did not affect PDGF-stimulated mitogenesis. Bradykinin and phorbol esters stimulated the same magnitude of c-myc expression as PDGF but elicited less than one-tenth the PDGF-induced mitogenic response. We conclude that stimulation of c-myc expression is a common response to a diverse group of agents that elicit phosphoinositide turnover and activate protein kinase C, and that neither activation of protein kinase C nor enhanced c-myc expression is sufficient for the mitogenic action of PDGF.[1]


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