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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1985 Apr;82(7):1941–1945. doi: 10.1073/pnas.82.7.1941

Role of protein kinase C in diacylglycerol-mediated induction of ornithine decarboxylase and reduction of epidermal growth factor binding.

A M Jetten, B R Ganong, G R Vandenbark, J E Shirley, R M Bell
PMCID: PMC397453  PMID: 3157191

Abstract

Tumor-promoting phorbol esters induce ornithine decarboxylase (ODCase) activity and reduce epidermal growth factor (EGF) binding in rat tracheal epithelial 2C5 cells. Phorbol esters activate protein kinase C by interacting at the same site as sn-1,2-diacylglycerols, the presumed physiological regulators. The effects of added sn-1,2-diacylglycerols and those generated by phospholipase C treatment of 2C5 cells on ODCase induction and EGF binding were investigated to establish a role for protein kinase C in these cellular responses. Treatment of 2C5 cells with phospholipase C induced ODCase activity and reduced EGF binding, whereas phospholipases A2 and D were inactive. When sn-1,2-diacylglycerols containing fatty acids 3-10 carbons in length were added to 2C5 cells, those diacylglycerols containing fatty acids 5-10 carbons in length caused ODCase induction and reduction in EGF binding. sn-1,2-Dioctanoylglycerol was one of the most active compounds tested. It induced ODCase in a dose- (50-500 microM) and time-dependent manner. The reduction of binding of 125I-labeled EGF by sn-1,2-dioctanoylglycerol was also time and dose dependent and appeared to result from a change in EGF affinity and not the number of receptor sites. This series of sn-1,2-diacylglycerols showed similar structure-function relationships in their ability to induce ODCase activity, to decrease EGF binding, to stimulate protein kinase C, and to inhibit [3H]phorbol dibutyrate binding to the phorbol ester receptor. These data demonstrate biological activities for a number of diacylglycerols and indicate that protein kinase C activation is implicated in ODCase induction and decreased EGF binding.

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Selected References

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