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. 1978 Feb;75(2):862–865. doi: 10.1073/pnas.75.2.862

Cyclic AMP-dependent protein kinase mediates a cyclic AMP-stimulated decrease in ornithine and S-adenosylmethionine decarboxylase activities.

P A Insel, J Fenno
PMCID: PMC411357  PMID: 204937

Abstract

Incubation of S49 lymphoma cells with N6,O2'-dibutyryl cyclic AMP (Bt2cAMP) decreases the activities of ornithine decarboxylase (L-ornithine carboxy-lyase; EC 4.1.1.17) and S-adenosylmethionine decarboxylase (S-adenosyl-L-methionine carboxy-lyase; EC 4.1.1.50), the two principal enzymes in the pathway of polyamine synthesis. This decrease is dose-dependent, commences after a 3-hr delay, virtually abolishes the assayable activities of the two enzymes, and is not associated with a soluble inhibitor of the enzyme activities. Studies in mutant S49 clones that have altered protein kinase indicate that cAMP-dependent protein kinase mediates the decreases in enzyme activities. The dose-response pattern for the cAMP-stimulated decrease in enzyme activities parallels the pattern for the cAMP-stimulated, cell cycle-specific (G1) growth arrest of S49 cells. The activity of ornithine decarboxylase decreases faster than Bt2cAMP arrests wild-type S49 cells and, similarly, release of cells from the cAMP-stimulated arrest in G1 increases the activity of ornithine decarboxylase faster than cells exit from G1. These findings contrast with reports that cAMP induces ornithine decarboxylase in other cell types and further suggest that passage of cells through cell cycle is required for maintaining the activities of ornithine and S-adenosylmethionine decarboxylases.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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