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Type-specific stimulation of adenylylcyclase by protein kinase C


Type-specific stimulation of adenylylcyclase by protein kinase C



Journal of Biological Chemistry 268(7): 4604-4607



ISSN/ISBN: 0021-9258

PMID: 8383119

Ca(2+)-stimulable (type I), Ca(2+)-insensitive (type II), and Ca(2+)-inhibitable adenylylcyclase (type VI) were transiently expressed in the human embryonic kidney 293 cell line. Phorbol 12,13-dibutyrate (PDBu) increased cAMP synthesis by the Ca(2+)-insensitive type II adenylylcyclase more than 9-fold within 10 min, while the treatment had no effect on the other two types of adenylylcyclases. This stimulatory effect of PDBu on type II activity was dose-dependent and synergistic with the effect of forskolin. Another phorbol ester, phorbol 12-myristate 13-acetate (PMA), had a similar stimulatory effect on type II activity, while its inactive isomer, 4 alpha-phorbol 12-myristate 13-acetate (4 alpha-PMA), had no effect. Staurosporine, a potent protein kinase C (PKC) inhibitor, markedly attenuated the action of PDBu on cAMP synthesis by type II adenylylcyclase. These results are particularly significant in that they indicate that a species of adenylylcyclase that is insensitive to regulation by one arm of the phosphatidylinositide pathway, i.e. Ca2+, nevertheless can be regulated by the other arm, i.e. PKC.

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Accession: 018196278

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