Acetylcholine and phorbol esters inhibit potassium currents evoked by adenosine and cAMP in Xenopus oocytes

N. Dascal, I. Lotan, B. Gillo, H. A. Lester, Y. Lass

Research output: Contribution to journalArticlepeer-review

Abstract

In Xenopus laevis oocytes, adenosine and other purinergic agonists induce a K+-conductance increase that is fully mimicked by intracellular application of cAMP. Acetylcholine suppressed the K+-conductance increase caused by adenosine, by the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine, or by intracellular injection of cAMP. This effect of acetylcholine is not mimicked by intracellular injection of Ca2+ or the Ca-mobilizing agent inositol 1,4,5-triphosphate. However, adenosine and cAMP responses are inhibited by 4β-phorbol 12,13-dibutyrate and 4β-phorbol 12-myristate 13-acetate. These results suggest that, in Xenopus oocytes, the muscarinic inhibition of purinergic and cAMP responses is mediated through the activation of the phospholipid-dependent, Ca-activated protein kinase (protein kinase C).

Original languageEnglish
Pages (from-to)6001-6005
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume82
Issue number17
DOIs
StatePublished - 1985

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