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 suppresses 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 of the Ca-mobilizing agent inositol 1,4,5-trisphosphate. However, adenosine and cAMP responses are inhibited by 4 beta-phorbol 12,13-dibutyrate and 4 beta-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).
MeSH Terms
Acetylcholine/pharmacology
Adenosine/antagonists & inhibitors
Animals
Cyclic AMP/antagonists & inhibitors
Electric Conductivity
Female
Oocytes/drug effects,physiology
Phorbol Esters/pharmacology
Phorbols/pharmacology
Potassium/physiology
Protein Kinase C
Protein Kinases/physiology
Receptors, Cell Surface/drug effects
Receptors, Purinergic
Xenopus laevis
Chemicals
Phorbol Esters
Phorbols
Receptors, Cell Surface
Receptors, Purinergic
Cyclic AMP
Protein Kinases
Protein Kinase C
Adenosine
Acetylcholine
Potassium
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Dascal N
Lotan I
Gillo B
Lester H A
Lass Y
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