Key result
In canine heart tissue, isoproterenol-stimulated adenylylcyclase activity was inhibited by adenosine and carbachol, with cholinergic inhibition appearing more specific for the AV node.
This preclinical study demonstrates regional differences in adenylylcyclase activity in the canine heart and highlights that cholinergic inhibition is more specific for the AV node than adenosine.
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May indicate AV node-specific cholinergic effects in canines; leaves open human translation and requires further study.
Sugiyama et al. (1997) studied Canine heart tissue biochemistry (n=6). Isoproterenol, Adenosine, and Carbachol vs. Basal conditions was evaluated on Adenylylcyclase activity (cyclic AMP production in pmol/min/mg of protein). In canine heart tissue, isoproterenol-stimulated adenylylcyclase activity was inhibited by adenosine and carbachol, with cholinergic inhibition appearing more specific for the AV node.
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