title: Potentiation of the negative chronotropic and inotropic effects of adenosine by 2-phenylaminoadenosine.
abstract: 1. Effects of 2-phenylaminoadenosine on SA nodal pacemaker activity and atrial contractility were studied, using eleven isolated, blood-perfused dog atrial preparations. The compounds were administered via the cannulated sinus node artery of the isolated atrium. 2. 2-Phenylaminoadenosine induced negative chronotropic and inotropic effects and was 100 times less potent than adenosine in this action. 3. The interaction between adenosine and 2-phenylaminoadenosine was studied. 2-Phenylaminoadenosine potentiated the effect of adenosine on atrial muscle, but not that of acetylcholine.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D000818:Animals; D004285:Dogs; D004357:Drug Synergism; D006339:Heart Rate / Q000187:drug effects*; D066298:In Vitro Techniques; D009200:Myocardial Contraction / Q000187:drug effects*
chemical_list: C026708:2-phenylaminoadenosine; D000241:Adenosine; D000109:Acetylcholine