title: Kinetics and inotropic action of probenecid in guinea-pig heart in vitro.
abstract: Probenecid (100-750 microgram . ml-1) was found to inhibit cardiac contraction force in untreated and digoxin-treated (100 microgram . ml-1) isolated right guinea-pig atrium in vitro by a reversible process, without influencing beating frequency. At low concentrations (1.5--60 microgram . ml-1), 14C-probenecid was accumulated into right atrium by an oxygen-dependent process. Correlation between uptake and negative inotropic action of probenecid could not be found.
mesh_terms: D000818:Animals; D004077:Digoxin / Q000494:pharmacology; D004347:Drug Interactions; D005260:Female; D006168:Guinea Pigs; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D007700:Kinetics; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism*; D011339:Probenecid / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D004077:Digoxin; D011339:Probenecid