title: Failing effect of digoxin on myocardial uptake of violamycin B1.
abstract: The effect of digoxin on both the negative inotropic action and the myocardial uptake of a new anthracycline antibiotic violamycin B1 has been studied in isolated guinea pig atria. In concentrations upto 2.0 X 10(-7) M/l digoxin did not prevent the negative inotropic effect of violamycin B1 caused by the concentrations of 0.7 and 5.0 X 10(-4) M/l. Corresponding to these findings, the uptake of violamycin B1 into the atrial tissue was not influenced by digoxin. However, violamycin B1 in the cardiotoxic concentration of 5.0 X 10(-4) M/l decreased the atrial uptake of digoxin. It is suggested that no competition seems to exist in myocardial uptake of anthracycline antibiotics and cardiac glycosides.
mesh_terms: D000617:Aminoglycosides / Q000009:adverse effects / Q000378:metabolism; D000818:Animals; D000900:Anti-Bacterial Agents; D000903:Antibiotics, Antineoplastic / Q000378:metabolism*; D004077:Digoxin / Q000494:pharmacology*; D004347:Drug Interactions; D006168:Guinea Pigs; D066298:In Vitro Techniques; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000378:metabolism*
chemical_list: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents; D000903:Antibiotics, Antineoplastic; C022171:violamycin BI; D004077:Digoxin