Inhibition of protein synthesis reduces the positive inotropic effect of ouabain.
The positive inotropic effect of ouabain on atria and ventricle strips of cycloheximide-pretreated (20 mg/kg i.p. 3 hr before sacrifice) guinea-pigs and rats was significantly reduced or absent. Similar results were obtained when actinomycin (8 X 10(-6)M) was added to the perfusion medium of rat ventricle strips for 30 min before ouabain. These results suggest that either the synthesis of a short-lived protein is required for the inotropic effect of ouabain, or that at least part of ouabain's inotropic effect is due to the stimulated synthesis of some protein(s).
D000818:Animals; D003513:Cycloheximide / Q000494:pharmacology; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism*; D010042:Ouabain / Q000494:pharmacology*; D014176:Protein Biosynthesis; D051381:Rats; D013268:Stimulation, Chemical
D010042:Ouabain; D003513:Cycloheximide