RESUMEN
Some evidence indicates that the inotropic effect of cardiac glycosides occurs at concentrations too low to affect Na+,K+-ATPase activity. This suggests that some receptor other than Na+,K+-ATPase mediates the inotropic effect. We studied ouabain binding to sarcolemma-enriched preparations from canine ventricle under conditions known to promote binding to Na+,K+-ATPase. Profiles for binding and dissociation were characterized by two kinetic components: (1) fast association and slow dissociation; (2) slow association and fast dissociation. Profiles in the absence of supporting ligands were consistent with a single species of receptors with slow association, fast dissociation and minimal effect on Na+,K+-ATPase activity. Binding supported by magnesium plus inorganic phosphate inhibited Na+,K+-ATPase activity by 86%. The two binding components were affected differentially by heating at 55 degrees C. It was concluded that the preparation possesses two receptors for ouabain: the Na+,K+-ATPase and a "new" receptor. The latter may be different chemically from the Na+,K+-ATPase. The more likely possibility is that the "new" receptor is the Na+,K+-ATPase in a state characterized by low catalytic activity, low affinity for ouabain, and no requirement of specific ligands for ouabain binding. Further, the data suggest an interdependence between the two forms. This leads to a mechanism which allows an inotropic effect to precede loss of Na+,K+-ATPase activity even though both result from glycoside binding to Na+,K+-ATPase. The mechanism involves an equilibrium between inactive and active forms of the Na+,K+-ATPase such that the inactive form buffers loss of the active form upon exposure to a cardiac glycoside.
Asunto(s)
Ouabaína/metabolismo , Receptores de Droga , Sarcolema/fisiología , Animales , Sitios de Unión , Tampones (Química) , Perros , Potasio/farmacología , Dodecil Sulfato de Sodio/farmacología , ATPasa Intercambiadora de Sodio-Potasio/fisiología , Factores de Tiempo , Función VentricularRESUMEN
A highly enriched sarcolemma preparation was isolated by differential centrifugation of a canine ventricular homogenate followed by centrifugation of a membrane fraction layered over 22% (w/v) sucrose. Ouabain binding, ouabain-sensitive potassium phosphatase activity and 5'-nucleotidase activity were enriched 19--27 fold over the homogenate whereas Ca2+-ATPase and succinate dehydrogenase activities were 0.75 and 0.36, respectively, of that for the homogenate. The isolation procedure was relatively rapid and yielded about 2.0 mg protein/100 g of ventricular muscle. The highest salt concentration used in the procedure was 0.6 M KCl and no detergents were employed. Initial characterization studies suggested that the sarcolemma-enriched fraction consists predominantly if not totally of freely permeable membrane vesicles and that the sarcolemma does not manifest a Ca2+-ATPase activity, at least within the limits of the assay procedures employed. This preparation was concluded to be about 1.5- to 4-fold more highly enriched with sarcolemmal markers than preparations obtained by previously published procedures. Accordingly, the preparation provides an improved basis for the probe of calcium movements that occur across the sarcolemma in association with the excitation-contraction-relaxation sequence of the mammalian myocardial cell.