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• W2006098291 abstract "High- and low-affinity digitalis receptors coexist in rat cardiac sarcolemma. In this study, their relative involvement in the inotropic effect of ouabain was evaluated on an isolated Langendorff rat heart preparation working under isovolumic conditions at a low external calcium concentration (0.25 mM). This involvement was estimated according to both the development of the inotropic response to ouabain (10−8–10−4 M) and the time course of the washing out the biological effect. In each phenomenon considered, and whatever the index of inotropy chosen, the high-affinity digitalis receptor (ec50: 1–2 × 10−8 M) contributed to 25–40% of the maximal inotropy (evoked by 10−4 m ouabain). Low-affinity receptors (ec50: 1–2 × 10−5 M) acounted for 60–75%. These apparent affinities were identical to those previously determined in sarcolemma isolated from rat heart perfused with 0.25 mM Ca2+. The biphasic effect of ouabain was related to both the inhibition of high- and low-sensitivity Na+, K+-ATPase forms and the corresponding number of ouabain-binding sites occupied. These results support the concept that the Na+, K+-ATPase highly sensitive to ouabain as revealed by lowering calcium is in the in vivo manifestation of the high-sensitivity inotropic component." @default.
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• W2006098291 date "1986-10-01" @default.
• W2006098291 modified "2023-10-14" @default.
• W2006098291 title "Respective involvements of high- and low- affinity digitalis receptors in the inotropic response of isolated rat heart to ouabain" @default.
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• W2006098291 doi "https://doi.org/10.1016/0006-2952(86)90611-8" @default.
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