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- W4300245722 abstract "A method described by Bieltvedt & Briseid (1966) and Bieltvedt (1967) for the determination of the inhibition by cardiac glycosides of the isolated, histamine-stimulated guinea pig ileum was modified to estimate the inhibition of the acetylcholine-stimulated rat jejunum. The glycoside concentrations causing 50 % inhibition of submaximal, isotonic contractions were determined, and the procedure was based on 20-minute contact periods between the muscle preparations and the cardioactive substances, and then 22-minute equilibration periods with chemical stimulation. The degree of inhibition was found to depend on the potassium content of the Tyrode solutions used. In a low potassium Tyrode solution (1.8 mM) the inhibition of the rat intestine by cardiac glycosides was found to be of the same order of magnitude as the inhibition of the guinea pig intestine. When the potassium chloride concentration was increased to 2.7 mM, the well known species difference was observed, the concentration of cardiac glycoside required for inhibition of the rat intestine being about 30 times higher than that required for inhibition of the guinea pig intestine. The range of potency of the different cardiac glycosides and aglycones which were tested in the low potassium. Tyrode solution, was the same for the two species. Presupposing an inhibition of Na+, K+-activated transport ATPases as the basic mechanism for the inhibition by cardiac glycosides of the isolated intestine preparations, a theory of qualitative differences between the transport enzymes in the two species is advanced. In the rat intestine the presence is suggested of one ATPase which is rather resistant to inhibition by cardiac glycosides, but sensitive to a reduction in potassium concentration, in addition to a glycoside-susceptible ATPase also present in the guinea pig intestine." @default.
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- W4300245722 date "2009-03-13" @default.
- W4300245722 modified "2023-09-26" @default.
- W4300245722 title "A Comparison of the Inhibition by Cardiac Glycosides of the Isolated Intestine from the Rat and the Guinea Pig" @default.
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- W4300245722 doi "https://doi.org/10.1111/j.1600-0773.1971.tb00612.x" @default.
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