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- W2099173852 abstract "Perfusion of isolated rat heart with L-methionine produced a positive inotropic effect that was temporally preceded, as well as accompanied, by an increase of methyl group incorporation into N-methylated phospholipids of the myocardium. Maximal increase in contractile force development was associated with maximal methyl group incorporation. Both parameters showed a dose-related dependence on methionine and correlated positively (r = 0.965) upon regression analysis of the data. The presence of adenosine, L-homocysteine thiolactone and erythro-9-(2-hydroxy-3-nonyl) adenine in the perfusion medium inhibited the positive inotropic effect as well as the incorporation of methyl groups into phospholipids. Cycloleucine, an inhibitor of S-adenosylmethionine synthetase, also reduced the increase in contractility by methionine. Methionine-induced positive inotropic effect could be modulated by varying Ca2+ concentration in the perfusate and was inhibited by ryanodine, a blocker of sarcoplasmic reticular Ca2+ release. These observations indicate that L-methionine may serve as a powerful positive inotropic agent and suggest that phospholipid N-methylation plays an important role in functional activity of rat heart." @default.
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- W2099173852 title "Methionine-induced positive inotropic effect in rat heart: possible role of phospholipid N-methylation." @default.
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