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• W2178375174 abstract "Basal contractility and responses to beta-adrenoceptor activation are compromised in hearts from rats with chronic portal vein stenosis. Here we report the effect of partial ligation of the portal vein on myocardial G protein expression, beta-adrenoceptor-G protein coupling, and excitation-contraction coupling (ECC). Contractility (dT/dt) was reduced 30-50% in right and left ventricles, but the rate of relaxation (-dT/dt) was unaffected. Isoproterenol-induced positive inotropism was diminished, but there was no difference in ED(50). The concentration-dependent increase in -dT/dt was unaffected. G(s)alpha and G(i)alpha expression, cholera toxin- and pertussis toxin-induced ADP-ribosylation, and formation of the agonist-receptor-G(s) complex were unaffected by portal vein stenosis. Of the components of ECC examined, the caffeine-sensitive sarcoplasmic reticulum Ca(2+) pool was reduced 35%, although the Ca(2+) uptake and release processes were unchanged; the apparent density of L-type Ca(2+) channels decreased 60% with no change in affinity; the dihydropyridine Ca(2+) channel agonist BAY K 8644 produced relative changes in dT/dt that were similar in both groups, suggesting normal function in the remaining Ca(2+) channels; and Na(+)/Ca(2+) exchange was reduced 50% in the portal vein stenosis group. These data suggest that the effect of portal vein stenosis on the myocardium is the result of alterations to ECC." @default.
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• W2178375174 date "2000-07-01" @default.
• W2178375174 modified "2023-10-06" @default.
• W2178375174 title "Cardiac excitation-contraction coupling in the portal hypertensive rat" @default.
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• W2178375174 doi "https://doi.org/10.1152/ajpgi.2000.279.1.g28" @default.
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