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- W2016060688 abstract "Left ventricular myosin ATPase activity, expressed as enzymatic Vmax values, was analyzed in dogs subjected to severe left ventricular pressure overload (aortic stenosis). K+ and Ca2+ activated myosin ATPase activities in the left ventricle (LV) were significantly depressed (P < .01) in the experimental animals. For normal K+ activated myosin the Vmax values in micromoles of Pi per mg per min were: right ventricle 2.10; left ventricle, 2.84. For Ca2+ activated myosin the Vmax values were: right ventricle, 0.77; left ventricle 0.97, when assayed at 37°C. Myosin enzymatic activity in the left ventricle progressively declined following severe aortic banding, reaching a value similar to that observed for normal right ventricular myosin; NH4+ activated left ventricular myosin ATPase activity remained unchanged (7.20 ± 0.4 μmol PO4/mg.min). Left ventricular myosin from the hearts subject to severe stress simulated normal right ventricular myosin in ATPase activity, chain proportions and degree of calcium binding, Normal left ventricular myosin contained approximately 10% of the myosin protein concentration in the light chains; myosin from the left ventricles of the hemodynamically overloaded hearts contained 20% of the myosin protein concentration in the light chains (P < .001). With only one of the myosin light chains binding calcium left ventricular myosin from the stressed hypertrophied tissue bound approximately 2 mol Ca2+ mol−1 myosin similar to myosin of the normal right ventricle; normal left ventricular myosin bound approximately 1 mol of Ca2+ mol−1 myosin." @default.
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- W2016060688 date "1976-04-01" @default.
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- W2016060688 title "Effects of severe hemodynamic pressure overload on the properties of canine left ventricular myosin: Mechanism by which myosin ATPase activity is lowered during chronic increased hemodynamic stress" @default.
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- W2016060688 doi "https://doi.org/10.1016/0022-2828(76)90002-x" @default.
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