Key result
Chronic hypertrophy from aortic stenosis and insufficiency in rats significantly lowered cardiac myofibrillar Ca2+ ATPase activity, despite normal myosin light chains and tropomyosin.
Why the study?
Does experimental heart failure produced by mechanical overloading alter cardiac myofibrillar ATPase activity and electrophoretic patterns in rats?
Does experimental heart failure produced by mechanical overloading alter cardiac myofibrillar ATPase activity and electrophoretic patterns in rats?
Experimental heart failure from mechanical overloading in rats is associated with reduced cardiac myofibrillar Ca2+ ATPase activity despite normal electrophoretic patterns of key contractile proteins.
Should not yet influence clinical decisions in heart failure; leaves open mechanistic roles in experimental overload models.
The specific activity of cardiac myofibrillar Ca2+ ATPase was significantly lowered in rats with chronic hypertrophy due to aortic stenosis and insufficiency. When studied in polyacrylamide gel electrophoresis, myosin light chains, tropomyosin, and calcium sensitizing factor were all normal.
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Berson et al. (1973) studied this question. Chronic hypertrophy from aortic stenosis and insufficiency in rats significantly lowered cardiac myofibrillar Ca2+ ATPase activity, despite normal myosin light chains and tropomyosin.
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