PMID: 157709Jan 1, 1979Paper

Hereditary and acquired cardiomyopathies in experimental animals: mechanical, biochemical, and structural features

Annals of the New York Academy of Sciences
J E StrobeckE H Sonnenblick

Abstract

Evidence has been presented regarding alterations of contractile behavior muscle biochemistry, and ulstrastructure during the course of the hereditary hamster cardiomyopathy. Also, preliminary structural and mechanical data were presented on the acquired cardiomyopathy of diabetes mellitus in experimental animals. In the hamster model, contractile performance, measured as isometric tension and rate of tension development, was shown to be depressed throughout the course of the disease, whereas normalized force-velocity relationships returned to normal only during the compensated stages of hypertrophy. Force-frequency relationships were depressed in myopathic muscles, indicating the presence of alterations in the muscle activation system, namely, the biochemical and functional integrity of the sarcoplasmic reticulum. Analysis of the contractile proteins in myopathic muscle has revealed depressions of Ca2+ activity in purified myosin in addition to an independently increased neutral protease activity that results in the specific degradation of LC2 of myosin. Sympathetic time and norepinephrine turnover increase progressively during the course of the disease. These changes are accompanied by decreasing tissue levels of neorepinephr...Continue Reading

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Related Concepts

Actomyosin
DNA-dependent ATPase
Contractile Proteins
Streptozotocin Diabetes
Microangiopathy, Diabetic
Cricetus
Heart
Hypertensive Disease
Myocardial Contraction
Cardiomyopathies

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