What is the clinical evidence from this study?

Intervention: Thyroxine and propylthiouracil treatment. Primary outcome: Reactivity of ventricular muscle fibers to anti-bovine atrial myosin.

What question did this study set out to answer?

The study aims to investigate the different myosin types and fiber types present in ventricular myocardium, particularly under the influence of thyroid hormones.

January 1, 1981The Journal of Cell BiologyOpen Access

Myosin types and fiber types in cardiac muscle. I. Ventricular myocardium.

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Key result

Ventricular muscle fibers in rabbit hearts became strongly reactive to anti-bovine atrial myosin after thyroxine treatment and unreactive after propylthiouracil treatment.

Key Points

The study aims to investigate the different myosin types and fiber types present in ventricular myocardium, particularly under the influence of thyroid hormones.
Produced and purified specific antibodies against bovine atrial myosin using affinity chromatography.
Conducted enzyme immunoassays and SDS-gel electrophoresis to determine myosin reactivity in cardiac fibers.
Examined reactivity in rabbit hearts to assess differences in myosin types and fiber distribution.
Anti-bAm antibodies stained all atrial muscle fibers and some ventricular fibers in the right ventricle, but most left ventricle fibers were unreactive.
Thyroxine treatment resulted in strong reactivity of all ventricular fibers, while propylthiouracil treatment led to reduced reactivity.
Findings suggest the presence of different ventricular isomyosins that contribute to variations in myosin ATPase activity and contraction velocity.

Structured PICO

Population

Bovine and rabbit hearts (ventricular myocardium)

Intervention

Thyroxine treatment (in rabbits)

Comparator

Propylthiouracil treatment (in rabbits) or normal state

Outcome

Reactivity of ventricular muscle fibers to anti-bovine atrial myosin (anti-bAm) antibodiessurrogate

Ventricular isomyosin composition varies according to thyroid state, suggesting that fiber types with different contractile properties coexist in the ventricular myocardium.

Discussion

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Implication

Thyroid state modulates rabbit ventricular myosin; hypothesis-generating for fiber heterogeneity and leaves open human contractile or therapeutic relevance.

Cite This Study

Sartore et al. (1981) studied this question. Thyroxine and propylthiouracil treatment was evaluated on Reactivity of ventricular muscle fibers to anti-bovine atrial myosin. Ventricular muscle fibers in rabbit hearts became strongly reactive to anti-bovine atrial myosin after thyroxine treatment and unreactive after propylthiouracil treatment.

synapsesocial.com/papers/6a6a96f7c068f641bcf40862 https://doi.org/10.1083/jcb.88.1.226

View Full Paper

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Implication

Thyroid state modulates rabbit ventricular myosin; hypothesis-generating for fiber heterogeneity and leaves open human contractile or therapeutic relevance.

Myosin types and fiber types in cardiac muscle. I. Ventricular myocardium.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Myosin types and fiber types in cardiac muscle. I. Ventricular myocardium.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider