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Annual Review of Physiology

Volume 86, 2024

Regulating Striated Muscle Contraction: Through Thick and Thin

Abstract

Force generation in striated muscle is primarily controlled by structural changes in the actin-containing thin filaments triggered by an increase in intracellular calcium concentration. However, recent studies have elucidated a new class of regulatory mechanisms, based on the myosin-containing thick filament, that control the strength and speed of contraction by modulating the availability of myosin motors for the interaction with actin. This review summarizes the mechanisms of thin and thick filament activation that regulate the contractility of skeletal and cardiac muscle. A novel dual-filament paradigm of muscle regulation is emerging, in which the dynamics of force generation depends on the coordinated activation of thin and thick filaments. We highlight the interfilament signaling pathways based on titin and myosin-binding protein-C that couple thin and thick filament regulatory mechanisms. This dual-filament regulation mediates the length-dependent activation of cardiac muscle that underlies the control of the cardiac output in each heartbeat.

Keyword(s): cardiac muscle, length-dependent activation, muscle regulation, myosin, skeletal muscle, troponin
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2024-02-12
2024-05-04
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/content/journals/10.1146/annurev-physiol-042222-022728
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Regulating Striated Muscle Contraction: Through Thick and Thin
Annual Review of Physiology 86, 255 (2024); https://doi.org/10.1146/annurev-physiol-042222-022728
/content/journals/10.1146/annurev-physiol-042222-022728
/content/journals/10.1146/annurev-physiol-042222-022728
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