Cardiac thin filament regulation and the Frank-Starling mechanism

Fuyu Kobirumaki-Shimozawa, Takahiro Inoue, Seine A. Shintani, Kotaro Oyama, Takako Terui, Susumu Minamisawa, Shin'ichi Ishiwata, Norio Fukuda*

*この研究の対応する著者

    研究成果: Article査読

    52 被引用数 (Scopus)

    抄録

    The heart has an intrinsic ability to increase systolic force in response to a rise in ventricular filling (the Frank-Starling law of the heart). It is widely accepted that the length dependence of myocardial activation underlies the Frank-Starling law of the heart. Recent advances in muscle physiology have enabled the identification of the factors involved in length-dependent activation, viz., titin (connectin)-based interfilament lattice spacing reduction and thin filament "on-off" regulation, with the former triggering length-dependent activation and the latter determining the number of myosin molecules recruited to thin filaments. Patients with a failing heart have demonstrated reduced exercise tolerance at least in part via depression of the Frank-Starling mechanism. Recent studies revealed that various mutations occur in the thin filament regulatory proteins, such as troponin, in the ventricular muscle of failing hearts, which consequently alter the Frank-Starling mechanism. In this article, we review the molecular mechanisms of length-dependent activation, and the influence of troponin mutations on the phenomenon.

    本文言語English
    ページ(範囲)221-232
    ページ数12
    ジャーナルJournal of Physiological Sciences
    64
    4
    DOI
    出版ステータスPublished - 2014

    ASJC Scopus subject areas

    • 生理学

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