Mechanism of the Frank-Starling law-A simulation study with a novel cardiac muscle contraction model that includes titin and troponin I

Natalie S. Schneider, Takao Shimayoshi, Akira Amano, Tetsuya Matsuda

研究成果: ジャーナルへの寄稿記事

17 引用 (Scopus)

抄録

A stretch-induced increase of active tension is one of the most important properties of the heart, known as the Frank-Starling law. Although a variation of myofilament Ca2+ sensitivity with sarcomere length (SL) change was found to be involved, the underlying molecular mechanisms are not fully clarified. Some recent experimental studies indicate that a reduction of the lattice spacing between thin and thick filaments, through the increase of passive tension caused by the sarcomeric protein titin with an increase in SL within the physiological range, promotes formation of force-generating crossbridges (Xbs). However, the mechanism by which the Xb concentration determines the degree of cooperativity for a given SL has so far evaded experimental elucidation. In this simulation study, a novel, rather simple molecular-based cardiac contraction model, appropriate for integration into a ventricular cell model, was designed, being the first model to introduce experimental data on titin-based radial tension to account for the SL-dependent modulation of the interfilament lattice spacing and to include a conformational change of troponin I (TnI). Simulation results for the isometric twitch contraction time course, the length-tension and the force-[Ca2+] relationships are comparable to experimental data. A complete potential Frank-Starling mechanism was analyzed by this simulation study. The SL-dependent modulation of the myosin binding rate through titin's passive tension determines the Xb concentration which then alters the degree of positive cooperativity affecting the rate of the TnI conformation change and causing the Hill coefficient to be SL-dependent.

元の言語英語
ページ(範囲)522-536
ページ数15
ジャーナルJournal of Molecular and Cellular Cardiology
41
発行部数3
DOI
出版物ステータス出版済み - 9 1 2006

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Connectin
Starlings
Sarcomeres
Troponin I
Muscle Contraction
Myocardium
Isometric Contraction
Myofibrils
Myosins

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cardiology and Cardiovascular Medicine

これを引用

Mechanism of the Frank-Starling law-A simulation study with a novel cardiac muscle contraction model that includes titin and troponin I. / Schneider, Natalie S.; Shimayoshi, Takao; Amano, Akira; Matsuda, Tetsuya.

:: Journal of Molecular and Cellular Cardiology, 巻 41, 番号 3, 01.09.2006, p. 522-536.

研究成果: ジャーナルへの寄稿記事

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