AUTHOR=Ishii Shuya , Oyama Kotaro , Shintani Seine A. , Kobirumaki-Shimozawa Fuyu , Ishiwata Shin’ichi , Fukuda Norio 

TITLE=Thermal Activation of Thin Filaments in Striated Muscle

JOURNAL=Frontiers in Physiology

VOLUME=Volume 11 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2020.00278

DOI=10.3389/fphys.2020.00278

ISSN=1664-042X

ABSTRACT=In skeletal and cardiac muscles, contraction is triggered by an increase in the intracellular Ca2+ concentration. During Ca2+ transients, Ca2+-binding to troponin C shifts the “on-off” equilibrium of the thin filament state toward the “on” sate, promoting actomyosin interaction. Likewise, recent studies have revealed that the thin filament state is under the influence of temperature; viz., an increase in temperature increases active force production. In this short review, we discuss the effects of temperature on the contractile performance of mammalian striated muscle at/around body temperature, focusing especially on the temperature-dependent shift of the “on-off” equilibrium of the thin filament state.