L-type calcium channel modulates mechanosensitivity of the cardiomyocyte cell line H9c2

Ken Takahashi, Shogo Hayashi, Mari Miyajima, Marei Omori, Jing Wang, Keiko Kaihara, Masatoshi Morimatsu, Chen Wang, Jian Chen, Gentaro Iribe, Keiji Naruse, Masahiro Sokabe

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2 Citations (Scopus)

Abstract

The application of mechanical stimuli to cells often induce increases in intracellular calcium, affecting the regulation of a variety of cell functions. Although the mechanism of mechanotransduction-induced calcium increases has not been fully resolved, the involvement of mechanosensitive ion channels in the plasma membrane and the endoplasmic reticulum has been reported. Here, we demonstrate that voltage-gated L-type calcium channels play a critical role in the mechanosensitive calcium response in H9c2 rat cardiomyocytes. The intracellular calcium level in H9c2 cells increased in a reproducible dose-dependent manner in response to uniaxial stretching. The stretch-activated calcium response (SICR) completely disappeared in calcium-free medium, whereas thapsigargin and cyclopiazonic acid, inhibitors of sarcoendoplasmic reticulum calcium ATPase, partially reduced the SICR. These findings suggest that both calcium influx across the cell membrane and calcium release from the sarcoendoplasmic reticulum are involved in the SICR. Nifedipine, diltiazem, and verapamil, inhibitors of L-type calcium channels, reduced the SICR in a dose-dependent manner. Furthermore, small interfering RNA against the L-type calcium channel α1c subunit diminished the SICR dramatically. Nifedipine also diminished the mechanosensitivity of Langendorff-perfused rat heart. These results suggest that the SICR in H9c2 cardiomyocytes involves the activation of L-type calcium channels and subsequent calcium release from the sarcoendoplasmic reticulum.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalCell Calcium
Volume79
DOIs
Publication statusPublished - May 2019

Keywords

  • Calcium-induced calcium release
  • Cardiomyocyte
  • Mechanosensitivity
  • Voltage-gated calcium channel

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology

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    Takahashi, K., Hayashi, S., Miyajima, M., Omori, M., Wang, J., Kaihara, K., Morimatsu, M., Wang, C., Chen, J., Iribe, G., Naruse, K., & Sokabe, M. (2019). L-type calcium channel modulates mechanosensitivity of the cardiomyocyte cell line H9c2. Cell Calcium, 79, 68-74. https://doi.org/10.1016/j.ceca.2019.02.008