α1C (Cav1.2) L-type calcium channel mediates mechanosensitive calcium regulation

Greg L. Lyford, Peter R. Strege, Allan Shepard, Yijun Ou, Leonid Ermilov, Steven M. Miller, Simon J. Gibbons, James L. Rae, Joseph H. Szurszewski, Gianrico Farrugia

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

Smooth muscle exhibits mechanosensitivity independent of neural input, suggesting that mechanosensitive pathways reside within smooth muscle cells. The native L-type calcium current recorded from human intestinal smooth muscle is modulated by stretch. To define mechanosensitive mechanisms involved in the regulation of smooth muscle calcium entry, we cloned the α1C L-type calcium channel subunit (Cav1.2) from human intestinal smooth muscle and expressed the channel in a heterologous system. This channel subunit retained mechanosensitivity when expressed alone or coexpressed with a β2 calcium channel subunit in HEK-293 or Chinese hamster ovary cells. The heterologously expressed human cardiac α1C splice form also demonstrated mechanosensitivity. Inhibition of kinase signaling did not affect mechanosensitivity of the native channel. Truncation of the α1C COOH terminus, which contains an inhibitory domain and a proline-rich domain thought to mediate mechanosensitive signaling from integrins, did not disrupt mechanosensitivity of the expressed channel. These data demonstrate mechanical regulation of calcium entry through molecularly identified L-type calcium channels in mammalian cells and suggest that the mechanosensitivity resides within the pore forming α1C-subunit.

Original languageEnglish (US)
Pages (from-to)C1001-C1008
JournalAmerican Journal of Physiology - Cell Physiology
Volume283
Issue number3 52-3
DOIs
StatePublished - Sep 2002

Keywords

  • Mechanogated
  • Smooth muscle
  • Voltage gated

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

Fingerprint Dive into the research topics of 'α<sub>1C</sub> (Ca<sub>v</sub>1.2) L-type calcium channel mediates mechanosensitive calcium regulation'. Together they form a unique fingerprint.

  • Cite this

    Lyford, G. L., Strege, P. R., Shepard, A., Ou, Y., Ermilov, L., Miller, S. M., Gibbons, S. J., Rae, J. L., Szurszewski, J. H., & Farrugia, G. (2002). α1C (Cav1.2) L-type calcium channel mediates mechanosensitive calcium regulation. American Journal of Physiology - Cell Physiology, 283(3 52-3), C1001-C1008. https://doi.org/10.1152/ajpcell.00140.2002