Novel role of transient receptor potential vanilloid 2 in the regulation of cardiac performance

Jack Rubinstein, Valerie M. Lasko, Sheryl E. Koch, Vivek P. Singh, Vinicius Carreira, Nathan Robbins, Amit R. Patel, Min Jiang, Philip Bidwell, Evangelia G. Kranias, W. Keith Jones, John N. Lorenz

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Transient receptor potential cation channels have been implicated in the regulation of cardiovascular function, but only recently has our laboratory described the vanilloid-2 subtype (TRPV2) in the cardiomyocyte, though its exact mechanism of action has not yet been established. This study tests the hypothesis that TRPV2 plays an important role in regulating myocyte contractility under physiological conditions. Therefore, we measured cardiac and vascular function in wild-type and TRPV2-/- mice in vitro and in vivo and found that TRPV2 deletion resulted in a decrease in basal systolic and diastolic function without affecting loading conditions or vascular tone. TRPV2 stimulation with probenecid, a relatively selective TRPV2 agonist, caused an increase in both inotropy and lusitropy in wild-type mice that was blunted in TRPV2-/- mice. We examined the mechanism of TRPV2 inotropy/lusitropy in isolated myocytes and found that it modulates Ca2+transients and sarcoplasmic reticulum Ca2+ loading. We show that the activity of this channel is necessary for normal cardiac function and that there is increased contractility in response to agonism of TRPV2 with probenecid.

Original languageEnglish (US)
Pages (from-to)H574-H584
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume306
Issue number4
DOIs
StatePublished - Feb 15 2014

Keywords

  • Blood flow
  • Blood pressure
  • Calcium
  • Cardiac myocytes
  • Contractility
  • Hemodynamics
  • Ion channels
  • Probenecid
  • Vascular resistance

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