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


Authors: Rubinstein, J.; Lasko, V. M.; Koch, S. E.; Singh, V. P.; Carreira, V.; Robbins, N.; Patel, A. R.; Jiang, M.; Bidwell, P.; Kranias, E. G.; Jones, W. K.; Lorenz, J. N.
Article Title: Novel role of transient receptor potential vanilloid 2 in the regulation of cardiac performance
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 Ca(2+) transients and sarcoplasmic reticulum Ca(2+) 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.
Journal Title: American Journal of Physiology - Heart Circulatory Physiology
Volume: 306
Issue: 4
ISSN: 0363-6135
Publisher: Unknown  
Journal Place: United States
Date Published: 2014
Start Page: H574
End Page: 84
Language: eng
DOI/URL:
Notes: LR: 20140508; GR: HL-64018/HL/NHLBI NIH HHS/United States; GR: R01 HL026057/HL/NHLBI NIH HHS/United States; JID: 100901228; 0 (Calcium Channels); 0 (TRPV Cation Channels); 0 (Trpv2 protein, mouse); 0 (Uricosuric Agents); PO572Z7917 (Probenecid); OID: NLM: PMC3920243 [Available on 02/15/15]; OTO: NOTNLM; PMCR: 2015/02/15 00:00; 2013/12/06 [aheadofprint]; ppublish