Journal
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
Volume 311, Issue 6, Pages H1437-H1444Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.00465.2016
Keywords
hydrogen sulfide; vasodilation; endothelium; TRPV4; BK channel
Funding
- National Heart, Lung, and Blood Institute [HL-82799, HL-007736, HL-123301]
- American Heart Association [12POST8690008, 15GRNT21080001]
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Hydrogen sulfide (H2S) is a recently described gaseous vasodilator produced within the vasculature by the enzymes cystathionine gamma-lyase and 3-mercaptopyruvate sulfurtransferase. Previous data demonstrate that endothelial cells (EC) are the source of endogenous H2S production and are required for H2S-induced dilation. However, the signal transduction pathway activated by H2S within EC has not been elucidated. TRPV4 and large-conductance Ca2+-activated K channels (BK channels) are expressed in EC. H2S-induced dilation is inhibited by luminal administration of iberiotoxin and disruption of the endothelium. Calcium influx through TRPV4 may activate these endothelial BK channels (eBK). We hypothesized that H2S-mediated vasodilation involves activation of TRPV4 within the endothelium. In pressurized, phenylephrine-constricted mesenteric arteries, H2S elicited a dose-dependent vasodilation blocked by inhibition of TRPV4 channels (GSK2193874A, 300 nM). H2S (1 mu M) increased TRPV4-dependent (1.8-fold) localized calcium events in EC of pressurized arteries loaded with fluo-4 and Oregon Green. In pressurized EC tubes, H2S (1 mu M) and the TRPV4 activator, GSK101679A (30 nM), increased calcium events 1.8-and 1.5-fold, respectively. H2S-induced an iberiotoxin-sensitive outward current measured using whole cell patchclamp techniques in freshly dispersed EC. H2S increased K+ currents from 10 to 30 pA/pF at + 150 mV. Treatment with Na2S increased the level of sulfhydration of TRPV4 channels in aortic ECs. These results demonstrate that H2S-mediated vasodilation involves activation of TRPV4-dependent Ca2+ influx and BK channel activation within EC. Activation of TRPV4 channels appears to cause calcium events that result in the opening of eBK channels, endothelial hyperpolarization, and subsequent vasodilation.
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