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- W1192584645 abstract "Transient receptor potential vanilloid 4 (TRPV4) calcium channels are known to promote endothelium-dependent relaxation of mouse mesenteric arteries but TRPV4's role in the pulmonary vasculature is uncertain. Thus, we characterized TRPV4 channel vascular tone regulation in mouse main pulmonary artery rings and in the isolated perfused pulmonary circulation and studied possible mechanisms behind these characterizations.Using myography and a TRPV4 specific agonist GSK1016790A in a C57BL/6 WT mouse model of isolated constant-flow lung perfusion, we studied vascular tone regulation in arterial rings from the main left and right pulmonary arteries and vascular resistance of the intra-pulmonary circulation beyond the second branches of the pulmonary arteries. Removal of the endothelium confirmed endothelial dependence. GSK1016790A relaxed the main pulmonary artery (EC50 4 × 10(-8)mol/L), which was inhibited by removal of the endothelium from main pulmonary artery rings. GSK1016790A significantly increased vascular resistance of the pulmonary circulation in isolated perfused lungs, but these effects were inhibited by a TRPV4 antagonist AB159908. A nitric oxide inhibitor NG-nitro-L-arginine methyl ester (L-NAME) and K(+) channel blockers apamin plus charybdotoxin (ChTx) significantly inhibited GSK1016790A in the main pulmonary artery and in an isolated perfused lung in vitro.Activated TRPV4 channels increase pulmonary vascular resistance and vasodilate the main pulmonary artery." @default.
- W1192584645 created "2016-06-24" @default.
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- W1192584645 date "2015-12-01" @default.
- W1192584645 modified "2023-10-15" @default.
- W1192584645 title "Opposing actions of TRPV4 channel activation in the lung vasculature" @default.
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- W1192584645 doi "https://doi.org/10.1016/j.resp.2015.08.003" @default.
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