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Fluid shear stress elicits endothelium-dependent vasodilatation via nitric oxide and prostacyclin-dependent and -independent mechanisms. The latter includes the opening of Ca(2+)-operated potassium channels by cytochrome P450 (CYP) epoxygenase-derived epoxyeicosatrienoic acids (EETs) leading to endothelial hyperpolarization. We previously reported that EETs activate the transient receptor potential (TRP) V4 channel in vascular endothelial cells and that Ca(2+) influx in these cells in response to mechanical stimuli is dependent on the activation of CYP epoxygenases. We therefore hypothesized that the TRPV4 channel is involved in the flow-induced vasodilatation attributed to the endothelium-derived hyperpolarizing factor (EDHF).

Role of cytochrome P450-dependent transient receptor potential V4 activation in flow-induced vasodilatation