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• W2129668596 abstract "Epoxyeicosatrienoic acids (EETs), the cytochrome P-450 epoxygenase metabolites of arachidonic acid, are candidates of endothelium-derived hyperpolarizing factors. We have previously reported that EETs are potent activators of cardiac ATP-sensitive K + (K ATP ) channels, but their effects on the vascular K ATP channels are unknown. With the use of whole cell patch-clamp techniques with 0.1 mM ATP in the pipette and holding at −60 mV, freshly isolated smooth muscle cells from rat mesenteric arteries had small glibenclamide-sensitive currents at baseline (13.1 ± 3.9 pA, n = 5) that showed a 7.2-fold activation by 10 μM pinacidil (94.1 ± 21.9 pA, n = 7, P < 0.05). 11,12-EET dose dependently activated the K ATP current with an apparent EC 50 of 87 nM. Activation of the K ATP channels by 500 nM 11,12-EET was inhibited by inclusion of the PKA inhibitor peptide (5 μM) but not by the inclusion of the PKC inhibitor peptide (100 μM) in the pipette solution. These results were corroborated by vasoreactivity studies. 11,12-EET produced dose-dependent vasorelaxation in isolated small mesenteric arteries, and this effect was reduced by 50% with glibenclamide (1 μM) preincubation. The 11,12-EET effects on vasorelaxation were also significantly attenuated by preincubation with cell-permeant PKA inhibitor myristoylated PKI(14–22), and, in the presence of PKA inhibitor, glibenclamide had no additional effects. These results suggest that 11,12-EET is a potent activator of the vascular K ATP channels, and its effects are dependent on PKA activities." @default.
• W2129668596 created "2016-06-24" @default.
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• W2129668596 date "2005-01-01" @default.
• W2129668596 modified "2023-10-04" @default.
• W2129668596 title "Activation of rat mesenteric arterial K_ATP channels by 11,12-epoxyeicosatrienoic acid" @default.
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• W2129668596 doi "https://doi.org/10.1152/ajpheart.00423.2004" @default.
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