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- W2180927634 abstract "Epoxyeicosatrienoic acids (EETs) are released from endothelial cells and potently dilate small arteries by hyperpolarizing vascular myocytes. In the present study, we investigated the structural specificity of EETs in dilating canine and porcine coronary microvessels (50–140 μm ID) and activating large-conductance Ca 2+ -activated K + (BK Ca ) channels. The potencies and efficacies of EET regioisomers and enantiomers were compared with those of two EET homologs: epoxyeicosaquatraenoic acids (EEQs), which are made from eicosapentaenoic acid by the same cytochrome P-450 epoxygenase that generates EETs from arachidonic acid, and epoxydocosatetraenoic acids (EDTs), which are EETs that are two carbons longer. With EC 50 values of 3–120 pM but without regio- or stereoselectivity, EETs potently dilated canine and porcine microvessels. Surprisingly, the EEQs and EDTs had comparable potencies and efficacies in dilating microvessels. Moreover, 50 nM 13,14-EDT activated the BK Ca channels with the same efficacy as either 11,12-EET enantiomer at 50 nM. We conclude that coronary microvessels and BK Ca channels possess low structural specificity for EETs and suggest that EEQs and EDTs may thereby also be endothelium-derived hyperpolarizing factors." @default.
- W2180927634 created "2016-06-24" @default.
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- W2180927634 date "2001-06-01" @default.
- W2180927634 modified "2023-10-16" @default.
- W2180927634 title "EET homologs potently dilate coronary microvessels and activate BK<sub>Ca</sub>channels" @default.
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- W2180927634 doi "https://doi.org/10.1152/ajpheart.2001.280.6.h2430" @default.
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