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• W2128385806 abstract "Cytochrome P-450 (CYP) epoxygenases and their arachidonic acid (AA) metabolites, the epoxyeicosatrienoic acids (EETs), have been shown to produce increases in postischemic function via ATP-sensitive potassium channels (K ATP ); however, the direct effects of EETs on infarct size (IS) have not been investigated. We demonstrate that two major regioisomers of CYP epoxygenases, 11,12-EET and 14,15-EET, significantly reduced IS in dogs compared to control (22.1 ± 1.8%), whether administered 15 min before 60 min of coronary occlusion (6.4 ± 1.9%, 11,12-EET; and 8.4 ± 2.4%, 14.15-EET) or 5 min before 3 h of reperfusion (8.8 ± 2.1%, 11,12-EET; and 9.7 ± 1.4%, 14,15-EET). Pretreatment with the epoxide hydrolase metabolite of 14,15-EET, 14,15-dihydroxyeicosatrienoic acid, had no effect. The protective effect of 11,12-EET was abolished (24.3 ± 4.6%) by the K ATP channel antagonist glibenclamide. Furthermore, one 5-min period of ischemic preconditioning (IPC) reduced IS to a similar extent (8.7 ± 2.8%) to that observed with the EETs. The selective CYP epoxygenase inhibitor, N-methylsulfonyl-6-(2-propargyloxyphenyl)hexanamide (MS-PPOH), did not block the effect of IPC. However, administration of MS-PPOH concomitantly with N-methylsulfonyl-12,12-dibromododec-11-enanide (DDMS), a selective inhibitor of endogenous CYP ω-hydroxylases, abolished the reduction in myocardial IS expressed as a percentage of area at risk (IS/AAR) produced by DDMS (4.6 ± 1.2%, DDMS; and 22.2 ± 3.4%, MS-PPOH + DDMS). These data suggest that 11,12-EET and 14,15-EET produce reductions in IS/AAR primarily at reperfusion. Conversely, inhibition of CYP epoxygenases and endogenous EET formation by MS-PPOH, in the presence of the CYP ω-hydroxylase inhibitor DDMS blocked cardioprotection, which suggests that endogenous EETs are important for the beneficial effects observed when CYP ω-hydroxylases are inhibited. Finally, the protective effects of EETs are mediated by cardiac K ATP channels." @default.
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• W2128385806 date "2006-08-01" @default.
• W2128385806 modified "2023-09-24" @default.
• W2128385806 title "Epoxyeicosatrienoic acids in cardioprotection: ischemic versus reperfusion injury" @default.
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• W2128385806 doi "https://doi.org/10.1152/ajpheart.00071.2006" @default.
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