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• W2912653951 abstract "The effects on the vasculature produced by ethanol withdrawal include both vasodilatation and hypocontractility, although a detailed biochemical understanding of these processes is yet to be accomplished. Here, we sought to investigate some of the mechanisms underlying vascular hypocontractility induced by ethanol withdrawal. Male Wistar rats were treated with increasing doses of 3–9% ethanol (v/v) for 21 days and the impact of ethanol withdrawal on the vascular function was assessed 48 h after immediate ethanol suspension. Endothelium-denuded rat aortic rings showed a reduced contractile response to phenylephrine, angiotensin II, serotonin and KCl after ethanol withdrawal, but the same phenomenon was not observed in endothelium-intact rings. Indomethacin, but not L-NAME, tiron, PEG-catalase and SC560, restored the contractile response to phenylephrine of endothelium-denuded aortas from abstinent rats. Hyporeactivity to phenylephrine induced by ethanol withdrawal was reversed by SC236, a selective cyclooxygenase (COX)-2 inhibitor. Similarly, Ro1138452, a selective prostacyclin IP receptor antagonist, reversed vascular hypocontractility induced by ethanol withdrawal. Increased concentrations of 6-keto-prostaglandin (PG)F1α, a stable product of PGI2, was detected in endothelium-denuded aortas from abstinent rats, and this response was prevented by indomethacin. However, no changes in aortic PGE2 levels were detected after ethanol withdrawal. In situ quantification of hydrogen peroxide (H2O2) and nitric oxide (NO) using fluorescent dyes revealed that ethanol withdrawal decreased the levels of these two compounds in the tunica media. Our studies show that the vascular hypocontractility induced by ethanol withdrawal is independent of the endothelium and it is mediated by PGI2 derived from COX-2." @default.
• W2912653951 created "2019-02-21" @default.
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• W2912653951 date "2019-03-01" @default.
• W2912653951 modified "2023-10-18" @default.
• W2912653951 title "Mechanisms underlying vascular hypocontractility induced by ethanol withdrawal: Role of cyclooxygenase 2-derived prostacyclin" @default.
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• W2912653951 doi "https://doi.org/10.1016/j.ejphar.2019.01.055" @default.
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