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• W1963524554 abstract "Previous work showed that rabbit aorta metabolizes arachidonic acid via 15-lipoxygenase to 15-hydroperoxyeicosatetraenoic acid (15-HPETE), which undergoes an enzymatic rearrangement to 11-hydroxy-14,15-epoxyeicosatrienoic acid (11-H-14,15-EETA) and 15-hydroxy-11,12-epoxyeicosatrienoic acid (15-H-11,12-EETA). Hydrolysis of the epoxy group results in the formation of 11,14,15- and 11,12,15-trihydroxyeicosatrienoic acids (THETAs). Endothelial cells have several heme-containing enzymes including cytochromes P450 (CYP), nitric oxide synthase (eNOS), and prostacyclin (PGI(2)) synthase that catalyze the rearrangement of 15-HPETE to HEETAs. Incubation of arachidonic acid and 15-lipoxygenase, or 15-HPETE with rabbit aortic microsomes or rat liver microsomes, a rich source of CYP, resulted in the formation of a product that comigrated with THETAs and HEETAs on HPLC. Immunoblot analysis showed the presence of CYP2C8 and CYP2J2 in aortic tissue and when CYP2J2 or CYP2C8 was incubated with arachidonic acid and 15-lipoxygenase, the major products were 11,12,15- and 11,14,15-THETAs. Incubation of purified hematin, CYP2C11, eNOS or PGI(2) synthase enzymes with arachidonic acid and 15-lipoxygenase produced a different pattern of metabolites from rabbit aortic microsomes. Clotrimazole, a non-specific CYP inhibitor, and ebastine and terfenadone, specific CYP2J2 inhibitors, blocked the ability of aortic microsomes to produce THETAs while specific inhibitors of PGI(2) synthase, eNOS or CYP2C8/2C9 had no effect on THETA production. We suggest that a CYP, possibly CYP2J2, may function as the hydroperoxide isomerase converting 15-HPETE to HEETAs in rabbit vascular tissue. Further hydrolysis of the epoxy group of the HEETAs results in the formation of 11,12,15- and 11,14,15-THETAs. The HEETAs and THETAs are both vasodilators and may function as important regulators of vascular tone." @default.
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• W1963524554 date "2003-12-01" @default.
• W1963524554 modified "2023-10-17" @default.
• W1963524554 title "Rabbit aorta converts 15-HPETE to trihydroxyeicosatrienoic acids: potential role of cytochrome P450" @default.
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• W1963524554 doi "https://doi.org/10.1016/j.abb.2003.09.026" @default.
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