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- W1993404169 abstract "The metabolism of arachidonic acid (AA) into vasoactive products by cyclooxygenase and lipoxygenase enzymes has been well described, as has their biological relevance. Recently, a number of studies have demonstrated the ability of cytochrome P-450 (P450) enzymes to metabolize AA into biologically important regulators of vascular tone. There are two categories of vasoactive P450 metabolites, namely those catalyzed by epoxygenase enzymes which generate epoxyeicosatrienoic acids (EETs) and those enzymes which generate hydroxyeicosatetraenoic acids (HETEs). Except for 20-HETE, P450 metabolites of AA occur as stereo- and regioisomers which determine, to some extent, their biological activity. 5, 6-, 8, 9-, 11, 12- and 14, 15-EETs are generally potent dilators in a number of vascular beds with a sensitivity which appears to increase as the vasculature decreases in size toward capillaries. HETEs, such as 12R- and 20-HETE, can be potent activators of vascular tissue with 20-HETE contracting cerebral and renal microvessels at concentrations of < 10-10M. Both EETs and HETEs can be made by vascular and extravascular tissue. Available data suggests that EETs are formed by endothelial and parenchymal tissue while HETEs can be endogenously formed in arterial muscle where they appear to act as second messengers. This review will discuss the molecular biology, stereochemistry, biological activity and importance of P450 metabolites of AA as para- and autocrine controllers of organ blood flow. We will also discuss the large diversity of P450 enzyme isoforms and how such diversity can provide for precise physiological control of vascular tone." @default.
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- W1993404169 date "1995-01-01" @default.
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- W1993404169 title "Role of Cytochrome P-450 Enzymes and Metabolites of Arachidonic Acid in the Control of Vascular Tone" @default.
- W1993404169 doi "https://doi.org/10.1159/000159080" @default.
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