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Arachidonic acid (AA) stimulates the in vitro release of somatostatin (SRIF) from the hypothalamic median eminence (ME). This effect is inhibited by 5, 8, 11, 14-eicosatetraynoic acid (ETYA) but not by indomethacin (ID). Microsomal fractions from the rat hypothalamus catalyze an NADPH-dependent metabolism of AA to form several oxygenated products of which the major metabolites are 5, 6-epoxyeicosatrienoic acid (5, 6-EET) and its hydration product, 5, 6-dihydroxyeicosatrienoic acid (5, 6-DHET). Both novel arachidonate metabolites, particularly 5, 6-EET, are potent in vitro stimuli for the release of SRIF. To a lesser extent, 5, 6-EET is also capable of evoking luteinizing hormone-releasing hormone (LHRH) release. The results suggest that these "epoxygenase" metabolites of AA may be physiologically involved in the control of SRIF release.
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