PMID: 2501000May 29, 1989Paper

Release of luteinizing hormone-releasing hormone: interrelations between eicosanoids and catecholamines

Brain Research
M SaadiF Dray

Abstract

The in vitro release of luteinizing hormone-releasing hormone (LHRH), prostaglandin (PG) E2 and leukotriene (LT) C4 from male rat median eminences (ME), was estimated by radioimmunoassay (RIA) in the presence of the catecholamines (CA), norepinephrine (NE) and dopamine (DA). NE increased the release of PGE2 in the presence and in the absence of the Ca2+ ionophore A23187 (5 x 10(-6) M), but it did not modify the A23187-induced release of LTC4 from endogenous precursors or radiolabelled arachidonic acid. DA also stimulated the A23187-induced release of PGE2 but inhibited that of LTC4. However, while NE increased both the basal and the A23187-induced release of LHRH, DA increased the basal release of LHRH and inhibited the A23187-induced LHRH release. Exogenous LTC4 cancelled the inhibitory effect of DA on LHRH release. Blockade of dopaminergic receptors with haloperidol suppressed the effects of DA on PGE2, LTC4 and LHRH release. Neither eicosanoid affected the K+-evoked [3H]DA release, whereas only PGE2 inhibited the K+-evoked [3H]NE release. We conclude that LTC4 does not interact with the noradrenergic pathway and that the stimulatory effect of both catecholamines on LHRH release involves PGE2, but the inhibitory effect of DA ...Continue Reading

References

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Mar 14, 1989·European Journal of Pharmacology·A WisnerF Dray
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Aug 1, 1984·Proceedings of the National Academy of Sciences of the United States of America·S Kokubun, H Reuter

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Citations

Jul 1, 1990·Journal of Neurochemistry·T Shimizu, L S Wolfe
Jan 31, 2014·The Journal of Clinical Endocrinology and Metabolism·S Salian-MehtaM E Wierman

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