Title : Role of brain thromboxane A2 in the release of noradrenaline and adrenaline from adrenal medulla in rats.

Pub. Date : 2003 Apr 25

PMID : 12706465






6 Functional Relationships(s)
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1 The present study was designed to characterize the source of plasma noradrenaline induced by centrally administered vasopressin and corticotropin-releasing hormone (CRH) in urethane-anesthetized rats. Norepinephrine arginine vasopressin Rattus norvegicus
2 Intracerebroventricularly administered vasopressin (0.2 nmol/animal) and CRH (1.5 nmol/animal) elevated plasma levels of noradrenaline and adrenaline. Norepinephrine arginine vasopressin Rattus norvegicus
3 Intracerebroventricularly administered indomethacin [1.2 micromol (500 microg)/animal] (an inhibitor of cyclooxygenase) abolished the elevations of both noradrenaline and adrenaline induced by vasopressin and CRH. Norepinephrine arginine vasopressin Rattus norvegicus
4 Intracerebroventricularly administered furegrelate [1.8 micromol (500 microg)/animal] (an inhibitor of thromboxane A(2) synthase) abolished the elevations of both noradrenaline and adrenaline induced by vasopressin, while the reagent only attenuated the elevation of plasma adrenaline evoked by CRH. Norepinephrine arginine vasopressin Rattus norvegicus
5 Acute bilateral adrenalectomy abolished the elevation of both noradrenaline and adrenaline induced by vasopressin, while the procedure reduced only the elevation of adrenaline induced by CRH. Norepinephrine arginine vasopressin Rattus norvegicus
6 The vasopressin-induced noradrenaline release from adrenal medulla is mediated by brain thromboxane A(2)-mediated mechanisms, while the CRH-induced noradrenaline release from sympathetic nerves is mediated by brain prostanoid (other than thromboxane A(2))-mediated mechanisms. Norepinephrine arginine vasopressin Rattus norvegicus