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Eur J Pharmacol. 1980 Sep 5;66(4):375-8.

Evidence for a direct inhibitory effect of morphine on the secretion of posterior pituitary hormones.

Abstract

The effect of morphine and naloxone on vasopressin and oxytocin release from incubated neurointermediate lobe and pars nervosa of rat pituitaries were investigated. It was shown that morphine and endorphins blocked hormonal output and that this inhibitory action was reversed by naloxone. It is concluded that opiates exert a direct inhibitory influence on vasopressin and oxytocin secretions from the neurohypophysis.

PMID:
6252017
[PubMed - indexed for MEDLINE]
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