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Administration of opioid receptor antagonists was utilized to determine the opioid receptor type involved in the suppression of LH release by beta-endorphin (beta-END). Long-term (three to four weeks) ovariectomized rats with chronic third ventricular cannulae were fitted with jugular catheters and received treatment with vehicle or one of three opioid antagonists. The delta antagonist ICI 154, 129, but not the mu1 or mu antagonists naloxazone or beta-funaltrexamine, respectively, blocked the suppressive effect of beta-END on plasma LH levels and transiently but significantly increased LH levels above preinfusion value. None of the antagonists significantly reduced the beta-END-induced release of PRL. These results provide evidence that the inhibitory effect of beta-END on LH release may be mediated by delta receptors.
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