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The FASEB Journal, Vol 2, 2874-2877, Copyright © 1988 by The Federation of American Societies for Experimental Biology

RESEARCH COMMUNICATIONS

Opioid components of the clockwork that governs luteinizing hormone and prolactin release in male rats

OF Almeida, KE Nikolarakis, GE Webley and A Herz
Department of Neuropharmacology, Max Planck Institute for Psychiatry, Martinsried, Federal Republic of Germany.

Daily rhythms of secretion have been described for luteinizing hormone (LH) and prolactin (PRL) from the anterior pituitary of rats. Using selective opioid antagonists, we found that mu and kappa opioid receptor ligands regulate LH and PRL secretion and, of particular interest, that the magnitude of opioidergic effects varies with the time of day. In addition, incomplete temporal overlapping of the LH and PRL responses to the antagonists suggests that different endogenous opioid pathways, with different temporal profiles of peptide release, may control each of these hormones.




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Copyright © 1988 by The Federation of American Societies for Experimental Biology.