Abstract
We examined the putative functional role of the medial preoptic nucleusμ-receptor population in the expression of male copulatory behavior in sexually vigorous Long-Evans rats. In the first experiment, three doses of morphiceptin (10, 500, and 1000 ng) a selectiveμ-receptor agonist injected bilaterally into the medial preoptic nucleus, produced a marked delay in the initiation of male copulatory behavior compared to saline injected controls. These injections significantly lengthened intromission and mount latencies while having no appreciable effect on any other parameter of male copulatory behavior. In a separate experiment, the transient inhibition of the expression of male copulatory behavior was completely abolished following pretreatment of naloxone 20 minutes prior to bilateral injections of morphiceptin (1000 ng) into the medial preoptic nucleus. Collectively, these results suggest that the delay in the initiation of copulation that is commonly observed following peripheral or central injections of opioids is mediated at least in part byμ receptors located within the medial preoptic nucleus.
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Preliminary reports were given at the Society For Neuroscience, St Louis, and the Conference on Reproductive Behavior, Atlanta, in 1990
Winner of “Honorable Mention” in the 1990 National Honor Society in Psychology, (J.P. Guilford Undergraduate Research Award Competition
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Matuszewich, L., Dornan, W.A. Bilateral injections of a selectiveμ-receptor agonist (morphiceptin) into the medial preoptic nucleus produces a marked delay in the initiation of sexual behavior in the male rat. Psychopharmacology 106, 391–396 (1992). https://doi.org/10.1007/BF02245424
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DOI: https://doi.org/10.1007/BF02245424