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• W2001556875 abstract "The fact that opiates elicit prolactin secretion is well known. However, we have recently discovered that morphine does not stimulate prolactin release in lactating rats. The physiological basis for this alteration in opiate sensitivity during lactation is not known. Since morphine-induced prolactin secretion in male rats is mediated via the mu opioid receptor subtype, one possible explanation is that mu receptors are down-regulated during lactation. To address this possibility, the effects of mu opioid peptides on prolactin secretion were examined in lactating rats. The presumed mu-selective peptides DAGO ([D-Ala2, Me-Phe4, Gly-ol5]-enkephalin) and PLO-17 ([NMe-Phe3, D-Pro4]-morphiceptin) were administered to primiparous lactating rats and the resulting hormone responses measured. Both DAGO and PLO-17 caused a rapid and significant rise in plasma prolactin during lactation. The prolactin-releasing effects of both peptides were naloxone reversible, suggesting involvement of opioid receptors. Moreover, the DAGO-induced secretion of prolactin could be completely abolished by pretreatment with the irreversible mu antagonist β-funaltrexamine. In lactating rats, DAGO and PLO-17 were poor growth hormone-releasing agents, providing further evidence for the mu specificity of these peptides. These results imply that during lactation, as in other reproductive states, mu opioid receptor sites are positively coupled to the prolactin secretory mechanism. Thus, the previously observed inability of morphine to elicit prolactin release in lactating rats cannot be explained on the basis of down-regulation of mu opioid receptors." @default.
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• W2001556875 date "1990-06-01" @default.
• W2001556875 modified "2023-10-16" @default.
• W2001556875 title "Mu-Selective Opioid Peptides Stimulate Prolactin Release in Lactating Rats" @default.
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• W2001556875 doi "https://doi.org/10.1111/j.1365-2826.1990.tb00404.x" @default.
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