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Central injection of neuropeptide B induces luteinizing hormone release in male and female rats. | LitMetric
Neuropeptide B (NPB) has been identified as an endogenous peptide ligand for the orphan receptor NPBWR1. However, the effect of NPB on the central regulatory mechanisms of reproductive functions remains unclear. Our findings indicated the presence of Npb, Npw (which is another ligand for NPBWR1), and Npbwr1 mRNA in the hypothalamus of male and female rats at each stage of the estrous cycle. Npb mRNA expression was found to be significantly higher in diestrus compared to estrus. The expression of Npw mRNA was one order of magnitude lower than that of Npb mRNA, and Npw mRNA expression in diestrus was significantly higher than that in the other stages of the estrous cycle. Furthermore, Npbwr1 mRNA expression was found to be significantly higher in diestrus compared to the other stages of the estrous cycle and intact males. Notably, estrogen did not alter the expression of Npb, Npw, and Npbwr1 mRNAs in the hypothalamus of females. Central injection of NPB increased plasma luteinizing hormone (LH) levels in both intact males and estrogen-primed ovariectomized females but not in ovariectomized females. These results suggest that NPB-NPBWR1 signaling would be a facilitatory regulatory mechanism in the reproductive function of male and female rats. To the best of our knowledge, this study is the first report to describe the central role of NPB-NPBWR1 signaling in LH regulation in mammals.
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