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- W2074803510 abstract "To test the hypothesis that the duration of melatonin secretion may be a critical parameter in the transduction of photoperiodic signals on prolactin and progesterone secretions, timed intravenous melatonin infusions were carried out in intact and ganglionectomized pregnant and pseudopregnant mink. To localize the target sites of melatonin, electrolytic lesions of hypothalamic nuclei were performed in females receiving melatonin infusions. As a control, the first experiment was designed to confirm that pineal denervation by bilateral ablation of the superior cervical ganglion rendered the pregnant mink totally unresponsive to the inhibitory effects of short days on progesterone secretion. In the following experiments, timed intravenous melatonin infusions were carried out in intact and ganglionectomized females from Day 12 to 32 of pregnancy or pseudopregnancy. Daily infusions of melatonin for 16 h in intact females or for 11 or 13 h in ganglionectomized females suppressed the rise in plasma prolactin and progesterone levels. In intact as in ganglionectomized females, daily infusions of melatonin for 9 h delayed the rise in plasma prolactin concentrations without affecting the secretion of progesterone. In ganglionectomized females, saline infusions for 13 h or melatonin infusions for 7h did not modify the secretions of prolactin and progesterone. In ganglionectomized females bearing lesions of the Suprachiasmatic nuclei or the retrochiasmatic area, melatonin infusions for 13 h were still able to inhibit prolactin and progesterone secretions. These results are consistent with the hypothesis postulating that the peak duration of melatonin secretion is a critical parameter for transducing photoperiodic responses in pregnant or pseudopregnant mink. Secondly, they suggest that the Suprachiasmatic nuclei and the retrochiasmatic area are not essential for the action of melatonin in the photoperiodic control of prolactin and progesterone secretions during pregnancy or pseudopregnancy in the mink." @default.
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- W2074803510 date "1990-10-01" @default.
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- W2074803510 title "Effects of Timed Melatonin Infusions and Lesions of the Suprachiasmatic Nuclei on Prolactin and Progesterone Secretions in Pregnant or Pseudopregnant Mink (Mustela vison)" @default.
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- W2074803510 doi "https://doi.org/10.1111/j.1365-2826.1990.tb00451.x" @default.
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