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• W1965241992 abstract "The luteinizing hormone surge in the female rat is the result of the integration of multiple signals within the medial preoptic area. The medial preoptic area contains gonadotropin-releasing hormone neurons that are responsible for the release of luteinizing hormone, neurons containing estrogen receptors and terminals originating from the suprachiasmatic nucleus with, for example, vasopressin as neurotransmitter. Both the medial preoptic area and suprachiasmatic nucleus are crucial for the occurrence of luteinizing hormone surges, since lesioning of either nucleus prevents pre-ovulatory and steroid-induced luteinizing hormone surges. In this study, we investigated whether vasopressin in the medial preoptic area could be the daily neuronal signal from the suprachiasmatic nucleus responsible for the timing of the luteinizing hormone surge. Vasopressin (50 ng/microl) or Ringer solution was administered by reverse microdialysis from Zeitgeber times 7.5 to 12.5 into the medial preoptic area of ovariectomized, estradiol-treated rats. The suprachiasmatic nucleus was lesioned to remove all cyclic luteinizing hormone secretion. This was evaluated by monitoring behavioral activity; animals that were arrhythmic were included in the experiments. Hourly blood samples were taken to measure plasma luteinizing hormone levels. Preoptic vasopressin administration induced a surge-like luteinizing hormone pattern in suprachiasmatic nucleus-lesioned animals, whereas constant, basal luteinizing hormone levels were found in the control animals. These data show that vasopressin, by itself, is able to trigger the luteinizing hormone surge in suprachiasmatic nucleus-lesioned rats. We propose that vasopressin is a timing signal from the suprachiasmatic nucleus responsible for the activation of the hypothalamo-pituitary-gonadal axis in the female rat." @default.
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• W1965241992 date "1999-07-01" @default.
• W1965241992 modified "2023-10-16" @default.
• W1965241992 title "Vasopressin induces a luteinizing hormone surge in ovariectomized, estradiol-treated rats with lesions of the suprachiasmatic nucleus" @default.
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• W1965241992 doi "https://doi.org/10.1016/s0306-4522(99)00106-2" @default.
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