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• W2129652011 startingPage "2965" @default.
• W2129652011 abstract "The release of GnRH evoked by norepinephrine (NE) was studied in GT1 GnRH neuronal cell lines in superfusion and static cultures. GnRH release from static cultured GT1-7 cells was stimulated by NE in a dose-dependent fashion. This effect was mimicked by the nonsubtype-selective beta-adrenergic agonist isoproterenol and blocked by the beta-adrenergic antagonist propranolol and the beta 1-adrenergic subtype-specific antagonist CGP 20712A. However, the stimulation of GnRH release by NE was not affected by the beta 2-, alpha-, alpha 1-, or alpha 2-adrenergic antagonists ICI 118.551, phentolamine, prazosin, or yohimbine, respectively. Superfusion of GT1-1 cells with NE for 60-100 min resulted in rapid and sustained increases in GnRH secretion. The NE-stimulated GnRH release showed a higher amplitude and longer duration than the spontaneous GnRH pulses characteristic of GT1-1 cells. In parallel to the stimulation of GnRH release, NE also rapidly increased (first observed at 60 sec) the intracellular concentration of cAMP in isobutylmethylxanthine-pretreated GT1-1 and GT1-7 cells in a dose-dependent fashion. The stimulation of intracellular cAMP concentration was also mimicked by isoproterenol and blocked by propranolol and CGP 20712A. In addition, GT1 cells express beta 1- but not beta 2-adrenergic receptor mRNA, as probed by Northern blot analysis. These results demonstrate a direct stimulatory effect of NE on GnRH neurons. The pharmacological evidence and the mRNA analysis are consistent with NE acting through a beta 1-adrenergic receptor positively coupled to adenylate cyclase." @default.
• W2129652011 created "2016-06-24" @default.
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• W2129652011 date "1992-12-01" @default.
• W2129652011 modified "2023-10-18" @default.
• W2129652011 title "Dopaminergic regulation of the GT1 gonadotropin-releasing hormone (GnRH) neuronal cell lines: stimulation of GnRH release via D1-receptors positively coupled to adenylate cyclase." @default.
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• W2129652011 doi "https://doi.org/10.1210/endo.131.6.1280208" @default.
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