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- W2025621818 abstract "Gonadotropin-releasing hormone (GnRH) neurons in the terminal nerve (TN) show endogenous pacemaker activity, which is suggested to be dependent on the physiological conditions of the animal. The TN-GnRH neurons have been suggested to function as a neuromodulatory neuron that regulates long-lasting changes in the animal behavior. It has been reported that the TN-GnRH neurons are immunoreactive to FMRFamide. Here, we find that the pacemaker activity of TN-GnRH neuron is inhibited by FMRFamide: bath application of FMRFamide decreased the frequency of pacemaker activity of TN-GnRH neurons in a dose-dependent manner. This decrease was suppressed by a blockage of G protein–coupled receptor pathway by GDP-β-S. In addition, FMRFamide induced an increase in the membrane conductance, and the reversal potential for the FMRFamide-induced current changed according to the changes in [K + ] out as predicted from the Nernst equation for K + . We performed cloning and sequence analysis of the PQRFamide (NPFF/NPAF) gene in the dwarf gourami and found evidence to suggest that FMRFamide-like peptide in TN-GnRH neurons of the dwarf gourami is NPFF. NPFF actually inhibited the pacemaker activity of TN-GnRH neurons, and this inhibition was blocked by RF9, a potent and selective antagonist for mammalian NPFF receptors. These results suggest that the activation of K + conductance by FMRFamide-like peptide (≈NPFF) released from TN-GnRH neurons themselves causes the hyperpolarization and then inhibition of pacemaker activity in TN-GnRH neurons. Because TN-GnRH neurons make tight cell clusters in the brain, it is possible that FMRFamide-like peptides released from TN-GnRH neurons negatively regulates the activities of their own (autocrine) and/or neighboring neurons (paracrine)." @default.
- W2025621818 created "2016-06-24" @default.
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- W2025621818 date "2010-12-01" @default.
- W2025621818 modified "2023-09-26" @default.
- W2025621818 title "Electrophysiological Analysis of the Inhibitory Effects of FMRFamide-Like Peptides on the Pacemaker Activity of Gonadotropin-Releasing Hormone Neurons" @default.
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- W2025621818 doi "https://doi.org/10.1152/jn.01027.2009" @default.
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