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• W2010167402 abstract "γ-Aminobutyric acid (GABA) provides a major synaptic input to GnRH neurons. GnRH neurons maintain high intracellular chloride levels and respond to exogenous GABA with depolarization and action potential firing. We examined the role of synaptic GABA type A receptor (GABAAR) activation on the firing activity of GnRH neurons. Targeted extracellular recordings were used to detect firing activity of GnRH neurons in brain slices from adult female mice. Because the brain slice preparation preserves both glutamatergic and GABAergic neuronal networks, the effects of GABAARs on GnRH neurons were isolated by blocking ionotropic glutamatergic receptors (iGluR). With iGluR blocked, many GnRH neurons remained spontaneously active. Consistent with an excitatory role for GABA, subsequent blockade of GABAARs suppressed the firing rate in active cells from diestrous females by approximately 40% (P &lt; 0.05; n = 10). GABAAR blockade did not affect inactive cells (n = 7), indicating that GABAAR-mediated inhibition was not responsible for the lack of firing. In prenatally androgenized females, GnRH neurons exhibit larger, more frequent GABAergic postsynaptic currents than control females. Most cells from prenatally androgenized animals fired spontaneously, and the firing rate was suppressed approximately 80% after GABAAR blockade (P &lt; 0.01; n = 8). Blocking GABAAR without blocking iGluRs increased the firing rate in GnRH neurons from diestrous females (P &lt; 0.05; n = 6), perhaps attributable to hyperexcitability within the slice network. Our results indicate that GABAergic inputs help generate a portion of action potentials in GnRH neurons; this fraction depends on the level of GABA transmission and postsynaptic responsiveness. The complexities of the GnRH neuron response to GABA make this a potentially critical integration point for central regulation of fertility." @default.
• W2010167402 created "2016-06-24" @default.
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• W2010167402 creator A5026534917 @default.
• W2010167402 date "2005-12-01" @default.
• W2010167402 modified "2023-10-16" @default.
• W2010167402 title "Endogenous γ-Aminobutyric Acid Can Excite Gonadotropin-Releasing Hormone Neurons" @default.
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• W2010167402 doi "https://doi.org/10.1210/en.2005-0788" @default.
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