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Maintenance of a low intraneuronal Cl - concentration, [Cl - ] i , is critical for inhibition in the CNS. Here, the contribution of passive, conductive Cl - flux to recovery of [Cl - ] i after a high load was analyzed in mature central neurons from rat. A novel method for quantifying the resting Cl - conductance, important for [Cl - ] i recovery, was developed and the possible contribution of GABA A and glycine receptors and of ClC-2 channels to this conductance was analyzed. The hypothesis that spontaneous, action potential-independent release of GABA is important for [Cl - ] i recovery was tested. [Cl - ] i was examined by gramicidin-perforated patch recordings in medial preoptic neurons. Cells were loaded with Cl - by combining GABA or glycine application with a depolarized voltage, and the time course of [Cl - ] i was followed by measurements of the Cl - equilibrium potential , as obtained from the current recorded during voltage ramps combined with GABA or glycine application. The results show that passive Cl - flux contributes significantly, in the same order of magnitude as does K + -Cl - cotransporter 2 (KCC2), to [Cl - ] i recovery and that Cl - conductance accounts for ∼ 6% of the total resting conductance. A major fraction of this resting Cl - conductance is picrotoxin (PTX)-sensitive and likely due to open GABA A receptors, but ClC-2 channels do not contribute. The results also show that when the decay of GABA A receptor-mediated miniature postsynaptic currents (minis) is slowed by the neurosteroid allopregnanolone, such minis may significantly quicken [Cl - ] i recovery, suggesting a possible steroid-regulated role for minis in the control of Cl - homeostasis.

eneuro

Contribution of Resting Conductance, GABA<sub>A</sub>-Receptor Mediated Miniature Synaptic Currents and Neurosteroid to Chloride Homeostasis in Central Neurons

Contribution of Resting Conductance, GABAA-Receptor Mediated Miniature Synaptic Currents and Neurosteroid to Chloride Homeostasis in Central Neurons

Contribution of Resting Conductance, GABA_A-Receptor Mediated Miniature Synaptic Currents and Neurosteroid to Chloride Homeostasis in Central Neurons