Embryonic Rat Hippocampal Neurons and GABAA Receptor Subunit-Transfected Non-neuronal Cells Release GABA Tonically

Embryonic Rat Hippocampal Neurons and GABAA Receptor Subunit-Transfected Non-neuronal Cells... We used patch-clamp recording techniques to investigate the contribution of GABA to baseline membrane properties in cultured embryonic rat hippocampal neurons. Almost all of the neurons recorded with Cl−-filled pipettes and clamped at negative potentials exhibited baselines that were noticeably noisy, with microscopic fluctuations superimposed on the macroscopic holding current. A gentle steam of saline applied to the neuronal surface rapidly and reversibly reduced the baseline current and fluctuations, both of which were completely eliminated by bicuculline. Fluctuation analysis showed that the variance in the baseline current signal was exponentially distributed with estimated kinetics comparable to those activated by submicromolar concentrations of exogenous GABA. The kinetics of Cl− channels activated by endogenous GABA displayed a potential sensitivity comparable to those activated by exogenous GABA. Non-neuronal cells stably transfected with α1 and γ2 GABAA receptor subunits exhibited little baseline current variance when recorded with Cl−-filled pipettes. Addition of micromolar GABA to the extracellular saline or to the pipette solution induced a saline- and bicuculline-sensitive baseline current signal comparable to that recorded in hippocampal neurons. Thus, both intra- and extracellular sources of GABA could contribute to the baseline properties recorded in these cultured neurons. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Embryonic Rat Hippocampal Neurons and GABAA Receptor Subunit-Transfected Non-neuronal Cells Release GABA Tonically

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Publisher
Springer Journals
Copyright
Copyright © Inc. by 1998 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002329900409
Publisher site
See Article on Publisher Site

Abstract

We used patch-clamp recording techniques to investigate the contribution of GABA to baseline membrane properties in cultured embryonic rat hippocampal neurons. Almost all of the neurons recorded with Cl−-filled pipettes and clamped at negative potentials exhibited baselines that were noticeably noisy, with microscopic fluctuations superimposed on the macroscopic holding current. A gentle steam of saline applied to the neuronal surface rapidly and reversibly reduced the baseline current and fluctuations, both of which were completely eliminated by bicuculline. Fluctuation analysis showed that the variance in the baseline current signal was exponentially distributed with estimated kinetics comparable to those activated by submicromolar concentrations of exogenous GABA. The kinetics of Cl− channels activated by endogenous GABA displayed a potential sensitivity comparable to those activated by exogenous GABA. Non-neuronal cells stably transfected with α1 and γ2 GABAA receptor subunits exhibited little baseline current variance when recorded with Cl−-filled pipettes. Addition of micromolar GABA to the extracellular saline or to the pipette solution induced a saline- and bicuculline-sensitive baseline current signal comparable to that recorded in hippocampal neurons. Thus, both intra- and extracellular sources of GABA could contribute to the baseline properties recorded in these cultured neurons.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Aug 1, 1998

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