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Science 15 July 1988:
Vol. 241. no. 4863, pp. 339 - 341
DOI: 10.1126/science.2455347
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Articles
Science, Vol 241, Issue 4863, 339-341
Copyright © 1988 by American Association for the Advancement of Science
GABAA-receptor function in hippocampal cells is maintained by phosphorylation factors
A Stelzer,
AR Kay,
and
RK Wong
Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
Gamma aminobutyric acid (GABA) mediates fast synaptic inhibition in the central nervous system by activating the chloride-permeable GABAA channel. The GABAA conductance progressively diminishes with time when the intracellular contents of hippocampal neurons are perfused with a minimal intracellular medium. This "run down" of the GABA-activated conductance can be prevented by the inclusion of magnesium adenosine triphosphate and calcium buffer in the intracellular medium. The amount of chloride conductance that can be activated by GABA is determined by competition between a calcium-dependent process that reduces the conductance and a phosphorylation process that maintains the conductance.
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