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Science 13 June 1986:
Vol. 232. no. 4756, pp. 1413 - 1415
DOI: 10.1126/science.2424084
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Articles

Science, Vol 232, Issue 4756, 1413-1415
Copyright © 1986 by American Association for the Advancement of Science

articles

The role of chloride transport in postsynaptic inhibition of hippocampal neurons

U Misgeld, RA Deisz, HU Dodt, and HD Lux

Hippocampal inhibitory postsynaptic potentials are depolarizing in granule cells but hyperpolarizing in CA3 neurons because the reversal potentials and membrane potentials of these cells differ. Here the hippocampal slice preparation was used to investigate the role of chloride transport in these inhibitory responses. In both cell types, increasing the intracellular chloride concentration by injection shifted the reversal potential of these responses in a positive direction, and blocking the outward transport of chloride with furosemide slowed their recovery from the injection. In addition, hyperpolarizing and depolarizing inhibitory responses and the hyperpolarizing and depolarizing responses to the inhibitory neurotransmitter gamma-aminobutyric acid decreased in the presence of furosemide. These effects of furosemide suggest that the internal chloride activity of an individual hippocampal neuron is regulated by two transport processes, one that accumulates chloride and one that extrudes chloride.


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