Detection of gamma-aminobutyric acid-induced glutamate release in acute mouse hippocampal slices with a patch sensor

Analytical Biochemistry
Mitsuyoshi ShimaneMasao Sugawara

Abstract

gamma-Aminobutyric acid (GABA)-stimulated release of L-glutamate from various neuronal regions of acute mouse hippocampal slices was detected with a patch sensor that responds to L-glutamate at the sub-micromolar level. The response of the patch sensor to L-glutamate was evaluated in terms of an integrated current. The integrated current increased with the concentration of L-glutamate ranging from 0.50 to 5.0 microM. By using the patch sensor, GABA-induced L-glutamate release from acute mouse hippocampal slices was detected. The effect of antagonists for GABA(A) and GABA(B) receptors on the L-glutamate release was also investigated. The GABA (25 microM) stimulation induced the release of L-glutamate via GABA(A) receptor in the CA1 region, but GABA did not induce L-glutamate release in the CA3 region. However, in the presence of the GABA(B) receptor antagonist (3-aminopropyl)(diethoxymethyl)phosphinic acid (CGP-35348), release of L-glutamate in the CA3 region was evoked by GABA stimulation. The glutamate release was completely suppressed when both GABA(A) and GABA(B) receptor were inhibited. The current results show that the glutamate release in the CA3 region occurs via a GABA(A) pathway when GABA(B) receptors are inhibited.

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Citations

Mar 12, 2009·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Takayuki OkaMasao Sugawara
Oct 19, 2010·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Hiromi ChibaMasao Sugawara
Feb 13, 2013·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Natsumi SomaMasao Sugawara
Nov 15, 2017·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Masao Sugawara
Dec 1, 2007·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Masao Sugawara
Jan 15, 2014·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Masao SugawaraMisato Sakamoto

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