Abstract
In the mammalian cortex, glutamate1 and γ-aminobutyric acid (GABA)2 are the principal transmitters mediating excitatory and inhibitory synaptic events. Glutamate activates cation conduct-ances that lead to membrane depolarization whereas GABA controls chloride conductances that produce hyperpolarization. Here we report that the GABAA-activated conductance in hippocampal pyramidal cells is enhanced by glutamate at concentrations below that required for its excitatory action. The GABA-potentiating effect can be induced, with comparable potency, by several gluta-mate analogues such as quisqualate, N-methyl-D-aspartate (NMDA), kainate and, surprisingly, by D-2-amino-5-phosphonovalerate (APV), an antagonist for NMDA receptors. Data from dose-response curves show that glutamate enhances the GABAA conductance without significantly changing GABA binding affinity. The low concentration of glutamate needed to enhance GABAA responses raises the possibility that glutamate modulates the strength of GABA-mediated transmission in the cortex.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Watkins, J. C. & Evans, R. H. A. Rev. Pharmac. Tox. 21, 165–204 (1981).
Krnjevic, K. Physiol. Rev. 54, 418–540 (1974).
Kay, A. R. & Wong, R. K. S. J. Neurosci. Meth. 16, 227–238 (1986).
Kiskin, N. I., Krishtal, O. A. & Tsyndrenko, A. Y. Neurosci. Lett. 63, 225–230 (1986).
Verdoorn, T. A., Kleckner, N. W. & Dingledine, R. Science 238, 1114–1116 (1987).
Olsen, R. W. & Venter, J. C. (eds) Benzodiazepine/ GABA Receptors and Chloride Channels: Structural and Functional Properties (Liss, New York, 1987).
Stephenson, F. A. Biochem. J. 249, 21–32 (1988).
Bormann, J. Trends Neurosci. 11, 112–116 (1988).
Lambert, J. J., Peters, J. A. & Cottrell, G. A. Trends Neurosci. 8, 224–227 (1987).
Connor, J. A., Wadman, W. J., Hockberger, P. E. & Wong, R. K. S. Science 240, 649–653 (1988).
Stelzer, A., Kay, A. R. & Wong, R. K. S. Science 241, 339–341 (1988).
Stelzer, A., Slater, N. T. & ten Bruggencate, G. Nature 326, 698–701 (1987).
Lajtha, A. L., Maker, H. S. & Clarke, D. D. in Basic Neurochemistry (eds, Siegel, G. J. et al.), (Little & Brown, Boston, 1981).
Ferraro, T. N. & Hare, T. A. Brain Res. 338, 53–60 (1985).
Johnson, J. W. & Ascher, P. Nature 325, 529–531 (1987).
Docherty, M., Bradford, H. F. & Wu, J.-Y. Nature 330, 64–66 (1987).
Tsien, R. Y. Biochemistry 19, 2396–2404 (1980).
Hamill, O. P., Marty, A., Neher, E., Sakmann, B. & Sigworth, F. J. Pflugers Arch. ges. Physiol. 391, 85–100 (1981).
Bowery, N. G. et al. Neuropharmac. 23, 219–231 (1984).
Huguenard, J. R. & Alger, B. E. J. Neuraphysiol. 56, 1–18 (1986).
Johnston, D. & Brown, T. M. J. Neurophysiol. 50, 464–486 (1983).
Ashwood, T. J., Collingridge, G. L., Herron, C. E. & Wheal, H. V. J. Physiol. 384, 27–37 (1987).
Konnerth, A., Lux, H. D. & Morad, M. J. Physiol. 386, 603–633 (1987).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Stelzer, A., Wong, R. GABAA responses in hippocampal neurons are potentiated by glutamate. Nature 337, 170–173 (1989). https://doi.org/10.1038/337170a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/337170a0
This article is cited by
-
Glutamate and GABAA receptor crosstalk mediates homeostatic regulation of neuronal excitation in the mammalian brain
Signal Transduction and Targeted Therapy (2022)
-
Cerebellar-Stimulation Evoked Prefrontal Electrical Synchrony Is Modulated by GABA
The Cerebellum (2018)
-
Allosteric potentiation of glycine receptor chloride currents by glutamate
Nature Neuroscience (2010)
-
Inhibitory glutamate receptor channels
Molecular Neurobiology (1996)
-
Cholinoreactivity in cortical neurons: Dependence on the structure of their responses to acetylcholine and glutamate
Neurophysiology (1995)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.