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J Neurophysiol 88: 523-527, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 1 July 2002, pp. 523-527
Copyright ©2002 by the American Physiological Society

RAPID COMMUNICATION

Paradoxical Anti-Epileptic Effects of a GluR5 Agonist of Kainate Receptors

Ilgam Khalilov, June Hirsch, Rosa Cossart, and Yehezkel Ben-Ari

Institut de Neurobiologie de la Méditerranée, Institut National de la Santé et de la Recherche Médicale, U29, Marseille, France

Khalilov, Ilgam, June Hirsch, Rosa Cossart, and Yehezkel Ben-Ari. Paradoxical Anti-Epileptic Effects of a GluR5 Agonist of Kainate Receptors. J. Neurophysiol. 88: 523-527, 2002. Kainate generates in adult hippocampal neurons a seizure but also a massive excitation of interneurons and a dramatic increase of the inhibitory drive that impinges on principal cells. This "overinhibition" is largely mediated by GluR5-containing kainate receptors that are enriched on interneurons. Here, using the neonatal intact hippocampus in vitro and the triple chamber, we first show that this mechanism is fully operative in neonatal neurons. We then report that application to one hippocampus of (RS)-2-amino-3-(5-tert-butyl-3-hydroxy-4-isoxazolyl)propionic acid---a relatively selective agonist of GluR5 containing kainate receptors---depresses the propagation of seizure generated in the opposite hippocampus by a convulsive agent. We conclude that the selective excitation of interneurons by GluR5-containing kainate receptor agonists opens a new therapeutic approach for the epilepsies.




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