부산대학교 도서관

To purchase or authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1528-1167.2006.00625.x Byline: Alfred Meurs (*), Ralph Clinckers (*), Guy Ebinger (*), Yvette Michotte (*), Ilse Smolders (*) Keywords: Topiramate; Substantia nigra; Pilocarpine; Seizures; Microdialysis Abstract: Summary: Purpose: The substantia nigra pars reticulata (SNR) is known to play a role in gating and control of seizures. Prompted by the observation that intrahippocampal topiramate (TPM) administration does not suppress limbic seizures in the focal pilocarpine model, we investigated the role of the SNR in the anticonvulsant mechanism of action of TPM. Methods: Limbic seizures were evoked in freely moving rats by intrahippocampal administration of pilocarpine via a microdialysis probe. Changes in hippocampal extracellular (EC) glutamate and GABA concentrations were monitored. Effects of intraperitoneal (10-200 mg/kg), intrahippocampal (1-5 mM), and bilateral intranigral (100-300 nmol) TPM administration on pilocarpine-induced seizures and neurochemical changes were evaluated. Effects of TPM administration alone on hippocampal and nigral EC amino acid concentrations were also studied. Results: Systemic and intranigral, but not intrahippocampal TPM administration suppressed pilocarpine-induced seizures and neurochemical changes. Nigral GABA.sub.A receptor blockade by picrotoxin abolished the anticonvulsant effect of TPM in SNR. Systemic TPM administration increased hippocampal glutamate and decreased GABA. Intranigral TPM administration increased hippocampal glutamate, but not GABA. Intrahippocampal TPM increased hippocampal glutamate and GABA, but only at high concentrations. Conclusions: In the focal pilocarpine model, TPM does not exert its anticonvulsant effect at the site of seizure initiation. We identified the SNR as a site of action of TPM, and showed that the nigral GABA-ergic system is central to TPM's anticonvulsant effect in SNR. Anticonvulsant effects and neurochemical changes in hippocampus following intranigral TPM administration suggest the existence of a nigro-hippocampal circuit, which may be involved in the control of limbic seizures. Author Affiliation: (*)Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Research Group Experimental Pharmacology, Vrije Universiteit Brussel, Brussels, Belgium Article History: Accepted March 31, 2006. Article note: Address correspondence and reprints to Dr. Y. Michotte at Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Research Group Experimental Pharmacology, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Brussels Belgium. E-Mail: Ymichot@minf.vub.ac.be