| High K-induced Epileptiform Activity under GABA Antagonist and Carbamazepine in the Rat Visual Cortex. |
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Byung Jun Choi |
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Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Korea. choibj@catholic.ac.kr |
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| Abstract |
PURPOSE
The goal of this study was to investigate the effect of increase of K on the excitability of the visual cortex under GABA antagonist, carbamazepine(CBZP), 6-cyano-7-nitroquinoxaline-dione disodium(CNQX) and D-(-)-2-amino-5-phosphonopentanoic acid(D-AP5) on the increase of K-induced epileptiform activity. METHODS: The visual cortex slices were obtained from Sprague-Dawley rats. Extracellular recordings were performed to observe the induction of epileptiform discharges perfused by artificial CSF(ACSF) with an increase of K and the effect of 0.5 and 1 mM CBZP, 10 micrometer CNQX and 50 micrometer D-AP5 on the increase of K-induced epileptiform activity. RESULTS: Spontaneous epileptiform activities were increased by ACSF with 10 mM K under bicuculline compared to 4 mM K. CBZP blocked and 10 micrometer CNQX and 50 micrometer D-AP5 decreased the 10 mM K-induced spontaneous epileptiform activity. CONCLUSION: An increase of K augmented spontaneous epileptiform activity. This experimental model increased the excitability of the brain, which may be influenced by GABA. CBZP blocked the increase of K-induced epileptiform activity, which showed the increase of excitability. An increase of K-induced epileptiform activity was decreased by CNQX and D-AP5, which may show the attenuation of voltage-dependent low magnesium effect and decrease the excitability in terms of synapse induction. |
| Key Words:
K, Carbamazepine |
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