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The Effects of Topiramate on Caspase-3 Expression in Hippocampus of Basolateral Amygdala (BLA) Electrical Kindled Epilepsy Rat

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Abstract

Caspase-3 expression was determined in the hippocampus of electrically kindled rats with and without topiramate treatment. Bipolar electrotrodes were implanted for chronic stimulation of the basolateral amygdala (BLA) to achieve a kindled state. Seizure and behavioral responses were observed, and video-electroencephalograms were recorded during and after kindling. After topiramate treatment (80 mg/kg, p.o.), the hippocampi were extracted and caspase-3 mRNA analyzed by semiquantitative RT-PCR. Caspase-3 immunoreactivity was determined with immunohistochemical staining. Topiramate treatment resulted in a significant decrease in the mean duration of seizures from 52 s in kindled rats to 13 s. The after-discharge duration was significantly decreased by 70% after topiramate treatment. Significant upregulations of both caspase-3 mRNA and caspase-3 immunoreactivity were observed in the kindled rats. These kindling-mediated increases in caspase-3 were prevented by topiramate treatment, and these levels were not different from those of sham-operated controls. In BLA-kindled rats, mRNA and immunoreactivity for caspase-3 were increased. Treatment with topiramate prevented the kindling-associated increases in caspase-3 as well as the increases in seizure duration and after-discharge duration. These data suggest that topiramate may have a neuroprotective role in addition to its action as an anticonvulsant.

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Acknowledgement

We would like to thank Drs. Douglas E. Brenneman and Illana Gozes for extensive editorial suggestions; Prof. Qizhang Yin and Shan Gong for technical assistance in model establishment; Dr. Xiaodong Wang for offering stimulator; and Dr. Xueming Zhu for advice with microscopy. This work was supported by the Medical Development Foundation of Suzhou University (2007) and Suzhou Social Development Foundation (No.SS08016) Xuqin Chen and Guanshui Bao contributed equally to this work.

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Correspondence to Zhedong Wang or Xueguang Zhang.

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Chen, X., Bao, G., Hua, Y. et al. The Effects of Topiramate on Caspase-3 Expression in Hippocampus of Basolateral Amygdala (BLA) Electrical Kindled Epilepsy Rat. J Mol Neurosci 38, 201–206 (2009). https://doi.org/10.1007/s12031-008-9173-4

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