Hippocampal High-Frequency Stimulation Inhibites the Progression of Rapid Kindling-Induced Seizure in Rats

DOI: 10.4236/nm.2013.42011   PDF   HTML   XML   3,679 Downloads   5,773 Views   Citations


Epilepsy is one of the most common serious neurological disorders. Pharmacoresistant epilepsy patients are poorly controlled or their seizures are refractory to drug treatment. Resective surgery is frequently a promising therapy in this population, however, not all the patients meet the eligibility criteria for the surgical treatment. Deep brain stimulation has been investigated in clinical studies and animal studies as an alternative treatment, but the optimal stimulation parameters remain an issue. The present study was designed to investigate the effect of unilateral high-frequency stimulation (HFS) of hippocampus on seizure development by using the hippocampal rapid kindling method (hRK) in rats, and compared the results with those of low-frequency stimulation previously published by our group. We used male Wistar rats implanted with electrodes in the ventral hippocampus. All rats underwent hRK (biphasic square wave pulses, 20 Hz for 10 seconds) during three consecutive days (twelve stimulations per day). The control group (hRK; n = 7) received only RK stimulus, while the treated group (HFS-hRK; n = 9) received also HFS (biphasic square wave pulses, 130 Hz for 30 seconds) immediately before the RK stimulus, during three consecutive days. At the end of behavioral testing 78% (p < 0.01) of the animals receiving HFS treatment were still not fully kindled staying in stages 0 -III (p < 0.01). HFS group needed a higher number of stimulations to achieve stage III (p < 0.05) with respect to control group. However, no significant differences in the cumulative daily afterdischarge duration were observed. HFS did not present significant differences compared with LFS in any of studied parameters. The findings suggest that unilateral HFS applied on hippocampus effectively inhibited the epileptogenic process induced by hippocampal rapid kindling. According to the comparative results about hippocampal rapid kindled animals stimulated with HFS and LFS (5 Hz), we found no conclusive information on which treatment is most efficient.

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B. Gori, M. Pereyra, L. Toibaro, C. Brescacin, G. Battaglia, J. Pastorino, A. Smigliani, M. Galardi and S. Kochen, "Hippocampal High-Frequency Stimulation Inhibites the Progression of Rapid Kindling-Induced Seizure in Rats," Neuroscience and Medicine, Vol. 4 No. 2, 2013, pp. 71-76. doi: 10.4236/nm.2013.42011.

Conflicts of Interest

The authors declare no conflicts of interest.


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