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J Neurophysiol 87: 1655-1658, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 87 No. 3 March 2002, pp. 1655-1658
Copyright ©2002 by the American Physiological Society

RAPID COMMUNICATION

Network Interactions Mediated by New Excitatory Connections Between CA1 Pyramidal Cells in Rats With Kainate-Induced Epilepsy

Bret N. Smith and F. Edward Dudek

Department of Anatomy and Neurobiology, Program in Molecular, Cellular, and Integrative Neuroscience, Colorado State University, Fort Collins, Colorado 80523

Smith, Bret N. and F. Edward Dudek. Network Interactions Mediated by New Excitatory Connections Between CA1 Pyramidal Cells in Rats With Kainate-Induced Epilepsy. J. Neurophysiol. 87: 1655-1658, 2002. Axon sprouting and synaptic reorganization in the hippocampus are associated with the development of seizures in temporal lobe epilepsy. Synaptic interactions among CA1 pyramidal cells were examined in fragments of hippocampal slices containing only the CA1 area from saline- and kainate-treated rats. Glutamate microapplication to the pyramidal cell layer increased excitatory postsynaptic current (EPSC) frequency, but only in rats with kainate-induced epilepsy. In bicuculline, action potentials evoked in single pyramidal cells increased the frequency of network bursts only in slices from rats with kainate-induced epilepsy. These data further support the hypothesis that excitatory connections between CA1 pyramidal cells increase after kainate-induced status epilepticus.




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