N-methyl-D-aspartate receptor plasticity in kindling: quantitative and qualitative alterations in the N-methyl-D-aspartate receptor-channel complex.

Proceedings of the National Academy of Sciences of the United States of America
G C YehJ O McNamara

Abstract

Kindling is an animal model of epilepsy and neuronal plasticity produced by periodic electrical stimulation of the brain. Electrophysiologic studies indicate that this phenomenon is associated with increased participation of N-methyl-D-aspartate (NMDA) receptors in excitatory synaptic transmission. Biochemical studies suggest that a change intrinsic to the NMDA receptor-channel complex may contribute to the increase in NMDA receptor-mediated synaptic transmission. We tested this idea by measuring the binding of 3-[(+)-2-(carboxypiperazin-4-yl)][1,2-3H]propyl-1-phosphonic acid ([3H]CPP), [3H]glycine, and tritiated N-[(1-thienyl)cyclohexyl]piperidine [( 3H]TCP) to rat hippocampal membranes. In this preparation these ligands are selective for the NMDA receptor, the strychnine-insensitive glycine receptor, and the NMDA receptor-gated ion channel, respectively. Kindling increased the density of CPP, glycine, and TCP binding sites in hippocampal membranes by 47%, 42%, and 25%, respectively. No significant changes were detected in the affinity of these binding sites. Surprisingly, alterations in the glycine binding site were detected in animals sacrificed 1 month but not 1 day after the final kindling stimulation. Thus, delayed upregu...Continue Reading

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Citations

Sep 8, 2010·Journal of Neural Transmission·Viktor SzegediDénes Budai
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