Voltage- and use-dependent block by 1-methyl-4-phenylpyridinium ion (MPP+) of N-methyl-d-aspartate-activated currents in rat hippocampal neurons

Kuei Sen Hsu, Chiung Chun Huang, Po Wu Gean

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

The effects of 1-methyl-4-phenylpyridinium ion (MPP+) on N-methyl-d-aspartate (NMDA) receptor-channel complex were studied in rat hippocampal neurons using intracellular- and whole-cell voltage clamp-recording techniques. Intracellular recordings were made from CA1 pyramidal cells of rat hippocampal slices in the presence of 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX; 10 μM) and picrotoxin (PTX; 50 μM) which block non-NMDA and GABAA receptors, respectively. Superfusion of MPP+ reversibly decreases the pharmacologically isolated NMDA receptor-mediated excitatory postsynaptic potential (EPSPNMDA) in a concentration-dependent manner. In other experiments, we observed that MPP+ attenuated NMDA-evoked whole-cell currents in a voltage- and use-dependent manner and was not dependent on the extracellular glycine or spermine concentration on neurons freshly dissociated from rat hippocampi CA1 region. These results suggest that MPP+, applied at micromolar concentrations, is a non-competitive NMDA receptor antagonist in rat hippocampal neurons.

原文English
頁(從 - 到)17-20
頁數4
期刊Neuroscience Letters
189
發行號1
DOIs
出版狀態Published - 1995 四月 7

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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