論文

査読有り 国際誌
2020年9月29日

Urethane anesthesia suppresses hippocampal subthreshold activity and neuronal synchronization.

Brain research
  • Haruya Yagishita
  • ,
  • Yuya Nishimura
  • ,
  • Asako Noguchi
  • ,
  • Yu Shikano
  • ,
  • Yuji Ikegaya
  • ,
  • Takuya Sasaki

1749
開始ページ
147137
終了ページ
147137
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.brainres.2020.147137

Urethane, an anesthetic utilized for animal experiments, induces neocortical slow oscillations in which a large number of neurons emit rhythmic synchronized activity. However, it remains unclear how urethane affects neuronal activity in the hippocampus. In this study, we obtained in vivo patch-clamp recordings from dorsal hippocampal CA1 neurons in mice and found a reduction in the fluctuation of subthreshold membrane potentials during urethane anesthesia, implying reduced synaptic activity in the hippocampus. We then performed spike unit recordings from dorsal hippocampal CA1 neuronal ensembles in rats and found prominent reductions in the spike rates of the majority of hippocampal units, especially spatially selective units, during urethane anesthesia, whereas a subset of nonspatial units exhibited increased spike rates. The overall reductions in neuronal spike rates induced by urethane led to prominent decreases in spike synchronization across neuronal units. Consistently, the magnitude of hippocampal sharp wave ripples was also reduced by urethane. The suppression of hippocampal neuronal synchronization by urethane may lead to the disruption of offline memory reactivation mechanisms.

リンク情報
DOI
https://doi.org/10.1016/j.brainres.2020.147137
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/33007303

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