Hippocampal ripples down-regulate synapses

Hiroaki Norimoto, Kenichi Makino, Mengxuan Gao, Yu Shikano, Kazuki Okamoto, Tomoe Ishikawa, Takuya Sasaki, Hiroyuki Hioki, Shigeyoshi Fujisawa, Yuji Ikegaya

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)


The specific effects of sleep on synaptic plasticity remain unclear.We report that mouse hippocampal sharp-wave ripple oscillations serve as intrinsic events that trigger long-lasting synaptic depression. Silencing of sharp-wave ripples during slow-wave states prevented the spontaneous down-regulation of net synaptic weights and impaired the learning of new memories.The synaptic down-regulation was dependent on the N-methyl-D-aspartate receptor and selective for a specific input pathway.Thus, our findings are consistent with the role of slow-wave states in refining memory engrams by reducing recent memory-irrelevant neuronal activity and suggest a previously unrecognized function for sharp-wave ripples.

Original languageEnglish
Pages (from-to)1524-1527
Number of pages4
Issue number6383
Publication statusPublished - 2018 Mar 30
Externally publishedYes

ASJC Scopus subject areas

  • General


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