Breakdown of spatial coding and interneuron synchronization in epileptic mice

Tristan Shuman, Daniel Aharoni, Denise J. Cai, Christopher R. Lee, Spyridon Chavlis, Lucia Page-Harley, Lauren M. Vetere, Yu Feng, Chen Yi Yang, Irene Mollinedo-Gajate, Lingxuan Chen, Zachary T. Pennington, Jiannis Taxidis, Sergio E. Flores, Kevin Cheng, Milad Javaherian, Christina C. Kaba, Naina Rao, Mimi La-Vu, Ioanna PandiMatthew Shtrahman, Konstantin I. Bakhurin, Sotiris C. Masmanidis, Baljit S. Khakh, Panayiota Poirazi, Alcino J. Silva, Peyman Golshani

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Temporal lobe epilepsy causes severe cognitive deficits, but the circuit mechanisms remain unknown. Interneuron death and reorganization during epileptogenesis may disrupt the synchrony of hippocampal inhibition. To test this, we simultaneously recorded from the CA1 and dentate gyrus in pilocarpine-treated epileptic mice with silicon probes during head-fixed virtual navigation. We found desynchronized interneuron firing between the CA1 and dentate gyrus in epileptic mice. Since hippocampal interneurons control information processing, we tested whether CA1 spatial coding was altered in this desynchronized circuit, using a novel wire-free miniscope. We found that CA1 place cells in epileptic mice were unstable and completely remapped across a week. This spatial instability emerged around 6 weeks after status epilepticus, well after the onset of chronic seizures and interneuron death. Finally, CA1 network modeling showed that desynchronized inputs can impair the precision and stability of CA1 place cells. Together, these results demonstrate that temporally precise intrahippocampal communication is critical for spatial processing.

Original languageEnglish
Pages (from-to)229-238
Number of pages10
JournalNature Neuroscience
Volume23
Issue number2
DOIs
StatePublished - 1 Feb 2020

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