Local projections of layer Vb-to-Va are more prominent in lateral than in medial entorhinal cortex

Shinya Ohara, Stefan Blankvoort, Rajeevkumar R. Nair, Maximiliano J. Nigro, Eirik S. Nilssen, Clifford Kentros, Menno P. Witter

Research output: Contribution to journalArticlepeer-review

Abstract

The entorhinal cortex, in particular neurons in layer V, allegedly mediate transfer of information from the hippocampus to the neocortex, underlying long-term memory. Recently, this circuit has been shown to comprise a hippocampal output recipient layer Vb and a cortical projecting layer Va. With the use of in vitro electrophysiology in transgenic mice specific for layer Vb, we assessed the presence of the thus necessary connection from layer Vb-to-Va in the functionally distinct medial (MEC) and lateral (LEC) subdivisions; MEC, particularly its dorsal part, processes allocentric spatial information, whereas the corresponding part of LEC processes information representing elements of episodes. Using identical experimental approaches, we show that connections from layer Vb-to-Va neurons are stronger in dorsal LEC compared with dorsal MEC, suggesting different operating principles in these two regions. Although further in vivo experiments are needed, our findings imply a potential difference in how LEC and MEC mediate episodic systems-consolidation.

Original languageEnglish
Article numbere67262
JournaleLife
Volume10
DOIs
Publication statusPublished - 2021 Mar

Keywords

  • Hippocampal-cortical output circuit
  • Hippocampalentorhinal re-entry circuit
  • Local circuit
  • Parahippocampal region
  • Systems memory consolidation

ASJC Scopus subject areas

  • Neuroscience(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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