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LTD is involved in the formation and maintenance of rat hippocampal CA1 place-cell fields

Author

Listed:
  • Donovan M. Ashby

    (University of Calgary)

  • Stan B. Floresco

    (University of British Columbia
    University of British Columbia)

  • Anthony G. Phillips

    (University of British Columbia
    University of British Columbia)

  • Alexander McGirr

    (University of Calgary
    University of Calgary)

  • Jeremy K. Seamans

    (University of British Columbia
    University of British Columbia)

  • Yu Tian Wang

    (University of British Columbia
    University of British Columbia)

Abstract

Hippocampal synaptic plasticity includes both long-term potentiation (LTP) and long-term depression (LTD) of synaptic strength, and has been implicated in shaping place field representations that form upon initial exposure to a novel environment. However, direct evidence causally linking either LTP or LTD to place fields remains limited. Here, we show that hippocampal LTD regulates the acute formation and maintenance of place fields using electrophysiology and blocking specifically LTD in freely-moving rats. We also show that exploration of a novel environment produces a widespread and pathway specific de novo synaptic depression in the dorsal hippocampus. Furthermore, disruption of this pathway-specific synaptic depression alters both the dynamics of place field formation and the stability of the newly formed place fields, affecting spatial memory in rats. These results suggest that activity-dependent synaptic depression is required for the acquisition and maintenance of novel spatial information.

Suggested Citation

  • Donovan M. Ashby & Stan B. Floresco & Anthony G. Phillips & Alexander McGirr & Jeremy K. Seamans & Yu Tian Wang, 2021. "LTD is involved in the formation and maintenance of rat hippocampal CA1 place-cell fields," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20317-7
    DOI: 10.1038/s41467-020-20317-7
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