Age-related changes in hippocampal-dependent synaptic plasticity and memory mediated by p75 neurotrophin receptor

Lik Wei Wong, Yee Song Chong, Wei Lin, Lilian Kisiswa, Eunice Sim, Carlos F. Ibáñez, Sreedharan Sajikumar*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

The plasticity mechanisms in the nervous system that are important for learning and memory are greatly impacted during aging. Notably, hippocampal-dependent long-term plasticity and its associative plasticity, such as synaptic tagging and capture (STC), show considerable age-related decline. The p75 neurotrophin receptor (p75NTR) is a negative regulator of structural and functional plasticity in the brain and thus represents a potential candidate to mediate age-related alterations. However, the mechanisms by which p75NTR affects synaptic plasticity of aged neuronal networks and ultimately contribute to deficits in cognitive function have not been well characterized. Here, we report that mutant mice lacking the p75NTR were resistant to age-associated changes in long-term plasticity, associative plasticity, and associative memory. Our study shows that p75NTR is responsible for age-dependent disruption of hippocampal homeostatic plasticity by modulating several signaling pathways, including BDNF, MAPK, Arc, and RhoA-ROCK2-LIMK1-cofilin. p75NTR may thus represent an important therapeutic target for limiting the age-related memory and cognitive function deficits.

Original languageEnglish
Article numbere13305
JournalAging Cell
Volume20
Issue2
ISSN1474-9718
DOIs
Publication statusPublished - Feb 2021
Externally publishedYes

Keywords

  • aging
  • hippocampus
  • Late-LTP
  • p75
  • synaptic capture
  • synaptic tagging

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