Up-regulation of APP endocytosis by neuronal aging drives amyloid dependent-synapse loss

Research output: Contribution to journalArticle

Abstract

Neuronal aging increases the risk of late-onset Alzheimer's disease. During normal aging, synapses decline, and β-amyloid (Aβ) accumulates intraneuronally. However, little is known about the underlying cell biological mechanisms. We studied normal neuronal aging using normal aged brain and aged mouse primary neurons that accumulate lysosomal lipofuscin and show synapse loss. We identify the up-regulation of amyloid precursor protein (APP) endocytosis as a neuronal aging mechanism that potentiates APP processing and Aβ production in vitro and in vivo. The increased APP endocytosis may contribute to the observed early endosomes enlargement in the aged brain. Mechanistically, we show that clathrin-dependent APP endocytosis requires F-actin and that clathrin and endocytic F-actin increase with neuronal aging. Finally, Aβ production inhibition reverts synaptic decline in aged neurons while Aβ accumulation, promoted by endocytosis up-regulation in younger neurons, recapitulates aging-related synapse decline. Overall, we identify APP endocytosis up-regulation as a potential mechanism of neuronal aging and, thus, a novel target to prevent late-onset Alzheimer's disease.

Details

Authors
Organisations
External organisations
  • New University of Lisbon
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Neurosciences
  • Neurology
Original languageEnglish
JournalJournal of Cell Science
Publication statusE-pub ahead of print - 2021 Apr 28
Publication categoryResearch
Peer-reviewedYes