Presenter of 1 Presentation
PRE-RECORDED: APOE4 blood-brain barrier dysfunction, cognitive dysfunction and therapeutic opportunities
Abstract
Abstract Body
Apolipoprotein E4 (APOE4), the main susceptibility gene for Alzheimer’s disease (AD), exerts cerebrovascular toxicity and accelerates vascular dysfunction, amyloid-b and tau pathology, neurodegenerative disorder and dementia in AD. How these different pathologies relate to each other to confer APOE4-associated cognitive impairment remains still unclear and challenging to dissect. Here, I will briefly review 1) our recent findings in human APOE4 carriers and non-carriers (APOE3 homozygotes) suggesting the role of blood-brain barrier (BBB) breakdown in development of early human cognitive dysfunction and APOE4-associated cognitive decline both in individuals with positive and negative AD amyloid-b and tau biomarkers abnormalities; and 2) our recent cellular and molecular studies in humanized APOE knock-in mice including comprehensive large-scale analysis of cell-specific BBB mechanisms by single-nucleus RNA-sequencing, phosphoproteome and proteome analysis suggesting that changes in APOE4 disrupts multiple BBB signaling mechanisms that precedes loss of neurites, post-synaptic PSD95 interactome dysregulation, and behavioral deficits. Finally, I will briefly discuss potential therapeutic opportunities to control neurodegenerative and cognitive disorders by targeting BBB signaling mechanisms that regulate cerebrovascular integrity.