Xiamen University
Institute of Neuroscience
Dr. Huaxi Xu is Honorary Director and Professor at Institute of Neuroscience at Xiamen University, and formally Jeanne & Gary Herberger Leadership Chair and Director of Neuroscience Initiative at Sanford Burnham Prebys Medical Discovery Institute (SBP). Dr. Xu is an expert specialized in the molecular mechanisms of Alzheimer’s disease (AD). His research is focused on the regulation of APP processing and trafficking, and mechanisms of synaptic dysfunction and neurotoxicity induced by proteotoxic beta amyloid and neurofibrillary tangle (NFT) tau components. Dr. Xu’s laboratory has also engaged in pioneering research in investigating novel genes and pathways involved in neuronal function/dysfunction and cell death and integrating their cellular function to the pathogenesis of neurodegenerative diseases such as AD, Down syndrome and Progressive Supranuclear Palsy. To this end, his laboratory is also developing animal models to study neuronal and microglial function in relation to neurodegenerative dysfunction. Dr. Xu has published ~180 papers with a total impact factor of ~1700 (with ~23,000 citations and an h-index 73). Dr. Xu received his Ph.D. degree from Albert Einstein College of Medicine under joint supervision from Dennis Shields and Gunter Blobel (1999 Laureate of the Nobel Prize in Physiology or Medicine); his thesis studies focused on the intracellular trafficking and proteolytic processing of membrane proteins. Dr. Xu completed his postdoctoral studies at The Rockefeller University, where he was appointed assistant professor in 1998 in the laboratory of Paul Greengard (2000 Laureate of the Nobel Prize in Physiology or Medicine), where he carried out a variety of research projects characterizing signal transduction pathways in the central nervous system. Together with Dr. Guojun Bu (Mayo Clinic), Dr. Xu established the well-respected neuroscience journal, Molecular Neurodegeneration (IF=14.195), which has become one of the top-ranking scientific journals in the neuroscience field.

Presenter of 1 Presentation

PRE-RECORDED: THE PATHOPHYSIOLOGICAL ROLE OF MICROGLIAL APOE

Session Type
SYMPOSIUM
Date
Thu, 17.03.2022
Session Time
05:15 PM - 07:15 PM
Room
ONSITE: 114
Lecture Time
06:45 PM - 07:00 PM
Presenter

Abstract

Abstract Body

Microglia are increasingly implicated in aging and Alzheimer’s disease (AD). Using an isogenic human ES-derived microglia (hMGLs) platform, we recently identified APOE as a convergent pathogenic node for microglial specific late-onset AD risk genes. APOE is abundantly expressed in astrocytes under physiological conditions and dramatically increased in microglia. However, whether microglial APOE exert different functions remains largely elusive. Here, we purified APOE particles derived from primary astrocytes and microglia including hMGLs, and integrate proteomic and lipidomic analysis and neuronal and glial functional test. We found that microglial APOE is more stable than astrocytic APOE, and the size of microglial APOE particles differs from that of astrocytes. In addition, we found that microglial APOE particles are more neurotoxic and more potent in inhibiting microglial migration and phagocytosis of Aβ. Further, microglial APOE particles altered homeostasis of microglia and astrocyte, and impaired mouse cognitive function. Together, our study demonstrates distinct functions of microglial APOE and provides new insights into the contribution of microglial APOE to AD pathogenesis.

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