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PRE-RECORDED: THE PATHOPHYSIOLOGICAL ROLE OF MICROGLIAL APOE
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.