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Differential Phagocytic Properties of CD45 Microglia and CD45 Brain Mononuclear Phagocytes-Activation and Age-Related Effects. | LitMetric

AI Article Synopsis

Article Abstract

In the central nervous system (CNS), microglia are innate immune mononuclear phagocytes (CNS MPs) that can phagocytose infectious particles, apoptotic cells, neurons, and pathological protein aggregates, such as Aβ in Alzheimer's disease (AD). While CD11bCD45 microglia account for the majority of CNS MPs, a small population of CD11bCD45 CNS MPs is also recognized in AD that surround Aβ plaques. These transcriptionally and pathologically unique CD45 cells have unclear origin and undefined phagocytic characteristics. We have comprehensively validated rapid flow cytometric assays of bulk-phase and amyloid β fibril (fAβ) phagocytosis and applied these to study acutely isolated CNS MPs. Using these methods, we provide novel insights into differential abilities of CD11b CD45 and CD45 CNS MPs to phagocytose macroparticles and fAβ under normal, acute, and chronic neuroinflammatory states. CD45 CNS MPs also highly upregulate TREM2, CD11c, and several disease-associated microglia signature genes and have a higher phagocytic capacity for Aβ as compared to CD45 microglia in the 5xFAD mouse model of AD that becomes more apparent with aging. Our data suggest an overall pro-phagocytic and protective role for CD11bCD45 CNS MPs in neurodegeneration, which if promoted, could be beneficial.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5840283PMC
http://dx.doi.org/10.3389/fimmu.2018.00405DOI Listing

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