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  • Wood, Jack, 1997, et al. (författare)
  • Plaque contact and unimpaired Trem2 is required for the microglial response to amyloid pathology
  • 2022
  • Ingår i: Cell Reports. - : Elsevier BV. - 2211-1247. ; 41:8
  • Tidskriftsartikel (refereegranskat)abstract
    • Using spatial cell-type-enriched transcriptomics, we compare plaque-induced gene (PIG) expression in mi-croglia-touching plaques, neighboring plaques, and far from plaques in an aged Alzheimer's mouse model with late plaque development. In 18-month-old APPNL-F/NL-F knockin mice, with and without the Alzheimer's disease risk mutation Trem2R47H/R47H, we report that expression of 38/55 PIGs have plaque-induced micro-glial upregulation, with a subset only upregulating in microglia directly contacting plaques. For seven PIGs, including Trem2, this upregulation is prevented in APPNL-F/NL-FTrem2R47H/R47H mice. These TREM2-depen-dent genes are all involved in phagocytic and degradative processes that we show correspond to a decrease in phagocytic markers and an increase in the density of small plaques in Trem2-mutated mice. Furthermore, despite the R47H mutation preventing increased Trem2 gene expression, TREM2 protein levels and micro-glial density are still marginally increased on plaques. Hence, both microglial contact with plaques and func-tioning TREM2 are necessary for microglia to respond appropriately to amyloid pathology.
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