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Connection between Immune cells in the brain and Alzheimer’s disease The spreading of pathology within and between brain areas is a hallmark of neurodegenerative disorders. In patients with Alzheimer’s disease, deposition of amyloid-β is accompanied by activation of the innate immune system and involves the inflammasome-dependent formation of ASC specks in microglia. ASC specks released by microglia bind rapidly to amyloid-β and increase the formation of amyloid-β oligomers and aggregates, acting as an inflammation-driven cross-seed for amyloid-β pathology. Here we show that intrahippocampal injection of ASC specks resulted in spreading of amyloid-β pathology in transg...