Venegas C, Kumar S, Franklin BS, Dierkes T, Brinkschulte R, Tejera D, Vieira-Saecker A, Schwartz S, Santarelli F, Kummer MP, Griep A, Gelpi E, Beilharz M, Riedel D, Golenbock DT, Geyer M, Walter J, Latz E, Heneka MT

Nature. 2017 Dec 20;552(7685):355-361. doi: 10.1038/nature25158.

Abstract

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 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 transgenic double-mutant APP_SwePSEN1_dE9 mice. By contrast, homogenates from brains of APP_SwePSEN1_dE9 mice failed to induce seeding and spreading of amyloid-β pathology in ASC-deficient APP_SwePSEN1_dE9 mice. Moreover, co-application of an anti-ASC antibody blocked the increase in amyloid-β pathology in APP_SwePSEN1_dE9 mice. These findings support the concept that inflammasome activation is connected to seeding and spreading of amyloid-β pathology in patients with Alzheimer's disease.

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