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Gate, David; Saligrama, Naresha; Leventhal, Olivia; Yang, Andrew C; Unger, Michael S; Middeldorp, Jinte; Chen, Kelly; Lehallier, Benoit; Channappa, Divya; De Los Santos, Mark B; McBride, Alisha; Pluvinage, John; Elahi, Fanny; Tam, Grace Kyin-Ye; Kim, Yongha; Greicius, Michael; Wagner, Anthony D; Aigner, Ludwig; Galasko, Douglas R; Davis, Mark M; Wyss-Coray, Tony
Nature, 01/2020, Letnik: 577, Številka: 7790Journal Article
Alzheimer's disease is an incurable neurodegenerative disorder in which neuroinflammation has a critical function . However, little is known about the contribution of the adaptive immune response in Alzheimer's disease . Here, using integrated analyses of multiple cohorts, we identify peripheral and central adaptive immune changes in Alzheimer's disease. First, we performed mass cytometry of peripheral blood mononuclear cells and discovered an immune signature of Alzheimer's disease that consists of increased numbers of CD8 T effector memory CD45RA (T ) cells. In a second cohort, we found that CD8 T cells were negatively associated with cognition. Furthermore, single-cell RNA sequencing revealed that T cell receptor (TCR) signalling was enhanced in these cells. Notably, by using several strategies of single-cell TCR sequencing in a third cohort, we discovered clonally expanded CD8 T cells in the cerebrospinal fluid of patients with Alzheimer's disease. Finally, we used machine learning, cloning and peptide screens to demonstrate the specificity of clonally expanded TCRs in the cerebrospinal fluid of patients with Alzheimer's disease to two separate Epstein-Barr virus antigens. These results reveal an adaptive immune response in the blood and cerebrospinal fluid in Alzheimer's disease and provide evidence of clonal, antigen-experienced T cells patrolling the intrathecal space of brains affected by age-related neurodegeneration.
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in: SICRIS
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