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Moreover, T cell infiltration in the brain has not been thoroughly studied in Parkinson\u2019s disease and no study has assessed the infiltration in incidental Lewy body diseases cases that are considered to be early presymptomatic stages of the disease. In this study, we performed an immunohistochemistry\/immunofluorescence quantitative and phenotypic assessment of T cell infiltration in human substantia nigra pars compacta and analysed the correlations with neuronal death and synucleinopathy throughout different stages of the disease. We included two groups of incidental Lewy disease in the study. One of the groups, which is believed to be the earliest stage of the disease, showed \u03b1-synuclein aggregates only in the olfactory bulb. The second group also presented \u03b1-synuclein aggregates in the substantia nigra. We also assessed the formation of different \u03b1-synuclein aggregates throughout the different stages of the unified staging system for Lewy body disorders (I to IV). We found that CD8 T cells were increased in diagnosed Parkinson\u2019s disease cases compared to the control group and their density positively correlated with neuronal death. Some of the infiltrating CD8 T cells were indeed contacting dopaminergic neurons. No differences were found regarding CD4 T cells. In the earliest stage of the disease, when substantia nigra \u03b1-synuclein aggregation is absent, we found a robust CD8 T cell infiltration and no dopaminergic neuronal death yet. Conversely, in the next stage we found neuronal loss and a milder CD8 T cell infiltration. CD8 T cell infiltration paralleled that of \u03b1-synuclein accumulation and neuronal death throughout stages II to IV. We also confirmed that CD8 T cells in charge of immune surveillance and involved in the aetiopathogenesis of the disease are equipped with cytolytic enzymes (granzyme A, B and K) and\/or proinflammatory cytokines (interferon gamma), and that phenotypic differences were observed between early and late stages of the disease. We also demonstrate that a high proportion of nigral CD8 T cells are tissue resident memory T cells. Our results show that nigral cytotoxic CD8 T cell infiltration is an earlier pathogenic event than \u03b1-synuclein aggregation and neuronal death and that it parallels the progression of neuronal death and synucleinopathy in Parkinson\u2019s disease. Overall, our study suggests that CD8 T cell cytotoxic attack may initiate and propagate neuronal death and synucleinopathy in Parkinson\u2019s disease.<\/jats:p>","DOI":"10.1093\/brain\/awaa269","type":"journal-article","created":{"date-parts":[[2020,7,31]],"date-time":"2020-07-31T15:12:52Z","timestamp":1596208372000},"page":"3717-3733","source":"Crossref","is-referenced-by-count":277,"title":["CD8 T cell nigral infiltration precedes synucleinopathy in early stages of Parkinson\u2019s disease"],"prefix":"10.1093","volume":"143","author":[{"given":"Jordi","family":"Galiano-Landeira","sequence":"first","affiliation":[{"name":"Neurodegenerative Diseases Research Group, Vall d\u2019Hebron Research Institute, Center for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Barcelona, Catalonia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert","family":"Torra","sequence":"additional","affiliation":[{"name":"Neurodegenerative Diseases Research Group, Vall d\u2019Hebron Research Institute, Center for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Barcelona, Catalonia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miquel","family":"Vila","sequence":"additional","affiliation":[{"name":"Neurodegenerative Diseases Research Group, Vall d\u2019Hebron Research Institute, Center for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED), Barcelona, Catalonia, Spain"},{"name":"Department of Biochemistry and Molecular Biology, Autonomous University of Barcelona, Barcelona, Catalonia, Spain"},{"name":"Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Catalonia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordi","family":"Bov\u00e9","sequence":"additional","affiliation":[{"name":"Neurodegenerative Diseases Research Group, Vall d\u2019Hebron Research Institute, Center for Networked Biomedical Research on Neurodegenerative 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