Expanded CD8 T-cell sharing between periphery and CNS in multiple sclerosis

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Salou, Marion | Garcia, Alexandra | Michel, Laure | Gainche-Salmon, Anne | Loussouarn, Delphine | Nicol, Bryan | Guillot, Flora | Hulin, Philippe | Nedellec, Steven | Baron, Daniel | Ramstein, Gérard | Soulillou, Jean-Paul | Brouard, Sophie | Nicot, Arnaud B | Degauque, Nicolas | Laplaud, David A

Edité par CCSD ; Wiley -

International audience. Objective: In multiple sclerosis (MS), central nervous system (CNS), cerebrospinal fluid (CSF), and blood display TCR clonal expansions of CD8+ T cells. These clones have been assumed – but never demonstrated – to be similar in the three compartments. Addressing this key question is essential to infer the implication of peripheral clonally expanded CD8+ T cells in the disease.Methods: For the first time, TCR Vβ repertoire from paired blood (purified CD8+ and CD4+ T cells), CSF and CNS (22 lesions, various inflammatory and demyelination statuses) samples from three MS patients was studied using complementary determining region 3 (CDR3) spectratyping and high-throughput sequencing. In parallel, blood and CNS clonally expanded CD8+ T cells were characterized by fluorescent staining.Results: TCR Vβ repertoire analysis revealed strong sharing of predominant T-cell clones between CNS lesions, CSF, and blood CD8+ T cells. In parallel, we showed that blood oligoclonal CD8+ T cells exhibit characteristics of pathogenic cells, as they displayed a bias toward a memory phenotype in MS patients, with increased expression of CCR5, CD11a and Granzyme B (GZM-B) compared to non oligoclonal counterparts. CNS-infiltrating T cells were mainly CD8 expressing CD11a and GZM-B.Interpretation: This study highlights the predominant implication of CD8+ T cells in MS pathophysiology and demonstrates that potentially aggressive CD8+ T cells can be easily identified and characterized from blood andCSF samples.

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