CD8⺠MAIT cells infiltrate into the CNS and alterations in their blood frequencies correlate with IL-18 serum levels in multiple sclerosis.
Eur J Immunol
; 44(10): 3119-28, 2014 Oct.
Article
em En
| MEDLINE
| ID: mdl-25043505
ABSTRACT
Recent findings indicate a pathogenic involvement of IL-17-producing CD8(+) T cells in multiple sclerosis (MS). IL-17 production has been attributed to a subset of CD8(+) T cells that belong to the mucosal-associated invariant T (MAIT) cell population. Here, we report a reduction of CD8(+) MAIT cells in the blood of MS patients compared with healthy individuals, which significantly correlated with IL-18 serum levels in MS patients. In vitro stimulation of peripheral blood mononuclear cells from healthy individuals and MS patients with IL-18 specifically activated CD8(+) MAIT cells. Moreover, IL-18 together with T-cell receptor stimulation induced, specifically on CD8(+) MAIT cells, an upregulation of the integrin very late antigen-4 that is essential for the infiltration of CD8(+) T cells into the CNS. Notably, we were able to identify CD8(+) MAIT cells in MS brain lesions by immunohistochemistry while they were almost absent in the cerebrospinal fluid (CSF). In summary, our findings indicate that an IL-18-driven activation of CD8(+) MAIT cells contributes to their CNS infiltration in MS, in turn leading to reduced CD8(+) MAIT-cell frequencies in the blood. Therefore, CD8(+) MAIT cells seem to play a role in the innate arm of immunopathology in MS.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Subpopulações de Linfócitos T
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Linfócitos T CD8-Positivos
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Interleucina-18
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Esclerose Múltipla
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Eur J Immunol
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Alemanha