Role of CD8+ CD25+ Foxp3+ regulatory T cells in multiple sclerosis.

Abstract:

OBJECTIVE:The objective of this study was to investigate the role of CD8+ CD25+ FoxP3+ cells during the course of multiple sclerosis (MS). METHODS:Peripheral blood and cerebrospinal fluid (CSF) CD8+ T-cell clones (TCCs) recognizing autoreactive CD4+ T cells were isolated from 20 MS patients during exacerbations, 15 patients in remission, 15 healthy subjects, and 10 patients with other inflammatory neurological diseases. Characteristics of noncytotoxic CD8+ CD25+ regulatory T cells were studied. Cell phenotype was evaluated using flow cytometry. Cytokine production and phospho-signal transducer and activator of transcription 3 (STAT3) concentration were determined using enzyme-linked immunosorbent assay. To assess 2,3-dioxygenase (IDO) activity on dendritic cells (DCs), kynurenine concentration was measured by high-performance liquid chromatography. RESULTS:Inhibition of CD4+ self-reactive T-cell proliferation, and of interferon-gamma and interleukin (IL)-17 secretion, was observed after adding CD8+ CD25+ FoxP3+ cells to cultures. Suppression was abrogated by silencing FoxP3 using small interfering RNA. Cells were CD122+, CTLA-4+, GITR+, CCR7+, and CD62L+, producing IL-10 and transforming growth factor-beta. CD8+ CD25+ FoxP3+ cells downregulated costimulatory molecule expression on dendritic cells through a STAT3-mediated pathway, resulting in less efficient antigen presentation, and induced IDO expression on DCs through STAT3 and cytotoxic T-lymphocyte antigen 4-dependent mechanisms. CD8+ regulatory TCC cloning frequency studied in blood and CSF was suppressed to a greater degree during exacerbations than during remission or in controls. Likewise, in CSF of MS patients during acute exacerbations, lower levels of CD8+ CD25+ FoxP3+ T cells were detected using flow cytometry. INTERPRETATION:CD8+ CD25+ FoxP3+ cells are novel regulatory cells exerting significant influence over self-reactive CD4+ T-cell regulation during the course of MS. Induction of these cells may provide new therapeutic alternatives for MS by eliminating or inhibiting self-reactive T cells.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Correale J,Villa A

doi

10.1002/ana.21944

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

625-38

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

67

pub_type

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