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Arthritis Res Ther. 2009;11(4):R128. doi: 10.1186/ar2795. Epub 2009 Aug 25.

Reduced Fas ligand-expressing splenic CD5+ B lymphocytes in severe collagen-induced arthritis.

Author information

1
Department of Internal Medicine, Division of Rheumatology, University of Michigan Medical School, Ann Arbor, MI 48109-2200, USA. sklundy@umich.edu

Abstract

INTRODUCTION:

The objective was to study immune regulation in a mouse model of rheumatoid arthritis that exhibits considerable heterogeneity of disease activity.

METHODS:

T-cell receptor transgenic mice, in which nearly all CD4+ T cells recognize a single peptide of type II collagen, were immunized with collagen and observed for development of arthritis for 4 weeks. At 28 days post-immunization, splenocytes were analyzed by flow cytometry and in vitro assays for markers of immune activation and regulation.

RESULTS:

Disease severities ranging from 0 to 12 (on a 12-point scale) were observed. Among splenic lymphocyte populations, only the CD5+ B-cell subset displayed a decrease in relative numbers as arthritis severity increased. Splenic CD5+ B cells expressed higher levels of Fas ligand (FasL) than did CD4+ T cells or CD5- B cells in all mice, and antigen-dependent T-cell death correlated with higher levels of CD5+ B cells in cocultures. Ratios of interleukin (IL)-17 to interferon-gamma production were higher in antigen-driven cultures of splenocytes from severely arthritic mice compared to mildly or nonarthritic mice. A correlation was established between the reduced production of IL-17 in antigen-driven T-cell/B-cell cocultures and FasL, but not IL-10. Confirmation of the direct killing effect of B cells on T cells was demonstrated using an antigen-specific T hybridoma cell line.

CONCLUSIONS:

Reduced numbers of splenic FasL+ CD5+ B cells correlated with increasing arthritis severity and decreased T-cell death in a T-cell receptor transgenic mouse model of collagen-induced arthritis. These 'killer' B cells may provide a novel mechanism for inducing T-cell death as a treatment for arthritis.

PMID:
19706160
PMCID:
PMC2745812
DOI:
10.1186/ar2795
[Indexed for MEDLINE]
Free PMC Article

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