Volume 50, Issue 1 pp. 305-313
Research Article

Suppression of collagen-induced arthritis by natural killer T cell activation with OCH, a sphingosine-truncated analog of α-galactosylceramide

Asako Chiba

Asako Chiba

National Institute of Neuroscience, NCNP and Juntendo University School of Medicine, Tokyo, Japan

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Shinji Oki

Shinji Oki

National Institute of Neuroscience, NCNP, Tokyo, Japan

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Katsuichi Miyamoto

Katsuichi Miyamoto

National Institute of Neuroscience, NCNP, Tokyo, Japan

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Hiroshi Hashimoto

Hiroshi Hashimoto

Juntendo University School of Medicine, Tokyo, Japan

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Takashi Yamamura

Takashi Yamamura

National Institute of Neuroscience, NCNP, Tokyo, Japan

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Sachiko Miyake

Corresponding Author

Sachiko Miyake

National Institute of Neuroscience, NCNP, Tokyo, Japan

Department of Immunology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawahigashi, Kodaira, Tokyo 187-8502, JapanSearch for more papers by this author
First published: 09 January 2004
Citations: 139

Abstract

Objective

OCH, a synthetic analog of α-galactosylceramide with a truncated sphingosine chain, stimulates natural killer T (NKT) cells to produce predominantly Th2 cytokines. Thus, OCH may be a potential agent for the treatment of Th1-mediated autoimmune diseases. This study was designed to evaluate the protective effects of OCH on collagen-induced arthritis (CIA) in mice.

Methods

Mice were immunized with type II collagen (CII) and injected intraperitoneally twice per week with OCH, before or after the onset of CIA. They were monitored to assess the effect of OCH treatment on the severity of disease. Anti-CII antibodies and cytokine production were measured by enzyme-linked immunosorbent assay. Expression of cytokine genes was determined by quantitative reverse transcriptase–polymerase chain reaction.

Results

OCH inhibited CIA in wild-type C57BL/6 (B6) mice but not in NKT-deficient mice. OCH suppressed CIA in SJL mice, which are prone to autoimmune diseases and have a deficiency in the number and function of NKT cells which is similar to that in patients with autoimmune diseases, even after disease has already developed. Disease protection conferred by OCH correlated with its ability to selectively induce Th2 cytokine production mediated by NKT cells and to promote collagen-specific Th2 responses. Neutralization of interleukin-4 (IL-4) or IL-10 with monoclonal antibodies abolished disease protection by OCH, indicating a critical role for these cytokines.

Conclusion

Taken together, our findings suggest that OCH holds possibilities as a therapeutic agent for autoimmune diseases such as rheumatoid arthritis.

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