Volume 13, Issue 5 pp. 547-556
Original Article

Therapeutic effects of roxithromycin in interleukin-10-deficient colitis

Hiroshi Tamagawa MD, PhD

Hiroshi Tamagawa MD, PhD

Department of Surgery, Osaka University Graduate School of Medicine, Osaka, Japan

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Takachika Hiroi DDS, PhD

Takachika Hiroi DDS, PhD

Division of Mucosal Immunology, Department of Microbiology and Immunology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan

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Tsunekazu Mizushima MD, PhD

Tsunekazu Mizushima MD, PhD

Department of Surgery, Osaka University Graduate School of Medicine, Osaka, Japan

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Toshinori Ito MD, PhD

Toshinori Ito MD, PhD

Department of Surgery, Osaka University Graduate School of Medicine, Osaka, Japan

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Hikaru Matsuda MD, PhD

Hikaru Matsuda MD, PhD

Department of Surgery, Osaka University Graduate School of Medicine, Osaka, Japan

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Hiroshi Kiyono DDS, PhD

Corresponding Author

Hiroshi Kiyono DDS, PhD

Division of Mucosal Immunology, Department of Microbiology and Immunology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan

CREST, Japan Science and Technology Agency, Tokyo, Japan

Division of Mucosal Immunology, Department of Microbiology and Immunology, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai Minato-Tokyo, 108-8639, JapanSearch for more papers by this author
First published: 23 January 2007

Abstract

Background: A limited number of therapeutic strategies are currently available to treat patients with inflammatory bowel disease (IBD). Interleukin-10 (IL-10)—deficient mice, well characterized as an experimental model of IBD, develop severe chronic colitis because of aberrant Th1 responses. Roxithromycin (RXM), a macrolide antibiotic, has received attention because it offers not only antibacterial but also immunosuppressive effects. We examined the immunosuppressive effect of RXM on the development of IBD.

Methods: To test the efficacy of short-term administration of RXM, elder IL-10-deficient mice (16–20 weeks old) with established colitis were orally treated for 10 days with RXM (20 mg/kg per day). To test the long-term preventive effects of RXM, for 20 weeks young adult IL-10-deficient mice (4–5 weeks old) also were administered RXM orally (20 mg/kg per day).

Results: The short-term treatment-oriented administration of RXM reduced the degree of inflammatory change and lowered serum amyloid A in IL-10-deficient mice with severe colitis. Mononuclear cells from the lamina propria of RXM-treated large intestines showed lower production of IFN-γ than did those from diseased mice that were untreated. Long-term prevention-oriented administration of RXM suppressed the development of severe colitis and decreased production of IFN-γ and IL-12. In addition to its expected immunosuppressive effect, RXM treatment also decreased the level of Bacteroides vulgatus, a Gram-negative anaerobe.

Conclusions: The anti-inflammatory changes observed in IL-10-deficient mice resulted from the efficacy of RXM as an immunosuppressant as well as from its efficacy as an antibiotic. According to our findings, RXM would seem to have significant potential as a preventive and/or therapeutic agent for IBD.

(Inflamm Bowel Dis 2007)

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