期刊
JOURNAL OF IMMUNOLOGY
卷 201, 期 7, 页码 1899-1906出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1701502
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资金
- Ministry of Education, Culture, Sports, Science and Technology [15K08119, 15K09538]
- Hyogo College of Medicine
- Grants-in-Aid for Scientific Research [15K08119, 15K09538] Funding Source: KAKEN
IL-2 induces regulatory T cells (Tregs) and reduces disease severity, such as in graft-versus-host disease and systemic lupus erythematosus. To investigate the regulatory network of IL-2 in rheumatoid arthritis, we examined the effects of IL-2-anti-IL-2 mAb immune complexes (IL-2ICs) in a rheumatoid arthritis model of collagen-induced arthritis (CIA). CIA was induced in male DBA/1 mice by two immunizations with type II collagen at 3-wk intervals. IL-2ICs were prepared by mixing 5 mu g of an anti-IL-2 mAb (clone JES6-1D) with 1 mu g of mouse IL-2 and were injected i.p. every day for 3 d. Mouse paws were scored for arthritis using a macroscopic scoring system. Th1, Th2, Th17, and Tregs were analyzed by flow cytometry. Joint histopathology was examined by H&E and immunohistochemical staining. Treg functions were examined by studying in vitro suppression using flow cytometry. IL-2IC administration effectively elicited a 1.6-fold expansion of CD4(+) Foxp3(+) Tregs in peripheral blood cells relative to that found in control mice. IL-2IC treatment significantly inhibited arthritis in CIA mice. Histopathological examination of joints revealed inhibited synovial cell proliferation and IL-17, IL-6, and TNF-alpha levels but increased Foxp3(+) Tregs after IL-2IC treatment. Flow cytometric examination of spleen cells revealed reduced IFN-gamma- and IL-17-producing cells and increased IL-10-producing Tregs after IL-2IC treatment. The suppressive activities of CD4(+) CD25(+) Tregs induced by IL-2ICs were stronger than those in untreated mice. IL-2ICs inhibited arthritis by augmenting not only Treg numbers but also Treg functions, which play regulatory roles in autoimmune arthritis.
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