Role of regulatory T cells in a new mouse model of experimental autoimmune myositis. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue American Journal of Pathology Année : 2009

Role of regulatory T cells in a new mouse model of experimental autoimmune myositis.

Résumé

Polymyositis is a rare and severe inflammatory muscle disorder. Treatments are partially efficacious but have many side effects. New therapeutic approaches must be first tested in a relevant animal model. Regulatory CD4+CD25+ T cells (Tregs) have been rediscovered as a pivotal cell population in the control of autoimmunity, but the connection between polymyositis and Tregs is currently unknown. To develop a reproducible experimental autoimmune myositis model of polymyositis, mice were immunized once a week for 3 weeks with 1 mg of partially purified myosin emulsified in complete Freund's adjuvant. All mice injected with myosin and complete Freund's adjuvant developed myositis. The infiltrates were composed of CD4(+) and CD8(+) cells, as well as macrophages, but did not contain B lymphocytes. In mice that were depleted of Tregs, the myositis was more severe, as determined by quantitative scoring of muscle inflammation (2.36 +/- 0.9 vs. 1.64 +/- 0.8, P = 0.019). In contrast, injection of in vitro expanded polyclonal Tregs at the time of immunization significantly improved the disease (quantitative score of inflammation 0.87 +/- 1.06 vs. 2.4 +/- 0.67, P = 0.047). Transfer of sensitized or CD4(+)-sorted cells from the lymph nodes of experimental autoimmune myositis mice induced myositis in naïve, irradiated, recipient mice. Thus, experimental autoimmune myositis is a reproducible, transferable disease in mice, both aggravated by Treg depletion and improved by polyclonal Treg injection.

Domaines

Immunothérapie

Dates et versions

hal-00420196 , version 1 (28-09-2009)

Identifiants

Citer

Yves Allenbach, Sounkary Solly, Sylvie Grégoire, Odile Dubourg, Benoit Salomon, et al.. Role of regulatory T cells in a new mouse model of experimental autoimmune myositis.. American Journal of Pathology, 2009, 174 (3), pp.989-98. ⟨10.2353/ajpath.2009.080422⟩. ⟨hal-00420196⟩
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