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Theses

Recherche de thérapies innovantes dans un modèle murin de myopathies inflammatoires

Abstract : Inflammatory myopathies are acquired diseases characterized by motor deficit involving an autoimmune myopathy.They are responsible for impairing disability and may be associated with life-threatening complications.Treatment, when they exist, based on the use of corticosteroids in high doses and for long periods.However, 60 % of patients relapse and 20-30 % are readily corticosteroid.Other immunosuppressive treatments are then required (methotrexate , azathioprime , cyclosporine).The side effects of these treatments are inevitable and sometimes severe, which is why the development of new approaches treatment is essential. To test these new approaches, the laboratory developed a mouse model of Experimental Autoimmune Myositis with same Clinical and histological characteristics to polymyositis.In this model we tested the effect of a sub-population of T lymphocyte, nammed regulatory T cells, plays a crucial role in peripheral tolerance self-antigens. In order to control autoimmune manifestations that can replicate the mechanisms of action of Tregs , we sought to amplify in vivo, pharmacologically.At first, we observed the beneficial effect of rapamycin on our model, notably with increase of Tregs.In a second step, we have shown the beneficial role IVIg in the same model in curative.Finally, we investigated the effect of arsenic trioxide ( Trisenox ) in this animal model.Thus, all these data provide insight into the pathophysiology of myositis and to develop a clinical trial with rapamycin .
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Nicolas Prevel. Recherche de thérapies innovantes dans un modèle murin de myopathies inflammatoires. Immunologie. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066569⟩. ⟨tel-01333630⟩

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