In vitro-expanded antigen-specific regulatory T cells suppress autoimmune diabetes |
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Authors: | Tang Qizhi Henriksen Kammi J Bi Mingying Finger Erik B Szot Greg Ye Jianqin Masteller Emma L McDevitt Hugh Bonyhadi Mark Bluestone Jeffrey A |
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Affiliation: | UCSF Diabetes Center, University of California San Francisco, 94143, USA. |
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Abstract: | The low number of CD4+ CD25+ regulatory T cells (Tregs), their anergic phenotype, and diverse antigen specificity present major challenges to harnessing this potent tolerogenic population to treat autoimmunity and transplant rejection. In this study, we describe a robust method to expand antigen-specific Tregs from autoimmune-prone nonobese diabetic mice. Purified CD4+ CD25+ Tregs were expanded up to 200-fold in less than 2 wk in vitro using a combination of anti-CD3, anti-CD28, and interleukin 2. The expanded Tregs express a classical cell surface phenotype and function both in vitro and in vivo to suppress effector T cell functions. Most significantly, small numbers of antigen-specific Tregs can reverse diabetes after disease onset, suggesting a novel approach to cellular immunotherapy for autoimmunity. |
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Keywords: | autoimmunity tolerance CD4+CD25+ T cells NOD mice immunoregulation |
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