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CD40-activated B cells are more potent than immature dendritic cells to induce and expand CD4+ regulatory T cells

Abstract

CD4+ regulatory T cells (Tregs) play an important role in maintaining immune tolerance by suppressing pathologic immune responses. The generation of large numbers of antigen-specific Tregs ex vivo is critical for the development of clinical immunotherapy based on the adoptive transfer of Tregs. Both CD40-activated B cells (CD40-B) and immature dendritic cells (imDCs) have been used as professional antigen-presenting cells (APCs) to generate antigen-specific Tregs. However, the efficiencies of CD40-B and imDCs to generate CD4+ Tregs have not been compared directly and the mechanism driving the generation of these Tregs remains largely unknown. In this study, we found that CD40-B exhibited mature phenotypes and were more able to induce and expand CD4highCD25+ Tregs than imDCs. Moreover, Tregs induced by CD40-B had greater suppressive capacity than those induced by imDCs. The generation of CD4highCD25+ Tregs by CD40-B and imDCs is cell–cell contact dependent and partially relies on the expression of human leukocyte antigen (HLA)-DR and CD80/86. Differences in CD4highCD25+ Treg generation efficiency were largely explained by the production of endogenous IL-2 by CD40-B. Our results suggest that CD40-B is better able to generate large numbers of antigen-specific Tregs than imDCs. Additionally, using CD40-B to generate Tregs may accelerate the clinical use of Treg-based immunotherapy in the treatment of allograft rejection, graft versus host disease (GVHD) and autoimmune diseases.

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Acknowledgements

This work was supported in part by the Seed Funding for Basic Research, University Research Committee, the University of Hong Kong (HKU), Hong Kong, China (WT); General Research fund, Research Grants Council of Hong Kong, Hong Kong, China (WT); the Area of Excellence Scheme of the University Grants Committee, Hong Kong, China (Grant AoE/M-12/06; WT and YLL); Edward Sai-Kim Hotung Paediatric Education and Research Fund (YLL, WT) and HKU postgraduate studentships (JZ).

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Correspondence to Yu-Lung Lau or Wenwei Tu.

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Zheng, J., Liu, Y., Lau, YL. et al. CD40-activated B cells are more potent than immature dendritic cells to induce and expand CD4+ regulatory T cells. Cell Mol Immunol 7, 44–50 (2010). https://doi.org/10.1038/cmi.2009.103

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