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Blood, 15 September 2008, Vol. 112, No. 6, pp. 2554-2562. Prepublished online as a Blood First Edition Paper on July 3, 2008; DOI 10.1182/blood-2008-04-152041. This Article Full Text Full Text (PDF) Supplemental Figure All Versions of this Article: blood-2008-04-152041v1 112/6/2554    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Tu, W. Articles by Lewis, D. B. Search for Related Content PubMed PubMed Citation Articles by Tu, W. Articles by Lewis, D. B. Related Collections Immunobiology Transplantation Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  TRANSPLANTATION Efficient generation of human alloantigen-specific CD4+ regulatory T cells from naive precursors by CD40-activated B cells Wenwei Tu1, Yu-Lung Lau1, Jian Zheng1, Yinping Liu1, Ping-Lung Chan1, Huawei Mao1, Kira Dionis2, Pascal Schneider3, and David B. Lewis2 1 Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, PR China; 2 Department of Pediatrics and Program in Immunology, Stanford University School of Medicine, CA; and 3 Department of Biochemistry, University of Lausanne, Lausanne, Switzerland CD4+CD25+Foxp3+ regulatory T cells (Treg) play an important role in the induction and maintenance of immune tolerance. Although adoptive transfer of bulk populations of Treg can prevent or treat T cell–mediated inflammatory diseases and transplant allograft rejection in animal models, optimal Treg immunotherapy in humans would ideally use antigen-specific rather than polyclonal Treg for greater specificity of regulation and avoidance of general suppression. However, no robust approaches have been reported for the generation of human antigen-specific Treg at a practical scale for clinical use. Here, we report a simple and cost-effective novel method to rapidly induce and expand large numbers of functional human alloantigen-specific Treg from antigenically naive precursors in vitro using allogeneic nontransformed B cells as stimulators. By this approach naive CD4+CD25– T cells could be expanded 8-fold into alloantigen-specific Treg after 3 weeks of culture without any exogenous cytokines. The induced alloantigen-specific Treg were CD45RO+CCR7– memory cells, and had a CD4high, CD25+, Foxp3+, and CD62L (L-selectin)+ phenotype. Although these CD4highCD25+Foxp3+ alloantigen-specific Treg had no cytotoxic capacity, their suppressive function was cell-cell contact dependent and partially relied on cytotoxic T lymphocyte antigen-4 expression. This approach may accelerate the clinical application of Treg-based immunotherapy in transplantation and autoimmune diseases. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

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