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Blood, 1 February 2008, Vol. 111, No. 3, pp. 1726-1734. Prepublished online as a Blood First Edition Paper on November 19, 2007; DOI 10.1182/blood-2007-08-106526. This Article Full Text Full Text (PDF) All Versions of this Article: blood-2007-08-106526v1 111/3/1726    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 HighWire Citing Articles via CrossRef Google Scholar Articles by Ruzek, M. C. Articles by Garman, R. D. PubMed PubMed Citation Articles by Ruzek, M. C. Articles by Garman, R. D. Related Collections Transplantation Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  TRANSPLANTATION Characterization of in vitro antimurine thymocyte globulin–induced regulatory T cells that inhibit graft-versus-host disease in vivo Melanie C. Ruzek1, James S. Waire1, Deborah Hopkins2, Gina LaCorcia3, Jennifer Sullivan4, Bruce L. Roberts2, Susan M. Richards1, Sharon R. Nahill3, John M. Williams3, Abraham Scaria4, John Dzuris3, Srinivas Shankara2, and Richard D. Garman1 1 Immunology and Clinical Laboratory Sciences, Biologics R&D, 2 Applied Genomics, Science Research, 3 Immune Mediated Disease Biology, Science Research, and 4 Molecular Biology, Science Research, Genzyme, Framingham, MA Antithymocyte/antilymphocyte globulins are polyclonal antihuman T-cell antibodies used clinically to treat acute transplant rejection. These reagents deplete T cells, but a rabbit antihuman thymocyte globulin has also been shown to induce regulatory T cells in vitro. To examine whether antithymocyte globulin–induced regulatory cells might be functional in vivo, we generated a corresponding rabbit antimurine thymocyte globulin (mATG) and tested its ability to induce regulatory cells in vitro and whether those cells can inhibit acute graft-versus-host disease (GVHD) in vivo upon adoptive transfer. In vitro, mATG induces a population of CD4+CD25+ T cells that express several cell surface molecules representative of regulatory T cells. These cells do not express Foxp3 at either the protein or mRNA level, but do show suppressive function both in vitro and in vivo when adoptively transferred into a model of GVHD. These results demonstrate that in a murine system, antithymocyte globulin induces cells with suppressive activity that also function in vivo to protect against acute GVHD. Thus, in both murine and human systems, antithymocyte globulins not only deplete T cells, but also appear to generate regulatory cells. The in vitro generation of regulatory cells by anti-thymocyte globulins could provide ad-ditional therapeutic modalities for immune-mediated disease. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: X. Feng, S. Kajigaya, E. E. Solomou, K. Keyvanfar, X. Xu, N. Raghavachari, P. J. Munson, T. M. Herndon, J. Chen, and N. S. Young Rabbit ATG but not horse ATG promotes expansion of functional CD4+CD25highFOXP3+ regulatory T cells in vitro Blood, April 1, 2008; 111(7): 3675 - 3683. [Abstract] [Full Text] [PDF]

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