The Journal of Experimental Medicine
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Published 21 July 2003. doi:10.1084/jem.20030315
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© Rockefeller University Press, 0022-1007/2003/7/249 $5.00
The Journal of Experimental Medicine, Volume 198, Number 2, 249-258

Antigen-dependent Proliferation of CD4+ CD25+ Regulatory T Cells In Vivo

Lucy S.K. Walker, Anna Chodos, Mark Eggena, Hans Dooms and Abul K. Abbas

Department of Pathology, University of California San Francisco, San Francisco, CA 94143

Address correspondence to Lucy S.K. Walker, MRC Centre for Immune Regulation, University of Birmingham Medical School, Vincent Drive, Birmingham B15 2TT, United Kingdom. Phone: 44-121-414-6854; Fax: 44-121-414-3599; E-mail: L.S.Walker{at}bham.ac.uk

The failure of CD25+ regulatory T cells (Tregs) to proliferate after T cell receptor (TCR) stimulation in vitro has lead to their classification as naturally anergic. Here we use Tregs expressing a transgenic TCR to show that despite anergy in vitro, Tregs proliferate in response to immunization in vivo. Tregs also proliferate and accumulate locally in response to transgenically expressed tissue antigen whereas their CD25- counterparts are depleted at such sites. Collectively, these data suggest that the anergic state that characterizes CD25+ Tregs in vitro may not accurately reflect their responsiveness in vivo. These observations support a model in which Treg population dynamics are shaped by the local antigenic environment.

Key Words: CD4+ T lymphocytes • peripheral tolerance • autoantigen • regulatory T cells • autoimmunity


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