Function of the IL-2R for thymic and peripheral CD4+CD25 + Foxp3+ T regulatory cells

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133 Scopus citations


IL-2 contributes to the production, function, and homeostasis of CD4 +CD25+ Treg cells. However, it remains uncertain whether IL-2 is essential for the development of Treg cells in the thymus, their homeostasis in the periphery, or both. The present study was undertaken to investigate the contribution of IL-2 during thymic T reg cell development and its maintenance in peripheral immune tissue. Relying on genetic mouse models where IL-2R signaling was either completely blocked or selectively inhibited in peripheral CD4+CD25+ Treg cells, we show that the IL-2/IL-2R interaction is active in the thymus at the earliest stage of the development of Treg cells to promote their expansion and to up-regulate Foxp3 and CD25 to normal levels. Furthermore, CD4+CD25+Foxp3+ Treg cells with impaired IL-2-induced signaling persist in the periphery and control autoimmunity without constant thymic output. These peripheral Treg cells with poor responsiveness to IL-2 exhibited slower growth and extended survival in vivo, somewhat lower suppressive activity, and poor IL-2-dependent survival in vitro. Mixed thymic and bone marrow chimeric mice showed that wild-type-derived Treg cells were substantially more effective in populating peripheral immune tissue than Treg cells with impaired IL-2 signaling. Collectively, these data support the notion that normally IL-2 is a dominant mechanism controlling the number of thymic and peripheral T reg cells.

Original languageEnglish (US)
Pages (from-to)4062-4071
Number of pages10
JournalJournal of Immunology
Issue number7
StatePublished - Apr 1 2007

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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