Decreasing the threshold for thymocyte activation biases CD4+ T cells toward a regulatory (CD4+CD25+) lineage

Geoffrey L. Stephens, Leszek Ignatowicz

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Thymus-derived CD4+CD25+ regulatory T (Tr) cells play a critical role in suppressing aberrant responses to self in vivo. The factors that influence a CD4+ T cell's decision to commit to an immunoregulatory Tr cell lineage are currently unknown. In the present study, we found that in mice, abundantly expressing a few or one peptide(s) bound to MHC class II molecules, a large portion of conventional CD4+ T cells could be biased towards the commitment to a Tr lineage by reducing the threshold required for thymocyte activation. This occurred in the presence of either an antisense glucocorticoid receptor transgene or a pharmacological inhibitor of glucocorticoid synthesis. These results demonstrate a novel in vivo pathway for the generation of Tr cells, and raise the possibility that therapeutic enhancement of the Tr cell repertoire through pharmacological manipulation of TCR signaling thresholds may provide a feasible means of ameliorating autoimmunity.

Original languageEnglish (US)
Pages (from-to)1282-1291
Number of pages10
JournalEuropean Journal of Immunology
Issue number5
StatePublished - May 1 2003
Externally publishedYes


  • CDRCD25
  • Regulatory
  • Selection
  • T cell
  • Thymus

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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