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Blood, 15 October 2007, Vol. 110, No. 8, pp. 2983-2990.
Prepublished online as a Blood First Edition Paper on July 20, 2007; DOI 10.1182/blood-2007-06-094656.
Previous Article | Next Article 
Submitted June 7, 2007
Accepted July 11, 2007
Induction of FOXP3 expression in naive human CD4+FOXP3- T cells by T cell receptor stimulation is TGF -dependent but does not confer a regulatory phenotype
Dat Q. Tran, Heather Ramsey, and Ethan M. Shevach*
Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
* Corresponding author; email: eshevach{at}niaid.nih.gov.
Thymic-derived natural T regulatory cells (nTreg) are important for the induction of self-tolerance and the control of autoimmunity. Murine CD4+CD25-Foxp3- cells can be induced to express Foxp3 following T cell receptor (TCR) activation in the presence of TGF and are phenotypically similar to nTreg. Some studies have suggested that TCR stimulation of human CD4+CD25- cells results in the induction of transient expression of FOXP3, but that the induced cells lack a regulatory phenotype. We demonstrate here that TCR stimulation alone was insufficient to induce FOXP3 expression in the absence of TGF , while high levels of FOXP3 expression could be induced in the presence of TGF . Although FOXP3 expression was stable, the TGF -induced FOXP3+ T cells were neither anergic nor suppressive and produced high levels of effector cytokines. These results suggest that even high levels of FOXP3 expression are insufficient to define a human CD4+ T cell as a T regulatory cell.

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D. Q. Tran and E. M. Shevach
Response: Anti human FOXP3 mAb PCH101 stains activated human naive T cells nonspecifically
Blood,
January 1, 2008;
111(1):
464 - 466.
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