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© Research
Publication : Journal of immunology (Baltimore, Md. : 1950)

Agonist-driven development of CD4+CD25+Foxp3+ regulatory T cells requires a second signal mediated by Stat6

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of immunology (Baltimore, Md. : 1950) - 15 Jun 2007

Sanchez-Guajardo V, Tanchot C, O'Malley JT, Kaplan MH, Garcia S, Freitas AA

Link to Pubmed [PMID] – 17548589

J. Immunol. 2007 Jun;178(12):7550-6

The factors that induce Foxp3 expression and regulatory T (Treg) cell development remain unknown. In this study, we investigated the role of STAT4 and STAT6 in agonist-driven generation of Ag-specific Foxp3-expressing Treg cells. Our findings indicate that fully efficient induction of Foxp3 expression and development of Ag-specific Treg cells requires the synergistic action of two signals: a TCR-mediated signal and a second signal mediated by STAT6. Indeed, by comparing the development of wild-type and STAT4- and STAT6-deficient hemagglutinin-specific T cells in the presence of hemagglutinin Ag, we found that the absence of STAT6 impaired the generation of Ag-specific CD4+CD25+Foxp3+ cells. Moreover, in transgenic mice expressing a constitutively active form of STAT6, we found that the fraction of CD4+Foxp3+ cells exceeds that of control wild-type littermates. Overall these findings support a role for the STAT6 pathway in Treg cell development and maintenance.

http://www.ncbi.nlm.nih.gov/pubmed/17548589