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Blood, 1 September 2007, Vol. 110, No. 5, pp. 1550-1558. Prepublished online as a Blood First Edition Paper on May 14, 2007; DOI 10.1182/blood-2007-01-069229.
IMMUNOBIOLOGY Human CD4+CD25+ regulatory T cells: proteome analysis identifies galectin-10 as a novel marker essential for their anergy and suppressive function1 Department of Dermatology, Johannes Gutenberg-University, Mainz, Germany; 2 Protagen AG, Dortmund, Germany; 3 Institute of Immunology, Johannes Gutenberg-University, Mainz, Germany; 4 Diaclone SAS, Besancon Cedex, France CD4+CD25+Foxp3+ regulatory T cells (CD25+ Treg cells) direct the maintenance of immunological self-tolerance by active suppression of autoaggressive T-cell populations. However, the molecules mediating the anergic state and regulatory function of CD25+ Treg cells are still elusive. Using differential proteomics, we identified galectin-10, a member of the lectin family, as constitutively expressed in human CD25+ Treg cells, while they are nearly absent in resting and activated CD4+ T cells. These data were confirmed on the mRNA and protein levels. Single-cell staining and flow cytometry showed a strictly intracellular expression of galectin-10 in CD25+ Treg cells. Specific inhibition of galectin-10 restored the proliferative capacity of CD25+ Treg cells and abrogated their suppressive function. Notably, first identified here as expressed in human T lymphocytes, galectin-10 is essential for the functional properties of CD25+ Treg cells.
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