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*
Deutsches Rheumaforschungszentrum, Berlin, Germany;
Millennium Pharmaceuticals, Cambridge, MA 02139;
Department of Parasitology, Leiden University, Leiden, The Netherlands; and
§
Universitätsklinikum Charité, Berlin, Germany
Th cells are categorized into subsets based on the cytokine production of in vitro-differentiated Th populations. For in vivo-differentiated Th subsets, little is known about the heterogeneity of cytokine production in single cells. We recently described a molecule, T1/ST2, that is preferentially expressed on the surface of Th2 cells. Here we combined high-gradient magnetic cell separation with four-color single-cell cytometry to analyze simultaneously three intracellular cytokines and T1/ST2 surface expression on CD4+ cells from lungs containing granulomas induced by Schistosoma mansoni eggs. T1/ST2 was highly up-regulated on CD4+ T cells from hepatic granulomas and granulomatous lungs. T1/ST2+ cells from granulomatous lungs preferentially produced type 2 cytokines ex vivo. In the total CD4+ population, coexpression of type 1 and type 2 cytokines occurred frequently. However, such coproduction was drastically reduced in T1/ST2+ cells compared with T1/ST2- cells. Coexpression of type 1 and type 2 cytokines was also rare in cells simultaneously producing two cytokines of one type. These findings indicate that individual CD4+ T cells in vivo have different levels of commitment to a certain Th phenotype. Coexpression of two type 2 cytokines or production of one type 2 cytokine together with surface expression of T1/ST2 indicate advanced commitment to the Th2 phenotype.
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