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CUTTING EDGE |
Production and Proliferation of CD8+ T Cells1



* Department of Immunology, Nagoya University Graduate School of Medicine, Nagoya, Japan;
Faculty of Medicine, Brawijaya University, Malang, East-Java, Indonesia; and
Japan Society for the Promotion of Science, Tokyo, Japan
We recently identified CD8+CD122+ regulatory T cells that directly control CD8+ and CD4+ cells without intervention of APCs. In this study, we investigated the effector mechanism of CD8+CD122+ regulatory T cells by using an in vitro regulation system. The profile of cytokine expression revealed that IL-10 was predominantly produced by CD8+CD122+ cells, whereas other cytokines were similarly expressed in CD8+CD122+ cells and CD8+CD122 cells. Suppression of both proliferation and IFN-
production by CD8+CD122 cells by CD8+CD122+ cells was blocked by adding anti-IL-10 Ab to the culture but not by adding anti-TGF-
Ab. When IL-10 was removed from the conditioned medium from CD8+CD122+ cells, the conditioned medium no longer showed regulatory activity. Finally, CD8+CD122+ cells from IL-10-deficient mice had no regulatory activity in vitro and reduced regulatory activity in vivo. Our results clearly indicate that IL-10 is produced by CD8+CD122+ cells and mediates the regulatory activity of these cells.
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