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The precise immunologic functions of CD1d-restricted, CD161+ AV24AJ18 (Valpha24JalphaQ) T cells are not well defined, although production of IL-4 has been suggested as important for priming Th2 responses. However, activation of human Valpha24JalphaQ T cell clones by anti-CD3 resulted in the secretion of multiple cytokines notably important for the recruitment and differentiation of myeloid dendritic cells. Specific activation of Valpha24JalphaQ T cells was CD1d restricted. Expression of CD1d was found on monocyte-derived dendritic cells in vitro, and immunohistochemical staining directly revealed CD1d preferentially expressed on dendritic cells in the paracortical T cell zones of lymph nodes. Moreover, myeloid dendritic cells both activated Valpha24JalphaQ T cells and were susceptible to lysis by these same regulatory T cells. Because myeloid dendritic cells are a major source of IL-12 and control Th1 cell differentiation, their elimination by lysis is a mechanism for limiting the generation of Th1 cells and thus regulating Th1/Th2 responses.

the journal of immunology/the journal of immunology

CD1d on Myeloid Dendritic Cells Stimulates Cytokine Secretion from and Cytolytic Activity of Vα24JαQ T Cells: A Feedback Mechanism for Immune Regulation