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Section of Immunobiology, Yale University School of Medicine, and Howard Hughes Medical Institute, New Haven, CT 06520
The diversity of naive CD4 T cells plays an important role in the adaptive immune response by ensuring the capability of responding to novel pathogens. In the past, it has been generally accepted that naive CD4 T cells are intrinsically long-lived; however, there have been studies suggesting some CD4 T cells are short-lived. In this report, we identify two populations of naive CD4 T cells: a long-lived population as well as a short-lived population. In addition, we identify two factors that contribute to the establishment of long-lived naive CD4 T cells. We confirm earlier findings that MHC class II interaction with the TCR on CD4 T cells is important for survival. Furthermore, we find that MHC class II alleles with the correct restriction element for Ag presentation mediate the peripheral survival of naive CD4 T cells more efficiently than other positively selecting alleles, regardless of the selecting MHC in the thymus. The second component contributing to the survival of naive CD4 T cells is contact with the cytokines IL-4 and IL-7. We find that the physiological levels of IL-4 and IL-7 serve to enhance the MHC class II-mediated survival of naive CD4 T cells in vivo.
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