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or IL-4



*
Lautenberg Center for General and Tumor Immunology, Hebrew University-Hadassah Medical School, Jerusalem, Israel; and
Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
Naive CD4 T cells acquire the potential to produce IFN-
and IL-4
by culture in the presence of their cognate Ag, APC, and appropriate
cytokines. In this study, we show that commitment to IFN-
production
on the part of rigorously purified naive CD4 T cells can occur without
cell division. Indeed, even entry into S phase is not essential.
Moreover, both CD4 and CD4/CD8 thymocytes from TCR-transgenic mice
(5CC7 mice) on a Rag2-/- background can
acquire IFN-
-producing capacity when stimulated by peptide, APC, and
IL-12. These cells can do so without dividing and some acquire
IFN-
-producing activity without entry into S phase. Not only is cell
division not required for acquisition of cytokine-producing potential,
cell populations that have undergone the same numbers of divisions can
have quite different proportions of IFN-
- or IL-4-producing cells,
depending on the duration of priming or, in the case of IL-4, on the
concentration of peptide. Thus, cell division is not a clock for the
expression of these cytokines. Factors associated with priming
conditions including strength of stimulation, duration of priming, and
number of divisions each play a role.
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