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From the * Section of Immunobiology, Yale University School of Medicine, New Haven, Connecticut
06520-8011; Interleukin (IL)-4 is the most potent factor that causes naive CD4+ T cells to differentiate to
the T helper cell (Th) 2 phenotype, while IL-12 and interferon
Section of Rheumatology, Department of Internal Medicine, Yale University School of
Medicine, New Haven, Connecticut 06520-9031; and § Howard Hughes Medical Institute, Yale
University School of Medicine, New Haven, Connecticut 06520-8011
trigger the differentiation of
Th1 cells. However, the source of the initial polarizing IL-4 remains unclear. Here, we show
that IL-6, probably secreted by antigen-presenting cells, is able to polarize naive CD4+ T cells
to effector Th2 cells by inducing the initial production of IL-4 in CD4+ T cells. These results
show that the nature of the cytokine (IL-12 or IL-6), which is produced by antigen-presenting
cells in response to a particular pathogen, is a key factor in determining the nature of the immune response.
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