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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/02/461/10 $2.00
Volume 185 February 1997 461-470

Interleukin (IL)-6 Directs the Differentiation of IL-4-producing CD4+ T Cells

By Mercedes Rincón,* Juan Anguita,Dagger Tetsuo Nakamura,*§ Erol Fikrig,Dagger and Richard A. Flavell*§

From the * Section of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520-8011; Dagger  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

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 gamma  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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