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*
Roche Milano Ricerche, Milan, Italy; and
Department of Inflammation/Autoimmune Diseases, Hoffmann-La Roche, Inc., Nutley, NJ 07110
Type I IFNs (IFN-
/ß), in addition to IL-12, have been shown to
play an important role in the differentiation of human, but not mouse,
Th cells. We show here that IFN-
/ß act directly on human T cells
to drive Th1 development, bypassing the need for IL-12-induced
signaling, whereas IFN-
cannot substitute IL-12 for mouse Th1
development. The molecular basis for this species specificity is that
IFN-
/ß activate Stat4 in differentiating human, but not mouse, Th
cells. Unlike IL-12, which acts only on Th1 cells, IFN-
/ß can
activate Stat4 not only in human Th1, but also in Th2 cells. However,
restimulation of human Th2 lines and clones in the presence of IFN-
does not induce the production of IFN-
. These results suggest that
activation of Stat4, which is necessary for the differentiation of
naive T cells into polarized Th1 cells, is not sufficient to induce
phenotype reversal of human Th2 cells.
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