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J. Exp. Med.,
Volume 188, Number 10, November 16, 1998 1859-1866
By


From the * Department of Immunology and Infectious Diseases, Harvard School of Public Health,
Boston, Massachusetts 02115; the The c-maf protooncogene is a T helper cell type 2 (Th2)-specific transcription factor that activates the interleukin (IL)-4 promoter in vitro. Although it has been postulated that c-maf directs the Th2-specific expression of the IL-4 gene in vivo, direct evidence that c-maf functions
during the differentiation of normal, primary T cells is lacking. We now demonstrate that overexpression of c-maf in vivo skews the Th immune response along a Th2 pathway, as evidenced by increased production of Th2 cytokines and the IL-4-dependent immunoglobulins,
IgG1 and IgE. The overproduction of IgGl and IgE in the CD4 promoter/c-maf transgenic
mice was IL-4 dependent since this was not observed in c-maf transgenic mice bred onto an
IL-4-deficient background. Ectopic expression of c-maf in mature Th1 cells did not confer on
them the ability to produce IL-4, but did decrease the production of IFN-
Department of Immunology and Rheumatology, Harvard Medical
School, Boston, Massachusetts 02115; and the § Department of Immunology, Scripps Research Institute,
La Jolla, California 92037
. The attenuation
of Th1 differentiation by c-maf overexpression occurred by a mechanism that was independent
of IL-4 and other Th2 cytokines, and could be overcome by IL-12. These studies demonstrate
that c-maf promotes Th2 differentiation by IL-4-dependent mechanisms and attenuates Th1
differentiation by Th2 cytokine-independent mechanisms.
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