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J. Exp. Med.,
Volume 187, Number 8, April 20, 1998 1305-1313
By
From the Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National
Institutes of Health, Bethesda, Maryland 20892-1892
Cluster of differentation (CD)4+ T helper cells (Th)1s fail to produce interleukin (IL)-4. Even
if restimulated in the presence of IL-4, a condition that induces IL-4-producing capacity in naive CD4+ T cells, Th1s fail to become IL-4 producers. We report that Th1 cells have a major
impairment in IL-4 signaling. When compared to both Th2s and naive T cells, they display a
striking diminution in phosphorylation of Stat6. They also show reduced phosphorylation of
Janus kinase (JAK)-3 and insulin receptor substrate (IRS)-2 when compared to Th2s. Stat6 and
JAK-3 are present in equivalent amounts in Th1s and Th2s, but IRS-2 protein levels are much
lower in Th1s than in Th2s. Altered sensitivity to IL-4, the major inducer of the Th2 phenotype, may explain the stability of the Th1 state.
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