Commitment of individual Th1-like lymphocytes to expression of IFN-gamma versus IL-4 and IL-10: selective induction of IL-10 by sequential stimulation of naive Th cells with IL-12 and IL-4
- PMID: 9743342
Commitment of individual Th1-like lymphocytes to expression of IFN-gamma versus IL-4 and IL-10: selective induction of IL-10 by sequential stimulation of naive Th cells with IL-12 and IL-4
Abstract
Commitment of Th lymphocytes to the Th1 phenotype, as characterized by the expression of the major proinflammatory cytokine IFN-gamma, may be critically involved in the establishment of chronic inflammation and inflammatory autoimmune disease. To date, it has been shown that in IL-12-stimulated murine Th cell lines containing a major fraction of Th1 cells, Th2 cells can be induced by IL-4 until about 2 wk after initial activation, but not later. Here we analyze, based on the magnetic isolation of viable Th1 cells according to their specific expression of IFN-gamma, the cytokine commitment of individual Th1 cells. After activation of naive Th cells with Ag and IL-12 for up to 5 wk, isolated IFN-gamma-producing cells were restimulated with Ag and IL-4. Within the first 3 to 4 wk of IL-12 stimulation, some IFN-gamma+ cells stopped expression of IFN-gamma when restimulated with IL-4. However, within only 1 to 2 wk of IL-12 stimulation, few IFN-gamma+ cells could be converted to produce IL-4. Others continued to express IFN-gamma and thus were already committed to a proinflammatory, Th1-like phenotype. Surprisingly, within 3 wk of IL-12 stimulation, many of the IFN-gamma-producing cells responded to IL-4 restimulation by expression of IL-10, but neither IFN-gamma nor IL-4, i.e., by conversion to a suppressive, anti-inflammatory phenotype.
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