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Th cell subsets, namely Th1 and Th2 cells, play an important role in mounting an immune response against invading pathogens. Several genes are selectively up-regulated during differentiation and effector phases of Th subsets. In this study, we report the identification of a novel cytokine-like molecule designated FISP (IL-4-induced secreted protein), which is selectively expressed and secreted by Th2 cells. Detectable levels of FISP are observed only 3 days after initiation of Th2 differentiation. Expression of FISP in developing Th cells requires at least two signals: TCR signaling involving protein kinase C activation and STAT6-dependent IL-4R signaling.
Schaefer et al. (Tue,) studied this question.
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