| Literature DB >> 17575072 |
Yu Yang1, Jordi C Ochando, Jonathan S Bromberg, Yaozhong Ding.
Abstract
T-bet plays a critical role in controlling IFNgamma expression, Th1 polarization, and CD8 cytolytic development. Its regulation has been demonstrated to be mostly IFNgamma/Stat1 dependent while IL-12/Stat4 independent. Here we show that IL-12/Stat4 binds to a distant highly conserved STAT-responsive T-bet enhancer, and induces IFNgamma/Stat1-independent T-bet expression in CD8 T cells. Luciferase reporter assay showed that both Stat4 and Stat1 activate reporter gene expression from constructs containing a wild-type but not mutated T-bet enhancer. Studies in virus-infected mice demonstrated that the IL-12/Stat4/T-bet cascade operates in vivo and regulates IFNgamma in CD8 T cells. Together, we provide a novel mechanism for T-bet regulation, and suggest that IL-12/Stat4/T-bet play an important role in CD8 effector responses.Entities:
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Year: 2007 PMID: 17575072 PMCID: PMC1988915 DOI: 10.1182/blood-2006-11-058271
Source DB: PubMed Journal: Blood ISSN: 0006-4971 Impact factor: 22.113