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Increased expression and activation of IL-12-induced Stat4 signaling in the mucosa of ulcerative colitis patients

机译:溃疡性结肠炎患者黏膜中IL-12诱导的Stat4信号的表达和激活增加

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Inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), are chronic inflammatory diseases with unsolved pathogenesis. Imbalanced Th1/Th2 may play a role in the sustained inflammation of IBD. In China, CD is rare but the incidence of UC has been rising steadily in the last two decades. We investigated the expression of IL-12 (p40) and IFN-gamma, and the activational state of Stat4 signaling in mucosal tissues at the site of disease from 30 active UC patients in comparison with 30 healthy controls. RT-PCR analyses revealed increased mRNA expression of IL-12 (p40) but not IFN-gamma in UC patients. Western blot analyses discovered, for the first time, increased levels of constitutive Stat4 in the cytoplasm and phosphorylated Stat4 in the nucleus of mucosal cells from UC patients. We conclude that a heightened, perhaps persistent, activational state of IL-12/Stat4, and/or IL-23/Stat4 signaling may be present in active Chinese UC patients, and possibly involved in chronic inflammation in UC. (C) 2007 Elsevier Inc. All rights reserved.
机译:包括克罗恩病(CD)和溃疡性结肠炎(UC)在内的炎症性肠病(IBD)是发病机制尚未解决的慢性炎症性疾病。 Th1 / Th2失衡可能在IBD持续炎症中起作用。在中国,CD很少见,但近二十年来UC的发病率一直在稳步上升。我们调查了30名活跃的UC患者与30名健康对照者相比,病灶处粘膜组织中IL-12(p40)和IFN-γ的表达以及Stat4信号的激活状态。 RT-PCR分析显示,UC患者中IL-12(p40)的mRNA表达增加,而IFN-γ则没有。蛋白质印迹分析首次发现,来自UC患者的粘膜细胞质中的Stat4组成型水平升高,而细胞核中的Stat4磷酸化水平升高。我们得出的结论是,活跃的中国UC患者可能存在IL-12 / Stat4和/或IL-23 / Stat4信号转导升高的状态,可能是持续的,并且可能参与了UC的慢性炎症。 (C)2007 Elsevier Inc.保留所有权利。

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