Nucleotide oligomerization domain-2 (NOD2)-induced uveitis: dependence on IFN-gamma.

Nucleotide oligomerization domain-2 (NOD2)-induced uveitis: dependence on IFN-gamma.
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DOI:
10.1167/iovs.08-2756
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发表时间:
2009-04
影响因子:
4.4
通讯作者:
Rosenbaum JT
Rosenbaum JT
中科院分区:
医学2区
文献类型:
--
作者:
Rosenzweig HL;Kawaguchi T;Martin TM;Planck SR;Davey MP;Rosenbaum JT

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核苷酸寡聚化结构域 2 (NOD2) 在感知壁酰二肽 (MDP)(细菌细胞壁的一种成分)的先天免疫中发挥着重要作用。值得注意的是,NOD2 与眼部炎症有关,因为 NOD2 突变会导致称为布劳综合征的肉芽肿型葡萄膜炎。采用 NOD2 依赖性眼部炎症小鼠模型来测试与肉芽肿形成密切相关的细胞因子 IFN-γ 的作用,以便深入了解 NOD2 激活在眼睛内触发葡萄膜炎的下游功能后果。在存在或不存在 IFN-γ 的情况下,对缺乏 IFN-γ、NOD2 或 CD11b 的小鼠及其野生型对照进行玻璃体内注射 MDP 治疗。通过 ELISA 测量眼睛中 IFN-γ 的产生。通过活体显微镜量化虹膜内的血管内炎症反应。 NOD2 激活导致眼内产生 IFN-γ。 IFN-γ 的缺乏减少了 MDP 诱导的葡萄膜炎的发展,表明它在 NOD2 触发的下游炎症事件中发挥着至关重要的作用。此外,外源性 IFN-γ 通过 NOD2 依赖性机制显着加剧 MDP 诱导的眼部炎症。 IFN-γ 增强炎症的潜力需要粘附分子 CD11b,因为 CD11b 缺陷小鼠未能表现出 IFN-γ 和 MDP 共治疗对粘附和浸润细胞的协同作用。 IFN-γ 被确定为 NOD2 驱动的炎症的下游介质,并且证明了 IFN-γ 在体内增强 NOD2 炎症潜力的能力。对小鼠的这些发现进行推断表明,布劳综合征患者可能出现 IFN-γ 失调,从而导致该疾病的肉芽肿性质。
Nucleotide oligomerization domain-2 (NOD2) plays an important role in innate immunity to sense muramyl dipeptide (MDP), a component of bacterial cell walls. Notably, NOD2 is linked to eye inflammation because mutations in NOD2 cause a granulomatous type of uveitis called Blau syndrome. A mouse model of NOD2-dependent ocular inflammation was employed to test the role of a cytokine strongly implicated in granuloma formation, IFN-γ, in order to gain insight into downstream functional consequences of NOD2 activation within the eye triggering uveitis. Mice deficient in IFN-γ, NOD2, or CD11b and their wild-type controls were treated with intravitreal injection of MDP in the presence or absence of IFN-γ. IFN-γ production in the eye was measured by ELISA. The intravascular inflammatory response within the iris was quantified by intravital microscopy. NOD2 activation resulted in the production of IFN-γ within the eye. Deficiency in IFN-γ diminished the development of MDP-induced uveitis, indicating its crucial role in downstream inflammatory events triggered by NOD2. Moreover, exogenous IFN-γ markedly exacerbated MDP-induced ocular inflammation in a NOD2-dependent mechanism. The potential of IFN-γ to enhance inflammation required the adhesion molecule CD11b because CD11b-deficient mice failed to show the synergistic effects of IFN-γ and MDP cotreatment on adhering and infiltrating cells. IFN-γ was identified as a downstream mediator of NOD2-driven inflammation and the capacity of IFN-γ in vivo to enhance the inflammatory potential of NOD2 was demonstrated. Extrapolation of these findings in mice suggests that the dysregulation of IFN-γ may occur in patients with Blau syndrome, thereby contributing to the granulomatous nature of the disease.
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发表时间: 2002-01-08
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发表时间: 1985-01-01
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