Helicobacter pylori Outer Membrane Protein 18 (Hp1125) Is Involved in Persistent Colonization by Evading Interferon- γ Signaling.

Helicobacter pylori Outer Membrane Protein 18 (Hp1125) Is Involved in Persistent Colonization by Evading Interferon- γ Signaling.
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幽门螺杆菌外膜蛋白 18 (Hp1125) 通过逃避干扰素伽马信号传导参与持续定植

DOI:
10.1155/2015/571280
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发表时间:
2015
影响因子:
--
通讯作者:
Jia J
Jia J
中科院分区:
生物学3区
文献类型:
--
作者:
Shan Y;Lu X;Han Y;Li X;Wang X;Shao C;Wang L;Liu Z;Tang W;Sun Y;Jia J

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外膜蛋白(OMP)可以诱导免疫反应。幽门螺杆菌的 Omp18 (HP1125) 是一种强大的抗原,可以诱导显着的干扰素-γ (IFN-γ) 水平。先前的研究表明,IFN-γ 在幽门螺杆菌清除中发挥着重要作用。然而,幽门螺杆菌具有多种机制来避免宿主免疫监视以进行持续定植。我们生成了 omp18 突变体(幽门螺杆菌 26695 和幽门螺杆菌 SS1)菌株,以检查 Omp18 是否与 IFN-γ 相互作用并参与幽门螺杆菌定植。 qRT-PCR 显示 IFN-γ 诱导 Omp18 表达。 qRT-PCR 和蛋白质印迹分析显示,经 IFN-γ 处理后,幽门螺杆菌 26695 中毒力因子 CagA 和 NapA 的表达降低,但在 Δomp18 菌株中却被诱导表达。在感染幽门螺杆菌 SS1 和 Δomp18 菌株的 C57BL/6 小鼠中,Δomp18 菌株导致定植缺陷并激活更强的炎症反应。在 IFN-γ 处理的巨噬细胞中,信号转导器磷酸化和转录 1 (STAT1) 激活剂被野生型菌株下调,但 Δomp18 菌株则不然。此外,与野生型菌株相比,Δomp18菌株在巨噬细胞中的存活率较低。我们得出结论,幽门螺杆菌 Omp18 具有影响 IFN-γ 介导的免疫反应以参与持续定植的重要功能。
Outer membrane proteins (OMPs) can induce an immune response. Omp18 (HP1125) of H. pylori is a powerful antigen that can induce significant interferon-γ (IFN-γ) levels. Previous studies have suggested that IFN-γ plays an important role in H. pylori clearance. However, H. pylori has multiple mechanisms to avoid host immune surveillance for persistent colonization. We generated an omp18 mutant (H. pylori 26695 and H. pylori SS1) strain to examine whether Omp18 interacts with IFN-γ and is involved in H. pylori colonization. qRT-PCR revealed that IFN-γ induced Omp18 expression. qRT-PCR and western blot analysis revealed reduced expressions of virulence factors CagA and NapA in H. pylori 26695 with IFN-γ treatment, but they were induced in the Δomp18 strain. In C57BL/6 mice infected with H. pylori SS1 and the Δomp18 strain, the Δomp18 strain conferred defective colonization and activated a stronger inflammatory response. Signal transducer phosphorylation and transcription 1 (STAT1) activator was downregulated by the wild-type strain but not the Δomp18 strain in IFN-γ-treated macrophages. Furthermore, Δomp18 strain survival rates were poor in macrophages compared to the wild-type strain. We concluded that H. pylori Omp18 has an important function influencing IFN-γ-mediated immune response to participate in persistent colonization.
DOI: 10.1128/iai.72.1.537-545.2004
发表时间: 2004-01-01
影响因子: 3.1
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