细胞间黏附分子 1(ICAM-1)在控制鸟分枝杆菌感染中的作用。

Contribution of intercellular adhesion molecule 1 (ICAM-1) to control Mycobacterium avium infection.

机构信息

Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; Instituto Nacional de Ciência e Tecnologia em Doenças Tropicais (INCT-DT), Conselho Nacional de Desenvolvimento Científico e Tecnológico, Ministério de Ciência Tecnologia e Inovação, Salvador, Bahia, Brazil.

出版信息

Microbes Infect. 2017 Nov;19(11):527-535. doi: 10.1016/j.micinf.2017.09.005. Epub 2017 Sep 22.

Abstract

Mycobacterium avium is a facultative intracellular opportunistic pathogen especially relevant in cases of people living with AIDS. The aim of this study was to evaluate the role of intercellular adhesion molecule 1 (ICAM-1) in the inflammatory response against M. avium infection. Mice deficient for ICAM-1 (ICAM KO) and infected with M. avium presented increased bacterial load in the spleen, liver and lungs compared to C57BL/6. Moreover, ICAM deficient mice presented reduced granuloma area in liver at 30 days post-infection with reduced numbers of lymphocytes and granulocytes. The assessment of in vitro cytokine production by ICAM KO spleen cells showed lower levels of IFN-γ compared to C57BL/6, whereas TNF-α remained unaltered. Additionally, the production of IFN-γ in liver and spleen tissues was also diminished in ICAM-1 KO mice. Interestingly, a persistent reduction in IFN-γ production was observed in CD3NK1.1 cells of ICAM-1 deficient mice compared to wild-type animals. Together, these results demonstrate the importance of ICAM-1 in the efficient control of M. avium infection and granuloma formation and highlights its role on CD3NK1.1 cell population as important for IFN-γ production during infection.

摘要

鸟分枝杆菌是一种兼性细胞内机会性病原体,特别是在艾滋病患者中。本研究旨在评估细胞间黏附分子 1(ICAM-1)在对抗鸟分枝杆菌感染的炎症反应中的作用。与 C57BL/6 相比,缺乏 ICAM-1(ICAM KO)的小鼠感染鸟分枝杆菌后,脾脏、肝脏和肺部的细菌载量增加。此外,ICAM 缺陷小鼠在感染后 30 天肝脏中的肉芽肿面积减小,淋巴细胞和粒细胞数量减少。评估 ICAM KO 脾细胞的体外细胞因子产生表明 IFN-γ 水平低于 C57BL/6,而 TNF-α 保持不变。此外,ICAM-1 KO 小鼠的肝脏和脾脏组织中 IFN-γ 的产生也减少。有趣的是,与野生型动物相比,ICAM-1 缺陷小鼠的 CD3NK1.1 细胞中 IFN-γ 的产生持续减少。综上所述,这些结果表明 ICAM-1 在有效控制鸟分枝杆菌感染和肉芽肿形成中的重要性,并强调其在 CD3NK1.1 细胞群中的作用对于感染期间 IFN-γ 的产生很重要。

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