High-density lipoprotein suppresses tumor necrosis factor alpha production by mycobacteria-infected human macrophages.

High-density lipoprotein suppresses tumor necrosis factor alpha production by mycobacteria-infected human macrophages.
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DOI:
10.1038/s41598-018-24233-1
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发表时间:
2018-04-30
期刊:
影响因子:
4.6
通讯作者:
Matsumoto S
Matsumoto S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Inoue M;Niki M;Ozeki Y;Nagi S;Chadeka EA;Yamaguchi T;Osada-Oka M;Ono K;Oda T;Mwende F;Kaneko Y;Matsumoto M;Kaneko S;Ichinose Y;Njenga SM;Hamano S;Matsumoto S

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对寄生病原体的免疫反应受到宿主生理条件的影响。高密度脂蛋白(HDL)和低密度脂蛋白(LDL)是肝脏和外周组织之间的脂质转运蛋白,并调节促炎免疫反应。致病性分枝杆菌是寄生在细胞内的细菌,可以在巨噬细胞内存活很长一段时间。因此,巨噬细胞功能是宿主防御分枝杆菌的关键。这些基本事实表明HDL和LDL对分枝杆菌疾病的可能影响,迄今尚未阐明。在这项研究中,我们发现HDL而不是LDL增强了人类巨噬细胞中的分枝杆菌感染。然而,我们观察到HDL显著抑制分枝杆菌感染后肿瘤坏死因子α(TNF-α)的产生。TNF-α是一种重要的宿主保护性细胞因子,可对抗分枝杆菌疾病。我们证明了toll样受体(TLR)-2与分枝杆菌感染的人巨噬细胞产生TNF-α有关。随后的分析表明,HDL下调TLR 2的表达,并抑制其细胞内信号通路。本报告首次证明了高密度脂蛋白在分枝杆菌感染人类巨噬细胞中的实质性作用。
Immune responses to parasitic pathogens are affected by the host physiological condition. High-density lipoprotein (HDL) and low-density lipoprotein (LDL) are transporters of lipids between the liver and peripheral tissues, and modulate pro-inflammatory immune responses. Pathogenic mycobacteria are parasitic intracellular bacteria that can survive within macrophages for a long period. Macrophage function is thus key for host defense against mycobacteria. These basic facts suggest possible effects of HDL and LDL on mycobacterial diseases, which have not been elucidated so far. In this study, we found that HDL and not LDL enhanced mycobacterial infections in human macrophages. Nevertheless, we observed that HDL remarkably suppressed production of tumor necrosis factor alpha (TNF-α) upon mycobacterial infections. TNF-α is a critical host-protective cytokine against mycobacterial diseases. We proved that toll-like receptor (TLR)-2 is responsible for TNF-α production by human macrophages infected with mycobacteria. Subsequent analysis showed that HDL downregulates TLR2 expression and suppresses its intracellular signaling pathways. This report demonstrates for the first time the substantial action of HDL in mycobacterial infections to human macrophages.
结核分枝杆菌对抗原呈递的调节:Toll 样受体的作用。
DOI: 10.1038/nrmicro2321
发表时间: 2010-04
期刊: Nature reviews. Microbiology
影响因子: --
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期刊: ATHEROSCLEROSIS
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