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人肺上皮细胞在晚期内体空泡中含有结核分枝杆菌,并能被CD8⁺T细胞有效识别。

Human lung epithelial cells contain Mycobacterium tuberculosis in a late endosomal vacuole and are efficiently recognized by CD8⁺ T cells.

作者信息

Harriff Melanie J, Cansler Meghan E, Toren Katelynne Gardner, Canfield Elizabeth T, Kwak Stephen, Gold Marielle C, Lewinsohn David M

机构信息

Portland Veterans Administration Medical Center, Portland, Oregon, United States of America; Department of Pulmonary and Critical Care Medicine, Oregon Health & Sciences University, Portland, Oregon, United States of America.

Department of Pediatrics, Oregon Health & Sciences University, Portland, Oregon, United States of America.

出版信息

PLoS One. 2014 May 14;9(5):e97515. doi: 10.1371/journal.pone.0097515. eCollection 2014.

Abstract

Mycobacterium tuberculosis (Mtb) is transmitted via inhalation of aerosolized particles. While alveolar macrophages are thought to play a central role in the acquisition and control of this infection, Mtb also has ample opportunity to interact with the airway epithelium. In this regard, we have recently shown that the upper airways are enriched with a population of non-classical, MR1-restricted, Mtb-reactive CD8⁺ T cells (MAIT cells). Additionally, we have demonstrated that Mtb-infected epithelial cells lining the upper airways are capable of stimulating IFNγ production by MAIT cells. In this study, we demonstrate that airway epithelial cells efficiently stimulate IFNγ release by MAIT cells as well as HLA-B45 and HLA-E restricted T cell clones. Characterization of the intracellular localization of Mtb in epithelial cells indicates that the vacuole occupied by Mtb in epithelial cells is distinct from DC in that it acquires Rab7 molecules and does not retain markers of early endosomes such as Rab5. The Mtb vacuole is also heterogeneous as there is a varying degree of association with Lamp1 and HLA-I. Although the Mtb vacuole shares markers associated with the late endosome, it does not acidify, and the bacteria are able to replicate within the cell. This work demonstrates that Mtb infected lung epithelial cells are surprisingly efficient at stimulating IFNγ release by CD8⁺ T cells.

摘要

结核分枝杆菌(Mtb)通过吸入雾化颗粒进行传播。虽然肺泡巨噬细胞被认为在这种感染的获得和控制中起核心作用,但Mtb也有充足的机会与气道上皮细胞相互作用。在这方面,我们最近发现上呼吸道富含一群非经典的、受MR1限制的、对Mtb有反应的CD8⁺ T细胞(黏膜相关恒定T细胞,MAIT细胞)。此外,我们已经证明,上呼吸道内衬的Mtb感染上皮细胞能够刺激MAIT细胞产生γ干扰素(IFNγ)。在本研究中,我们证明气道上皮细胞能有效刺激MAIT细胞以及HLA - B45和HLA - E限制的T细胞克隆释放IFNγ。对上皮细胞中Mtb细胞内定位的表征表明,上皮细胞中被Mtb占据的液泡与树突状细胞(DC)中的不同,因为它获得了Rab7分子,并且不保留早期内体的标记物如Rab5。Mtb液泡也是异质性的,因为它与溶酶体相关膜蛋白1(Lamp1)和HLA - I有不同程度的关联。尽管Mtb液泡共享与晚期内体相关的标记物,但它不会酸化,并且细菌能够在细胞内复制。这项工作表明,Mtb感染的肺上皮细胞在刺激CD8⁺ T细胞释放IFNγ方面出奇地有效。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96eb/4020835/c797c0ec78bc/pone.0097515.g001.jpg

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