Mycobacterium tuberculosis evades macrophage defenses by inhibiting plasma membrane repair.

Mycobacterium tuberculosis evades macrophage defenses by inhibiting plasma membrane repair.
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DOI:
10.1038/ni.1758
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发表时间:
2009-08
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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诱导巨噬细胞坏死是剧毒结核分枝杆菌 (Mtb) 用来避免宿主先天防御的重要策略。相反,减毒 Mtb 会导致细胞凋亡,从而限制细菌复制并促进抗原呈递细胞交叉启动 T 细胞。在这里,我们证明了 Mtb 感染会导致质膜微破坏。这些病变的重新封闭(对于防止坏死和促进细胞凋亡至关重要的过程)需要溶酶体和高尔基体衍生的囊泡易位到质膜。质膜修复依赖于前列腺素 E2 (PGE2),它调节突触结合蛋白 7,这是参与溶酶体介导的修复机制的 Ca++ 传感器。通过诱导脂氧素 A4 (LXA4) 的产生,阻止 PGE2 生物合成,剧毒 Mtb 阻止膜修复并诱导坏死。因此,剧毒的结核分枝杆菌会损害巨噬细胞质膜修复以逃避宿主的防御。
Induction of macrophage necrosis is an important strategy used by virulent Mycobacterium tuberculosis (Mtb) to avoid innate host defense. In contrast, attenuated Mtb causes apoptosis, which limits bacterial replication and promotes T cell cross priming by antigen presenting cells. Here we demonstrated that Mtb infection causes plasma membrane microdisruptions. Resealing of these lesions—a process crucial for preventing necrosis and promoting apoptosis—required the translocation of lysosome and Golgi apparatus-derived vesicles to the plasma membrane. Plasma membrane repair depended on prostaglandin E2 (PGE2), which regulates synaptotagmin 7, the Ca++ sensor involved in the lysosome-mediated repair mechanism. By inducing production of lipoxin A4 (LXA4), which blocks PGE2 biosynthesis, virulent Mtb prevented membrane repair and induced necrosis. Thus, virulent Mtb impairs macrophage plasma membrane repair to evade host defenses.
DOI: 10.1084/jem.20080767
发表时间: 2008-11-24
期刊: The Journal of experimental medicine
影响因子: --
作者:
Chen M;Divangahi M;Gan H;Shin DS;Hong S;Lee DM;Serhan CN;Behar SM;Remold HG
通讯作者: Remold HG
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影响因子: 3.5
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