Intracellular Mycobacterium avium intersect transferrin in the Rab11(+) recycling endocytic pathway and avoid lipocalin 2 trafficking to the lysosomal pathway.

Intracellular Mycobacterium avium intersect transferrin in the Rab11(+) recycling endocytic pathway and avoid lipocalin 2 trafficking to the lysosomal pathway.
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DOI:
10.1086/650493
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发表时间:
2010-03
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Flo TH
Flo TH
中科院分区:
其他
文献类型:
--
作者:
Halaas O;Steigedal M;Haug M;Awuh JA;Ryan L;Brech A;Sato S;Husebye H;Cangelosi GA;Akira S;Strong RK;Espevik T;Flo TH

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铁是微生物必需的营养物质,许多病原菌依靠铁载体来获取铁。哺乳动物先天免疫蛋白脂质运载蛋白 2(Lcn2、NGAL、24p3、铁运载蛋白)与铁载体羧基分枝杆菌素结合,后者是分枝杆菌铁获取装置的重要组成部分。在这里,我们发现 Lcn2 抑制培养物中鸟分枝杆菌的生长,并且鸟分枝杆菌诱导小鼠巨噬细胞产生 Lcn2。 Lcn2 也升高,最初限制了受感染小鼠血液中鸟分枝杆菌的生长,但并不阻碍组织中和长期感染期间的生长。鸟分枝杆菌是一种细胞内病原体。受感染巨噬细胞的亚细胞成像显示,Lcn2 转运至与鸟分枝杆菌分离的溶酶体,而转铁蛋白则有效转运至分枝杆菌。因此,分枝杆菌似乎存在于 Rab11+ 内吞再循环途径中,从而保留了营养获取并避免了 Lcn2 等内吞免疫蛋白。
Iron is an essential nutrient for microbes and many pathogenic bacteria depend on siderophores to obtain iron. The mammalian innate immunity protein lipocalin 2 (Lcn2, NGAL, 24p3, Siderocalin) binds the siderophore carboxymycobactin, an essential component of the iron acquisition apparatus of mycobacteria. Here we show that Lcn2 suppressed growth of Mycobacterium avium in culture, and M. avium induced Lcn2 production from mouse macrophages. Lcn2 was also elevated and initially limited the growth of M. avium in the blood of infected mice, but did not impede growth in tissues and during long-term infections. M. avium is an intracellular pathogen. Subcellular imaging of infected macrophages revealed that Lcn2 trafficked to lysosomes separate from M. avium, whereas transferrin was efficiently transported to the mycobacteria. Thus mycobacteria seem to reside in the Rab11+ endocytic recycling pathway, thereby retaining access to nutrition and avoiding endocytosed immunoproteins like Lcn2.
结核分枝杆菌的外塞蛋白从人体结合蛋白中去除铁,并将铁捐赠给结核分枝杆菌细胞壁中的霉菌素。
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