Human and Mouse Hematopoietic Stem Cells Are a Depot for Dormant Mycobacterium tuberculosis.

Human and Mouse Hematopoietic Stem Cells Are a Depot for Dormant Mycobacterium tuberculosis.
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DOI:
10.1371/journal.pone.0169119
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Melchers F
Melchers F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Tornack J;Reece ST;Bauer WM;Vogelzang A;Bandermann S;Zedler U;Stingl G;Kaufmann SH;Melchers F

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据估计,世界上有三分之一的人口潜伏感染结核分枝杆菌(Mtb),没有结核病(TB)的临床症状,但终身有重新激活为活动性疾病的风险。潜伏性结核感染期间持续存在的细菌的小生境仍不清楚。我们检测结核分枝杆菌DNA在外周血中选择性地在长期再生多能造血干细胞(LT-pHSC),以及在间充质干细胞从潜伏感染的人供体。在感染少量Mtb的小鼠中,其不发展活动性疾病,我们再次发现选择性感染Mtb的LT-pHSC。在人和小鼠LT-pHSC中,Mtb是应激或休眠的非复制细菌。将感染Mtb的人和小鼠LT-pHSC气管内注射到免疫缺陷小鼠中,可使Mtb复苏为肺内复制的细菌,并伴有活动性感染的迹象。我们的结论是,LT-pHSC,与骨髓间充质干细胞的结核分枝杆菌感染的人类和小鼠作为一个迄今为止不受重视的静止细胞库结核分枝杆菌在潜伏性结核感染。
An estimated third of the world’s population is latently infected with Mycobacterium tuberculosis (Mtb), with no clinical signs of tuberculosis (TB), but lifelong risk of reactivation to active disease. The niches of persisting bacteria during latent TB infection remain unclear. We detect Mtb DNA in peripheral blood selectively in long-term repopulating pluripotent hematopoietic stem cells (LT-pHSCs) as well as in mesenchymal stem cells from latently infected human donors. In mice infected with low numbers of Mtb, that do not develop active disease we, again, find LT-pHSCs selectively infected with Mtb. In human and mouse LT-pHSCs Mtb are stressed or dormant, non-replicating bacteria. Intratracheal injection of Mtb-infected human and mouse LT-pHSCs into immune-deficient mice resuscitates Mtb to replicating bacteria within the lung, accompanied by signs of active infection. We conclude that LT-pHSCs, together with MSCs of Mtb-infected humans and mice serve as a hitherto unappreciated quiescent cellular depot for Mtb during latent TB infection.
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