Tumor necrosis factor signaling mediates resistance to mycobacteria by inhibiting bacterial growth and macrophage death.

Tumor necrosis factor signaling mediates resistance to mycobacteria by inhibiting bacterial growth and macrophage death.
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肿瘤坏死因子信号传导通过抑制细菌生长和巨噬细胞死亡来介导对分枝杆菌的抗性。

DOI:
10.1016/j.immuni.2008.06.011
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发表时间:
2008-08-15
期刊:
影响因子:
32.4
通讯作者:
Ramakrishnan, Lalita
Ramakrishnan, Lalita
中科院分区:
医学1区
文献类型:
--
作者:
Clay, Hilary;Volkman, Hannah E.;Ramakrishnan, Lalita

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肿瘤坏死因子(TNF)是控制结核病的关键效应因子,被认为通过指导肉芽肿、巨噬细胞和其他免疫细胞的有组织聚集体的形成来发挥保护作用。TNF信号传导的缺失导致人类结核病的进展,结核分枝杆菌感染小鼠死亡率的增加与组织紊乱和坏死性肉芽肿有关,尽管TNF信号传导在该终点之前的发病机制阶段中的确切作用尚未确定。我们监测透明的海洋分枝杆菌感染的斑马鱼活进行逐步解剖的影响,肿瘤坏死因子信号在分枝杆菌的发病机制。我们发现,TNF信号的丢失导致死亡率增加,即使只有先天免疫是操作性的。在没有TNF的情况下,细胞内细菌生长和肉芽肿形成加速,随后是过度负载的巨噬细胞的坏死死亡和肉芽肿破裂。因此,TNF不是结核性肉芽肿形成所必需的,而是通过限制巨噬细胞内分枝杆菌的生长并防止其坏死来间接维持肉芽肿的完整性。
Tumor necrosis factor (TNF), a key effector in controlling tuberculosis, is thought to exert protection by directing formation of granulomas, organized aggregates of macrophages and other immune cells. Loss of TNF signaling causes progression of tuberculosis in humans and the increased mortality of Mycobacterium tuberculosis-infected mice is associated with disorganized and necrotic granulomas, though the precise roles of TNF signaling in the stages of pathogenesis preceding this endpoint remain undefined. We monitor transparent Mycobacterium marinum-infected zebrafish live to conduct a stepwise dissection of the effects of TNF signaling in mycobacterial pathogenesis. We find that loss of TNF signaling causes increased mortality even when only innate immunity is operant. In the absence of TNF intracellular bacterial growth and granuloma formation are accelerated followed by necrotic death of overladen macrophages and granuloma breakdown. Thus TNF is not required for tuberculous granuloma formation, but maintains granuloma integrity indirectly by restricting mycobacterial growth within macrophages and preventing their necrosis.
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