The stringent response is required for full virulence of Mycobacterium tuberculosis in guinea pigs.

The stringent response is required for full virulence of Mycobacterium tuberculosis in guinea pigs.
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DOI:
10.1086/656524
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发表时间:
2010-11-01
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Karakousis PC
Karakousis PC
中科院分区:
其他
文献类型:
--
作者:
Klinkenberg LG;Lee JH;Bishai WR;Karakousis PC

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在人类潜伏性结核病(TB)感染期间,结核分枝杆菌可能存在于干酪样肺肉芽肿的营养匮乏环境中。严格响应警报(p)ppGpp是由Rel合成的,以应对营养饥饿,从而使结核杆菌以协调的方式限制生长和关闭代谢。在这项研究中,我们在豚鼠模型中研究了一种缺乏rel的结核分枝杆菌突变体的毒力。采用定量RT-PCR方法研究(p)ppGpp缺乏对豚鼠肺组织关键细胞因子和趋化因子基因表达的影响。与野生型菌株相比,rell缺陷突变体的初始生长和存活受到损害。Rel的缺失与肉眼结节性病变和组织学上干酪样肉芽肿的明显缺失有关。感染后28天,rel缺陷突变体的表型减弱与肺中编码促炎细胞因子IFN-γ和TNF-α的基因表达增加无关。
During human latent tuberculosis (TB) infection, Mycobacterium tuberculosis likely resides within the nutrient-starved environment of caseous lung granulomas. The stringent response alarmone (p)ppGpp is synthesized by Rel in response to nutrient starvation, thus enabling tubercle bacilli to restrict growth and shut down metabolism in a coordinated fashion. In this study, we investigated the virulence of a rel-deficient M. tuberculosis mutant in the guinea pig model. Quantitative RT-PCR was used to study the effect of (p)ppGpp deficiency on expression of key cytokine and chemokine genes in guinea pig lungs. The rel-deficient mutant showed impaired initial growth and survival relative to the wild-type strain. Loss of Rel was associated with the striking absence of tubercle lesions grossly and of caseous granulomas histologically. The attenuated phenotype of the rel-deficient mutant was not associated with increased expression of genes encoding the proinflammatory cytokines IFN-γ and TNF-α in the lungs 28 days after infection.
DOI: 10.1111/j.1365-3083.1988.tb02338.x
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