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牢狱或顶层公寓:从微生物的角度看结核性肉芽肿。

Penitentiary or penthouse condo: the tuberculous granuloma from the microbe's point of view.

机构信息

Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

出版信息

Cell Microbiol. 2010 Mar;12(3):301-9. doi: 10.1111/j.1462-5822.2009.01424.x. Epub 2009 Dec 21.

Abstract

Granuloma formation represents a pivotal point during human infection with Mycobacterium tuberculosis, for this structure may limit mycobacterial spread and prevent active disease, while at the same time allow for the survival and persistence of viable mycobacteria within the host. The current therapeutic regimens for treating tuberculosis disease have proven effective in developing countries. However, in countries with large populations, limited access to health care, and high incidence of HIV co-infection, tuberculosis disease continues to represent a major global health emergency. Particularly, the emergence of extensively and multi-drug-resistant forms of tuberculosis underscores the need develop new treatment strategies. Recent mechanistic studies have identified bacterial virulence mechanisms that subvert host responses and lead to an inappropriate upregulation of host factors such as tumour necrosis factor-alpha (TNF-alpha) and matrix metalloproteinases (MMPs). Paradoxically, then, part of the mycobacterial virulence programme may be to promote granuloma development and maturation. These observations suggest that together with appropriate anti-microbials host-based therapeutics directed at TNF-alpha and MMP inhibition may counteract the microbial subterfuge, reduce the pro-granulomatous response, and offer an enhanced therapeutic effect. Host-directed therapy that alters the immune response may offer an alternative approach towards reducing treatment duration, the risk of anti-microbial resistance and improving patient outcome.

摘要

肉芽肿的形成代表了人类感染结核分枝杆菌的一个关键点,因为这种结构可以限制分枝杆菌的传播,防止活动性疾病的发生,同时允许宿主内存活和持续存在有活力的分枝杆菌。目前治疗结核病的方案在发展中国家已被证明是有效的。然而,在人口众多、医疗保健有限和艾滋病毒合并感染发生率高的国家,结核病仍然是一个主要的全球卫生紧急情况。特别是,广泛和多药耐药形式的结核病的出现凸显了开发新的治疗策略的必要性。最近的机制研究已经确定了细菌的毒力机制,这些机制颠覆了宿主的反应,并导致宿主因子如肿瘤坏死因子-α(TNF-α)和基质金属蛋白酶(MMPs)的不适当上调。矛盾的是,然后,部分分枝杆菌的毒力计划可能是促进肉芽肿的发展和成熟。这些观察结果表明,与适当的抗微生物药物一起,针对 TNF-α和 MMP 抑制的基于宿主的治疗方法可能会对抗微生物的诡计,减少促肉芽肿反应,并提供增强的治疗效果。改变免疫反应的宿主定向治疗可能是一种替代方法,可以减少治疗时间、抗微生物耐药性的风险,并改善患者的预后。

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