Thioredoxins and Methionine Sulfoxide Reductases in the Pathophysiology of Pneumococcal Meningitis.

Thioredoxins and Methionine Sulfoxide Reductases in the Pathophysiology of Pneumococcal Meningitis.
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硫氧还蛋白和甲硫氨酸亚硫酸还原酶在肺炎球菌脑膜炎病理生理学中的作用

DOI:
10.1093/infdis/jiw268
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发表时间:
2016
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Hammerschmidt S
Hammerschmidt S
中科院分区:
--
文献类型:
--
作者:
Ribes S;Abdullah MR;Saleh M;Hanisch UK;Hammerschmidt S

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背景:肺炎球菌蛋白参与了对氧化应激的抵抗,在所有菌株中都存在,因此是可能适合新疗法和/或疫苗的潜在抗原。方法:通过Kaplan-Meier生存曲线、细菌学和组织学研究以及致炎介质的测定,我们研究了细胞外硫氧还蛋白脂蛋白(Etrx1和Etrx2)以及细胞内和细胞外蛋氨酸亚砜还原酶(分别为SpMsrAB1和SpMsrAB2)在肺炎球菌脑膜炎的进展和结局中的单独作用。结果:与野生型相比,Etrx1、Etrx2或SpMsrAB1的缺失适度减弱了毒力,但对脑内和血液中的细菌生长没有显著影响。SpMsrAB2单独、两种Etrx蛋白或两种SpMsrAB蛋白的功能丧失导致不那么严重的感染过程,死于感染的动物数量较少,相关脑膜炎症的风险较低,小脑、血液和脾中的细菌密度减少。结论:我们的数据支持细胞外氧化还原修复系统在毒力中的重要性及其作为设计新的抗菌药物和肺炎链球菌疫苗配方的潜在目标。
Background.Pneumococcal proteins involved in the resistance against oxidative stress are present in all strains and therefore are potential antigens that could be suitable for new therapies and/or vaccines. Their role in the pathogenesis of pneumococcal meningitis has not been addressed.Methods.We investigated the individual contributions of extracellular thioredoxin lipoproteins (Etrx1 and Etrx2) and the intracellular and extracellular methionine sulfoxide reductases (SpMsrAB1 and SpMsrAB2, respectively) in the progression and outcome of pneumococcal meningitis, using Kaplan–Meier survival curves, bacteriological and histological studies, and measurements of proinflammatory mediators.Results.The absence of Etrx1, Etrx2, or SpMsrAB1 moderately attenuated virulence as compared to the wild-type strain but did not significantly affect bacterial growth in the brain and bloodstream. Loss of function of SpMsrAB2 alone, both Etrx proteins, or both SpMsrAB proteins resulted in a less severe course of infection, with low numbers of animals dying of infection, a lower risk of associated meningeal inflammation, and reduced bacterial densities in the cerebellum, blood, and spleen.Conclusions.Our data support the importance of the extracellular redox repair system in virulence and its potential as a target for the design of new antimicrobials and vaccine formulations againstStreptococcus pneumoniae.
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