ROS responses during Vibrio cholerae infection

霍乱弧菌感染期间的ROS反应

基本信息

批准号：
9890925
负责人：
Jun Zhu
金额：
$ 45.69万
依托单位：
UNIVERSITY OF PENNSYLVANIA
依托单位国家：
美国
项目类别：
财政年份：
2016
资助国家：
美国
起止时间：
2016-04-01 至 2023-03-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/9890925
关键词：
Adult Animal Model Animals Cell physiology Cells Cholera Country Cysteine Disease Enzymes Escherichia coli Experimental Animal Model Feces Fimbriae Proteins Gene Expression Genes Genetic Transcription Goals Growth Haiti Human Immune response Infection Inflammation Inflammatory Intestines Lead Light Minor Modeling Modification Mus NADPH Oxidase Pathogenesis Pathogenicity Pathology Patients Phase Play Post-Translational Protein Processing Post-Translational Regulation Poverty Production Property Proteins Proteomics Reactive Oxygen Species Regulation Regulatory Pathway Research Resistance Resolution Resources Role Salmonella Sampling Series Signal Pathway Signal Transduction Small Intestines Sulfhydryl Compounds Tissues Transcriptional Regulation Vibrio cholerae Vibrio cholerae infection Virulence Virulence Factors base diarrheal disease experimental study gut microbiome gut microbiota host colonization human pathogen in vivo microbiome mouse model novel novel strategies public health relevance resistance mechanism response stool sample tissue culture transcriptome sequencing transposon sequencing

项目摘要

DESCRIPTION (provided by applicant): Vibrio cholerae is a human pathogen which colonizes small intestines of host, resulting in the onset of a severe diarrheal disease known as cholera. In order for V. cholerae to successfully colonize the host, it must express a series of virulence factors, which have been the main focus of the cholera research. However, bacterial pathogenicity is a multifactorial property in vivo that involves host response to infection, and gu microbiome interference of colonization. For example, although the pathology of cholera is not immune driven, it has been shown that minor, but significant inflammation responses in cholera patients and in experimental animal models are induced by V. cholerae infection and likely play a role in the resolution of disease. Little is known how inflammation is induced by V. cholerae and how V. cholerae copes with these signals and help its colonization. Here we performed an RNAseq analysis on mouse intestines free of V. cholerae and those that were infected to determine host responses to V. cholerae infection. One gene involved in reactive oxygen species (ROS) production, Duox2, encoding an NADPH oxidase and has been shown to be essential for controlling the growth of gut flora, was strongly upregulated. We show that both Duox2 expression and ROS production are induced by V. cholerae in a tissue culture model and in mice. Interestingly, this induction is dependent on V. cholerae virulence gene expression. Moreover, our preliminary studies indicate that V. cholerae cells in cholera patients' stool samples are highly resistant to ROS, suggesting that V. cholerae undergoes induction of ROS resistance during infection. To elucidate how V. cholerae overcome ROS produced by the host, we performed a Tn-seq experiment and found a set of V. cholerae genes that are required for ROS resistance in vivo. Together with a proteomics approach, we reveal novel transcriptional and posttranslational regulation mechanisms that are involved in regulating ROS resistance. Therefore we hypothesize that during infection, V. cholerae induces host Duox2 expression, thus ROS production, which facilitate V. cholerae colonization by modulating gut flora composition, whereas transcriptional and posttranslational regulatory pathways lead to V. cholerae inherently resistant to ROS in vivo. We will investigate the mechanism of V. cholerae-induced host ROS production and its effects on gut microbiota composition and V. cholerae colonization. We will investigate V. cholerae ROS resistance during infection of an adult mouse model. We will focus on transcriptional regulation and posttranslational modification of cellular functions of ROS resistance. Finally, we will investigate V. cholerae ROS resistance mechanisms in cholera patients by performing RNAseq and proteomic analysis of V. cholerae cells directly from cholera patient vomituses and stools.

描述（由适用提供）：Vibrio Cholerae是一种人类病原体，可在宿主的小肠道上定居，导致严重的腹泻病发作，称为霍乱。霍乱葡萄球菌（V. cholerae）的命令使宿主成功定居，它必须表达一系列病毒因素，这是霍乱研究的主要重点。然而，细菌的致病性是体内的多因素特性，涉及宿主对感染的反应和gu微生物组的定殖。例如，尽管霍乱的病理不是免疫驱动的，但已表明霍乱患者和实验动物模型的次要感染反应是由霍乱弧菌感染诱导的，并且可能在疾病解决中起作用。几乎鲜为人知的霍乱葡萄球菌如何诱发炎症，以及V.霍乱如何应对这些信号并有助于其定植。在这里，我们对没有霍乱弧菌的小鼠肠以及被感染的小鼠肠道进行了RNASEQ分析，以确定宿主对霍乱弧菌感染的反应。一个编码NADPH氧化物的Duox2中涉及活性氧（ROS）产生的基因（ROS），已被证明对控制肠道菌群的生长至关重要。我们表明，在组织培养模型和小鼠中，霍乱弧菌均诱导了DUOX2表达和ROS的产生。有趣的是，这种诱导取决于霍乱链球菌病毒基因表达。此外，我们的初步研究表明，霍乱患者粪便样品中的霍乱细胞对ROS具有高度耐药性，这表明霍乱谷（V. cholerae）在感染过程中受到ROS耐药性的诱导。为了阐明V.霍乱如何克服宿主产生的ROS，我们进行了TN-Seq实验，并找到了一组在体内抗ROS抗性所需的霍乱基因。与蛋白质组学方法一起，我们揭示了与控制ROS抗性有关的新型转录和翻译后调节机制。因此，我们假设在感染期间，霍乱葡萄球菌诱导宿主DUOX2表达，从而通过调节肠道菌群组成来促进霍尔拉氏菌定植。我们将研究霍乱谷链球菌诱导的宿主ROS的产生及其对肠道菌群组成和霍乱链球菌定殖的作用。我们将在成年小鼠模型感染期间研究霍乱五和霍乱的抗性。我们将重点介绍ROS耐药性细胞功能的转录调节和翻译后修饰。最后，我们将通过直接从霍乱患者呕吐物和粪便中对霍乱患者进行霍乱患者的霍乱五和霍乱抗性机制。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Hypermutation-induced in vivo oxidative stress resistance enhances Vibrio cholerae host adaptation.

DOI：
10.1371/journal.ppat.1007413
发表时间：
2018-10
期刊：
PLoS pathogens
影响因子：
6.7
作者：
Wang H;Xing X;Wang J;Pang B;Liu M;Larios-Valencia J;Liu T;Liu G;Xie S;Hao G;Liu Z;Kan B;Zhu J
通讯作者：
Zhu J

Proteolysis of ToxR is controlled by cysteine-thiol redox state and bile salts in Vibrio cholerae.