Origins of zinc starvation in Mycobacterium tuberculosis during chronic infection

结核分枝杆菌慢性感染期间锌饥饿的起源

• 批准号: 10425433
• 负责人: Anil Kumar Ojha
• 金额: $ 20.11万
• 依托单位: WADSWORTH CENTER
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-08 至 2025-05-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10425433
• 关键词: Aminoglycoside resistance; Aminoglycosides; Antibiotic Therapy; Antibiotics; Bacterial Infections; Binding; Biological Availability; Calcium Binding; Cells; Chronic; Disease; Dose; Drug resistance; Drug resistant Mycobacteria Tuberculosis; Environment; Frequencies; Growth; Hibernation; Host Defense; Hypoxia; Immune system; Immunologist; Infection; Ions; Knowledge; Lesion; Leukocyte L1 Antigen Complex; Lung; Mediating; Metals; Multidrug-Resistant Tuberculosis; Mus; Mycobacterium smegmatis; Mycobacterium tuberculosis; Neutrophil Infiltration; Neutrophilic Infiltrate; Nutrient; Nutrient Depletion; Nutritional Immunity; Oral; Oral Administration; Pathogenesis; Persons; Phagosomes; Pharmaceutical Preparations; Phenotype; Population; Proteins; Public Health; Recombinants; Regimen; Reporter; Resistance; Ribosomal Interaction; Ribosomal RNA; Ribosomes; Role; S100 Proteins; S100A8 gene; S100A9 gene; Site; Starvation; Streptomycin; Testing; Therapeutic; Transition Elements; Treatment Efficacy; Treatment Protocols; Treatment outcome; Tuberculosis; Y protein; Zinc; Zinc Oxide; Zinc supplementation; aerosolized; base; chronic infection; direct application; extracellular; improved; insight; mycobacterial; nanoparticle; neutrophil; novel strategies; pathogen; response; tuberculosis chemotherapy; tuberculosis treatment; Aminoglycoside resistance; Aminoglycosides; Antibiotic Therapy; Antibiotics; Bacterial Infections; Binding; Biological Availability; Calcium Binding; Cells; Chronic; Disease; Dose; Drug resistance; Drug resistant Mycobacteria Tuberculosis; Environment; Frequencies; Growth; Hibernation; Host Defense; Hypoxia; Immune system; Immunologist; Infection; Ions; Knowledge; Lesion; Leukocyte L1 Antigen Complex; Lung; Mediating; Metals; Multidrug-Resistant Tuberculosis; Mus; Mycobacterium smegmatis; Mycobacterium tuberculosis; Neutrophil Infiltration; Neutrophilic Infiltrate; Nutrient; Nutrient Depletion; Nutritional Immunity; Oral; Oral Administration; Pathogenesis; Persons; Phagosomes; Pharmaceutical Preparations; Phenotype; Population; Proteins; Public Health; Recombinants; Regimen; Reporter; Resistance; Ribosomal Interaction; Ribosomal RNA; Ribosomes; Role; S100 Proteins; S100A8 gene; S100A9 gene; Site; Starvation; Streptomycin; Testing; Therapeutic; Transition Elements; Treatment Efficacy; Treatment Protocols; Treatment outcome; Tuberculosis; Y protein; Zinc; Zinc Oxide; Zinc supplementation; aerosolized; base; chronic infection; direct application; extracellular; improved; insight; mycobacterial; nanoparticle; neutrophil; novel strategies; pathogen; response; tuberculosis chemotherapy; tuberculosis treatment

Summary Tuberculosis (TB) is a major public health burden in the world: over a million people die of the disease every year and an estimated one third of the world’s population harbor the pathogen Mycobacterium tuberculosis (Mtb). Treatment of TB requires 6 to 9 months of an antibiotic regimen comprising of multiple antibiotics. Difficulties in treatment of TB are largely attributed to non-inheritable drug resistance in the pathogen that are considered to be developed due to unique microenvironments in the host (e.g. nutrient depletion, hypoxia and antibiotic exposure). Recently, we uncovered one such condition: zinc starvation. In response to zinc starvation both Mycobacterium smegmatis and Mycobacterium tuberculosis induce ribosome remodeling and ribosome hibernation. Ribosome remodeling involves replacement of multiple ribosomal (r-) proteins containing the zinc-binding CXXC motif (therefore called C+ r-proteins) by their motif- free C- paralogues. Ribosome hibernation involves binding of mycobacterial protein Y (Mpy) to the decoding center of the C- ribosome. Ribosome remodeling occurs at a zinc concentration that permits growth, whereas ribosome hibernation occurs at a growth-restrictive concentration of zinc. Moreover, mycobacterial cells harboring remodeled and hibernating ribosomes are resistant to aminoglycosides and spectinamides. Furthermore, we demonstrated that zinc in the host lung environment during chronic Mtb infection is low enough to induce ribosome remodeling and Mpy- dependent resistance to streptomycin, an aminoglycoside used in the treatment of multi-drug resistant TB. However, the underlying cause for zinc starvation in Mtb during chronic infection is not known. Based on the idea that metal ion starvation during bacterial infections is an innate host defense strategy, called nutritional immunity, we propose to identify the components of host immune system responsible for zinc starvation in Mtb (Aim 1), and determine the potential of zinc oxide nanoparticles as an adjunct therapeutic (Aim 2). Upon completion of the project we will gain further insight into the cause of zinc starvation and related ribosome remodeling/hibernation in Mtb during chronic infection, and develop a therapeutic strategy to minimize the drug resistance caused by these changes to the ribosome in Mtb.

概括 结核病（TB）是世界上主要的公共卫生伯恩顿：超过一百万的人死亡 每年疾病，估计世界人口的三分之一藏有病原体 结核分枝杆菌（MTB）。结核病的治疗需要6至9个月的抗生素 疗法完成多种抗生素。结核病治疗困难主要归因于 由于独特 宿主中的微环境（例如，营养耗尽，缺氧和抗生素暴露）。最近， 我们发现了一种这样的条件：锌饥饿。响应锌饥饿 分枝杆菌和结核分枝杆菌诱导核糖体重塑和 核糖体冬眠。核糖体重塑涉及替换多个核糖体（R-） 包含锌结合CXXC基序的蛋白质（三个称为C+ R蛋白）的蛋白质。 免费的c-副群体。核糖体冬眠涉及分枝杆菌蛋白Y（MPY）与 C-核糖体的解码中心。核糖体重塑发生在锌浓度下 允许生长，而核糖体休眠发生在生长限制的锌浓度下。 此外，具有重塑和冬眠核糖体的分枝杆菌细胞具有抗性 氨基糖苷和舒张酰胺。此外，我们证明了宿主肺中的锌 慢性MTB感染期间的环境足够低，可以诱导核糖体重塑和MPY- 对链霉素的依赖性抗性，这是一种用于治疗多药的氨基糖苷 抗性结核但是，慢性感染期间MTB中锌饥饿的根本原因是 不知道。基于细菌感染期间金属离子饥饿的想法是先天宿主 国防策略，称为营养免疫，我们建议确定宿主的组成部分 免疫系统负责MTB中的锌饥饿（AIM 1），并确定锌的潜力 氧化纳米颗粒作为辅助疗法（AIM 2）。项目完成后，我们将获得 进一步了解锌饥饿和相关核糖体重塑/冬眠的原因 慢性感染期间的MTB，并制定一种治疗策略以最大程度地减少耐药性 由MTB中核糖体的这些变化引起的。