通过细菌分泌的蛋白与宿主上皮的相互作用来诱导结核颗粒瘤
Hannah E Volkman1, Tamara C Pozos, John Zheng
1Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, WA 98155, USA.
概括
据认为限制细菌的结核颗粒瘤实际上促进了细菌的生长. 细菌蛋白ESAT-6触发MMP9,增强免疫细胞的招募和真菌细菌的增殖,这表明MMP9是一个治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 结核病的发病因子
背景情况:
- 颗粒瘤是结核病的特征,据信会限制Mycobacterium结核病菌的生长.
- 最近的研究表明,早期颗粒瘤可能通过招募和感染新的宿主细胞来促进菌根菌的扩张.
研究的目的:
- 阐明菌根细菌诱导颗粒瘤形成的分子机制.
- 研究分泌的蛋白质ESAT-6在这个过程中的作用.
- 探索向这种机制用于结核病治疗的潜力.
主要方法:
- 在斑马鱼中利用了Mycobacterium marinum感染模型.
- 研究ESAT-6在上皮细胞中诱导矩阵金属蛋白酶-9 (MMP9).
- 评估了MMP9对巨细胞招募,颗粒瘤成熟和细菌生长的影响.
- 破坏MMP9功能,以评估其在颗粒瘤形成和细菌增殖中的作用.
主要成果:
- 确定ESAT-6作为一种关键的细菌因子,在邻近的上皮细胞中诱导MMP9.
- 证明MMP9增强了未感染的巨细胞向颗粒瘤的招募.
- 表明MMP9有助于颗粒瘤的成熟,并促进菌根菌的生长.
- 发现破坏MMP9功能显著减弱了颗粒瘤的形成和细菌负载.
结论:
- 菌根菌利用分泌的蛋白质ESAT-6来诱导表皮MMP9,从而促进颗粒瘤形成和细菌生长.
- 这种机制涉及招募新的宿主细胞进行生产性感染.
- 向上皮层MMP9的生产代表了结核病潜在的宿主导治疗策略.
更多相关视频
07:42Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF1
Published on: February 28, 2025
07:42A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
Published on: June 5, 2014
相关概念视频
Pulmonary Tuberculosis II
Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Tuberculosis
Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...
Pulmonary Tuberculosis IV
Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
Pulmonary Tuberculosis III
Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
The first classification is based on the development of the disease, and it includes the following categories:
Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Pulmonary Tuberculosis I
Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
