结核菌 Mycobacterium 菌诱导人体肺纤维细胞中的热致死
Takemasa Takii1,2,3, Hiroyuki Yamada1, Chihiro Motozono4,5
1Department of Mycobacterium Reference and Research, the Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, Kiyose, Tokyo, Japan.
mSphere
|May 19, 2025
概括
活生生的 Mycobacterium 结核病 (Mtb) 感染会在肺纤维细胞中诱导细胞死亡的一种形式 pyroptosis. 这种宿主细胞反应,涉及炎症性细胞因子,激活免疫系统对抗Mtb感染.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 微生物学 微生物学
背景情况:
- 纤维细胞被认为是非经典的免疫细胞,在Mycobacterium结核病 (Mtb) 感染中扮演着被低估的角色.
- 以前的研究表明,活体mtb诱导肺纤维细胞的细胞死亡,与巨细胞或单细胞不同.
研究的目的:
- 研究肺纤维细胞中Mtb诱导的细胞死亡的机制和相关性.
- 为了确定感染Mtb的纤维细胞是否会触发免疫反应.
主要方法:
- 人类肺纤维细胞系 (MRC-5,MRC-9,TIG-1) 感染了两个不同的Mtb菌株 (HN878和H37Rv).
- 实时细胞生长/细胞毒性测量 (Maestro-Z).
- 传输电子显微镜用于Mtb吸收确认.
- 细胞因子表达分析 (IL-1β,IL-6,IL-8).
- 使用卡斯巴酶和炎症酶抑制剂的抑制研究.
- 对mtb和宿主细胞基因表达的双RNA-Seq分析.
主要成果:
- 活着的Mtb,但没有死亡,诱导纤维细胞细胞死亡和炎症性细胞因子生产.
- 纤维细胞的Mtb吸收得到证实.
- 纤维细胞死亡被确定为热亡,依赖于卡斯帕-1/4和NLRP3炎症体,但不是卡斯帕-3/9.
- 双RNA-Seq揭示了与生存和宿主基因上调相关的Mtb基因上调,包括IL-1β,IL-6,IL-8,caspase-4和NLRP3.
结论:
- Mtb细菌试图在肺纤维细胞中生存.
- Mtb感染会在宿主纤维细胞中触发热,从而激活免疫系统.
- 纤维细胞在宿主对Mtb感染的免疫反应中发挥着重要作用.
相关概念视频
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...
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...
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:
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...
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...


