Related Experiment Video
Updated: Jan 3, 2026

An Automated Culture System for Use in Preclinical Testing of Host-Directed Therapies for Tuberculosis
Published on: August 16, 2021
Host defense mechanisms against Mycobacterium tuberculosis
Qiyao Chai1,2, Zhe Lu3,4, Cui Hua Liu5,6,7
1CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China. chaiqy@im.ac.cn.
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is a major global health threat. Understanding the complex immune system
Area of Science:
- Immunology
- Infectious Diseases
- Microbiology
Background:
- Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is a leading global infectious disease.
- Mtb primarily infects the lungs, but most exposed individuals control infection via immune responses.
Purpose of the Study:
- To explore the intricate host immune defense system against Mtb.
- To highlight the importance of balanced immunity for controlling TB and preventing tissue damage.
Main Methods:
- Review of host immune responses to Mtb infection.
- Analysis of innate and adaptive immunity components.
- Examination of regulatory mechanisms (genetic, epigenetic, metabolic, neuroendocrine).
Main Results:
- Respiratory mucosal barriers and innate immune cells provide first-line defense.
- Adaptive immunity, involving T and B cells, is crucial for anti-mycobacterial defense.
- Host immune responses are precisely regulated to maintain efficiency and minimize injury.
Conclusions:
- A comprehensive understanding of the integrated host immune system against Mtb is essential.
- This knowledge can inform the development of novel host-directed TB therapeutics.
Related Concept Videos
Defense Against Bacterial Pathogens
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...
Defense Mechanism Against Infection
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
Pulmonary Tuberculosis II
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...
Cell-mediated Immune Responses
Defenses Against Pathogens and Herbivores
Antigens Involved in Adaptive Immunity
Complete Antigens
Complete antigens possess both immunogenicity and...

