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Related Concept Videos

Pulmonary Tuberculosis II01:28

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...
Tuberculosis01:23

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...
Defense Against Bacterial Pathogens01:31

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...
Phagocytosis00:41

Phagocytosis

Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). It is perhaps unsurprising, that many...
Phagocytosis00:41

Phagocytosis

Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells, including...
Pulmonary Tuberculosis I01:29

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...

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Related Experiment Video

Updated: Jul 5, 2026

Study of Phagolysosome Biogenesis in Live Macrophages
08:06

Study of Phagolysosome Biogenesis in Live Macrophages

Published on: March 10, 2014

The Mycobacterium tuberculosis phagosome.

Esteban A Roberts1, Vojo Deretic

  • 1Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, Albuquerque, NM, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

Tuberculosis bacteria prevent macrophage destruction by blocking phagolysosome biogenesis. Researchers identified host GTPases involved in this process, enabling further study of host-pathogen interactions.

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Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Tuberculosis (TB) remains a major global health threat, causing millions of deaths annually.
  • Mycobacterium tuberculosis evades host defenses by disrupting phagolysosome maturation within macrophages.
  • Understanding host-pathogen interactions is critical for developing new TB treatments.

Purpose of the Study:

  • To identify host factors that regulate phagolysosome biogenesis during Mycobacterium tuberculosis infection.
  • To investigate the role of host GTPases in blocking phagolysosome maturation.
  • To establish methods for studying host effector functions in mycobacterial infections.

Main Methods:

  • Utilized macrophage transfection techniques for efficient delivery of genetic material.
  • Investigated the involvement of specific host GTPases in the context of mycobacterial infection.
  • Examined the impact of host factors on phagolysosome biogenesis.

Main Results:

  • Identified specific host GTPases that play a role in preventing phagolysosome biogenesis.
  • Demonstrated the essentiality of efficient macrophage transfection for studying host effector mechanisms.
  • Provided a foundation for further research into host-pathogen interactions in TB.

Conclusions:

  • Host GTPases are key regulators of phagolysosome biogenesis, influencing Mycobacterium tuberculosis survival.
  • Advanced cell-based methods facilitate the study of host factors in infectious diseases.
  • Further research is warranted to explore therapeutic strategies targeting host-pathogen interactions in TB.