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Related Concept Videos

Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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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...
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Pulmonary Tuberculosis I01:29

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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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Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

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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...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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...
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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:
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Related Experiment Video

Updated: Oct 9, 2025

Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF1
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Published on: February 28, 2025

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Aggregated Mycobacterium tuberculosis Enhances the Inflammatory Response.

Hylton E Rodel1,2, Isabella A T M Ferreira1, Carly G K Ziegler3,4,5,6

  • 1Africa Health Research Institute, Durban, South Africa.

Frontiers in Microbiology
|December 20, 2021
PubMed
Summary

Mycobacterium tuberculosis (Mtb) aggregation enhances inflammation and macrophage death, promoting Mtb replication. This suggests Mtb aggregation is a key mechanism in tuberculosis pathogenesis and transmission.

Keywords:
Mycobacterium tuberculosisTB pathogenesisTNF-alphaaggregationinflammationphagocytosis

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Area of Science:

  • Immunology
  • Microbiology
  • Pathogenesis

Background:

  • Mycobacterium tuberculosis (Mtb) bacilli exhibit aggregation behavior.
  • Mtb aggregates were previously shown to cause phagocyte death and subsequent bacterial replication.

Purpose of the Study:

  • To investigate the transcriptional response of human macrophages to aggregated Mtb versus non-aggregated Mtb.
  • To elucidate the role of Mtb aggregation in tuberculosis pathogenesis.

Main Methods:

  • Comparative analysis of transcriptional profiles in human monocyte-derived macrophages after infection with aggregated or non-aggregated Mtb.
  • Assessment of phagosome acidification and macrophage cell death.
  • Observation of Mtb aggregates in patient granulomas.

Main Results:

  • Infection with aggregated Mtb induced early upregulation of pro-inflammatory genes and enhanced TNFα signaling via the NFκB pathway compared to non-aggregated Mtb.
  • Phagocytosis of Mtb aggregates resulted in decreased phagosome acidification and increased macrophage cell death.
  • Heat-killed Mtb aggregates did not induce significant cell death, indicating a role for viable bacilli.

Conclusions:

  • Mtb aggregation significantly enhances pro-inflammatory responses and macrophage death, contributing to Mtb pathogenesis.
  • Mtb aggregation may facilitate increased bacterial growth, cell necrosis, and transmission, potentially driving active tuberculosis disease.
  • Mtb aggregation represents a potential mechanism for disease progression and spread.