Related Experiment Video
Updated: Apr 24, 2026
12:30
Use of Galleria mellonella as a Model Organism to Study Legionella pneumophila Infection
Published on: November 22, 2013
41.7K
[Host-pathogen interaction of Legionella pneumophila]
1International Research Center for Infectious Diseases, Research Institute for Microbial Diseases, Osaka University.
Nihon Saikingaku Zasshi. Japanese Journal of Bacteriology
|September 5, 2014
Summary
Legionella bacteria cause Legionellosis pneumonia by injecting effector proteins into host cells. This review covers recent research on how these bacteria interact with eukaryotic cells at a molecular level.
Area of Science:
- Microbiology
- Cell Biology
- Pathogenesis
Context:
- Legionella are gram-negative bacteria found in aquatic environments.
- Inhalation can lead to Legionellosis, a severe pneumonia.
- The Dot/Icm type IV secretion system is crucial for bacterial pathogenesis.
Purpose:
- To review recent advances in understanding Legionella-eukaryotic-cell interactions.
- To highlight the molecular mechanisms involved in bacterial pathogenesis.
Summary:
- Legionella bacteria utilize the Dot/Icm type IV secretion system to translocate approximately 300 effector proteins into host cells.
- These translocated effectors are central to the pathogenesis of Legionella infection.
- Recent research focuses on the intricate molecular details of these host-pathogen interactions.
Impact:
- Provides insights into the molecular basis of Legionella pathogenesis.
- Informs potential therapeutic strategies against Legionellosis.
- Advances the understanding of bacterial effector protein translocation and host cell manipulation.
Related Concept Videos
01:25Colonisation of Pathogens
71
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
71
01:14Atypical Pneumonia
77
Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease...
77
01:31Defense Against Bacterial Pathogens
3.0K
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...
3.0K
01:22Microbial Interactions: Parasitism
104
Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
104
01:29Pneumonia II: Pathophysiology
4.5K
The pathophysiology of pneumonia involves the following steps:
4.5K
01:20Infection
11.2K
When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
11.2K