Related Experiment Videos
Electronmicroscopic studies on the location of salmonella proliferation in the murine spleen
1Department of Microbiology and Immunology, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.
Abstract:
Highly susceptible inbred male C57BL/6 mice were infected intraperitoneally with 2 x 10(7) cfu of a virulent Salmonella typhimurium strain. Tissue sections were taken from the spleen 2 and 3 days after infection for examination by electronmicroscopy. Rapid infiltration of polymorphs and macrophages was evident at the site of infection. These inflammatory phagocytes displayed avid destructive action against ingested bacteria. Bacterial multiplication occurred primarily in extracellular locations within sinusoids or in lesions containing disintegrating host cells.
Insights
Salmonella typhimurium infection rapidly recruits inflammatory cells to the mouse spleen. While phagocytes destroy many bacteria, Salmonella typhimurium also multiplies extracellularly in infected tissues.
Area of Science:
- Immunology
- Microbiology
- Pathology
Background:
- Salmonella typhimurium is a significant bacterial pathogen.
- Understanding host-pathogen interactions is crucial for combating infections.
Purpose of the Study:
- To investigate the early splenic response to Salmonella typhimurium infection in mice.
- To characterize the cellular and extracellular events during acute infection.
Main Methods:
- Infection of C57BL/6 mice with Salmonella typhimurium.
- Electron microscopy analysis of spleen tissue at 2 and 3 days post-infection.
Main Results:
- Rapid infiltration of polymorphonuclear leukocytes and macrophages into the spleen.
- Phagocytic cells demonstrated effective bacterial clearance.
- Salmonella typhimurium primarily multiplied extracellularly within sinusoids and necrotic lesions.
Conclusions:
- Early splenic response involves robust inflammatory cell recruitment.
- Extracellular bacterial proliferation contributes to pathogenesis despite phagocytic activity.