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Hepatic lesions and bacterial changes in mice during infection of Fusobacterium necrophorum
Abstract:
Liver abscesses were induced in male albino mice within 1 week after intraperitoneal inoculation of viable Fusobacterium necrophorum LA19 culture. Fusobacteremia was transitory and reached a peak 2 h after inoculation then sharply declined until its disappearance 24 h post inoculation. By contrast, the number of fusobacteria in the liver increased rapidly during the first 4 h post inoculation and continued to do so less rapidly until the last sampling time (48 h post inoculation). There were small or large areas of necrosis, usually surrounded by inflammatory cells, small focal accumulations of lymphocytes, plasma cells, and macrophages in areas of parenchyma with no degenerations, generalized proliferation of Kupffer cells, and a few accumulations of fibrin and leukocytes on the surface. Ultrathin sections of infected liver tissues reveled both intact and partially degraded F. necrophorum cells enclosed in phagocytic and digestive vacuoles of mononuclear cells, The results indicate that macrophages play a key role in the pathogenesis of liver abscesses.
Insights
Macrophages are crucial in developing liver abscesses caused by Fusobacterium necrophorum. This study details the bacterial progression and host immune response in mice, highlighting macrophage activity in combating the infection.
Area of Science:
- Microbiology
- Immunology
- Pathology
Background:
- Liver abscesses pose significant health challenges.
- Fusobacterium necrophorum is a known causative agent of liver abscesses.
Purpose of the Study:
- To investigate the role of macrophages in the pathogenesis of Fusobacterium necrophorum-induced liver abscesses in a murine model.
Main Methods:
- Induction of liver abscesses in male albino mice via intraperitoneal inoculation of Fusobacterium necrophorum.
- Monitoring of bacterial load in blood and liver over 48 hours.
- Histopathological examination of infected liver tissues.
- Ultrastructural analysis of F. necrophorum within host cells.
Main Results:
- Transient bacteremia peaked at 2 hours, disappearing by 24 hours post-inoculation.
- Fusobacteria rapidly increased in the liver within 4 hours, continuing to accumulate up to 48 hours.
- Histopathology revealed necrosis, inflammation, and Kupffer cell proliferation.
- Ultrastructural analysis showed F. necrophorum within phagocytic and digestive vacuoles of mononuclear cells.
Conclusions:
- Macrophages are central to the host's defense against Fusobacterium necrophorum.
- The study elucidates the dynamic interplay between bacterial proliferation and the host immune response in liver abscess formation.