Macrophage function during Trypanosoma musculi infection in mice
Infection and Immunity
|November 1, 1981
Summary
Peritoneal macrophages in mice infected with Trypanosoma musculi showed increased numbers, size, and hydrogen peroxide release during infection, suggesting cell activation. These changes normalized post-infection.
Area of Science:
- Immunology
- Parasitology
- Cell Biology
Background:
- Peritoneal macrophages play a crucial role in the host immune response to parasitic infections.
- Trypanosoma musculi infection in mice provides a model to study host-parasite interactions at the cellular level.
Purpose of the Study:
- To investigate the quantitative and functional alterations in peritoneal macrophages during Trypanosoma musculi infection.
- To assess the role of these macrophages in the host's response to the parasite.
Main Methods:
- Mice were infected with Trypanosoma musculi.
- Peritoneal macrophages were isolated and analyzed for number, size, and protein content.
- Hydrogen peroxide (H2O2) release and 99mTc colloidal uptake by macrophages were measured.
- Parasitemia levels were monitored throughout the infection course.
Main Results:
- A significant increase in the number, size, and protein content of peritoneal macrophages was observed during parasitemia.
- Elevated induced release of hydrogen peroxide (H2O2) by macrophages correlated with parasitemia.
- Macrophage uptake of 99mTc colloidal particles also showed a correlation with parasitemia.
- H2O2 release returned to baseline levels after the clearance of infection.
Conclusions:
- The observed changes in peritoneal macrophages, including increased size, number, and enhanced function (H2O2 release, colloidal uptake), indicate macrophage activation during Trypanosoma musculi infection.
- These activated macrophages likely contribute to the host's defense mechanisms against the parasite.
- The findings suggest a dynamic interplay between the parasite and the peritoneal macrophage population during infection.
