Related Experiment Videos
Activation of reticuloendothelial cells following infection with murine cytomegalovirus
Abstract:
Macrophage and reticuloendothelial system function was investigated in adult, female C3H mice during the course of a nonlethal infection with murine cytomegalovirus (MCMV). Peritoneal macrophages harvested from mice infected three to 21 days previously were tumoricidal in vitro for a syngeneic mammary tumor cell line and showed antiviral activity by suppressing replication of vaccinia virus in a fibroblast monolayer. In addition, macrophages harvested from animals on days 7 and 14 after MCMV infection manifested augmented phagocytosis of yeast particles in vitro. Furthermore, enhanced levels of chemiluminescence were emitted during phagocytosis of zymosan particles by macrophages harvested on days 3 and 7 after MCMV infection. Finally, enhanced protection against Listeria monocytogenes was demonstrated in mice on days 7, 14, and 21 after MCMV infection. These findings support the concept of activation of the reticuloendothelial system during viral infection.
Insights
Murine cytomegalovirus (MCMV) infection activates macrophage and reticuloendothelial system function in mice. This viral infection enhances immune cell activity, including tumoricidal and antiviral properties, improving host defense.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Viral infections can significantly modulate host immune responses.
- The reticuloendothelial system, including macrophages, plays a critical role in host defense against pathogens.
- Understanding immune system activation during viral infections is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the functional changes in macrophage and reticuloendothelial system activity during murine cytomegalovirus (MCMV) infection.
- To assess the impact of MCMV infection on macrophage tumoricidal and antiviral capabilities.
- To evaluate alterations in phagocytosis, chemiluminescence, and host protection against bacterial infection.
Main Methods:
- Adult female C3H mice were infected with a nonlethal dose of MCMV.
- Peritoneal macrophages were harvested at various time points post-infection (3-21 days).
- In vitro assays were performed to assess tumoricidal activity, antiviral activity, phagocytosis, and chemiluminescence. In vivo protection against Listeria monocytogenes was also evaluated.
Main Results:
- Macrophages from MCMV-infected mice exhibited enhanced tumoricidal activity against a syngeneic mammary tumor cell line.
- Antiviral activity was demonstrated by suppressed vaccinia virus replication in fibroblast monolayers.
- Augmented phagocytosis of yeast particles and enhanced chemiluminescence during zymosan particle phagocytosis were observed.
- Mice showed increased protection against Listeria monocytogenes infection post-MCMV infection.
Conclusions:
- Murine cytomegalovirus infection leads to the activation of macrophage and reticuloendothelial system functions.
- Activated macrophages display enhanced tumoricidal, antiviral, and phagocytic capabilities.
- These findings support the concept of reticuloendothelial system activation during viral infections, contributing to improved host defense.