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Effects of antiviral agents on murine cytomegalovirus-induced macrophage dysfunction
Abstract:
Infection of murine peritoneal macrophages with murine cytomegalovirus (MCMV) led to disruption of phagocytosis. This alteration of cellular behavior appeared to be an early event in viral replication appearing 24 to 36 h before virus production and 84 to 108 h before cell death. The effects of a variety of antiviral agents on both MCMV replication and MCMV-induced depression of phagocytosis were evaluated in vitro. Although all compounds thought to act by preventing viral DNA replication inhibited MCMV replication in macrophages, none prevented expression of virus-induced alteration of phagocytosis. Cycloheximide at 1 microM blocked viral replication and viral antigen expression and prevented depression of phagocytic activity.
Insights
Murine cytomegalovirus (MCMV) infection disrupts macrophage phagocytosis early in replication. Cycloheximide blocked viral replication and prevented this phagocytic dysfunction, unlike other antivirals.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Murine cytomegalovirus (MCMV) is a pathogen that infects macrophages.
- MCMV infection can impair macrophage functions, including phagocytosis.
- The timing and mechanisms of MCMV-induced phagocytosis disruption are not fully understood.
Purpose of the Study:
- To investigate the impact of MCMV infection on macrophage phagocytosis.
- To determine the temporal relationship between MCMV replication and phagocytosis impairment.
- To evaluate the efficacy of antiviral agents in preventing MCMV-induced phagocytosis dysfunction.
Main Methods:
- Infection of murine peritoneal macrophages with MCMV.
- Assessment of phagocytic activity at various time points post-infection.
- Treatment with different antiviral agents targeting viral replication.
- Evaluation of viral replication and antigen expression.
Main Results:
- MCMV infection led to a significant disruption of macrophage phagocytosis.
- Phagocytosis impairment occurred early, preceding viral production and cell death.
- Antivirals inhibiting viral DNA replication did not prevent phagocytosis alteration.
- Cycloheximide (1 microM) blocked MCMV replication, antigen expression, and preserved phagocytic activity.
Conclusions:
- MCMV-induced phagocytosis dysfunction is an early event in infection.
- Disruption of phagocytosis is independent of viral DNA replication.
- Cycloheximide demonstrates potential in preventing MCMV-mediated immune evasion by preserving phagocytosis.