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In vivo Junin virus-mouse macrophages interaction.
O E Campetella1, A Sanchez, O A Giovanniello
1Departamento de Microbiologia, Facultad de Medicina, Universidad de Buenos Aires, Argentina.
Acta Virologica
|May 1, 1988
Summary
Mononuclear phagocytic cells, including macrophages, replicate Junin virus (JV) in mice, promoting inflammation without C3 receptor involvement. The macrophage barrier did not influence disease severity in this extraneural infection model.
Area of Science:
- Virology
- Immunology
- Cell Biology
Background:
- Junin virus (JV) causes extraneural infections.
- Mononuclear phagocytic cells play a role in host defense and viral pathogenesis.
- The interaction between JV and macrophages, particularly concerning C3 receptor function, requires further elucidation.
Purpose of the Study:
- To investigate the role of mononuclear phagocytic cells, specifically macrophages, in extraneural Junin virus infection in mice.
- To assess the permissiveness of macrophages to JV replication in vivo and in vitro.
- To examine the involvement of the C3 receptor pathway in JV infection and macrophage function.
Main Methods:
- Intraperitoneal inoculation of suckling mice with Junin virus.
- Immunofluorescence (IF) assays to detect viral replication and C3 marker.
- C3 receptor assays to evaluate receptor function.
- In vitro infection of macrophages.
- Silica treatment to modulate macrophage activity.
Main Results:
- Macrophages were permissive to Junin virus replication both in vivo and in vitro.
- Viral infection led to the recruitment of inflammatory cells, indicated by the absence of the C3 marker.
- No alterations in C3 receptor function were observed during in vitro infection.
- C3-mediated phagocytosis was not evident in either in vivo or in vitro settings.
- Silica treatment did not affect host resistance or susceptibility to JV infection.
Conclusions:
- Macrophages are permissive to Junin virus replication and contribute to inflammatory cell recruitment during extraneural infection.
- The C3 receptor pathway does not appear to be involved in Junin virus pathogenesis or macrophage-mediated phagocytosis in this model.
- The "macrophage-barrier" does not significantly influence the course of Junin virus disease, suggesting alternative mechanisms of viral spread or immune evasion.