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Interferon as a defence mechanism in mouse cytomegalovirus infection
Abstract:
Mouse cytomegalovirus (MCMV) grew to higher titres in spleen, liver, kidney and salivary gland of mice, and caused more sickness and death in susceptible (CD1) mice following treatment with anti-interferon globulin (AIG). In the resistant (C3H) strain of mice, organ titres were higher following AIG treatment but there was no sickness or mortality. Spleen necrosis was more severe in AIG-treated mice, indicating that this necrosis was not caused by interferon-mediated activation of natural killer (NK) cells. CD1 mice developed a high level of NK activity during MCMV infection and this was greatly reduced by AIG treatment. AIG was equally effective in increasing virus titres in NK-deficient beige (bg/bg) C57 B1.6 mice which showed a low level of NK activity even after MCMV infection, suggesting that interferon protects against MCMV by its direct antiviral effect on cells rather than by activating NK cells.
Insights
Anti-interferon globulin (AIG) treatment increased mouse cytomegalovirus (MCMV) replication and disease severity in susceptible mice. Interferon likely protects against MCMV via direct antiviral effects, not NK cell activation.
Area of Science:
- Virology
- Immunology
Background:
- Mouse cytomegalovirus (MCMV) is a significant pathogen.
- Interferon plays a crucial role in antiviral immunity.
- Natural killer (NK) cells are important in innate antiviral responses.
Purpose of the Study:
- To investigate the role of interferon in controlling MCMV infection.
- To determine whether interferon's protective effect against MCMV is mediated by NK cell activation.
Main Methods:
- Mice (susceptible CD1, resistant C3H, and NK-deficient beige C57 B1.6) were treated with anti-interferon globulin (AIG).
- Viral titers in spleen, liver, kidney, and salivary gland were measured.
- Sickness, mortality, and NK cell activity were assessed.
Main Results:
- AIG treatment increased MCMV titers and disease severity in susceptible mice.
- Spleen necrosis was more severe in AIG-treated mice, independent of NK cell activity.
- AIG treatment increased MCMV titers in NK-deficient mice, suggesting a direct antiviral effect of interferon.
Conclusions:
- Interferon confers protection against MCMV infection primarily through direct antiviral mechanisms on cells.
- Interferon's role in activating NK cells is not the main pathway for MCMV control.