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Multigenic evasion of inflammation by poxviruses
G J Palumbo1, R M Buller, W C Glasgow
1Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
Journal of Virology
|March 1, 1994
Summary
Cowpox virus (CPV-BR) mutants reveal at least three genes that suppress inflammation in chicken embryos. Deleting these anti-inflammatory genes reduces virus virulence in mice, highlighting their role in host defense evasion.
Area of Science:
- Virology
- Immunology
- Genetics
Background:
- Cowpox virus (CPV-BR) possesses genes that modulate host inflammatory responses.
- Understanding these genes is crucial for comprehending virus-host interactions and pathogenesis.
Purpose of the Study:
- To identify CPV-BR genes that inhibit inflammatory responses in a chicken embryo model.
- To investigate the impact of these genes on virus replication, virulence, and host defense.
Main Methods:
- Analysis of CPV-BR mutants with deletions in specific genes.
- Assessment of inflammatory responses in the chicken embryo chorioallantoic membrane (CAM) model.
- Measurement of virus yields and attenuation in mice.
Main Results:
- At least three non-essential viral genes inhibit inflammation in the CAM model.
- The 38-kDa protein (crmA) and an unidentified gene are key anti-inflammatory factors.
- Deletion of these genes reduced inflammatory response magnitude, decreased virus yields, and attenuated virulence in mice.
Conclusions:
- CPV-BR encodes multiple host defense modifiers that suppress inflammation.
- Inhibition of inflammation enhances viral replication and potentially facilitates transmission.
- These findings contribute to understanding poxvirus immune evasion strategies.