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Host genetic factors influence murine cytomegalovirus lung infection and interstitial pneumonitis
Abstract:
We evaluated the influence of host genetic factors on the course of murine cytomegalovirus (MCMV) lung infection after intranasal inoculation and on the development of interstitial pneumonitis after virus and cyclophosphamide (CP) administration. Susceptibility to virus replication in the lungs of various inbred murine strains was inherited as an autosomal dominant trait, which was associated with the H-2 locus. Similarly, the development of MCMV interstitial pneumonitis was inherited as an autosomal dominant, polygenic trait. Susceptibility to lung infection was necessary, but not sufficient for MCMV interstitial pneumonitis. Non-H-2-associated factors were also needed and probably related to CP metabolism or the character of immune recovery after CP administration. Therefore, inheritable host factors influence both susceptibility to MCMV lung infection and the genesis of MCMV interstitial pneumonitis.
Insights
Host genetics significantly impact murine cytomegalovirus (MCMV) lung infections and interstitial pneumonitis. Specific genetic factors, including the H-2 locus, influence susceptibility to MCMV replication and disease development.
Area of Science:
- Immunology
- Genetics
- Virology
Background:
- Murine cytomegalovirus (MCMV) infection can lead to severe lung disease.
- Host genetic background is known to influence viral infections.
- The interplay between MCMV, host genetics, and immunosuppression (cyclophosphamide) in lung pathology requires further elucidation.
Purpose of the Study:
- To investigate the role of host genetic factors in MCMV lung infection.
- To determine the genetic basis of MCMV-induced interstitial pneumonitis following cyclophosphamide administration.
- To identify specific genetic loci associated with MCMV susceptibility and disease severity.
Main Methods:
- Intranasal inoculation of MCMV in various inbred murine strains.
- Administration of cyclophosphamide (CP) in conjunction with MCMV.
- Assessment of viral replication in the lungs.
- Evaluation of interstitial pneumonitis development.
Main Results:
- Susceptibility to MCMV lung replication is an autosomal dominant trait linked to the H-2 locus.
- Development of MCMV interstitial pneumonitis is an autosomal dominant, polygenic trait.
- Lung infection susceptibility is necessary but not sufficient for pneumonitis; non-H-2 factors also play a role, potentially related to CP metabolism or immune recovery.
Conclusions:
- Inheritable host genetic factors critically influence susceptibility to MCMV lung infection.
- Host genetics also play a significant role in the development of MCMV-induced interstitial pneumonitis.
- Both H-2-linked and non-H-2-linked genetic factors contribute to MCMV lung pathogenesis.