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Effect of interferon-alpha on immediate early gene expression of murine cytomegalovirus
M G Martinotti1, G Gribaudo, M Gariglio
1Institute of Microbiology, School of Medicine, University of Turin, Italy.
Abstract:
Interferon-alpha (IFN-alpha) significantly reduced the replication of murine cytomegalovirus (MCMV) in mouse embryo fibroblasts derived from the susceptible mouse strain C3H/HeJ. When infectious virus production was measured, a strong decrease in virus titer was observed in IFN-treated cells at a multiplicity of infection (moi) of 1 and 0.5 pfu/cell. Analysis of virus-specified mRNAs by Northern blot assay revealed that IFN-alpha had a significant effect on the expression of viral mRNAs at 48h. In particular, the mRNAs of the major immediate early (IE) transcription units, IE1, IE2, and IE3, were impaired by IFN-alpha. In addition, decrease of IE1 mRNA synthesis was accompanied by a reduction of the major IE product (pp89), as revealed by Western blot assay. These results suggest that IFN-alpha may inhibit MCMV replication by directly impairing IE gene transcription.
Insights
Interferon-alpha (IFN-alpha) effectively reduced murine cytomegalovirus (MCMV) replication in cell cultures. This antiviral effect appears to stem from IFN-alpha
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Murine cytomegalovirus (MCMV) is a significant pathogen in susceptible mouse strains.
- Interferon-alpha (IFN-alpha) is a known antiviral cytokine.
- Understanding the molecular mechanisms of IFN-alpha's antiviral activity is crucial.
Purpose of the Study:
- To investigate the effect of Interferon-alpha (IFN-alpha) on Murine Cytomegalovirus (MCMV) replication.
- To elucidate the molecular mechanisms by which IFN-alpha inhibits MCMV.
- To analyze the impact of IFN-alpha on viral gene expression.
Main Methods:
- Infection of C3H/HeJ mouse embryo fibroblasts with MCMV at varying multiplicities of infection (moi).
- Treatment of infected cells with Interferon-alpha (IFN-alpha).
- Measurement of infectious virus production (titer).
- Analysis of viral mRNA expression using Northern blot.
- Analysis of viral protein expression using Western blot.
Main Results:
- IFN-alpha significantly reduced MCMV replication and infectious virus production.
- IFN-alpha treatment markedly decreased viral mRNA levels at 48 hours post-infection.
- Specifically, mRNAs for major immediate-early (IE) transcription units (IE1, IE2, IE3) were impaired.
- Reduced IE1 mRNA synthesis correlated with decreased production of the major IE product (pp89).
Conclusions:
- IFN-alpha effectively inhibits MCMV replication in susceptible mouse cells.
- The antiviral mechanism involves the direct impairment of immediate-early (IE) gene transcription.
- This suggests a critical role for IE gene regulation in IFN-alpha's antiviral response against MCMV.