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Adenovirus-transformed cells restrict Herpes simplex virus replication
Abstract:
A cell line that normally supports the replication of herpes simplex virus types 1 and 2 became resistant to these viruses after transformation by simian adenovirus 7. Kinetic studies of the mechanism of resistance demonstrated that both herpesviruses were able to attach to the transformed cells and express some early genomic functions, as demonstrated by the presence of low levels of viral thymidine kinase. However, isopycnic centrifugation studies of the abortive system failed to detect viral deoxyribonucleic acid synthesis, whereas indirect immunofluorescent studies of viral proteins revealed that less than 10 per cent of the cells contained these viral macromolecules at any given time. Collectively the data suggest that after transformation by simian adenovirus 7 these cells are altered so as to render them resistant or incapable of supporting the growth of herpes simplex virus types 1 and 2. The results further suggest that the block occurs after viral absorption and prior to viral deoxyribonucleic acid synthesis.
Insights
Simian adenovirus 7 transformed cells resist herpes simplex virus replication. The block occurs after viral attachment but before viral DNA synthesis, indicating a novel antiviral mechanism.
Area of Science:
- Virology
- Cell Biology
- Molecular Biology
Background:
- Herpes simplex virus (HSV) types 1 and 2 are common human pathogens.
- Cell lines are crucial models for studying viral replication and host-pathogen interactions.
Purpose of the Study:
- To investigate the mechanism by which simian adenovirus 7 (SA7) transformation confers resistance to HSV-1 and HSV-2 infection in a susceptible cell line.
- To identify the stage of the viral life cycle at which replication is inhibited.
Main Methods:
- Cell culture and viral infection assays.
- Kinetic studies to analyze viral attachment and early gene expression.
- Isopycnic centrifugation to assess viral DNA synthesis.
- Indirect immunofluorescence to detect viral protein expression.
Main Results:
- Transformed cells supported initial viral attachment and some early genomic functions, evidenced by low levels of viral thymidine kinase.
- Viral deoxyribonucleic acid (DNA) synthesis was not detected in the abortive system.
- Less than 10% of cells showed detectable viral proteins via indirect immunofluorescence.
Conclusions:
- SA7 transformation alters cells, rendering them resistant to HSV-1 and HSV-2.
- The resistance mechanism involves a block in viral replication after attachment but prior to viral DNA synthesis.