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Ultrastructure of mumps virus replication in organotypic cultures of hamster choroid plexus
Abstract:
Organotypic cultures of newborn hamster choroid plexus were inoculated with equal titre doses of newly isolated or hamster adapted strains of mumps virus. The ultrastructure of virus replication in choroid epithelial cells of the cultures was compared. No qualitative differences were observed; however, the adapted strain produced significantly greater numbers of virions and earlier destruction of the cultures. These findings are consistent with previous in vivo observations of the ultrastructure of the replication of these strains in the newborn hamster central nervous system. This in vitro study leads further support to the hypothesis that differences in the in vivo biological effects of the virus strains are primarily the result of virus-cell rather than virus-host interactions.
Insights
This study compared mumps virus replication in hamster choroid plexus cultures. Adapted strains showed more virions and faster cell damage, supporting virus-cell interaction as key to disease differences.
Area of Science:
- Virology
- Cell Biology
- Neuroscience
Background:
- Mumps virus exhibits varying virulence in vivo.
- Previous studies suggest differences in central nervous system replication.
- The role of virus-cell versus host interactions remains unclear.
Purpose of the Study:
- To investigate the in vitro ultrastructure of mumps virus replication.
- To compare replication between newly isolated and hamster-adapted mumps virus strains.
- To elucidate the primary determinants of differential viral pathogenesis.
Main Methods:
- Organotypic cultures of newborn hamster choroid plexus were utilized.
- Cultures were inoculated with equal titers of distinct mumps virus strains.
- Ultrastructural analysis via electron microscopy was performed to compare virus replication.
Main Results:
- No qualitative differences in virion ultrastructure were observed between strains.
- The hamster-adapted strain produced significantly higher virion numbers.
- The adapted strain led to earlier and more extensive culture destruction.
Conclusions:
- In vitro findings mirror in vivo observations of mumps virus replication.
- Differences in viral biological effects are likely driven by virus-cell interactions.
- This supports the hypothesis that virus-cell interactions, not host factors, primarily dictate mumps virus pathogenesis.