Related Experiment Videos
A non-productive subacute sclerosing panencephalitis (SSPE) virus of human and ferret: an ultrastructural study
Abstract:
A non-productive syncytiogenic measles virus isolated from the brain of an SSPE patient was grown on Vero cells. The ultrastructure of the infected syncytia was studied by electron microscopic and immunoperoxidase techniques. It was compared with the isolate of the virus after passage in ferrets, the Edmonston strain of wild measles virus and the Halle productive strain of SSPE, all on Vero cells. The immunoperoxidase labeling of the cell membranes of the Edmonston measles virus infected cells was very heavy and uniform. In contrast, the labeling of the non-productive SSPE infected cells was clearly discontinuous. In the latter, there was a preponderance of intranuclear over cytoplasmic nucleocapsid formation, whereas cytoplasmic nucleocapsids were prevalent in the virion-producing strains. Many similarities between Vero cells infected with the wild measles virus and the Halle strain of SSPE were observed, although differences between this SSPE strain and strains reported by others were noted.
Insights
This study compares measles virus strains, revealing distinct ultrastructural differences in non-productive SSPE virus compared to wild-type and productive SSPE strains, impacting nucleocapsid formation and cell membrane labeling.
Area of Science:
- Virology
- Cell Biology
- Immunohistochemistry
Background:
- Subacute sclerosing panencephalitis (SSPE) is a severe neurological complication of measles virus infection.
- Understanding the distinct characteristics of SSPE-associated measles virus strains is crucial for comprehending disease pathogenesis.
Purpose of the Study:
- To investigate and compare the ultrastructural and immunocytochemical features of a non-productive SSPE measles virus isolate.
- To differentiate this isolate from wild-type measles virus and a productive SSPE strain using Vero cell cultures.
Main Methods:
- Electron microscopy was employed to examine the ultrastructure of infected Vero cells.
- Immunoperoxidase techniques were used to assess viral antigen distribution on cell membranes.
- Comparative analysis was performed on a non-productive SSPE isolate, a wild measles virus (Edmonston strain), and a productive SSPE strain (Halle strain).
Main Results:
- The non-productive SSPE isolate exhibited discontinuous immunoperoxidase labeling on cell membranes, unlike the uniform labeling of the Edmonston strain.
- Intranuclear nucleocapsid formation predominated in the non-productive SSPE strain, contrasting with cytoplasmic prevalence in productive strains.
- Similarities were observed between wild measles virus and the Halle SSPE strain, though strain-specific differences were noted.
Conclusions:
- The non-productive SSPE measles virus isolate displays unique ultrastructural and cellular localization patterns of viral components.
- These findings highlight distinct replication strategies and cellular interactions of different measles virus strains, potentially influencing SSPE pathogenesis.