Restricted expression of measles virus proteins in brains from cases of subacute sclerosing panencephalitis
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Abstract:
The presence of five structural proteins of measles virus in brain material obtained at autopsy from four patients with subacute sclerosing panencephalitis (SSPE) was examined by immunofluorescence employing monoclonal antibodies. In addition, the humoral immune response against measles virus antigens in serum and cerebrospinal fluid was analysed by immunoprecipitation in combination with gel electrophoresis, revealing a reduced response mainly to the matrix (M) protein. In none of the brain material were all five structural proteins simultaneously detected. Nucleocapsid protein and phosphoprotein were found in every diseased brain area, whereas haemagglutinin (H) protein was detected in two, fusion (F) protein in three and M protein only in one SSPE case. In two cases, variations in the occurrence of H and F proteins could be observed between regions displaying different degrees of neuropathological changes. No correlation was observed between the humoral immune response and the immunohistological findings. These data support the hypothesis of a restricted synthesis of measles virus proteins, in particular the envelope and M proteins, in SSPE.
Insights
Subacute sclerosing panencephalitis (SSPE) shows restricted measles virus protein synthesis, particularly envelope and matrix (M) proteins. This study found limited viral protein expression in brain tissue from SSPE patients.
Area of Science:
- Neurology
- Virology
- Immunology
Background:
- Subacute sclerosing panencephalitis (SSPE) is a severe, late complication of measles virus infection.
- The precise mechanisms of persistent measles virus replication and protein expression in SSPE brains remain incompletely understood.
Purpose of the Study:
- To investigate the presence and distribution of measles virus structural proteins in SSPE brain tissue.
- To analyze the humoral immune response against measles virus antigens in SSPE patients.
- To correlate immunohistological findings with the humoral immune response.
Main Methods:
- Immunofluorescence using monoclonal antibodies to detect measles virus structural proteins (nucleocapsid, phosphoprotein, hemagglutinin, fusion, matrix) in autopsy brain samples.
- Immunoprecipitation and gel electrophoresis to analyze serum and cerebrospinal fluid for antibodies against measles virus antigens.
Main Results:
- Not all five measles virus structural proteins were simultaneously detected in any SSPE brain sample.
- Nucleocapsid and phosphoprotein were consistently found, while hemagglutinin, fusion, and matrix proteins showed variable detection.
- A reduced humoral immune response, primarily to the matrix (M) protein, was observed in SSPE patients.
Conclusions:
- The findings support a hypothesis of restricted measles virus protein synthesis in SSPE.
- Limited expression of envelope and matrix (M) proteins may play a role in the pathogenesis of SSPE.