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Experimental subacute sclerosing panencephalitis: selective disappearance of measles virus matrix protein from the
Abstract:
Subacute sclerosing panencephalitis (SSPE) is caused by a cell-associated or defective form of measles virus. The matrix protein of measles virus may be absent in patients with SSPE which could explain the defective nature of the virus in these patients. In an experimental model of SSPE in hamsters, measles virus in brain tissue is known to convert from a complete infectious form to a cell-associated or defective form eight to 12 days after intracerebral inoculation. Rabbit sera containing antibodies to two individual measles virus polypeptides, the nucleocapsid protein and matrix protein, were used in immunofluorescent and ultrastructural immunoperoxidase studies to label these proteins in brains of hamsters. During the early phase of infection when complete infectious virus could be isolated from brain tissue, both proteins were labeled. However, by 17 days after inoculation, when only cell-associated virus could be rescued from brain tissue, the nucleocapsid protein remained but the matrix protein had disappeared.
Insights
Subacute sclerosing panencephalitis (SSPE) is linked to defective measles virus. The study found the measles matrix protein disappears during SSPE development in hamsters, suggesting its absence contributes to the virus
Area of Science:
- Virology
- Neuroscience
- Immunology
Background:
- Subacute sclerosing panencephalitis (SSPE) is a severe neurological complication of measles virus infection.
- SSPE is associated with a defective or cell-associated form of the measles virus.
- The measles virus matrix protein's role in SSPE pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the presence and role of measles virus matrix protein during the development of SSPE in an experimental hamster model.
- To determine if the absence of the matrix protein correlates with the transition to a defective viral form in the brain.
Main Methods:
- An experimental SSPE model was established in hamsters via intracerebral inoculation of measles virus.
- Immunofluorescent and ultrastructural immunoperoxidase techniques were employed to label viral proteins in hamster brain tissue.
- Antibodies against measles virus nucleocapsid and matrix proteins were used for detection at different time points post-infection.
Main Results:
- In the early phase of infection (8-12 days post-inoculation), both nucleocapsid and matrix proteins were detected in hamster brains.
- At later stages (17 days post-inoculation), when only cell-associated virus was recoverable, the nucleocapsid protein remained detectable, but the matrix protein was absent.
- These findings indicate a selective disappearance of the measles virus matrix protein during the progression of SSPE in this model.
Conclusions:
- The disappearance of the measles virus matrix protein in the hamster brain correlates with the conversion to a cell-associated, defective viral form characteristic of SSPE.
- This selective protein loss suggests that the absence of the matrix protein may be a key factor in the pathogenesis of subacute sclerosing panencephalitis.