Measles viral load may reflect SSPE disease progression

Area of Science:

• Neurology
• Virology
• Pathology

Background:

• Subacute sclerosing panencephalitis (SSPE) is a rare, progressive neurological disorder.
• It is caused by persistent infection with the measles virus (MV).
• The exact pathology of SSPE remains poorly understood despite extensive research.

Purpose of the Study:

• To investigate the viral load and distribution of measles virus (MV) in the central nervous system (CNS) of SSPE patients.
• To explore the correlation between viral burden and disease progression in SSPE.

Main Methods:

• Autopsy tissues from eight SSPE patients were analyzed.
• Techniques included real-time quantitative PCR, immunohistochemistry, and immunoblotting.
• Viral load was quantified by measuring MV gene RNA and detecting MV proteins.

Main Results:

• Measles virus (MV) N, M, and H gene RNA were detected in the CNS of all eight SSPE patients.
• MV RNA was also found in two non-CNS tissues from one patient.
• Quantitative PCR revealed up to a four-fold difference in viral burden among patients, correlating with MV protein detection.
• Higher levels of viral RNA and antigen in the brain appeared to correlate with disease progression.

Conclusions:

• Measles virus (MV) is consistently present in the central nervous system (CNS) of SSPE patients.
• The quantification of viral RNA and protein provides insights into SSPE pathology.
• Viral load in the brain may be a significant factor in the progression of subacute sclerosing panencephalitis (SSPE).