Circulating immune complexes in patients with subacute sclerosing panencephalitis.

Area of Science:

• Neurology
• Immunology
• Virology

Background:

• Subacute sclerosing panencephalitis (SSPE) is a rare, progressive neurological disorder.
• The pathogenesis of SSPE is linked to persistent measles virus infection.
• The role of immune complexes (ICs) in SSPE has not been fully elucidated.

Purpose of the Study:

• To investigate the presence and characteristics of immune complexes (ICs) in patients with subacute sclerosing panencephalitis (SSPE).
• To determine if ICs in SSPE patients contain measles virus antigens.
• To analyze the fluctuation of IC levels in serum and cerebrospinal fluid (CSF).

Main Methods:

• Solid-phase C1q radioimmunoassay was used to measure IC levels in serum and CSF specimens.
• ICs were isolated from CSF using C1q immobilized to Affi-Gel.
• Measles virus antigens within ICs were identified using specific antisera and Western blotting.

Main Results:

• 46% of serum specimens (36/78) from SSPE patients were positive for ICs.
• Fluctuating IC levels were observed in serum and CSF specimens from multiple patients.
• Analysis of isolated ICs revealed the presence of measles virus polymerase, nucleoprotein, and hemagglutinin antigens.

Conclusions:

• SSPE patients frequently have detectable immune complexes (ICs) in their serum and CSF.
• Immune complex levels in SSPE patients exhibit significant fluctuation over time.
• Measles virus antigens are a component of immune complexes found in SSPE, suggesting their involvement in the disease process.