Viral and bacterial antibody responses in multiple sclerosis

Area of Science:

• Neurology
• Immunology
• Infectious Diseases

Background:

• Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system.
• The role of intrathecal antibody synthesis in MS pathogenesis is not fully understood.
• Oligoclonal immunoglobulin G (IgG) bands in cerebrospinal fluid (CSF) are a hallmark of MS.

Purpose of the Study:

• To characterize antibodies to specific viral and bacterial antigens in the CSF of MS patients.
• To investigate the association between intrathecal antibody synthesis and MS characteristics.
• To determine if these antibodies contribute to the oligoclonal IgG in MS CSF.

Main Methods:

• Imprint electroimmunofixation (IEIF) was employed to detect antibodies.
• Serum and CSF samples were analyzed from 12 MS patients and 12 age/sex-matched controls.
• Antibodies to eight viral and four bacterial antigens were assessed.

Main Results:

• Intrathecal synthesis of antibodies to one or more antigens was detected in all 12 MS patients and one control.
• Antibodies to neurotropic viruses were more frequently synthesized intrathecally in MS patients.
• The presence and type of locally synthesized antibodies did not correlate with disease duration or severity.
• These antibodies were not associated with oligoclonal CSF IgG and represented a minor fraction of it.

Conclusions:

• Intrathecal antibody synthesis to specific antigens is common in multiple sclerosis.
• Neurotropic viral antigens are frequently targeted by this local immune response.
• The identified antibodies do not appear to be the primary drivers of oligoclonal IgG in MS CSF or correlate with disease progression.