Coronaviruses in brain tissue from patients with multiple sclerosis

Area of Science:

• Neurovirology
• Infectious Diseases
• Neurology

Background:

• Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system.
• The potential role of viral infections, including human coronaviruses (HCoVs), in the pathogenesis of MS remains an area of investigation.
• Specific HCoV strains, such as 229E and OC43, have been detected in various human tissues.

Purpose of the Study:

• To investigate the presence and potential chronic infection of human coronavirus strains 229E and OC43 in brain tissue from patients with multiple sclerosis (MS).
• To compare the prevalence of HCoV RNA in MS brain tissue versus non-neurological disease control brain tissue.

Main Methods:

• Brain tissue samples were obtained from 25 patients with clinically definite MS and 36 controls without neurological disease.
• Polymerase Chain Reaction (PCR) assays were employed using primers specific for the N-protein of HCoV-229E and the nucleocapsid protein of HCoV-OC43.
• Reproducibility of positive PCR results was assessed, and comparisons were made between MS patients and control groups.

Main Results:

• Sporadic positive PCR signals for HCoV were detected in both MS patients and control groups.
• These positive signals were not reproducible across repeated assays.
• There was no statistically significant difference in the proportion of positive signals between the MS patient group and the control group.

Conclusions:

• This study did not find evidence supporting a chronic infection with human coronavirus strains 229E or OC43 in the brain tissue of patients with multiple sclerosis.
• The observed sporadic positive PCR results were likely due to non-specific amplification or contamination and did not indicate a consistent viral presence in MS brain tissue.
• Further research may be needed to explore other potential viral etiologies or pathogenetic mechanisms in multiple sclerosis.