[Multiple sclerosis: review of main experimental data and pathogenic hypotheses]

Area of Science:

• Neuroimmunology
• Genetics
• Virology

Context:

• Multiple sclerosis (MS) is a chronic demyelinating disease of the central nervous system.
• The exact cause of MS remains elusive, prompting investigation into multiple contributing factors.
• Familial forms and specific HLA types suggest a genetic predisposition.

Purpose:

• To review and synthesize current understanding of MS pathogenesis from genetic, viral, and immunological perspectives.
• To discuss the role of oligodendrocytes, viral infections (e.g., measles), and immune responses in MS.
• To explore insights gained from experimental allergic encephalomyelitis (EAE) models for understanding MS mechanisms and potential therapies.

Summary:

• Genetic factors, including familial clustering and HLA associations, play a role in MS susceptibility.
• Viral infections, particularly measles, are investigated as potential triggers, evidenced by intrathecal antibody production and viral DNA.
• Immunological mechanisms, studied via EAE models, highlight myelin basic protein, M2 antigen, and galactocerebroside antibodies as targets, though direct demyelinating activity of MS cerebrospinal fluid antibodies is unclear. Endothelial cells and astrocytes may also contribute to lesion formation.

Impact:

• Understanding the multifactorial pathogenesis of MS can guide the development of targeted therapies.
• Investigating viral and immunological triggers may lead to preventative strategies or novel treatment approaches.
• Insights from EAE models offer a framework for exploring immunomodulatory and immunosuppressive treatments for MS.