Measles virus in the brain

Area of Science:

• Neurovirology
• Immunology
• Molecular Genetics

Background:

• Measles virus (MeV) infections manifest in the central nervous system (CNS) as acute postinfectious encephalitis, acute progressive encephalitis (inclusion body encephalitis), and subacute sclerosing panencephalitis (SSPE).
• Postinfectious encephalitis is linked to autoimmune responses, while acute progressive encephalitis involves direct viral attack with compromised cell-mediated immunity.
• SSPE is a late-onset, persistent measles infection with complex viral mechanisms.

Purpose of the Study:

• To review and discuss mechanisms of measles virus persistence in the brain.
• To explore virus-cell interactions in CNS infections using explant cultures and experimental animal models.
• To investigate the role of immune function defects in measles virus brain infection initiation and spread.

Main Methods:

• Analysis of molecular genetic studies on MeV protein expression (matrix, fusion, hemagglutinin) and viral persistence.
• Examination of virus-cell interactions using explant cultures of human and animal neuronal cells.
• In vivo studies using experimental animals, including immunodeficient mice, to model CNS infections.

Main Results:

• Molecular genetic studies identified mechanisms of viral persistence due to defective MeV protein expression, evading immune surveillance.
• Explant cultures provided insights into virus-cell interactions in neuronal cells.
• Animal models, particularly immunodeficient mice, facilitated the study of MeV infection initiation and dissemination in the brain.

Conclusions:

• Defective measles virus protein expression is a key mechanism for viral persistence in the CNS, enabling immune evasion.
• Virus-cell interactions and host immune status critically influence the pathogenesis of measles virus-induced encephalitis.
• Experimental models are crucial for understanding the complex interplay between measles virus and the brain, leading to diverse neurological outcomes.