Chronic, relapsing encephalomyelitis associated with experimental measles virus infection

Area of Science:

• Neuroscience
• Virology
• Immunology

Background:

• An experimental central nervous system (CNS) disease similar to human multiple sclerosis was previously induced in hamsters using measles virus.
• The initial understanding suggested the disease was confined to the spinal cord.

Purpose of the Study:

• To demonstrate that the experimental CNS disease also affects the brain.
• To provide a more detailed description of clinical disease manifestations.
• To illustrate histopathological changes and accurately document disease incidence.

Main Methods:

• Induction of experimental CNS disease in hamsters via neonatal infection with a specific measles virus strain.
• Clinical observation and neurological assessment of infected animals.
• Histopathological examination of CNS tissues to identify lesions.

Main Results:

• The experimental disease, now termed chronic relapsing encephalomyelitis (CRE), affects both the brain and spinal cord.
• Approximately 12% of surviving animals develop CRE, with about half exhibiting clinical neurological signs.
• Subclinical CRE cases show histopathological changes including demyelination, necrosis, inflammation, and gliosis.

Conclusions:

• Neonatal measles virus infection in hamsters can induce chronic relapsing encephalomyelitis (CRE).
• CRE is a CNS disease model with similarities to human multiple sclerosis, affecting both brain and spinal cord.
• The study expands the understanding of CRE's pathology, clinical presentation, and incidence.