Related Experiment Videos
Beta-endorphin protects mice from neurological disease induced by the murine coronavirus MHV-JHM
1Department of Neurology, USC School of Medicine, Los Angeles 90033.
Abstract:
The neurotropic murine coronavirus, MHV-JHM (JHMV) causes encephalitis and paralytic-demyelinating disease in susceptible strains of mice and rats, serving as a model for human demyelinating diseases such as multiple sclerosis. In this communication, we report that a single intracerebral administration of the naturally occurring neuropeptide, beta-endorphin, reduced the incidence of JHMV-induced paralytic-demyelinating disease 40-50% in C57Bl/6 mice. Protection from disease was accompanied by significantly reduced virus replication in the brain as early as 3 days post-infection and did not occur in irradiated, or immunoincompetent mice. The data suggest that beta-endorphin engages immune mechanisms of host resistance to JHMV infection to protect the mice from disease.
Insights
Beta-endorphin administration reduced the incidence of JHMV-induced paralytic disease in mice. This protection involved immune mechanisms and reduced viral replication in the brain.
Area of Science:
- Neuroscience
- Immunology
- Virology
Background:
- Murine coronavirus JHMV (JHMV) causes encephalitis and paralytic-demyelinating disease in mice, modeling human demyelinating conditions like multiple sclerosis.
- Beta-endorphin is a naturally occurring neuropeptide with potential immunomodulatory functions.
Purpose of the Study:
- To investigate the therapeutic potential of beta-endorphin against JHMV-induced neurological disease.
- To elucidate the mechanisms underlying beta-endorphin's protective effects.
Main Methods:
- Intracerebral administration of beta-endorphin in C57Bl/6 mice infected with JHMV.
- Assessment of disease incidence, viral replication in the brain, and impact of immune status (irradiated/immunoincompetent mice).
Main Results:
- A single intracerebral dose of beta-endorphin reduced JHMV-induced paralytic disease incidence by 40-50%.
- Protection correlated with significantly reduced viral replication in the brain by day 3 post-infection.
- Beta-endorphin's protective effect was dependent on an intact immune system, as it was not observed in irradiated or immunoincompetent mice.
Conclusions:
- Beta-endorphin confers significant protection against JHMV-induced paralytic-demyelinating disease in a susceptible mouse model.
- The protective mechanism involves the engagement of host immune responses and suppression of viral replication.
- These findings suggest beta-endorphin as a potential therapeutic agent for viral encephalitis and demyelinating diseases.