Related Experiment Videos
A murine model of polymyositis induced by coxsackievirus B1 (Tucson strain)
Abstract:
A murine model of polymyositis induced by coxsackievirus B1, Tucson strain (CVBT) is described. Intraperitoneal CVBT inoculation of CD 1 Swiss mice less than 48 hours old resulted in proximal hindquarter weakness that was first apparent 7 days after viral challenge and persisted for more than 10 weeks. Electromyographic and histologic evidence of a continuing myositis was present during this entire period of time. However, virus was not detectable later than 2 weeks post infection, despite clinical progression of disease. The finding of electromyographic and histologic abnormalities in CVBT-infected mice, long after virus had cleared and neutralizing antibody production evoked, suggests that persistent myositis may be immunologically mediated, triggered by the initial acute viral infection.
Insights
A new mouse model shows coxsackievirus B1 (CVB1) infection causes polymyositis. The disease persists long after the virus clears, suggesting an immune-mediated mechanism.
Area of Science:
- Virology
- Immunology
- Neurology
Background:
- Polymyositis is an inflammatory muscle disease.
- Viral infections can trigger autoimmune conditions.
- Coxsackievirus B1 (CVB1) is a known pathogen.
Purpose of the Study:
- To describe a novel murine model of polymyositis induced by CVB1.
- To investigate the temporal relationship between viral clearance and disease progression.
- To explore the potential immunological basis of persistent myositis.
Main Methods:
- Induction of polymyositis in neonatal CD 1 Swiss mice via intraperitoneal CVB1 inoculation.
- Clinical assessment of hindquarter weakness.
- Electromyographic and histological analysis of muscle tissue.
- Viral detection and antibody assays.
Main Results:
- CVB1 inoculation induced polymyositis with hindquarter weakness in mice.
- Clinical and pathological signs of myositis persisted for over 10 weeks.
- Viral RNA was undetectable after 2 weeks post-infection.
- Neutralizing antibodies were detected, yet disease progressed.
Conclusions:
- Persistent polymyositis in this model occurs after viral clearance.
- The findings suggest an immunologically mediated mechanism triggered by CVB1.
- This murine model is valuable for studying viral-induced myositis and its long-term sequelae.