Related Experiment Videos
T cells are required for coxsackievirus B1 induced murine polymyositis
S R Ytterberg1, M L Mahowald, R P Messner
1Department of Medicine, Minneapolis Veterans Administration Medical Center, MN 55417.
Abstract:
Murine polymyositis (PM) induced by coxsackievirus B1 (CVB1) has been used as a model of human PM. Our study was undertaken to investigate the role of T cells in CVB1 induced PM by examining disease development in neonatally thymectomized mice. Clinical weakness and histological inflammatory myositis occurred in 42.7% of sham operated animals but only 7.7% of thymectomized mice. These experiments demonstrate the importance of T cells in the pathogenesis of this virus induced autoimmune disorder.
Insights
T cells are crucial for developing coxsackievirus B1-induced polymyositis (PM) in mice. Thymectomized mice showed significantly reduced disease, highlighting T cell importance in this viral autoimmune disorder model.
Area of Science:
- Virology
- Immunology
- Neurology
Background:
- Murine polymyositis (PM) serves as a model for human PM.
- Coxsackievirus B1 (CVB1) is a known inducer of experimental autoimmune myositis in mice.
Purpose of the Study:
- To investigate the role of T cells in the pathogenesis of CVB1-induced murine polymyositis.
- To determine if T cell deficiency impacts disease development in a murine model.
Main Methods:
- Induction of polymyositis in mice using coxsackievirus B1.
- Neonatal thymectomy was performed on a subset of mice to deplete T cells.
- Sham operations were conducted on control mice.
- Clinical assessment of weakness and histological examination of muscle tissue for inflammatory myositis.
Main Results:
- Sham-operated mice developed clinical weakness and histological inflammatory myositis in 42.7% of cases.
- Neonatally thymectomized mice exhibited a significantly lower incidence of disease (7.7%).
- Absence of T cells markedly reduced the development of CVB1-induced myositis.
Conclusions:
- T cells play a critical role in the pathogenesis of coxsackievirus B1-induced polymyositis.
- The study confirms the importance of T cell-mediated immunity in this viral-induced autoimmune disorder model.
- Findings underscore the significance of T cell responses in viral-induced autoimmune diseases.