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Prevention of myonecrosis in mdx mice: effect of immobilization by the local tetanus method
1Department of Neuropediatrics, Tokyo Metropolitan Neurological Hospital, Japan.
Abstract:
Sixteen mdx mice of three-week-old were injected with tetanus toxin into the right gastrocnemius muscle and then subjected to sustained dorsiflexion of the right ankle joint (local tetanus) for 2 to 56 days. Another 16 mdx mice of the same age were not injected with tetanus toxin, serving as controls. The incidence of centronucleated muscle fibers, which indicate preceding myodegeneration, was significantly reduced in the tetanus toxin injected soleus muscle (SOL) and extensor digitorum longus muscle (EDL), compared with that in the untreated control mdx mice. It seems that myonecrosis in the mdx mouse is facilitated by muscle movement itself and that immobilization of muscle prevents myonecrosis. This concept is helpful for understanding the mechanism underlying myonecrosis in patients with Duchenne muscular dystrophy, and for instruction concerning rehabilitation programs and activities in daily life.
Insights
Immobilizing muscles in mdx mice reduced muscle fiber degeneration. This finding suggests that limiting muscle movement may prevent myonecrosis in Duchenne muscular dystrophy patients.
Area of Science:
- Biomedical Science
- Muscle Physiology
- Animal Models
Background:
- Muscular dystrophy is characterized by progressive muscle degeneration.
- Duchenne muscular dystrophy (DMD) is a severe form of muscular dystrophy.
- mdx mice are a common model for studying DMD.
Purpose of the Study:
- To investigate the effect of muscle immobilization on myodegeneration in mdx mice.
- To explore the role of muscle movement in the pathogenesis of myonecrosis.
- To provide insights into rehabilitation strategies for DMD patients.
Main Methods:
- mdx mice were injected with tetanus toxin and subjected to sustained dorsiflexion.
- Control groups of mdx mice were untreated.
- Histological analysis was performed to assess centronucleated muscle fibers, indicating myodegeneration.
Main Results:
- Tetanus toxin injection followed by sustained muscle movement significantly reduced centronucleated muscle fibers in soleus (SOL) and extensor digitorum longus (EDL) muscles.
- Immobilization of muscles in mdx mice prevented myonecrosis.
- A significant reduction in myodegeneration was observed in immobilized muscles compared to controls.
Conclusions:
- Muscle movement facilitates myonecrosis in mdx mice.
- Immobilization of muscles can prevent myonecrosis in this model.
- Findings support the importance of considering muscle activity in rehabilitation for Duchenne muscular dystrophy.
