A 3 months mild functional test regime does not affect disease parameters in young mdx mice

Area of Science:

• Biomedical Science
• Animal Models
• Neuromuscular Disorders

Background:

• Muscular dystrophy research relies on accurate functional assessments in animal models.
• The mdx mouse is a common model for Duchenne muscular dystrophy.
• Evaluating therapeutic agents requires tests that do not interfere with disease progression.

Purpose of the Study:

• To determine if a 12-week functional testing regime affects the natural disease progression in mdx mice.
• To assess the suitability of grip strength, rotarod, and hanging wire tests for evaluating therapeutic interventions.

Main Methods:

• A 12-week testing regime involving grip strength, rotarod, and hanging wire tests was applied weekly to 4-week-old mdx mice.
• Serum creatine kinase levels were measured.
• Skeletal muscle, heart, and diaphragm fibrosis/necrosis were assessed using semi-automated color deconvolution.
• Gene expression of disease-related genes was analyzed.

Main Results:

• No significant differences were observed in serum creatine kinase levels between active and sedentary mice.
• The percentage of fibrotic/necrotic areas in muscles and heart remained consistent across groups.
• Gene expression levels of disease-related genes were not affected by the testing regime.

Conclusions:

• The implemented functional testing regime does not appear to alter the disease progression in mdx mice.
• This test regime is potentially suitable for short-term functional evaluation of therapeutic approaches in mdx mouse models of muscular dystrophy.