Single Fiber Isolation Assay for the Assessment of Oxidative Myofiber Behavior

Area of Science:

• Biomedical Engineering
• Muscle Physiology
• Cell Biology

Background:

• Skeletal muscle integrity is vital for movement and health.
• Neuromuscular disorders affect muscle groups differently, necessitating specialized isolation techniques.
• Isolating viable single muscle fibers is critical for mechanistic studies in these conditions.

Purpose of the Study:

• To develop a reliable protocol for high-yield isolation of intact single myofibers from the murine soleus (SOL) muscle.
• To optimize dissociation conditions to minimize fiber loss and preserve cell viability.
• To reduce non-fiber cell contamination for cleaner downstream analyses.

Main Methods:

• Optimized collagenase concentration and digestion time for SOL muscle dissociation.
• Minimized residual tissue attachment and non-fiber cell carryover.
• Comparative analysis with Extensor Digitorum Longus (EDL) muscle.

Main Results:

• Routine isolation of approximately 300-500 intact SOL-derived single myofibers.
• High efficiency of immunolabelling on isolated single fibers.
• High-quality satellite cell isolation with minimal fibroblast contamination.

Conclusions:

• The optimized protocol provides a robust method for single myofiber and satellite cell isolation from the SOL muscle.
• This technique is suitable for various single-fiber analyses and cell culture applications.
• A tailored, muscle-specific approach is valuable for evaluating therapies in neuromuscular disease research.