Can muscle lysosomal enzymes affect muscle collagen post-mortem?

Area of Science:

• Biochemistry
• Muscle Physiology
• Collagen Research

Background:

• Collagen is a key structural protein in muscle tissue.
• Lysosomal enzymes play roles in cellular degradation.
• Understanding collagen stability is crucial for muscle function and preservation.

Purpose of the Study:

• To investigate the effect of muscle lysosomal enzymes on collagen thermal stability.
• To quantify the impact of these enzymes on muscle fiber strength.

Main Methods:

• Incubation of collagen fibers with muscle lysosomal enzymes.
• Controlled temperature (37°C) and pH (5.5) conditions.
• Measurement of thermal stability and fiber strength via thermal contraction.

Main Results:

• Muscle lysosomal enzymes significantly affected collagen thermal stability.
• The thermolabile fraction of collagen increased post-treatment.
• Muscle fiber strength decreased by approximately 50% after enzymatic treatment.

Conclusions:

• A muscle lysosomal enzyme system can reduce the strength of muscle collagen.
• Limited enzyme release or presence of inhibitors may prevent this effect post-mortem.