Muscle transketolase in normal foetuses and Duchenne dystrophy

Area of Science:

• Biochemistry
• Enzymology
• Muscle Physiology

Background:

• Transketolase (EC 2.2.1.1), a key pentose phosphate pathway enzyme, plays a role in cellular metabolism.
• Altered enzyme activity is implicated in various pathologies, including neuromuscular disorders.

Purpose of the Study:

• To investigate transketolase (pentose phosphate metabolizing enzyme - PPME) activity in quadriceps muscles from patients with Duchenne muscular dystrophy (DMD), polymyositis, and spinal muscular atrophy (SMA).
• To compare enzyme activity in diseased muscle with that of normal fetal muscle.

Main Methods:

• Enzyme activity assays were performed on muscle tissue samples.
• Comparative analysis was conducted between patient groups and normal fetal controls.

Main Results:

• Transketolase activity was significantly elevated in all investigated muscle disorders compared to normal controls.
• The highest enzyme activity was observed in Duchenne muscular dystrophy (DMD) patients, while spinal muscular atrophy (SMA) patients showed the lowest elevated levels.
• In DMD, enzyme activity was elevated early and increased with disease progression.
• Normal fetal muscle exhibited high transketolase activity, comparable to that found in DMD patients.

Conclusions:

• Transketolase activity is significantly altered in Duchenne muscular dystrophy, polymyositis, and spinal muscular atrophy.
• The observed increase in transketolase activity, particularly in DMD, suggests a potential role in disease pathogenesis or as a biomarker.
• Further research is warranted to elucidate the functional significance of elevated transketolase in these neuromuscular conditions.