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Acetylcholinesterase in abnormal human muscle.

Fifty human muscle biopsies were examined for histochemical localization of acetylcholinesterase (AChE) activity. Six normal muscle samples had AChE at the myoneural junctions and around the periphery of many fibers. The AChE within the sarcoplasm itself was found in only a few atrophied fibers. However, 21 of 44 biopsies of abnormal muscles had sarcoplasmic AChE in more than 10% of their fibers. Such cases included Duchenne, limb-girdle and facio-scapulo-humeral dystrophy, neurogenic and spinal muscle atrophy, spinal cord injury, peripheral nerve injury, Schwartz-Jampel syndrome and myasthenic syndrome. Sarcoplasmic AChE is found in embryo muscle and usually declines after birth. It appears after denervation in the chicken but not the rat and remains in muscles of chickens with an inherited muscular dystrophy. The results of the human muscle study support the idea that in the human, as in the chicken, interruption of a neurally-mediated regulation of AChE results in the reappearance of high AChE activity in the sarcoplasm of the muscle fibers.