A case of Type II glycogenosis (Pompe's disease) has been studied by histochemical, electron microscopic, and biochemical techniques. These studies have been made prior to and after the intramuscular administration for 1 week of a mixture of hydrolytic enzymes containing both α-1,4- and α-1,6-glucosidase activities.
Electron photomicrographs of the liver before enzyme administration showed glycogen to be located both within and outside of membrane-limited vacuoles. No change in this distribution could be detected in tissue removed by biopsy after enzyme administration. This impression was confirmed by the determination of glycogen content which was shown to be unchanged. Nevertheless, the liver was found by enzyme assay to contain the administered enzyme. Leucocytes isolated from blood taken 4 hours after the last enzyme injection were also shown to contain the parenterally administered glucosidases.
In skeletal muscle glycogen was present chiefly as extrasaccular deposits which were unchanged in appearance by enzyme administration. No glucosidase activity was demonstrable in the skeletal muscle after such a treatment.
Myocardium sectioned after autopsy had major deposits of glycogen in extrasaccular areas.
Prenatal Diagnosis of Type II Glycogenosis (Pompe's Disease) Using Microchemical Analyses