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  • Title: The change in the pH 4 and pH 6 forms of alpha-glucosidase in cultured amniotic fluid cells and its implication in prenatal diagnosis of Pompe's disease.
    Author: Fujimoto A, Fluharty AL.
    Journal: Clin Chim Acta; 1978 Dec 01; 90(2):157-61. PubMed ID: 31251.
    Abstract:
    Activities of two major forms of alpha-glucosidase in cultured amniotic fluid cells have been measured by the 4-methylumbelliferyl-alpha-D-glucoside assay after 3, 6 and 9 weeks of culturing. Activity of the pH 4 forms of alpha-glucosidase, which is deficient in Pompe's disease, was low in early culture but increased rapidly as the culture time was increased. The cells harvested at 3 weeks had a low absolute activity of the pH 4 form as well as low ratio of the pH 4 to pH 6 enzyme. The pH 6 form is not affected in Pompe's disease. The results suggest cautions when attempting early diagnosis by use of microtechniques and re-emphasizes the need for differentiation of these two forms of alpha-glucosidases in prenatal diagnosis of Pompe's disease.
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