Abstract
Cerebroside-beta-glucosidase (acid beta-glucosidase) activity was determined in the forebrain from three patients with the infantile type of Gaucher disease, six patients with the Norrbottnian type and one patient with a mixed infantile/Norrbottnian type. The forebrain from ten subjects, aged 3 months to 20 years, served as controls. The activity was assayed with the natural substrate, (glucose-6-3H) nervonoylglucosylsphingosine and the artificial fluorogenic 4-methyl-umbelliferyl-beta-glucoside. The average residual activities of beta-glucosidase were 12% in the Norrbottnian type and 5% in the infantile type when determined with natural or artificial substrate. Optimum discrimination of the two types of Gaucher disease was obtained with the natural substrate.
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