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September 1982

Brain Glucocerebrosidase in Gaucher's Disease

Author Affiliations

From the Department of Biochemistry, University of Pittsburgh School of Medicine (Ms Daniels, Mr Coyle, and Dr Glew); Mental Health Research Institute (Department of Psychiatry) and Department of Biological Chemistry, University of Michigan, Ann Arbor (Dr Radin); and National Research Council, Division of Biological Sciences, Ottawa (Dr Labow).

Arch Neurol. 1982;39(9):550-556. doi:10.1001/archneur.1982.00510210020005

• Using glucocerebroside labeled with carbon 14 as the substrate, we determined that homogenates of brain tissue from both neuropathic and nonneuropathic cases of Gaucher's disease were profoundly deficient (more than 85%) in glucocerebrosidase activity. The β-glucosidase activity, as measured with 4-methylumbelliferyl-β-D-glucopyranoside as the substrate, in the homogenates of brain from four cases of Gaucher's disease was less sensitive to inhibition by conduritol B epoxide (CBE) when compared with normal brain β-glucosidase. However, when homogenates were assayed with radiolabeled glucocerebroside as the substrate, no differential sensitivity toward CBE was indicated, suggesting the presence of an additional, CBE-insensitive, β-glucosidase in brain tissue. Residual glucocerebrosidase activity partially purified from the brain of an adult with type 1 Gaucher's disease was activated threefold by gluconoyl hydrazine, whereas the same enzyme from control brain was unaffected, and eight times less sensitive to gluconolactone inhibition.

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