Therapeutic evaluation of GM2 gangliosidoses by ELISA using anti-GM2 ganglioside antibodies

Background: GM2 gangliosidoses, including Tay-Sachs disease, Sandhoff disease and the AB variant, comprise deficiencies of beta-hexosaminidase isozymes and GM2 ganglioside activator protein associated with accumulation of GM2 ganglioside (GM2) in lysosomes and neurosomatic clinical manifestations. A simple assay system for intracellular quantification of GM2 is required to evaluate the therapeutic effects on GM2-gangliosidoses. Methods: We newly established a cell-ELISA system involving anti-GM2 monoclonal antibodies for measuring GM2 storage in fibroblasts from Tay-Sachs and Sandhoff disease patients. Results: We succeeded in detecting the corrective effect of enzyme replacement on elimination of GM2 in the cells with this ELISA system. Conclusions: This simple and sensitive system should be useful as additional diagnosis tool as well as therapeutic evaluation of GM2 gangliosidoses. (c) 2006 Published by Elsevier B.V.