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Investigative Ophthalmology & Visual Science, Vol 34, 2049-2054, Copyright © 1993 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Activity loss of glutathione synthesis enzymes associated with human subcapsular cataract

WB Rathbun, AJ Schmidt and AM Holleschau
Ophthalmology Department, University of Minnesota, Minneapolis 55455.

PURPOSE. To assess the activities of the two enzymes required for glutathione synthesis, gamma-glutamylcysteine synthetase and glutathione synthetase, in various forms of human cataracts. METHODS. The Cooperative Cataract Research Group cataract classification method and standard enzyme assay procedures were used. RESULTS. An inverse relationship was shown between residual activity of each of the glutathione synthesis enzymes and degree of subcapsular cataract. A weaker inverse relationship existed between glutathione synthetase activity and supranuclear and nuclear cataracts. No other parameters yielded comparable correlations with the activity of either enzyme. CONCLUSIONS. Activity loss of the glutathione synthesis enzymes is associated with human subcapsular cataract formation.


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