The aim of this study was to investigate the presence of glutamic acid decarboxylase (GAD) autoantibodies in the saliva of children with type 1 diabetes. A total of 30 diabetic children were used in this study while 80 healthy individuals of similar age were used as controls. Total saliva and peripheral blood was collected from all diabetic children and controls. Determination of GAD autoantibodies was performed using an enzyme immunoassay (Varelisa) which is based on a recombinant human GAD65. The results of this study showed that GAD autoantibodies were found to be present in 21 out of 30 diabetic serum samples, while they were present in all samples of diabetic saliva. In contrast, they were absent from serum and saliva of healthy controls. Since GAD is considered one of the basic antigenic targets of the autoimmune process in type 1 diabetes in the pancreatic beta cells, its presence in the saliva may be relevant as a predictive marker.
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