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Diabetes mellitus is associated with hyperglycemia and with accelerated non-enzymatic glycation, increased oxidative stress and free radical production. The aim of the present study was to evaluate the levels of proteins glycation and oxidation parameters, compare them between poorly and well controlled children with type 1 diabetes mellitus, and determine the impact of glycemic control on these parameters. Blood and serum were obtained from 81 patients with type 1 diabetes mellitus (DM1) (20 patients had long-term good glycemic control [GGC], 61 patients had long-term poor glycemic control [PGC]). Thirty-one healthy children were used as controls. Fructosamine (FAM) was determined by a spectrophotometric method, HbA1c was measured by LPLC, serum advanced glycation end-products (s-AGEs) were determined fluorimetrically, and advanced oxidation protein products (AOPP) were measured spectrophotometrically. We observed significantly higher FAM, HbA1c, s-AGEs and AOPP levels in the patients with DM1 compared with controls, and significantly higher FAM, HbA1c and sAGEs levels in the PGC group compared with the GGC group. AOPP was higher in the PGC group than in the GGC group, but not significantly. In the PGC group we observed significant correlations between HbA1c and HDL-C (r = -0.306, p = 0.01), HbA1c and s-AGEs (r = 0.486, p &lt; 0.001), and HbA1c and AOPP (r = 0.447, p &lt; 0.01). s-AGEs significantly correlated with triacylglycerols (TAG) (r = 0.537, p &lt; 0.001) and AOPP with HDL-C (r = -0.336, p &lt; 0.05), TAG (r = 0.739, p &lt; 0.001) and s-AGEs (r = 0.577, p &lt; 0.001). In conclusion, our results showed both glycative and oxidative stress are increased in the PGC diabetic group compared with controls, they are linked with glycemic control, and probably contribute to the development of diabetic complications. We suggest that the measurement of not only HbA1c but also s-AGEs and AOPP may be useful to predict the risk of development of diabetic complications.

journal of pediatric endocrinology and metabolism

HbA1c and Serum Levels of Advanced Glycation and Oxidation Protein Products in Poorly and Well Controlled Children and Adolescents with Type 1 Diabetes Mellitus