Oxidative stress and interleukin-6 secretion during the progression of type 1 diabetes Estresse oxidativo e secreção de interleucina-6 durante a progressão do diabetes tipo 1

Objective: To evaluate inflammatory, oxidizing, and reducing responses during the progression of type 1 diabetes mellitus (T1DM) in patients without chronic complications. Subjects and methods: Plasma antioxidant status, reactive oxygen species (ROS), and interleukin-6 (IL-6) were measured in 42 patients with T1DM and in 24 healthy subjects. Results: Significant incre ases were detected in the median values of ROS and IL-6 in patients with T1DM compared with healthy subjects (ROS ~ 4,836 vs. 2,036 RLU/min, respectively; P 0.05) were observed in oxidizing responses or in IL-6 concentrations when diabetic patients were grouped according to time after diagnosis (0 - 10, 10 - 20 and > 20 years). Plasma antioxidant responses were similar in patients with T1DM and in healthy subjects. Conclusions: Our results demonstrate that oxidizing and inflammatory responses are increased at the onset of T1DM, but remain un changed during disease progression. These findings suggest that functional changes involved in diabetic complications may commence in the first years after diagnosis. Arq Bras Endocrinol Metab.