Evaluation the Effect of 50 g Glucose Tolerance Test on Oxidative Stress and Interleukin-8 Parameters in Prediabetic Pregnancy

Background: The aim of this study is to evaluate the effect of 50 g oral glucose tolerance test (OGTT) on oxidative stress and interleukin-8 (IL-8) parameters in prediabetic pregnant women. 
Materials and Methods: Fasting and 1 hour blood samples were collected from 79 pregnant women who were administered 50 gr OGTT. Patients with a 1 hour blood glucose level of 140–200 mg/dl were considered as the prediabetic group. Thereafter, routine biochemical parameters and the levels of superoxide dismutase (SOD), glutathione peroxidase (GPx), malondialdehyde (MDA) and interleukin-8 (IL-8) parameters were measured from the serum samples taken during fasting and at 1 hour. 
Results: The serum GPx and SOD levels of the prediabetic group were remarkably lower than that of the control group (p<0.05). Whereas the serum IL-8 levels of the prediabetic group were significantly higher than that of the control group (p<0.05). When the fasting and 1 hour levels of the parameters were compared during OGTT, SOD levels were significantly decreased (p<0.001) and IL-8 levels were significantly higher (p<0.001). 
Conclusions: In conclusion, it was found that serum GPX and SOD levels decreased, while serum IL-8 levels increased in prediabetic pregnant women; however, when 50 g OGTT was administered to these patients, SOD levels decreased and IL-8 levels increased. These results we obtained suggest that oxidative stress and systemic inflammation that are already present in prediabetic pregnant women may be triggered by 50 g OGTT, posing negative risk factors for pregnant women.