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American Journal of Clinical Nutrition, Vol. 75, No. 4, 728-733, April 2002
© 2002 American Society for Clinical Nutrition

Original Research Communication

Effects of {alpha}-tocopherol supplementation and continuous subcutaneous insulin infusion on oxidative stress in Korean patients with type 2 diabetes1,2,3

Sunmin Park and Soo Bong Choi

1 From the Department of Food and Nutrition, Hoseo University, Asan-Si, Korea (SP), and the Department of Internal Medicine, KonKuk University, Chungjoo-Si, Korea (SBC).

Background: Most Koreans with type 2 diabetes are insulin deficient and insulin resistant. Continuous subcutaneous insulin infusion (CSII) provides a suitable amount of insulin to overcome insulin deficiency and achieve near-normal blood glucose concentrations. Our previous study showed, however, that CSII does not reduce oxidative stress even though it normalizes blood glucose concentrations.

Objective: The purpose of this study was to determine whether CSII plus {alpha}-tocopherol supplementation for 2 mo would alter oxidative stress in Korean patients with type 2 diabetes.

Design: Ninety-eight subjects received CSII plus either 200 mg {alpha}-tocopherol/d (n = 48) or a placebo (n = 50) for 2 mo. The general characteristics (age, duration of diabetes, body mass index, and blood glucose concentrations) of the 2 groups were not significantly different.

Results: Fasting and postprandial blood glucose concentrations of all subjects were normalized after CSII. Fasting plasma insulin concentrations did not differ significantly between the 2 groups after CSII. Lipid peroxide concentrations in plasma and red blood cells decreased and {alpha}-tocopherol concentrations in plasma and red blood cells increased after {alpha}-tocopherol supplementation. However, these changes were not affected significantly by CSII. Plasma vitamin C concentrations increased significantly after CSII plus {alpha}-tocopherol supplementation. However, the activities of antioxidant enzymes in red blood cells did not change significantly after CSII plus {alpha}-tocopherol supplementation.

Conclusion: {alpha}-Tocopherol supplementation was beneficial in decreasing blood lipid peroxide concentrations without altering antioxidant enzyme activities in Korean patients with type 2 diabetes treated with CSII.

Key Words: Vitamin C • {alpha}-tocopherol • lipid peroxide • glutathione peroxidase • superoxide dismutase • catalase • type 2 diabetes • glucose concentrations • insulin • Korea






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