In this study, we examined the effects of switching from acarbose or voglibose to miglitol in type 2 diabetes mellitus patients for 3 months on gene expression of inflammatory cytokines/cytokine-like factors in peripheral leukocytes and on glucose fluctuations. We enrolled 47 Japanese patients with type 2 diabetes mellitus, aged 26 to 81 years, with hemoglobin A(₁c) levels ranging from 6.5% to 7.9% and who were treated with the highest approved dose of acarbose (100 mg per meal) or voglibose (0.3 mg per meal) in combination with insulin or sulfonylurea. Their prior α-glucosidase inhibitors were switched to a medium dose of miglitol (50 mg per meal), and the new treatments were maintained for 3 months. Forty-three patients completed the 3-month study and were analyzed. The switch to miglitol for 3 months did not affect hemoglobin A(₁c), fasting glucose, triglycerides, total cholesterol, or C-reactive protein levels, or adverse events other than hypoglycemia symptoms. Hypoglycemia symptoms and glucose fluctuations were significantly improved by the switch. The expression of interleukin-1β, tumor necrosis factor-α, and S100a4/6/9/10/11/12 genes in peripheral leukocytes, and the serum tumor necrosis factor-α protein levels were suppressed by switching to miglitol. Miglitol reduces glucose fluctuations and gene expression of inflammatory cytokines/cytokine-like factors in peripheral leukocytes of type 2 diabetes mellitus patients more than other α-glucosidase inhibitors and with fewer adverse effects.
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