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It has been reported that postprandial hyperglycemia from the pre-diabetic stage, especially from the impaired glucose tolerance (IGT) stage, is positively associated with subsequent incidences of cardiovascular diseases (CVD) and type 2 diabetes. In this study, we aimed to investigate whether treatment with a dipeptidyl peptidase-4 inhibitor (DPP-4I) or an α-glucosidase inhibitor (α-GI), either of which suppresses postprandial hyperglycemia, reduces the expression of CVD risk factors in an IGT animal model. A DPP-4I, anagliptin (1,200 ppm), or an α-GI, miglitol (600 ppm), in the diet was administered for 47 wk to Otsuka Long-Evans Tokushima Fatty (OLETF) rats, a model for spontaneously-developed type 2 diabetes, at the IGT stage. We examined whether each treatment reduced the expression of CVD risk factors such as inflammatory cytokines/cytokine-like factors in peripheral leukocytes and adhesion molecules in the aortic tissues and circulation. Treatment with either drug reduced IGT development and repressed expression of the interleukin-1β, tumor necrosis factor-α, S100a9, and S100a11 genes in peripheral leukocytes in the fasting state at weeks 25 and 39. The mRNA levels of E-selectin in aortic tissues and protein levels of the soluble forms of E-selectin and ICAM-1 in arterial blood were significantly lower in the anagliptin and miglitol groups than in the control group. Our results suggest that long-term treatment with anagliptin or miglitol in OLETF rats at the IGT stage suppresses the expression of inflammatory cytokines in peripheral leukocytes and adhesion molecules in aortic tissues.

Treatment with DPP-4I Anagliptin or &alpha;-GI Miglitol Reduces IGT Development and the Expression of CVD Risk Factors in OLETF Rats

Treatment with DPP-4I Anagliptin or α-GI Miglitol Reduces IGT Development and the Expression of CVD Risk Factors in OLETF Rats