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  • Title: Mechanism of lipid-lowering action of the dipeptidyl peptidase-4 inhibitor, anagliptin, in low-density lipoprotein receptor-deficient mice.
    Author: Yano W, Inoue N, Ito S, Itou T, Yasumura M, Yoshinaka Y, Hagita S, Goto M, Nakagawa T, Inoue K, Tanabe S, Kaku K.
    Journal: J Diabetes Investig; 2017 Mar; 8(2):155-160. PubMed ID: 27860391.
    Abstract:
    AIMS/INTRODUCTION: Dipeptidyl peptidase-4 inhibitors are used for treatment of patients with type 2 diabetes. In addition to glycemic control, these agents showed beneficial effects on lipid metabolism in clinical trials. However, the mechanism underlying the lipid-lowering effect of dipeptidyl peptidase-4 inhibitors remains unclear. Here, we investigated the lipid-lowering efficacy of anagliptin in a hyperlipidemic animal model, and examined the mechanism of action. MATERIALS AND METHODS: Male low-density lipoprotein receptor-deficient mice were administered 0.3% anagliptin in their diet. Plasma lipid levels were assayed and lipoprotein profile was analyzed using high-performance liquid chromatography. Hepatic gene expression was examined by deoxyribonucleic acid microarray and quantitative polymerase chain reaction analyses. Sterol regulatory element-binding protein transactivation assay was carried out in vitro. RESULTS: Anagliptin treatment significantly decreased the plasma total cholesterol (14% reduction, P < 0.01) and triglyceride levels (27% reduction, P < 0.01). Both low-density lipoprotein cholesterol and very low-density lipoprotein cholesterol were also decreased significantly by anagliptin treatment. Sterol regulatory element-binding protein-2 messenger ribonucleic acid expression level was significantly decreased at night in anagliptin-treated mice (15% reduction, P < 0.05). Anagliptin significantly suppressed sterol regulatory element-binding protein activity in HepG2 cells (21% decrease, P < 0.001). CONCLUSIONS: The results presented here showed that the dipeptidyl peptidase-4 inhibitor, anagliptin, exhibited a lipid-lowering effect in a hyperlipidemic animal model, and suggested that the downregulation of hepatic lipid synthesis was involved in the effect. Anagliptin might have beneficial effects on lipid metabolism in addition to a glucose-lowering effect.
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