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Gemigliptin ameliorates Western-diet-induced metabolic syndrome in mice

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Dipeptidyl peptidase 4 (DPP-4) inhibitors are widely used antihyperglycemic agents for type 2 diabetes mellitus. Recently, increasing attention has been focused on the pleiotropic actions of DPP-4 inhibitors. The aim of the present study was to examine whether gemigliptin, a recently developed DPP-4 inhibitor, could ameliorate features of metabolic syndrome. Mice were fed a Western diet (WD) for 12 weeks and were subsequently divided into 2 groups: mice fed a WD diet alone or mice fed a WD diet supplemented with gemigliptin for an additional 4 weeks. Gemigliptin treatment attenuated WD-induced body mass gain, hypercholesterolemia, adipocyte hypertrophy, and macrophage infiltration into adipose tissue, which were accompanied by an increased expression of uncoupling protein 1 in subcutaneous fat. These events contributed to improved insulin sensitivity, as assessed by the homeostasis model assessment of insulin resistance and intraperitoneal insulin tolerance test. Furthermore, gemigliptin reduced WD-induced hepatic triglyceride accumulation via inhibition of de novo lipogenesis and activation of fatty acid oxidation, which was accompanied by AMP-dependent protein kinase activation. Gemigliptin ameliorated WD-induced hepatic inflammation and fibrosis through suppression of oxidative stress. These results suggest that DPP-4 inhibitors may represent promising therapeutic agents for metabolic syndrome beyond their current role as antihyperglycemic agents.
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Keywords: AMP-dependent protein kinase; DPP-4 inhibitor; Western diet; adipocyte hypertrophy; adipose inflammation; hypertrophie des adipocytes; inflammation adipeuse; inhibiteur de la DPP-4; metabolic syndrome; nonalcoholic steatohepatitis; oxidative stress; protéine kinase dépendante de l’AMP; régime alimentaire occidental; stress oxydant; stéatose hépatique non alcoolique; syndrome métabolique

Document Type: Research Article

Publication date: January 1, 2017

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