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DPP-4 Inhibitor Sitagliptin Improves Cardiac Function and Glucose Homeostasis and Ameliorates β-Cell Dysfunction Together with Reducing S6K1 Activation and IRS-1 and IRS-2 Degradation in Obesity Female Mice.

Abstract：

Background:Chronic overnutrition leads to cardiac dysfunction and insulin (INS) resistance. Dipeptidyl peptidase-4 (DPP-4) improves glucose metabolism and insulin sensitivity in both human and animal models. In this study, we explored whether DPP-4 inhibitor sitagliptin (SIT) is involved in the protection of cardiac function and β-cell function using an obesity female mouse model. Methods:Six-week-old C57BL6/J mice were fed a high fat and fructose Western diet with DPP-4 inhibitor SIT for 12 weeks. Cardiac function was examined by echocardiography. Body weight, plasma glucose, and insulin concentrations were measured. The contents of total S6 kinase 1 (S6K1), phosphorylation of S6K1 activation, and INS docking proteins INS receptor substrates 1 and 2 (IRS-1, IRS-2) were assayed, and histology of heart tissue was performed. Results:Chronic Western diet consumption elevated plasma glucose and insulin and caused obesity, diastolic dysfunction, and β-cell dysfunction. DPP-4 inhibition with SIT resulted in reduction in body weight, fasting glucose, and plasma insulin, and improved cardiac diastolic dysfunction. SIT also decreased mTOR/S6K1 activation and prevented the degradation of IRS-1 and IRS-2. Conclusions:This study revealed pleiotropic protective effects of DPP-4 inhibitor SIT on cardiac function, glycemia, and β-cell function together with reducing S6K1 activation and IRS-1 and IRS-2 degradation in the obesity female mouse model.

journal_name

J Diabetes Res

journal_title

Journal of diabetes research

authors

Qiao S,Mao G,Li H,Ma Z,Hong L,Zhang H,Wang C,An J

doi

10.1155/2018/3641516

subject

Has Abstract

pub_date

2018-07-17 00:00:00

pages

3641516

eissn

2314-6745

issn

2314-6753

journal_volume

2018

pub_type

杂志文章

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