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- W2009463430 abstract "Hypertension induces cardiac dysfunction, calcium (Ca(2+)) dysregulation, and arrhythmogenesis. Dipeptidyl peptidase (DPP)-4 inhibitors, an antidiabetic agent with anti-inflammation and anti-hypertension potential, may regulate peroxisome proliferator-activated receptors (PPARs)-α, -γ, and -δ and Ca(2+) homeostasis.The purpose of this study was to investigate whether DPP-4 inhibitor, sitagliptin, can modulate PPARs and Ca(2+) handling proteins in hypertensive hearts.A Western blot analysis was used to evaluate protein expressions of myocardial PPAR isoforms, tumor necrosis factor (TNF)-α, interleukin (IL)-6, sarcoplasmic reticulum ATPase (SERCA2a), Na(+)-Ca(2+) exchanger (NCX), ryanodine receptor (RyR), voltage-dependent Ca(2+) (CaV1.2), slow-voltage potassium currents (Kvs), angiotensin II type 1 receptor (AT1R), and receptor of advanced glycated end-products (RAGE) from Wistar-Kyoto (WKY) rats, spontaneously hypertensive rats (SHR), and SHR treated with sitagliptin (10mg/kg for 4weeks). Conventional microelectrodes were used to record action potentials (APs) in the ventricular myocytes from each group.Compared to the control group, SHR had lower cardiac PPAR-α and PPAR-δ protein expressions, but had greater cardiac PPAR-γ levels, and TNF-α, IL-6, RAGE, and AT1R protein expressions, which were ameliorated in the sitagliptin-treated SHR. SHR had prolonged QT interval and AP duration with less SERCA2a and RyR, and greater CaV1.2 expressions, which were also attenuated in sitagliptin-treated SHR.Sitagliptin significantly changed the cardiac electrophysiological characteristics and Ca(2+) regulation, which may have been caused by its effects on cardiac PPARs, proinflammatory cytokines, and AT1R." @default.
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- W2009463430 date "2013-10-01" @default.
- W2009463430 modified "2023-10-10" @default.
- W2009463430 title "The dipeptidyl peptidase-4 inhibitor-sitagliptin modulates calcium dysregulation, inflammation, and PPARs in hypertensive cardiomyocytes" @default.
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- W2009463430 doi "https://doi.org/10.1016/j.ijcard.2013.08.051" @default.
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