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http://dx.doi.org/10.4196/kjpp.2016.20.6.613

Insulin-like growth factor-1 improves diabetic cardiomyopathy through antioxidative and anti-inflammatory processes along with modulation of Akt/GSK-3β signaling in rats  

Wang, Cheng Yu (Center of Morphological Experiment, Medical College of Yanbian University)
Li, Xiang Dan (Center of Morphological Experiment, Medical College of Yanbian University)
Hao, Zhi Hong (Center of Morphological Experiment, Medical College of Yanbian University)
Xu, Dongyuan (Center of Morphological Experiment, Medical College of Yanbian University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.20, no.6, 2016 , pp. 613-619 More about this Journal
Abstract
Diabetic cardiomyopathy (DCM), a serious complication of diabetes mellitus, is associated with changes in myocardial structure and function. This study sought to explore the ability of insulin-like growth factor-1 (IGF-1) to modulate DCM and its related mechanisms. Twenty-four male Wistar rats were injected with streptozotocin (STZ, 60 mg/kg) to mimic diabetes mellitus. Myocardial fibrosis and apoptosis were evaluated by histopathologic analyses, and relevant proteins were analyzed by Western blotting. Inflammatory factors were assessed by ELISA. Markers of oxidative stress were tested by colorimetric analysis. Rats with DCM displayed decreased body weight, metabolic abnormalities, elevated apoptosis (as assessed by the bcl-2/bax ratio and TUNEL assays), increased fibrosis, increased markers of oxidative stress (MDA and SOD) and inflammatory factors (TNF-${\alpha}$ and IL-$1{\beta}$), and decreased phosphorylation of Akt and glycogen synthase kinase (GSK-$3{\beta}$). IGF-1 treatment, however, attenuated the metabolic abnormalities and myocardial apoptosis, interstitial fibrosis, oxidative stress and inflammation seen in diabetic rats, while also increasing the phosphorylation levels of Akt and GSK-$3{\beta}$. These findings suggest that IGF-1 ameliorates the pathophysiological progress of DCM along with an activation of the Akt/GSK-$3{\beta}$ signaling pathway. Our findings suggest that IGF-1 could be a potential therapeutic choice for controlling DCM.
Keywords
Akt; Diabetic cardiomyopathy; GSK-$3{\beta}$; Insulin-like growth factor-1;
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