Activation of nuclear β-catenin/c-Myc axis promotes oxidative stress injury in streptozotocin-induced diabetic cardiomyopathy
- Department of Cardiology, Shanghai East Hospital, Tongji University, Shanghai 200120 (China)
- College of Clinical Medicine, Shanxi Medical University, Taiyuan 030001 (China)
- Department of Orthopaedics, Shaanxi Provincial People's Hospital, Xi'an Jiaotong University, Xi'an 710068 (China)
- Department of Internal Medicine, Shanghai Dermatology Hospital, Tongji University, Shanghai 200443 (China)
Myocardial oxidative stress injury plays a crucial role in the pathogenesis of diabetic cardiomyopathy (DCM). Wnt/β-catenin signaling has been reported to involve in various heart diseases. However, the underlying mechanism associated with β-catenin in DCM remains elusive. This study intended to explore the effect of β-catenin on oxidative damage of DCM by establishing streptozotocin (STZ)-induced diabetic mouse model and hydrogen peroxide (H{sub 2}O{sub 2})-treated myocardial cell model. Cardiac oxidative stress in DCM was detected by measurements of lipid peroxidation and anti-oxidative enzyme activities as well as DHE staining. Nuclear β-catenin activity and oxidative damage degree were measured by western blotting, qPCR, MTT assay and TUNEL staining. Cardiac function and morphology were evaluated by echocardiography and histopathology. Under diabetic oxidative stress or H{sub 2}O{sub 2} stimulation, nuclear β-catenin accumulation upregulated downstream c-Myc and further facilitated DNA damage and p53-mediated apoptosis as well as cell viability reduction, followed by phenotypic changes of cardiac dysfunction, interstitial fibrosis deposition and myocardial atrophy. Conversely, through directly inhibiting nuclear β-catenin/c-Myc axis, not only did siRNA knockdown of β-catenin or c-Myc attenuate cell injury in H{sub 2}O{sub 2}-stimulated cardiomyocytes, but also diabetic cardiac-specific β-catenin-knockout mice displayed the same prevention of heart injury as insulin-treated diabetic mice. The present study demonstrated that activated nuclear β-catenin/c-Myc axis was responsible for oxidative cardiac impairment of DCM. Therefore, repressing functional nuclear β-catenin may provide a hopeful therapeutic strategy for DCM. - Highlights: • Nuclear β-catenin/c-Myc axis is activated in H{sub 2}O{sub 2}-treated cardiomyocytes. • Knockdown of β-catenin or c-Myc relieves H{sub 2}O{sub 2}-caused cardiomyocyte injury. • Nuclear β-catenin/c-Myc axis is activated in diabetic cardiomyopathy (DCM). • Cardiac deletion of β-catenin abates oxidative injury of DCM via inhibiting c-Myc.
- OSTI ID:
- 22719150
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 493, Issue 4; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Knockout of CNR1 prevents metabolic stress-induced cardiac injury through improving insulin resistance (IR) injury and endoplasmic reticulum (ER) stress by promoting AMPK-alpha activation
DUSP14 knockout accelerates cardiac ischemia reperfusion (IR) injury through activating NF-κB and MAPKs signaling pathways modulated by ROS generation