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Updated: Feb 22, 2026
Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes
Published on: September 24, 2013
AKT2 deficiency induces retardation of myocyte development through EndoG-MEF2A signaling in mouse heart
Dandan Chen1, Fan Chen1, Yitao Xu2
1State Key Laboratory of Natural Medicines, Department of Biochemistry, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210006, China.
Abstract:
Protein kinase B2 (AKT2) is implicated in diverse process of cardiomyocyte signaling including survival and metabolism. However, the role of AKT2 in myocardium development and the signaling pathway is rarely understood. Therefore, we sought to determine the effect of AKT2 deletion on heart development and its downstream targets. By using experimental animal models and neonatal rat cardiomyocytes (NRCMs), we observed that AKT2 deficiency induces retardation of heart development and increased systemic blood pressure (BP) without affecting cardiac function. Further investigation suggested that deficiency of AKT2 in myocardium results in diminished MEF2A abundance, which induced decreased size of cardiomyocytes. We additionally confirmed that EndoG, which is also regulated by AKT2, is a suppressor of MEF2A in myocardium. Finally, our results proved that AKT2 deficiency impairs the response to β-adrenergic stimuli that normally causes hypertrophy in cardiomyocytes by downregulating MEF2A expression. Our data are the first to show the important role of AKT2 in determining the size of myocardium, its deficiency causes retardation of cardiomyocyte development. We also proved a novel pathway of heart development involving EndoG and MEF2A regulated by AKT2.
Insights
Protein kinase B2 (AKT2) deficiency retards heart development by reducing cardiomyocyte size via MEF2A downregulation. This study reveals AKT2
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Developmental Biology
Background:
- Protein kinase B2 (AKT2) is crucial for cardiomyocyte signaling pathways.
- The specific role of AKT2 in heart development and its regulatory mechanisms remain largely unknown.
Purpose of the Study:
- To investigate the impact of AKT2 deletion on heart development and identify its downstream signaling targets.
- To elucidate the novel signaling pathway involving AKT2 in cardiomyocyte growth and response to stimuli.
Main Methods:
- Utilized experimental animal models and neonatal rat cardiomyocytes (NRCMs).
- Analyzed cardiac function, blood pressure, and molecular changes including protein abundance and gene expression.
Main Results:
- AKT2 deficiency led to impaired heart development and increased blood pressure, without affecting cardiac function.
- Myocardial AKT2 deficiency resulted in reduced MEF2A abundance, leading to smaller cardiomyocyte size.
- Endonuclease G (EndoG), regulated by AKT2, was identified as a suppressor of MEF2A in the myocardium.
- AKT2 deficiency impaired cardiomyocyte hypertrophy in response to β-adrenergic stimuli by downregulating MEF2A.
Conclusions:
- AKT2 plays a critical role in determining myocardium size and cardiomyocyte development.
- A novel pathway involving AKT2, EndoG, and MEF2A in heart development is identified.
- AKT2 is essential for normal cardiomyocyte growth and response to hypertrophic stimuli.
