Related Experiment Videos
[Apoptosis in pressure overload-induced heart hypertrophy]
1Institute of Biomedical Engineeting, West China University of Medical Sciences, Chengdu 610041.
Summary
Cardiac hypertrophy is initiated by cardiomyocyte apoptosis, with both factors balancing cell growth and death early on. Prolonged constriction leads to heart remodeling, involving both hypertrophy and apoptosis.
Area of Science:
- Cardiovascular Biology
- Cellular Biology
- Pathophysiology
Context:
- Pressure overload is a known cause of cardiac hypertrophy and apoptosis.
- The role of apoptosis in the early stages of cardiomyocyte hypertrophy is not well understood.
Purpose:
- To investigate the process of cardiomyocyte apoptosis during the initial phase of cardiac hypertrophy.
- To elucidate the relationship between cardiomyocyte apoptosis and hypertrophy following pressure overload.
Summary:
- Cardiac hypertrophy was induced in male Sprague-Dawley rats via transverse aortic constriction.
- Apoptosis was assessed using TUNEL assay and flow cytometry (FCM).
- Results showed increased hypertrophy and fluctuating apoptosis ratios, with initial increases followed by decreases and subsequent rises with prolonged constriction.
Impact:
- Findings suggest cardiac hypertrophy is initiated by cardiomyocyte apoptosis.
- These processes maintain a balance between cell growth and death in early pressure overload.
- Both hypertrophy and apoptosis are implicated in the pathogenesis of heart remodeling during sustained aortic constriction.