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Dynamic patterns of apoptosis in the developing chicken heart
Katherine S Schaefer1, Yong Qiu Doughman, Steven A Fisher
1Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
Summary
Apoptosis, or programmed cell death, is crucial for heart outflow tract development. This study used LysoTracker Red staining in chicken embryos to map cell death, revealing its precise role in forming the aorta and pulmonary artery connections.
Area of Science:
- Developmental Biology
- Cardiovascular Research
- Cell Biology
Background:
- Congenital heart defects often involve abnormalities in the outflow tract (OFT).
- Apoptosis is a key cellular mechanism driving OFT morphogenesis.
Purpose of the Study:
- To investigate the spatial and temporal patterns of apoptosis in the developing chicken OFT.
- To elucidate the role of cardiomyocyte apoptosis in the proper formation and alignment of the aorta and pulmonary artery.
Main Methods:
- Utilized chicken embryos (stages 19-38) for developmental studies.
- Employed LysoTracker Red (LTR), a fluorescent supravital lysosomal dye, for apoptosis detection.
- Performed three-dimensional analysis to correlate structural changes with apoptosis.
Main Results:
- LTR staining peaked in the OFT myocardium between stages 27-32, indicating heightened apoptosis.
- Apoptosis was most prominent in the subaortic myocardium and under cytokeratin-positive epicardium.
- Observed a correlation between epicardial differentiation and cardiomyocyte apoptosis.
Conclusions:
- Temporally and spatially regulated apoptosis in the OFT myocardium is essential for the correct docking of the aorta and pulmonary artery.
- The differentiating epicardium plays a role in influencing cardiomyocyte apoptosis during OFT development.