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Myocardial enlargement in defective heart development
T L Creazzo1, J Burch, S Redmond
1Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta 30912-2000.
The Anatomical Record
|June 1, 1994
Summary
Cardiac neural crest ablation in chick embryos causes persistent truncus arteriosus (PTA). Despite structural defects, heart growth is not increased, and embryos show edema and poor development.
Area of Science:
- Developmental biology
- Cardiovascular research
- Embryology
Background:
- Cardiac neural crest cells are crucial for outflow tract septation and aortic arch development.
- Ablation of cardiac neural crest in chick embryos leads to persistent truncus arteriosus (PTA).
- PTA and altered hemodynamics may impact myocardial development.
Purpose of the Study:
- To investigate the impact of cardiac neural crest ablation and resulting PTA on ventricular growth and myocyte characteristics in chick embryos.
- To compare ventricular and embryo weights, myocyte number, and myocyte density in control, sham-operated, and ablated embryos.
Main Methods:
- Chick embryos underwent cardiac neural crest ablation or sham operation.
- Ventricular and whole embryo wet/dry weights were measured at day 11 of incubation.
- Total myocyte number and myocyte density per ventricle were quantified.
Main Results:
- Embryos with PTA weighed less and exhibited edema compared to controls.
- Ventricle-to-embryo weight ratios were higher in PTA embryos, indicating relative ventricular enlargement.
- Total myocyte number and density were similar between PTA and control groups, suggesting no intrinsic myocardial abnormality.
Conclusions:
- Hemodynamic stresses from PTA do not stimulate compensatory heart growth.
- Cardiac function is impaired in PTA embryos, evidenced by edema and failure to thrive.
- Myocardial development is not intrinsically altered by neural crest ablation despite severe cardiac defects.