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Morphological and smooth muscle cell phenotypic changes in fetal rabbit aorta during early development
A J Cayatte1, M Ashraf, M T Subbiah
1Department of Internal Medicine and Pathology, University of Cincinnati Medical Center, Ohio.
Basic Research in Cardiology
|May 1, 1989
Summary
Fetal rabbit aortas show high cholesterol and synthetic smooth muscle cells early in development. Despite these atherogenesis risk factors, lipid accumulation was not observed, suggesting complex developmental regulation.
Area of Science:
- Cardiovascular Development
- Atherosclerosis Research
- Fetal Biology
Background:
- Previous studies indicated high aortic cholesterol esterification and smooth muscle cell proliferation susceptibility in fetal rabbits, features linked to atherogenesis.
- These findings suggested a potential predisposition to atherosclerosis during fetal development.
Purpose of the Study:
- To investigate the detailed morphological development of the fetal aorta.
- To correlate aortic development with fetal plasma cholesterol levels.
- To understand the cellular phenotypes of aortic smooth muscle and endothelial cells during fetal development.
Main Methods:
- Analysis of fetal rabbit plasma cholesterol levels at different gestational stages.
- Morphological examination of fetal aorta using transmission electron microscopy.
- Assessment of smooth muscle cell phenotype (synthetic vs. contractile) and endothelial cell morphology.
Main Results:
- Fetal plasma cholesterol levels were high in early gestation, decreasing towards term.
- Early fetal aortic endothelial cells showed luminal protrusion, flattening by birth.
- Smooth muscle cells were predominantly in a synthetic phenotype early on, transitioning to contractile by birth.
- Despite hypercholesterolemia and synthetic smooth muscle cells, no lipid accumulation was detected via electron microscopy.
Conclusions:
- The fetal rabbit aorta undergoes significant morphological and cellular differentiation during development.
- Early fetal hypercholesterolemia and synthetic smooth muscle cells do not lead to detectable lipid accumulation, indicating protective mechanisms.
- These findings provide insights into the complex interplay of cholesterol, cellular phenotype, and vascular development in preventing early atherogenesis.