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Studies on cholesterol esterification in human tissues
Research Communications in Chemical Pathology and Pharmacology
|May 1, 1978
Summary
Cholesteryl ester synthesis in human aorta and liver was studied. Aortic cholesteryl esterifying activity did not correlate with atherosclerosis severity, and human liver showed low activity compared to rat liver.
Area of Science:
- Biochemistry
- Cardiovascular Science
- Atherosclerosis Research
Background:
- Cholesteryl ester synthesis is crucial for cellular lipid metabolism.
- Understanding this process in human aorta and liver is vital for atherosclerosis research.
Purpose of the Study:
- To investigate in vitro cholesteryl ester synthesis in human thoracic aorta and liver.
- To determine the relationship between aortic cholesteryl esterifying activity and atherosclerosis severity.
- To characterize the esterifying enzyme system involved.
Main Methods:
- Enzyme preparations from human thoracic aorta and liver were used for in vitro synthesis studies.
- Oleic acid [1-14C] was employed as a substrate.
- Thin-layer chromatography was utilized for product isolation and analysis.
Main Results:
- Evidence suggests the mechanism involves fatty acyl-CoA-cholesterol acyl transferase.
- No clear correlation was found between aortic cholesteryl esterifying activity and the severity of atheroma.
- Normal aorta exhibited low esterifying activity, while human liver samples showed negligible activity compared to rat liver.
Conclusions:
- Aortic cholesteryl esterifying activity is not directly linked to atherosclerosis progression.
- Human liver possesses significantly lower cholesteryl esterifying capacity than rat liver.
- A refined chromatographic method improved the separation of cholesteryl oleate.