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Biliary micellar cholesterol nucleates via the vesicular pathway.
1Department of Gastroenterology, Tel-Aviv Medical Center, Ichilov Hospital, Israel.
Biochimica Et Biophysica Acta
|June 28, 1989
Summary
Biliary cholesterol nucleation primarily involves phospholipid vesicles. This study shows micellar cholesterol forms new vesicles, suggesting they are the final pathway for cholesterol nucleation in bile.
Area of Science:
- Bile acid and lipid metabolism
- Gastroenterology and Hepatology
Background:
- Biliary cholesterol crystallization is a key event in gallstone formation.
- Cholesterol nucleation in bile is thought to originate from phospholipid vesicles.
Purpose of the Study:
- To investigate the nucleation mechanism of micellar cholesterol in bile.
- To determine if micellar cholesterol can form new vesicles.
Main Methods:
- Separation of vesicular and micellar bile fractions using gel chromatography.
- Incubation of whole bile and isolated fractions to observe cholesterol nucleation.
- Analysis of newly formed vesicles for chromatographic and chemical similarity.
Main Results:
- In whole bile, cholesterol proportion in vesicles increased significantly during incubation.
- Isolated micelles, initially vesicle-free, formed new vesicles containing cholesterol.
- Newly formed vesicles were similar to pre-existing vesicles.
Conclusions:
- Micellar cholesterol nucleation occurs through the formation of new phospholipid vesicles.
- These newly formed vesicles represent a common pathway for cholesterol nucleation in bile.
- Understanding this pathway may offer insights into gallstone prevention.