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Sustained gallbladder stasis promotes cholesterol gallstone formation in the ground squirrel
Q W Xu1, M Mantle, J G Pauletzki
1Department of Medicine, Faculty of Medicine, University of Calgary, Alberta, Canada.
Hepatology (Baltimore, Md.)
|October 27, 1997
Summary
Gallbladder stasis, induced by a CCK-A receptor antagonist, accelerates cholesterol crystal formation. This study reveals stasis
Area of Science:
- Gastroenterology and Hepatology
- Biliary System Pathophysiology
- Cholesterol Gallstone Formation
Background:
- Gallbladder stasis is common in patients with cholesterol gallstones.
- The role of stasis as a cause or consequence of gallstones remains unclear.
Purpose of the Study:
- To investigate the impact of sustained gallbladder stasis on gallstone formation.
- To determine if gallbladder stasis is a causative factor in cholesterol gallstone disease.
Main Methods:
- Induced gallbladder stasis using a cholecystokinin (CCK)-A receptor antagonist (MK-329) in ground squirrels.
- Administered trace or high-cholesterol diets.
- Measured gallbladder contraction, fasting volume, cholesterol saturation index (CSI), mucin content, and cholesterol crystal nucleation time.
Main Results:
- MK-329 significantly inhibited gallbladder contraction and increased fasting volume.
- High-cholesterol diet increased CSI; MK-329 decreased CSI in both hepatic and gallbladder bile.
- MK-329 significantly increased gallbladder mucin content and accelerated cholesterol crystal formation and nucleation.
Conclusions:
- Sustained gallbladder stasis, despite potentially lowering CSI, accelerates cholesterol crystal formation locally.
- Gallbladder stasis is a significant contributing factor to cholesterol gallstone pathogenesis.
- This animal model demonstrates a direct link between gallbladder stasis and gallstone development.