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The dissolution rate of cholesterol in human gallbladder bile was measured by a rotating-disk method using 14C-labeled cholesterol, and was compared with concentrations of the biliary lipids. Computed multiple regression analysis of the results showed that the dissolution rate of cholesterol could be presented as a function of the concentrations of deoxycholic and chenodeoxycholic acid (multiple correlation 0.905; F-value 51.8 (p less than 0.001)). To examine the effect of different kinds of bile acids on cholesterol solubilization, the cholesterol solubility in a gallbladder bile with addition of a conjugated bile acid was determined. Greater solubilization of cholesterol was observed in the bile with addition of sodium deoxycholylglycine and chenodeoxycholylglycine than that with addition of sodium cholylglycine. There was no additional enhancement of the solubility with addition of sodium ursodeoxycholylglycine. These results suggest that the cholelitholytic effect of chenodeoxycholic acid may be greater than that of ursodeoxycholic acid, since the administration of chenodeoxycholic or ursodeoxycholic acid to patients with cholesterol gallstones induced different alterations of biliary bile acid composition.

Bile acid composition affecting cholesterol dissolution rate: A use of multiple regression analysis.