Research in Experimental Medicine

, Volume 176, Issue 2, pp 157–172 | Cite as

Tupaias (tree shrews)—A new animal model for gallstone research

II. Influence of Fat, Sugar, and Cholesterol on Bile Composition
  • Anita Schwaier
  • Hans J. Weis
  • Jan van der Linden
Original Works / Originalarbeiten

Summary

The lipid composition of bile obtained from the gallbladder and from the liver of tupaias was determined. Compared to the gallbladder bile of man, the gallbladder bile of tupaias contains the same percentage of phospholipids (PL), one third of the cholesterol (CH), and 50% more total bile acids (TBA). The lithogenic index (LI) of the bile is about 0.2–0.3. No significant sex differences or diurnal variations are found in the composition of bile. The concentration of PL, CH, and TBA is found 5 to 8 times higher in the gallbladder bile than in the liver bile. The bile acid spectrum in tupaias equals that in man qualitatively and is similar quantitatively.

In a feeding experiment, the influences of butter, cholesterol, butter plus cholesterol and sucrose on bile composition, clinicochemical serum values, and liver and gallbladder histology were studied. Groups of six animals each were fed the different diets over a 10-week period. In group A: 20% butter added to the standard diet, PL content was higher, the LI was unchanged. In group B: 2% cholesterol added to the standard diet, the CH value and the LI were elevated, CH crystals but no stones were found. In group C: 2% cholesterol and 20% butter in the standard diet, stone formation was observed. PL and CH values were higher than in group A and B, TBA values were lower. In group D: 50% sucrose added to the standard diet, very low PL and TBA values were determined in the liver bile, resulting in elevated LIs.

It is concluded that all three components of a diet, which had proven lithogenic in a preceding experiment (Schwaier, 1979a), contribute to gallstone formation.

Key words

Tupaia Gallstones Bile composition Diet Lithogenic index 

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Anita Schwaier
    • 1
  • Hans J. Weis
    • 2
  • Jan van der Linden
    • 2
  1. 1.Battelle-Institut e.V.Frankfurt a. M. 90Federal Republic of Germany
  2. 2.II. Medizinische KlinikUniversität MainzMainzFederal Republic of Germany

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