Administration of ursodeoxycholate failed to prevent sludge and/or gallstone formation in cholecystokinin-1(A) receptor-deficient mice.

Gallstone disease is one of the most prevalent digestive diseases. The frequency of gallstone disease is about 10% in middle-age persons and 20% in aged persons. Gallbladder dysmotility and stasis of bile flow promote sludge and/or gallstone formation. Gallbladder contraction depends on cholecystokinin (CCK) via CCK-1 receptors (R)s. Previously, we raised CCK-1R deficient (-/-) mice and observed sludge and/or gallstone formation in more than 30% at 12-24 months of age. As ursodeoxycholate (UDCA) is commonly used for patients with gallstone disease, we expected that continuous administration of UDCA could prevent sludge and/or gallstone formation in CCK- 1R(-/-) mice. A diet containing 0.1% UDCA was administered in age-matched CCK-1R(-/-) and wild-type male and female mice for 8 months. Administration of UDCA decreased the frequency of sludge and/or gallstone formation compared with the control (CRF-1) diet (39%→26% in male, 35%→25% in female mice); however, these effects did not attain a level of statistical significance. Although the body weight was significantly higher in UDCA-fed than CRF-1-fed male mice regardless of genotypes, the plasma lipid concentrations did not differ between the two diets. In conclusion, administration of UDCA was less effective than expected at preventing sludge and/or gallstone formation in CCK-1R(-/-) mice.