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- W1974493013 abstract "Gallstones are frequent in patients with cystic fibrosis (CF). These stones are generally “black” pigment (i.e., Ca bilirubinate) with an appreciable cholesterol admixture. The pathophysiology and molecular mechanisms for this “mixed” gallstone in CF are unknown. Here we investigate in a CF mouse model with no overt liver or gallbladder disease whether pathophysiological changes in the physical chemistry of gallbladder bile might predict the occurrence of “mixed” cholelithiasis. Employing a ΔF508 mouse model with documented increased fecal bile acid loss and induced enterohepatic cycling of bilirubin ( Am J Physiol Gastrointest Liver Physiol 294: G1411–G1420, 2008), we assessed gallbladder bile chemistry, morphology, and microscopy in CF and wild-type mice, with focus on the concentrations and compositions of the common biliary lipids, bilirubins, Ca 2+ , and pH. Our results demonstrate that gallbladder bile of CF mice contains significantly higher levels of all bilirubin conjugates and unconjugated bilirubin with lower gallbladder bile pH values. Significant elevations in Ca bilirubinate ion products in bile of CF mice increase the likelihood of supersaturating bile and forming black pigment gallstones. The risk of potential pigment cholelithogenesis is coupled with higher cholesterol saturations and bile salt hydrophobicity indexes, consistent with a proclivity to cholesterol phase separation during pigment gallstone formation. This is an initial step toward unraveling the molecular basis of CF gallstone disease and constitutes a framework for investigating animal models of CF with more severe biliary disease, as well as the human disease." @default.
- W1974493013 created "2016-06-24" @default.
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- W1974493013 date "2010-07-01" @default.
- W1974493013 modified "2023-09-27" @default.
- W1974493013 title "Pathophysiological preconditions promoting mixed “black” pigment plus cholesterol gallstones in a ΔF508 mouse model of cystic fibrosis" @default.
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- W1974493013 doi "https://doi.org/10.1152/ajpgi.00341.2009" @default.
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