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Cholesterol 7α-hydroxylase (CYP7A1) is regulated by bile acids through the farnesoid X receptor (FXR) mechanism in a negative feedback fashion. However, the fact that CYP7A1 is down-regulated by intraduodenal administration of bile acid, but not by intravenous administration may not be explained only by this mechanism. The aim of this study was to establish a new rat model with reconstructed or simulated...
In order to re-evaluate the importance of the enterohepatic circulation of bile acid in the regulation of the activities of hepatic cholesterol 7α-hydroxylase, bile acid metabolism was examined in internal biliary bypass models of rats. A polyethylene tube was inserted into the common bile duct and another side of the tube was placed in the duodenum (DD), lower jejunum (JD), cecum (CeD), or transverse...
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