Protective effect of the intravenous administration of ursodeoxycholic acid against endotoxemia in rats with obstructive jaundice |
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Authors: | Yuichi Hori Harumasa Ohyanagi |
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Institution: | (1) Second Department of Surgery, Kinki University School of Medicine, 377-2 Ohno-Higashi, 589 Osaka-Sayama, Osaka, Japan;(2) First Department of Surgery, Kobe University School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, 650 Kobe, Japan |
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Abstract: | This study was undertaken to elucidate the effect of the intravenous administration of ursodeoxycholic acid (UDCA) on endotoxemia
in rats with obstructive jaundice from the viewpoint of the biliary excretion of lipopolysaccharide (LPS) through hepatocytes.
In rats with obstructive jaundice, fluorescein isothiocyanate-labeled LPS was administered via the portal vein and then its
biliary excretion was examined. A significant increase in the LPS excretion was thus noticed in UDCA-treated rats at a dose
of 0.1μmol/100g body wt. per min. In place of UDCA, sodium taurocholate at the same dose also enhanced the biliary excretion
of LPS. Secondly, we also examined whether or not UDCA protects against endotoxemia. In this experiment, nonlabeled LPS was
administered via the portal vein and its peripheral concentration was then measured. In UDCA-treated rats, the endotoxin concentration
was significantly lower. Finally, to elucidate the effect of UDCA on Kupffer cells, serum tumor necrosis factor (TNF-α) was
measured. But UDCA had no effect on the TNF-α level. These findings thus demonstrate that the intravenous administration of
UDCA protects against endotoxemia by enhancing the transport of LPS across the hepatocytes from blood to bile without affecting
Kupffer cells, and that this biliary excretion of LPS is dependent on bile acids. |
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Keywords: | ursodeoxycholic acid endotoxin obstructive jaundice vesicular transport endotoxemia |
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