J. Lipid Res.
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Journal of Lipid Research, Vol 37, 1181-1188, Copyright © 1996 by Lipid Research, Inc.

ARTICLES

Effect of some sulfonate analogues of ursodeoxycholic acid on biliary lipid secretion in the rat

T Mikami, K Kihira, S Ikawa, M Yoshii, EH Mosbach and T Hoshita
Institute of Pharmaceutical Sciences, Hiroshima University School of Medicine, Japan.

The effect of the sulfonate analogues of ursodeoxycholic acid, namely sodium 3 alpha,7 beta-dihydroxy-24-nor-5 beta-cholane-23-sulfonate (norUDC-SO3Na) and sodium 3 alpha, 7 beta-dihydroxy-5 beta-cholane-24- sulfonate (UDC-SO3Na), on biliary lipid secretion was studied in bile fistula rats. During intravenous infusion of the two sulfonate analogues, bile flow and biliary lipid secretion were stimulated in a dose-dependent manner. This suggests that the analogues exert an effect on biliary lipid secretion comparable to that of the naturally occurring bile acid, ursodeoxycholyltaurine (UDC-tau). The effects of norUDC-SO3Na and UDC-SO3Na on bile flow were similar but slightly smaller than that of UDC-tau. The output of bile salts was similar with both sulfonates but greater than that with UDC-tau. The infusion of norUDC-SO3Na or UDC-SO3Na induced cholesterol secretion and phospholipid secretion more significantly than UDC-tau infusion. The increase in phospholipid secretion was particularly pronounced during high-dose administration of norUDC-SO3Na. Although norUDC-SO3Na stimulated cholesterol secretion more intensely than the other two bile salts, it also facilitated phospholipid output, perhaps as a compensatory mechanism, and the biliary cholesterol/phospholipid ratio was decreased to a greater extent by the sulfonates than by UDC-tau. Consequently, the administration of norUDC-SO3Na or UDC-SO3Na produces a more "stable" bile than UDC-tau, suggesting that these sulfonates possess potential cholelitholytic activity.
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