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- W1924571493 abstract "To test the hypothesis of broad specificity of the hepatocellular bile acid uptake system(s) we investigated the kinetics and substrate specificity of Na+-dependent taurocholate uptake in basolateral (sinusoidal) rat liver plasma membrane vesicles in the presence and absence of bovine serum albumin. Bovine serum albumin selectively stimulated the Na+-dependent portion of taurocholate uptake and decreased its apparent Km from 46 +/- 6 to 17 +/- 3 microM, whereas it had no effect on Vmax (4.2 +/- 0.2 nmol.mg-1.min-1). Based on complementary analysis by Dixon- and Cornish-Bowden-plots the following compounds were identified as competitive inhibitors of Na+-dependent taurocholate uptake: cholate (Ki = 140 +/- 30 microM); taurochenodeoxycholate (Ki = 9 +/- 3 microM); chenodeoxycholate (Ki = 53 +/- 6 microM); progesterone (Ki = 110 +/- 30 microM); 17-beta-estradiol-3-sulfate (Ki = 28 +/- 4 microM); bumetanide (Ki = 440 +/- 85 microns); furosemide (Ki = 460 +/- 140 microM); verapamil (Ki = 65 +/- 35 microM); and phalloidin (Ki = 850 +/- 350 microM). In contrast, noncompetitive inhibition was found with bromosulfophthalein (Ki = 12 +/- 2 microM), cyclosporin A (Ki = 3 +/- 1 microM) and 4,4'-diisothiocyano-2,2'-disulfonic acid stilbene (Ki = 45 +/- 7 microM). These results support the concept of multispecificity of the Na+-dependent basolateral bile acid uptake system with respect to different bile acids and drugs. In addition, the findings provide further evidence for bile acids and bromosulfophthalein being taken up into rat hepatocytes by different transport systems, thus supporting the assumption of multiple basolateral organic anion carriers with distinct, yet partially overlapping substrate specificities." @default.
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- W1924571493 date "1989-07-01" @default.
- W1924571493 modified "2023-09-27" @default.
- W1924571493 title "Multispecificity of Na+-dependent taurocholate uptake in basolateral (sinusoidal) rat liver plasma membrane vesicles." @default.
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