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Expression of the hepatocellular chloride-dependent sulfobromophthalein uptake system in Xenopus laevis oocytes

Jacquemin, E. and Hagenbuch, B. and Stieger, B. and Wolkoff, A. W. and Meier, P. J.. (1991) Expression of the hepatocellular chloride-dependent sulfobromophthalein uptake system in Xenopus laevis oocytes. Journal of Clinical Investigation, Vol. 88, H. 6. S. 2146-2149.

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Official URL: http://edoc.unibas.ch/dok/A5261770

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Abstract

The expression of the basolateral chloride-activated organic anion uptake system of rat hepatocytes has been studied in Xenopus laevis oocytes. Injection of oocytes with rat liver poly(A)+RNA resulted in the functional expression of chloride-dependent sulfobromophthalein (BSP) uptake within 3-5 d. This expressed chloride-dependent BSP uptake system exhibited saturation kinetics (apparent Km approximately 6.2 microM) and efficiently extracted BSP from its binding sites on BSA. Furthermore, the chloride-activated portion of BSP uptake was inhibited by bilirubin (10 microM; inhibition 53%), 4,4'-diisothiocyano-2,2-disulfonic acid stilbene (DIDS, 100 microM; 80%), taurocholate (100 microM; 80%), and cholate (200 microM; 95%). In contrast to results with total rat liver mRNA, injection of mRNA derived from the Na+/bile acid cotransporter cDNA (Hagenbuch, B., B. Stieger, M. Foguet, H. Lübbert, and P. J. Meier. 1991. Proc. Natl. Acad. Sci. USA. In press.) had no effect on BSP uptake into oocytes. Size fractionation of total rat liver mRNA revealed that a 2.0- to 3.5-kb size-class mRNA was sufficient to express the hepatic chloride-dependent BSP uptake system. These data indicate that "expression cloning" in oocytes represents a promising approach to ultimately clone the cDNA coding for the hepatocyte high affinity, chloride-dependent organic anion uptake system. Furthermore, the results confirm that the Na+/bile acid cotransport system does not mediate BSP uptake.
Faculties and Departments:11 Rektorat und Verwaltung > Vizerektorat Forschung
UniBasel Contributors:Meier-Abt, Peter J.
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:American Society for Clinical Investigation
ISSN:0021-9738
e-ISSN:1558-8238
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Oct 2017 08:19
Deposited On:22 Mar 2012 13:40

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