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The loop diuretic bumetanide which inhibits hepatic bile acid uptake competitively according to its transport kinetics has been proposed to serve as a substrate of a multispecific bile acid transport system in liver parenchymal cells. However, when the in vitro transcripts of two cloned hepatic bile acid uptake carriers, the Ntcp (Na+/taurocholate cotransporting polypeptide) and the oatp (organic anion transporting polypeptide), was expressed for three days in Xenopus laevis oocytes [3H]bumetanide uptake was not increased although bile acid uptake was stimulated. The data presented show that bumetanide is taken up by a third organic anion transport system which is different from the cloned bile acid transporters.


J A Horz, W Honscha, E Petzinger. Bumetanide is not transported by the Ntcp or by the oatp: evidence for a third organic anion transporter in rat liver cells. Biochimica et biophysica acta. 1996 Apr 19;1300(2):114-8

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PMID: 8652636

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