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The Sister of P-glycoprotein Represents the Canalicular Bile Salt Export Pump of Mammalian Liver
Open accessAbstract
Canalicular secretion of bile salts is a vital function of the vertebrate liver, yet the molecular identity of the involved ATP-dependent carrier protein has not been elucidated. We cloned the full-length cDNA of the sister of P-glycoprotein (spgp; Mr approximately 160,000) of rat liver and demonstrated that it functions as an ATP-dependent bile salt transporter in cRNA injected Xenopus laevis oocytes and in vesicles isolated from transfected Sf9 cells. The latter demonstrated a 5-fold stimulation of ATP-dependent taurocholate transport as compared with controls. This spgp-mediated taurocholate transport was stimulated solely by ATP, was inhibited by vanadate, and exhibited saturability with increasing concentrations of taurocholate (Km approximately 5 microM). Furthermore, spgp-mediated transport rates of various bile salts followed the same order of magnitude as ATP-dependent transport in canalicular rat liver plasma membrane vesicles, i.e. taurochenodeoxycholate > tauroursodeoxycholate = taurocholate > glycocholate = cholate. Tissue distribution assessed by Northern blotting revealed predominant, if not exclusive, expression of spgp in the liver, where it was further localized to the canalicular microvilli and to subcanalicular vesicles of the hepatocytes by in situ immunofluorescence and immunogold labeling studies. These results indicate that the sister of P-glycoprotein is the major canalicular bile salt export pump of mammalian liver.
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Metadata
- Authors
- Gerloff, T., Stieger, B., Hagenbuch, B., Madon, J., Landmann, L., Roth, J., Hofmann, A. F., & Meier, P. J.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1998-04
- Volume
- 273
- Issue
- 16
- Pages
- 10046-10050
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2061569374
- Cited by
- 939
- References
- 1
- FWCI
- 26.30
- Type
- journal article
- Language
- en
- Open access
- hybrid
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