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- W2055776950 abstract "We have cloned a cDNA coding for a novel member of organic anion transporter, designated OAT-K1, expressed specifically in the kidney of rats. The rat OAT-K1 cDNA (2788 base pairs) had an open reading frame encoding for a 669-amino acid protein (calculated molecular mass of 74 kDa) which shows 72% identity with the cloned rat liver organic anion transporter, oatp. Northern hybridization and reverse transcription-coupled polymerase chain reaction revealed that the rat OAT-K1 messenger RNA transcript is expressed predominantly in the kidney. By use of stable LLC-PK1 cell monolayers transfected with the rat OAT-K1 cDNA, the transporter was suggested to mediate basolateral uptake of methotrexate, an anionic anticancer drug, but not taurocholate, p-aminohippurate, prostaglandin E2, and leukotriene C4. The methotrexate transport by rat OAT-K1 was unaffected by the presence of Na+ or Cl− gradient. The methotrexate accumulation by the OAT-K1-expressing cells showed saturability with the apparent Km value of 1.0 µM. Folate, sulfobromophthalein, and 4,4′-diisothiocyanostilbene-2,2′-disulfonic acid (DIDS) inhibited the methotrexate accumulation markedly. These findings suggest that the rat OAT-K1 is localized in the basolateral membranes of renal tubules, where it mediates renal clearance of methotrexate from the blood." @default.
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- W2055776950 date "1996-08-01" @default.
- W2055776950 modified "2023-10-13" @default.
- W2055776950 title "Cloning and Functional Characterization of a Novel Rat Organic Anion Transporter Mediating Basolateral Uptake of Methotrexate in the Kidney" @default.
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- W2055776950 doi "https://doi.org/10.1074/jbc.271.34.20719" @default.
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