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- W2079307415 abstract "Multispecific organic anion-transporting polypeptides (Oatps) are involved in the transcellular movement of amphipathic compounds in many tissues including the liver, kidney, and blood-brain barrier. Recently, a high-affinity digoxin transporter (Oatp2) was cloned from rat brain and shown to be also expressed in the liver.We investigated the cellular and subcellular distribution of Oatp2 in rat liver by in situ hybridization technology and immunofluorescence microscopy and compared its substrate specificity with that of Oatp1 in complementary RNA-injected Xenopus laevis oocytes.The results show a selective basolateral (sinusoidal) expression of Oatp2 in midzonal to perivenous hepatocytes, but not in periportal or the innermost layer of perivenous hepatocytes. Common substrates of both Oatp1 and Oatp2 include bile salts, steroid conjugates, thyroid hormones (T3, T4), ouabain, and the endothelin receptor antagonist BQ-123 (Michaelis constants: Oatp1, approximately 600 micromol/L; Oatp2, approximately 30 micromol/L). Other organic anions including sulfolithotaurocholate, bilirubin monoglucuronide, and sulfobromophthalein were transported only by Oatp1.These results provide definite evidence for the partially overlapping and partially selective substrate specificities of Oatp1 and Oatp2. The unique acinar distribution of Oatp2 might indicate that it represents a high-affinity backup system for complete hepatocellular removal of certain cholephilic substances from portal blood plasma." @default.
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- W2079307415 date "1999-09-01" @default.
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- W2079307415 title "Localization and function of the organic anion–transporting polypeptide Oatp2 in rat liver" @default.
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- W2079307415 doi "https://doi.org/10.1016/s0016-5085(99)70463-4" @default.
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