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- W2025936105 abstract "The organic cation transporter OCTN1 (SLC22A4) is expressed ubiquitously, with strong expression in kidney, trachea, bone marrow, and fetal liver, and it mediates transport of organic cations in a pH‐dependent manner. Recent studies have identified single nucleotide polymorphisms (SNPs) of OCTN1 in the Japanese population. Two SNPs present in the exon regions, c1063t and g1531a, cause amino acid mutation, Thr306Ile (T306I) and Gly462Glu (G462E), respectively. We examined the influence of these SNPs on the intracellular localization, protein expression, and transport activity of OCTN1. Immunocytochemical analysis showed similar localizations of OCTN1 in cellular membranes of HEK293 cells transiently transfected with an expression plasmid DNA for OCTN1 or its SNP allelic variants. The Km and Vmax values for tetraethylammonium (TEA) uptake by T306I were similar to those of the wild‐type even when the Vmax value was normalized for the expression level of OCTN1 protein. In contrast, G462E had almost negligible transport activity, although the protein expression level of G462E was equivalent to that of the wild‐type. We conclude that the SNP that causes the single amino acid mutation T306I does not affect TEA transport activity, whereas the mutation G462E abrogates the TEA transport activity, presumably affecting the physiological function of OCTN1 and/or the pharmacological characteristics of its substrates. © 2004 Wiley‐Liss, Inc. and the American Pharmacists Association J Pharm Sci 93:2920–2926, 2004" @default.
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- W2025936105 date "2004-12-01" @default.
- W2025936105 modified "2023-10-16" @default.
- W2025936105 title "Functional characterization of human organic cation transporter OCTN1 single nucleotide polymorphisms in the Japanese population" @default.
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- W2025936105 doi "https://doi.org/10.1002/jps.20190" @default.
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