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J Biol Chem, Vol. 275, Issue 6, 4507-4512, February 11, 2000
From the A cDNA encoding a novel multispecific organic
anion transporter, OAT4, was isolated from a human kidney cDNA
library. The OAT4 cDNA consisted of 2210 base pairs that encoded a
550-amino acid residue protein with 12 putative membrane-spanning
domains. The amino acid sequence of OAT4 showed 38 to 44% identity to
those of other members of the OAT family. Northern blot analysis
revealed that OAT4 mRNA is abundantly expressed in the placenta as
well as in the kidney. When expressed in Xenopus oocytes,
OAT4 mediated the high affinity transport of estrone sulfate
(Km = 1.01 µM) and
dehydroepiandrosterone sulfate (Km = 0.63 µM) in a sodium-independent manner. OAT4 also mediated
the transport of ochratoxin A. OAT4-mediated transport of estrone
sulfate was inhibited by several sulfate conjugates, such as
p-nitrophenyl sulfate, The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AB026198.
Molecular Cloning and Characterization of Multispecific
Organic Anion Transporter 4 Expressed in the Placenta*
,
,
§,
,
,
,
, and
¶
Department of Pharmacology and Toxicology,
Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka,
Tokyo, 181-8611 and § Department of Biopharmaceutics,
Graduate School of Pharmaceutical Sciences, University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
-naphthyl sulfate,
-estradiol
sulfate, and 4-methylumbelliferyl sulfate. By contrast, glucuronide
conjugates showed little or no inhibitory effect on the OAT4-mediated
transport of estrone sulfate. OAT4 interacted with chemically
heterogeneous anionic compounds, such as nonsteroidal anti-inflammatory
drugs, diuretics, sulfobromophthalein, penicillin G, and bile salts,
whereas tetraethylammonium, an organic cation, did not. OAT4 is the
first member of the multispecific organic anion transporter family,
which is expressed abundantly in the placenta. OAT4 might be
responsible for the elimination and detoxification of harmful anionic
substances from the fetus.
*
This work was supported in part by grants from the Japanese
Ministry of Education Science, Sports, and Culture, (grants-in-aid for
scientific research and High Tech Research Center), the Science Research Promotion Fund of the Japan Private School Promotion Foundation, the Uehara Memorial Foundation, and CREST (Core Research for Evolutional Science and Technology) of the Japan Science and Technology Corporation (JST).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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