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    J Biol Chem. 1999 Jun 11;274(24):17159-63.

    Identification of a novel gene family encoding human liver-specific organic anion transporter LST-1.

    Abe T, Kakyo M, Tokui T, Nakagomi R, Nishio T, Nakai D, Nomura H, Unno M, Suzuki M, Naitoh T, Matsuno S, Yawo H.

    Department of Neurophysiology, Tohoku University School of Medicine, Sendai, 980-8575, Tokyo, 140-8710, Japan. takaabe@mail.cc.tohoku.ac.jp

    We have isolated a novel liver-specific organic anion transporter, LST-1, that is expressed exclusively in the human, rat, and mouse liver. LST-1 is a new gene family located between the organic anion transporter family and prostaglandin transporter. LST-1 transports taurocholate (Km = 13.6 microM) in a sodium-independent manner. LST-1 also shows broad substrate specificity. It transports conjugated steroids (dehydroepiandrosterone sulfate, estradiol-17beta-glucuronide, and estrone-3-sulfate), eicosanoids (prostaglandin E2, thromboxane B2, leukotriene C4, leukotriene E4), and thyroid hormones (thyroxine, Km = 3.0 microM and triiodothyronine, Km = 2.7 microM), reflecting hepatic multispecificity. LST-1 is probably the most important transporter in human liver for clearance of bile acids and organic anions because hepatic levels of another organic anion transporter, OATP, is very low. This is also the first report of the human molecule that transports thyroid hormones.

    PMID: 10358072 [PubMed - indexed for MEDLINE]

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    • Thyroid (Armour® Thyroid)

      Thyroid is a hormone produced by the body. When taken correctly, thyroid is used to treat the symptoms of hypothyroidism (a condition where the thyroid gland does not produce enough thyroid hormone). Symptoms of hypothyr...

    • Levothyroxine (Levothroid®, Levoxyl®, Synthroid®, ...)

      Levothyroxine, a thyroid hormone, is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Without this hormone, the body cannot function properly, resulting in poor g...

    • Liothyronine (Cytomel®)

      Liothyronine, a thyroid hormone, is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Without this hormone, the body cannot function properly, resulting in poor gr...

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