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Many active components of herbal products are small organic anions, and organic anion transporters were previously demonstrated to be a potential site of drug-drug interactions. In this study, we assessed the inhibitory effects of six hydrophilic components of the herbal medicine Danshen, lithospermic acid, protocatechuic acid, rosmarinic acid, salvianolic acid A, salvianolic acid B, and tanshinol, on the function of the murine organic anion transporters, mOat1 and mOat3. All of Danshen components significantly inhibited mOat1- and mOat3-mediated substrate uptake ( P  < 0.001) with lithospermic acid (LSA), protocatechuic acid, rosmarinic acid (RMA), and salvianolic acid A (SAA) producing virtually complete inhibition under test conditions. Kinetic analysis demonstrated that LSA, RMA, and SAA were competitive inhibitors. As such,  K    i   values were estimated as 14.9 ± 4.9   μ  M for LSA, 5.5 ± 2.2   μ  M for RMA, and 4.9 ± 2.2   μ  M for SAA on mOat1-mediated transport, and as 31.1 ± 7.0   μ  M for LSA, 4.3 ± 0.2   μ  M for RMA, and 21.3 ± 7.7   μ  M for SAA on mOat3-mediated transport. These data suggest that herb-drug interactions may occur  in vivo  on the human orthologs of these transporters in situations of polypharmacy involving Danshen and clinical therapeutics known to be organic anion transporter substrates.

evidence-based complementary and alternative medicine

Active Hydrophilic Components of the Medicinal Herb<i>Salvia miltiorrhiza</i>(Danshen) Potently Inhibit Organic Anion Transporters 1 (Slc22a6) and 3 (Slc22a8)

Active Hydrophilic Components of the Medicinal HerbSalvia miltiorrhiza(Danshen) Potently Inhibit Organic Anion Transporters 1 (Slc22a6) and 3 (Slc22a8)