| Modification Notes |
The organic anion transporting polypeptides, Oatp2 (also designated Slc21a5 and Slco1a4) and OATP-C (also designated LST-1, OATP2, OATP1B1 and SLC21A6), mediate hepatic uptake of cardiac glycosides. The expression of OATP-C is inducible by phenobarbital and pregnenolone-16a-carbonitrile, resulting in the increased capacity of the liver to extract cardiac glycosides from the plasma. Oatp2, which is expressed in liver and brain, helps mediate sodium-independent uptake of the anionic steroid conjugates dehydroepiandrosterone sulfate, estradiol-17-glucuronide and prostaglandin. OATP-C is exclusively expressed in liver and localized to the basolateral hepatocyte membrane. Although OATP-C mRNA levels decrease during pregnancy and increase postpartum, OATP-C protein levels remain relatively constant. Oatp2 transports taurocholic acid, the adrenal androgen dehydroepiandroserone sulfate, thyroid hormone, hydroxymethylglutaryl-CoA reductase inhibitor and pravastatin. Oatp2 and OATP-C are both pravastatin transporters, suggesting that they are responsible for the hepatic uptake of the liver-specific hydroxymethylglutaryl-CoA reductase inhibitor in mouse, rat and human. |