Co-localization and interaction of human organic anion transporter 4 with caveolin-1 in primary cultured human placental trophoblasts.

The human organic anion transporter 4 (hOAT4) has been identified as the fourth isoform of OAT family. hOAT4 contributes to move several negatively charged organic compounds between cells and their extracellular milieu. The functional characteristics and regulatory mechanisms of hOAT4 remain to be elucidated.