Carrier-mediated transport of tetrabromosulfoephthalein by rat liver plasma membrane vesicles

To investigate the molecular requirements and mechanisms for the hepatic uptake of phthaleins, the transport of tetrabromosulfonephthalein (TBS) was investigated in basolateral rat liver plasma membrane vesicles. TBS uptake was electrogenic as greatly accelerated by the creation of a positive-inside membrane potential by the addition of valinomycin in the presence of an inwardly directed potassium gradient. No effect was observed when the ionophore was added in the presence of a sodium gradient. The transport occurred into an osmotic-sensitive space and was saturable with an apparent Michaelis constant of 5.32 +/- 0.56 microM and a maximal velocity of 9.23 +/- 0.25 nmol.s-1.mg protein-1 (mean +/- SD, n = 3 experiments). TBS uptake was directly related to the extra-vesicular pH, indicating the deprotonated quinoid negative-charged form of the dye as the transported species. In contrast, TBS uptake was inversely related to the intravesicular pH, suggesting that protonation inside the vesicles may act as an efficient trap in transport process. Addition of polyclonal monospecific anti-bilitranslocase antibody to liver vesicles specifically inhibited TBS uptake rate (3.27 +/- 0.17 vs. 5.82 +/- 0.61 nmol.s-1.mg protein-1, n = 3, P less than 0.001). These data indicate that TBS is electrogenically transported across the liver cell plasma membrane by bilitranslocase. They also indicate that the presence of a negative charged group on the benzenic ring of the ligand is important in accounting for the transport.