Identification of phalloidin uptake systems of rat and human liver

Biochimica Et Biophysica Acta
F Meier-AbtB Hagenbuch

Abstract

To determine whether the liver toxin phalloidin is transported into hepatocytes by one of the known bile salt transporters, we expressed the sodium-dependent Na+/taurocholate cotransporting polypeptide (Ntcp) and several sodium-independent bile salt transporters of the organic anion transporting polypeptide (OATP/SLCO) superfamily in Xenopus laevis oocytes and measured uptake of the radiolabeled phalloidin derivative [3H]demethylphalloin. We found that rat Oatp1b2 (previously called Oatp4 (Slc21a10)) as well as human OATP1B1 (previously called OATP-C (SLC21A6)) and OATP1B3 (previously called OATP8 (SLC21A8)) mediate uptake of [3H]demethylphalloin when expressed in X. laevis oocytes. Transport of increasing [3H]demethylphalloin concentrations was saturable with apparent Km values of 5.7 microM (Oatp1b2), 17 microM (OATP1B1) and 7.5 microM (OATP1B3). All other tested Oatps/OATPs as well as the rat liver Ntcp did not transport [3H]demethylphalloin. Therefore, we conclude that rat Oatp1b2 as well as human OATP1B1 and OATP1B3 are responsible for phalloidin uptake into rat and human hepatocytes.

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