Inhibition of SLC drug transporter activities by environmental bisphenols.

Inhibition of SLC drug transporter activities by environmental bisphenols.

Bruyere, Arnaud;Hubert, Céline;Le Vee, Marc;Chedik, Lisa;Sayyed, Katia;Stieger, Bruno;Denizot, Claire;Parmentier, Yannick;Fardel, Olivier;
toxicology in vitro : an international journal published in association with bibra 2017 Vol. 40 pp. 34-44
319
bruyere2017inhibitiontoxicology

Abstract

The plastic component bisphenol A (BPA) is suspected to exert deleterious effects towards human health and targets various cellular and molecular pathways, including activity of ATP-binding cassette drug transporters. The present study was designed to determine whether BPA and some derivatives, like its substitutes bisphenol F (BPF) and bisphenol S (BPS) and the flame retardant tetrabromobisphenol A (TBBPA), may additionally interact with solute carrier (SLC) drug transporters. Activities of the various following SLC transporters were inhibited in a major way (by >60%) by 100μM bisphenols: OCT1 and MATE1 (by BPA and TBBPA), OATP1B1 (by BPA, BPF and TBBPA), OATP1B3 and NTCP (by TBBPA) and OAT3 (by BPA, BPF, BPS and TBBPA); by contrast, activities of other transporters were not impacted (MATE2-K) or were stimulated (notably OCT1 by BPS and OCT2 by BPF). Transporter inhibitions due to bisphenols were concentrations-dependent, with half maximal inhibitory concentrations (IC) ranging from 0.5μM to 73.5μM. BPA was finally shown to be not transported by OAT3, although inhibiting this transporter in a competitive manner. Taken together, these data indicate that bisphenols interact with SLC transporters, at concentration levels however rather higher than those occurring in humans in response to environmental exposure.

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