Disruption of small molecule transporter systems by Transporter-Interfering Chemicals (TICs).

FEBS Letters
Sascha C T Nicklisch, Amro Hamdoun

Abstract

Small molecule transporters (SMTs) in the ABC and SLC families are important players in disposition of diverse endo- and xenobiotics. Interactions of environmental chemicals with these transporters were first postulated in the 1990s, and since validated in numerous in vitro and in vivo scenarios. Recent results on the co-crystal structure of ABCB1 with the flame-retardant BDE-100 demonstrate that a diverse range of man-made and natural toxic molecules, hereafter termed transporter-interfering chemicals (TICs), can directly bind to SMTs and interfere with their function. TIC-binding modes mimic those of substrates, inhibitors, modulators, inducers, and possibly stimulants through direct and allosteric mechanisms. Similarly, the effects could directly or indirectly agonize, antagonize or perhaps even prime the SMT system to alter transport function. Importantly, TICs are distinguished from drugs and pharmaceuticals that interact with transporters in that exposure is unintended and inherently variant. Here, we review the molecular mechanisms of environmental chemical interaction with SMTs, the methodological considerations for their evaluation, and the future directions for TIC discovery.

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Citations

Mar 24, 2021·FEBS Letters·Amro HamdounKarl Kuchler
Jun 12, 2021·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Sascha C T NicklischAmro Hamdoun

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