New insight into organic anion transporters from the perspective of potentially important interactions and drugs toxicity.

ABSTRACT

The family of organic anion transporters (OATs) includes a group of over 10 transmembrane transporting proteins belonging to the solute carrier 22 subfamilies of the major facilitator superfamily. Their function is related to the transport of a great variety of organic anions against the electrical and chemical gradient. OATs are present in most types of human tissues, including the kidneys, liver, placenta, olfactory epithelium, retina, and choroid plexus tissues. The OATs family plays an important role in the cellular uptake, distribution, excretion, and detoxification of many water-soluble drugs, endogenous compounds, nutrition ingredients, environmental contaminants and toxins, and significantly impacts their efficacy, pharmacokinetics and toxicity, both in a preferable and unfavorable way. OATs demonstrated great potential to participate in many potentially relevant interactions, which may lead to unexpected, but not always detrimental, effects. Wider knowledge about their specific functions in the body, role in disease states, pharmacokinetics interactions, and intraindividual response to therapeutic treatment will allow to predict and prevent OAT-related adverse effects or use favorable interactions in pharmacotherapy, as well as to rationally design therapeutics targeted at individual transporter drugs with improved bioavailability, prolonged half-life or reduced toxicity, and improve safety guidelines concerning drug dosage. This review gathers recent reports regarding OAT-related essential interactions involving components of popular therapeutic herbal products, dietary supplements, and clinically important drugs, their significance and potential suitability in modulating the severity of drug-related side effects and toxicity mechanisms.