Abstract
Traditionally, drug-induced changes in cytochrome P450 isoenzyme activity, causing changes in drug metabolism and bioavailability, have been the main focus of drug interaction studies. Recent research, however, suggests that the drug transporters P-glycoprotein and organic anion transporting peptide (OATP), which can effect the efflux and influx of many classes of drugs, may contribute to drug interactions by mechanisms independent of oxidative metabolism. Experimental models designed to selectively probe the function of P-glycoprotein or OATP have demonstrated that changes in the activities of these transporters may have a significant effect on the bioavailability of clinically important drugs, leading to the potential for adverse drug interactions.
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