The development, characterization, and application of an OATP1B1 inhibition assay in drug discovery

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Matthew G SoarsRobert J Riley

Abstract

The pivotal role of organic anion-transporting polypeptide 1B1 (OATP1B1) in drug disposition has become clear over the last decade. Therefore, an OATP1B1 inhibition assay suitable for use within early drug discovery was developed and characterized. IC(50) estimates for 10 literature compounds using pitavastatin and estradiol-17β-glucuronide as substrates were within 2-fold of each other. In addition, the IC(50) estimates using pitavastatin uptake agreed well with literature values (r(2) = 0.92, average fold error = 1.3). However, when estrone-3-sulfate was used, OATP1B1 inhibition was underpredicted by as much as 10-fold. A comparison of uptake in human hepatocytes and OATP1B1 inhibition showed a significant correlation (r(2) = 0.53, P < 0.001) for more than 40 compounds. These data suggest that, for discrete chemical series, OATP1B1 inhibition data may be used as a surrogate for more costly and time-consuming uptake studies in hepatocytes. OATP1B1 inhibition data, determined for over 260 compounds representing both internal AstraZeneca and literature chemistry, were also used to generate a continuous in silico model. The robustness of the model was demonstrated by accurately predicting OATP1B1 inhibition for external test sets...Continue Reading

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