A multiplex HRMS assay for quantifying selected human plasma bile acids as candidate OATP biomarkers

Bioanalysis
Brian RagoRagu Ramanathan

Abstract

Selected bile acids (BAs) in plasma have been proposed as endogenous probes for assessing drug-drug interactions involving hepatic drug transporters such as the organic anion-transporting polypeptides (OATP1B1 and OATP1B3). Plasma extracts were analyzed for selected BAs using a triple TOF API6600 high-resolution mass spectrometer. Glycodeoxycholic acid 3-sulfate, glycochenodeoxycholic acid 3-sulfate, glycodeoxycholic acid 3-O-β-glucuronide and glycochenodeoxycholic acid 3-O-β-glucuronide are presented as potential OATP1B1/3 biomarkers. Six BAs are quantified in human plasma using a multiplexed high-resolution mass spectrometry method. Glycodeoxycholic acid 3-sulfate and glycodeoxycholic acid 3-O-β-glucuronide are proposed as potential biomarkers based on observed four- to fivefold increase in plasma AUC (vs placebo), following administration of a compound known to present as an OATP1B1/3 inhibitor in vitro.

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