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An improved substrate cocktail for assessing direct inhibition and time-dependent inhibition of multiple cytochrome P450s.

Abstract：

AIM:The substrate cocktail is frequently used to evaluate cytochrome P450 (CYP) enzyme-mediated drug interactions and potential interactions among the probe substrates. Here, we re-optimized the substrate cocktail method to increase the reliability and accuracy of screening for candidate compounds and expanded the method from a direct CYP inhibition assay to a time-dependent inhibition (TDI) assay. METHODS:In the reaction mixtures containing human liver microsome (0.1 mg/mL), both the concentrations of a substrate cocktail (phenacetin for 1A2, coumarin for 2A6, bupropion for 2B6, diclofenac for 2C9, dextromethorphan for 2D6, and testosterone for 3A4) and the incubation time were optimized. Metabolites of the substrate probes were simultaneously analyzed by multiple-reaction monitoring (MRM) using a routine LC/MS/MS. Direct CYP inhibition was validated using 7 inhibitors (α-naphthoflavone, tranylcypromine, ticlopidine, fluconazole, quinidine, ketoconazole and 1-ABT). The time-dependent inhibition was partially validated with 5 inhibitors (ketoconazole, verapamil, quinidine, paroxetine and 1-ABT). RESULTS:The inhibition curve profiles and IC50 values of 7 CYP inhibitors were approximate when a single substrate and the substrate cocktail were tested, and were consistent with the previously reported values. Similar results were obtained in the IC50 shifts of 5 inhibitors when a single substrate and the substrate cocktail were tested in the TDI assay. CONCLUSION:The 6-in-1 substrate cocktail (for 1A2, 2A6, 2B6, 2C9, 2D6 and 3A) is reliable for assessing CYP inhibition and time-dependent inhibition of drug candidates.

journal_name

Acta Pharmacol Sin

journal_title

Acta pharmacologica Sinica

authors

Chen ZH,Zhang SX,Long N,Lin LS,Chen T,Zhang FP,Lv XQ,Ye PZ,Li N,Zhang KZ

doi

10.1038/aps.2016.10

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

708-18

issue

5

eissn

1671-4083

issn

1745-7254

pii

aps201610

journal_volume

37

pub_type

杂志文章

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