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Related Experiment Video

Updated: Jun 5, 2026

Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification
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Quantitative protein determination for CYP induction via LC-MS/MS.

Brian L Williamson1, Subhasish Purkayastha, Christie L Hunter

  • 1AB SCIEX, Framingham, MA 01701, USA. Brian.Williamson@absciex.com

Proteomics
|December 25, 2010
PubMed
Summary

A new LC-MS method accurately quantifies Cytochrome P450 (CYP) proteins, crucial for drug safety. This high-throughput assay measures specific peptides, offering reliable results for drug development and CYP induction studies.

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Published on: October 25, 2019

Area of Science:

  • Biochemistry
  • Pharmacology
  • Analytical Chemistry

Background:

  • Cytochrome P450 (CYP) proteins are key drug-metabolizing enzymes.
  • Accurate quantification of CYP induction is vital for drug safety and efficacy assessment.

Purpose of the Study:

  • To develop and validate a gel-free, high-throughput LC-MS method for quantifying major CYP isoforms (1A2, 2B6, 3A4, 3A5).
  • To assess the method's utility in CYP induction assays using hepatic microsomal preparations.

Main Methods:

  • Utilized liquid chromatography-mass spectrometry (LC-MS) for quantifying isoform-specific peptides.
  • Employed enzymatic digestion of hepatocyte incubations and synthetic stable isotope-labeled peptides as internal standards.
  • Enabled both relative and absolute quantification of CYP proteins.

Main Results:

  • The LC-MS method demonstrated good correlation with mRNA and activity for induced CYP1A2, CYP2B6, and CYP3A4.
  • Observed a minor fold change in CYP3A5 induction with phenobarbital.
  • Achieved reproducible results with an average coefficient of variation (CV) below 10%.

Conclusions:

  • The developed LC-MS method is a robust assay for CYP protein quantitation.
  • This approach is suitable for high-throughput CYP induction assays, aiding drug disposition and safety evaluations.