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Biomarker Discovery for Cytochrome P450 1A2 Activity Assessment in Rats, Based on Metabolomics

1,2, 1,2, 1,2, 1,2, 1,2, 1,2,* and 1,2,*
Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), State Key Laboratory of Natural Medicine, China Pharmaceutical University, Nanjing 210009, China
Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing 210009, China
Authors to whom correspondence should be addressed.
Metabolites 2019, 9(4), 77;
Received: 1 April 2019 / Revised: 15 April 2019 / Accepted: 15 April 2019 / Published: 18 April 2019
PDF [1269 KB, uploaded 18 April 2019]


Cytochrome P450 1A2 (CYP1A2) is one of the major CYP450 enzymes (CYPs) in the liver, and participates in the biotransformation of various xenobiotics and endogenous signaling molecules. The expression and activity of CYP1A2 show large individual differences, due to genetic and environmental factors. In order to discover non-invasive serum biomarkers associated with hepatic CYP1A2, mass spectrometry-based, untargeted metabolomics were first conducted, in order to dissect the metabolic differences in the serum and liver between control rats and β-naphthoflavone (an inducer of CYP1A2)-treated rats. Real-time reverse transcription polymerase chain reaction and pharmacokinetic analysis of phenacetin and paracetamol were performed, in order to determine the changes of mRNA levels and activity of CYP1A2 in these two groups, respectively. Branched-chain amino acids phenylalanine and tyrosine were ultimately focalized, as they were detected in both the serum and liver with the same trends. These findings were further confirmed by absolute quantification via a liquid chromatography–tandem mass spectrometry (LC-MS/MS)-based targeted metabolomics approach. Furthermore, the ratio of phenylalanine to tyrosine concentration was also found to be highly correlated with CYP1A2 activity and gene expression. This study demonstrates that metabolomics can be a potentially useful tool for biomarker discovery associated with CYPs. Our findings contribute to explaining interindividual variations in CYP1A2-mediated drug metabolism. View Full-Text
Keywords: CYP1A2; endogenous biomarkers; metabolomics; branched-chain amino acids; phenylalanine; tyrosine CYP1A2; endogenous biomarkers; metabolomics; branched-chain amino acids; phenylalanine; tyrosine

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Pu, X.; Gao, Y.; Li, R.; Li, W.; Tian, Y.; Zhang, Z.; Xu, F. Biomarker Discovery for Cytochrome P450 1A2 Activity Assessment in Rats, Based on Metabolomics. Metabolites 2019, 9, 77.

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