Imperial College London

DrTimothyEbbels

Faculty of MedicineDepartment of Metabolism, Digestion and Reproduction

Reader in Computational Bioinformatics
 
 
 
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Contact

 

+44 (0)20 7594 3160t.ebbels Website

 
 
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Location

 

131Sir Alexander Fleming BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{David:2016:10.1289/ehp.1409557,
author = {David, R and Ebbels, T and Gooderham, N},
doi = {10.1289/ehp.1409557},
journal = {Environmental Health Perspectives},
pages = {88--96},
title = {Synergistic and Antagonistic Mutation Responses of Human MCL-5 Cells to Mixtures of Benzo[a]pyrene and 2-Amino-1-Methyl-6-Phenylimidazo[4,5-b]pyridine: Dose-Related Variation in the Joint Effects of Common Dietary Carcinogens.},
url = {http://dx.doi.org/10.1289/ehp.1409557},
volume = {124},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - BACKGROUND: Chemical carcinogens such as benzo[a]pyrene (BaP) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) may contribute to the etiology of human diet-associated cancer. Individually, these are genotoxic, but the consequences of exposure to mixtures of these chemicals have not been systematically examined. OBJECTIVES: To determine the mutagenic response to mixtures of BaP and PhIP at concentrations relevant to human exposure (mM to sub-nM). METHODS: Human MCL-5 cells (metabolically competent) were exposed to BaP or PhIP individually or in mixtures. Mutagenicity was assessed at the thymidine kinase (TK) locus, CYP1A activity and message determined by Ethoxyresorufin-O-deethylase (EROD) activity and Q-PCR respectively, and cell cycle measured by flow cytometry. RESULTS: Mixtures gave modified dose-responses compared to the individual chemicals; a remarkable increased mutant frequency (MF) at low concentration combinations (not mutagenic individually), and decreased MF at higher concentration combinations, compared to the calculated predicted additive MF of the individual chemicals. EROD activity and CYP1A1 mRNA levels correlated with TK MF supporting involvement of the CYP1A family in mutation. Moreover, a cell cycle G2/M phase block was observed at high dose combinations, consistent with DNA damage sensing and repair. CONCLUSIONS: Mixtures of these genotoxic chemicals produced mutation responses that differed from expectations for additive effects of the individual chemicals. The increase in MF for some combinations of chemicals at low concentrations that were not genotoxic for the individual chemicals, and the non-monotonic dose response, may be important for understanding the mutagenic potential of food and the etiology of diet-associated cancers.
AU - David,R
AU - Ebbels,T
AU - Gooderham,N
DO - 10.1289/ehp.1409557
EP - 96
PY - 2016///
SN - 1552-9924
SP - 88
TI - Synergistic and Antagonistic Mutation Responses of Human MCL-5 Cells to Mixtures of Benzo[a]pyrene and 2-Amino-1-Methyl-6-Phenylimidazo[4,5-b]pyridine: Dose-Related Variation in the Joint Effects of Common Dietary Carcinogens.
T2 - Environmental Health Perspectives
UR - http://dx.doi.org/10.1289/ehp.1409557
UR - http://hdl.handle.net/10044/1/24640
VL - 124
ER -