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Effect of chrysin, a flavonoid compound, on the mutagenic activity of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and benzo(a)pyrene (B(a)P) in bacterial and human hepatoma (HepG2) cells

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Abstract

The aim of the present study was to investigate the antimutagenic effects of chrysin (CR), a flavonoid compound contained in many fruits, vegetables and honey. Earlier investigations with bacterial indicators showed that CR is one of the most potent antimutagens among the flavonoids. In the present study, we tested the compound in the Salmonella strains TA98 and TA100 in combination with benzo(a)pyrene (B(a)P) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and found pronounced protective activity over a concentration range between 10 and 100 μg/ml. The compound itself was devoid of mutagenic activity at all concentrations tested. In the micronucleus (MN) assay with human-derived HepG2 cells, a different pattern of activity was seen. CR itself caused significant induction of MN at dose levels ≥15 μg/ml; in combination experiments with B(a)P and PhIP, U-shaped dose-response curves were obtained and protection was found only in a narrow dose range (5 – 10 μg/ml). Our findings indicate that the molecular mechanisms that account for the antimutagenic effects of CR in bacterial cells are different from those responsible for the effects in HepG2 cells. Earlier reports indicate that the antimutagenic effects of CR towards B(a)P and heterocyclic amines in bacterial indicators is due to inhibition of the activity of CYP1A. In contrast to this, we found a significant induction of CYP1A1 activity in HepG2 cells by CR. It can also be excluded that induction of GST, which is involved in the detoxification of polycyclic aromatic hydrocarbons accounts for the protective effects of CR against B(a)P since this enzyme was not significantly induced in the HepG2 cells. In the case of PhIP, induction of UDGPT and/or inhibition of sulfotransferase seen in human derived HepG2 cells after exposure to CR might play a role in the antimutagenic effects. In conclusion, our findings show that data from antimutagenicity studies with bacterial indicators cannot be extrapolated to HepG2 cells, and that CR causes genotoxic effects at higher dose levels in the latter cells. The implications of these observations for human chemoprevention strategies are discussed.

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Acknowledgements

The experimental work was sponsored by EU grants (HEPANDA and HC-Amines to E.LE and S.K). The authors want to thank S. Garrido, S. Lorry and K. Gloux for their helpful technical assistance.

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Authors and Affiliations

  1. Institute of Cancer Research, Borschkegasse 8A, 1090 Vienna, Austria

    Maria Uhl, Fekadu Kassie, Asima Chakraborty & Siegfried Knasmüller

  2. Austrian Environmental Protection Agency, Vienna, Austria

    Sonja Ecker

  3. Institut de la Recherche Agronomique, Jouy-en-Josas, France

    Evelyne Lhoste

  4. MGC, Department of Radiation Genetics and Chemical Mutagenesis, Leiden, The Netherlands

    Georges Mohn

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  1. Maria Uhl
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  2. Sonja Ecker
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  3. Fekadu Kassie
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Correspondence to Siegfried Knasmüller.

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Uhl, M., Ecker, S., Kassie, F. et al. Effect of chrysin, a flavonoid compound, on the mutagenic activity of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and benzo(a)pyrene (B(a)P) in bacterial and human hepatoma (HepG2) cells. Arch Toxicol 77, 477–484 (2003). https://doi.org/10.1007/s00204-003-0469-4

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