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Supplemental role of the Ames mutation assay and gap junction intercellular communication in studies of possible carcinogenic compounds from diesel exhaust particles

  • Genotoxicity
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Abstract

This study presents a new strategy for the carcinogenic evaluation of complex chemical mixtures based on genotoxic and nongenotoxic assays. We studied the ability of organic extracts of diesel exhaust particles (DEP) to induce point mutations in five different Salmonella typhimurium strains (Ames test) and to inhibit gap junction intercellular communication (GJIC) in rat liver epithelial cell lines. A crude extract of DEP was prepared by extraction with dichloromethane (DCM), and fractionated according to polarity into five fractions: aliphatic hydrocarbons, polycyclic aromatic hydrocarbons (PAH), nitro-PAH, dinitro-PAH, and polar compounds. Statistical experimental design, multivariate data analysis, and modeling were used to quantify the mutagenicity of individual and combined DEP fractions in the Ames assay. Quantitative determination of GJIC was carried out using a recently described combination of scrape loading and digital image analysis. Both assays responded to the DEP extract, but the responses were due to different fractions. The nitro-PAH fraction showed the strongest mutagenic potential, followed by the dinitro-PAH fraction. The effect on GJIC was due to the fraction containing the polar components, followed by the dinitro-PAH fraction. The extract was found to induce both basepair substitutions and frameshift mutations, through activation by bacterial nitroreductases. Hyperphosphorylation of connexin43, the major connexin in the epithelial cell lines, was less evident for DEP extract than for other communication inhibitors such as phorbol esters and growth factors, and consequently inhibitors of the protein kinase C (PKC) and mitogen-activated protein (MAP) kinase pathway were unable to counteract the inhibition by DEP extract. Since the Ames test is a well accepted method to screen for substances with genotoxic activity while inhibition of GJIC is associated with effect of tumor promoters and nongenotoxic carcinogens, it is not surprising but encouraging and interesting that the present data indicate that the two endpoints supplement each other as screening tests and in the evaluation of hazardous compounds in complex mixtures.

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Acknowledgements

The authors are grateful to Solveig Engen, Statoil Research Centre, for valuable support and discussions, and to Astri Nordahl and Randi Skibakk, Institute for Cancer Research, for excellent technical assistance.

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  1. Oddvar Myhre

    Present address: Amersham Health AS, Nycoveien 2, Nydalen, P.O. Box 4220, 0401, Oslo, Norway

Authors and Affiliations

  1. Institute for Cancer Research, Norwegian Radium Hospital, Montebello, 0310, Oslo, Norway

    Edgar Rivedal & Tore Sanner

  2. Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway

    Oddvar Myhre

  3. Statoil Research Centre, 7005, Trondheim, Norway

    Ingvar Eide

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  1. Edgar Rivedal
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Correspondence to Edgar Rivedal.

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Rivedal, E., Myhre, O., Sanner, T. et al. Supplemental role of the Ames mutation assay and gap junction intercellular communication in studies of possible carcinogenic compounds from diesel exhaust particles. Arch Toxicol 77, 533–542 (2003). https://doi.org/10.1007/s00204-003-0483-6

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  • DOI: https://doi.org/10.1007/s00204-003-0483-6

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