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Cancer Risk Assessment of Airborne PAHs Based on in Vitro Mixture Potency Factors
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 10
2017 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 51, no 15, 8805-8814 p.Article in journal (Refereed) Published
Abstract [en]

Complex mixtures of polycyclic aromatic hydrocarbons (PAHs) are common environmental pollutants associated with adverse human health effects including cancer. However, the risk of exposure to mixtures is difficult to estimate, and risk assessment by whole mixture potency evaluations has been suggested. To facilitate this, reliable in vitro based testing systems are necessary. Here, we investigated if activation of DNA damage signaling in vitro could be an endpoint for developing whole mixture potency factors (MPFs) for airborne PAHs. Activation of DNA damage signaling was assessed by phosphorylation of Chid and H2AX using Western blotting. To validate the in vitro approach, potency factors were determined for seven individual PAHs which were in very good agreement with established potency factors based on cancer data in vivo. Applying the method using Stockholm air PAH samples indicated MPFs with orders of magnitude higher carcinogenic potency than predicted by established in vivo-based potency factors. Applying the MPFs in cancer risk assessment suggested that 45.4 (6% of all) cancer cases per year in Stockholm are due to airborne PAHs. Applying established models resulted in <1 cancer case per year, which is far from expected levels. We conclude that our in vitro based approach for establishing MPFs could be a novel method to assess whole mixture samples of airborne PAHs to improve health risk assessment.

Place, publisher, year, edition, pages
2017. Vol. 51, no 15, 8805-8814 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-147140DOI: 10.1021/acs.est.7b02963ISI: 000406982600064PubMedID: 28650627OAI: oai:DiVA.org:su-147140DiVA: diva2:1144085
Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2017-09-25Bibliographically approved

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Lim, HwanmiGustafsson, JohanWesterholm, RogerJohansson, Christer
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CiteExportLink to record
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Citation style
  • apa
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