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Endocrine disrupting potential of PAHs and their alkylated analogues associated with oil spills

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Abstract

Polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs are known to be major toxic contaminants in spills of petroleum hydrocarbons (oil). Spilled oil undergoes weathering and over time, PAHs go through a series of compositional changes. PAHs can disrupt endocrine functions, and the type of functions affected and associated potencies vary with the type and alkylation status of PAH. In this study, the potential of five major PAHs of crude oil, i.e., naphthalene, fluorene, dibenzothiophene, phenanthrene, and chrysene, and their alkylated analogues (n = 25), to disrupt endocrine functions was evaluated by use of MVLN-luc and H295R cell lines. In the MVLN-luc bioassay, seven estrogen receptor (ER) agonists were detected among 30 tested PAHs. The greatest ER-mediated potency was observed for 1-methylchrysene (101.4%), followed by phenanthrene and its alkylated analogues (range of %-E2max from 1.6% to 47.3%). In the H295R bioassay, significantly greater syntheses of steroid hormones were observed for 20 PAHs. For major PAHs and their alkylated analogues, disruption of steroidogenesis appeared to be more significant than ER-mediated effects. The number and locations of alkyl-moieties alone could not explain differences in the types or the potencies of toxicities. This observation shows that disruption of endocrine functions by some constituents of oil spills could be underestimated if only parent compounds are considered in assessments of hazard and risk.

Graphical abstract: Endocrine disrupting potential of PAHs and their alkylated analogues associated with oil spills

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Publication details

The article was received on 16 Mar 2017, accepted on 14 Jul 2017 and first published on 18 Jul 2017


Article type: Paper
DOI: 10.1039/C7EM00125H
Citation: Environ. Sci.: Processes Impacts, 2017, Advance Article
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    Endocrine disrupting potential of PAHs and their alkylated analogues associated with oil spills

    S. Lee, S. Hong, X. Liu, C. Kim, D. Jung, U. H. Yim, W. J. Shim, J. S. Khim, J. P. Giesy and K. Choi, Environ. Sci.: Processes Impacts, 2017, Advance Article , DOI: 10.1039/C7EM00125H

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