Ozonation attenuates the steroidogenic disruptive effects of sediment free oil sands process water in the H295R cell line
He, Yuhe（ Univ Saskatchewan, Toxicol Ctr, Saskatoon, SK S7 N 5B3, Canada）
Wiseman, Steve B.（ Univ Saskatchewan, Toxicol Ctr, Saskatoon, SK S7 N 5B3, Canada）
Zhang, Xiaowei（ Univ Saskatchewan, Toxicol Ctr, Saskatoon, SK S7 N 5B3, Canada）
Hecker, Markus（ Univ Saskatchewan, Toxicol Ctr, Saskatoon, SK S7 N 5B3, Canada）
Jones, Paul D.（ Univ Saskatchewan, Toxicol Ctr, Saskatoon, SK S7 N 5B3, Canada）
El-Din, Mohamed Gamal（Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB, Canada）
Martin, Jonathan W.（ Univ Alberta, Dept Lab Med & Pathol, Div Analyt & Environm Chem, Edmonton, AB, Canada）
Giesy, John P.
- 海洋环境－已发表论文 
There is concern regarding oil sands process water (OSPW) produced by the oil sands industry in Alberta, Canada. Little is known about the potential for OSPW, and naphthenic acids (NAs), which are the primary persistent and toxic constituents of OSPW, to affect endocrine systems. Although ozonation significantly reduces concentrations of NAs and OSPW toxicity, it was hypothesized that oxidation of OSPW might produce hydroxylated products with steroidogenic activity. Therefore, untreated and ozone treated OSPW were examined for effects on sex steroid production using the H295R Steroidogenesis Assay. Untreated OSPW significantly decreased testosterone (T) and increased 17 beta-estradiol (E2) concentrations at OSPW dilutions greater or equal to 10-fold. This effect was mainly due to decreased U metabolism. Analysis of CYP19A (aromatase) mRNA abundance and enzyme activity suggested that induction of this enzyme activity may have also contributed to these effects. Reduction of parent NA concentrations by 24% or 85% decreased the effect of OSPW on E2 production. Although T production remained significantly reduced in cells exposed to ozone treated OSPW, the effect was diminished. Aromatase mRNA abundance and enzyme activity were significantly greater in cells exposed to ozone treated OSPW. however the magnitude was less than in cells exposed to untreated OSPW. No change of U metabolism was observed in cells exposed to ozone treated OSPW, which may account for recovery of E2 levels. The results indicate that OSPW exposure can decrease E2 and T production, but zonation is an effective treatment to reduce NA concentrations in OSPW without increasing affects on steroidogenesis. (C) 2010 Elsevier Ltd. All rights reserved.
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