Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 300, Issue -, Pages 737-744Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.08.014
Keywords
Pb; BDE209; Eisenia fetida; Subcellular partitioning; Gene transcription
Categories
Funding
- National Natural Science Foundation of China [41371467]
- Shanghai Pujiang Program [15PJD013]
- Major State Basic Research Development Program of China [2011CB200904]
- National Environmental Protection Public Welfare Science and Technology Research Program of China [201309047, 201309030]
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Lead (Pb) and decabromodiphenyl ether (BDE209) are the mainly co-existed contaminants at e-waste recycling sites. The potential toxicity of Pb (250 mu g g(-1)) to earthworm Eisenia fetida in the presence of BDE209 (1,10 and 100 mu g g(-1)) was determined during 14-d incubation period. Compared to Pb treatment alone, the co-exposure with 1 mu g g(-1) BDE209 barely affected Pb uptake, subcellular partitioning and gene expression; however, histopathological changes in earthworms' body wall (epidermal, circular and longitudinal muscles) demonstrated that 10 and 100 mu g g(-1) BDE209 additions enhanced Pb uptake and altered its subcellular partitioning, indicating that Pb redistributed from fractions E (cell debris) and D (metal-rich granules) to fraction C (cytosols); Additionally, BDE209 supply significantly inhibited (p <0.05) the induction of SOD (superoxide dismutase) and CAT (catalase) gene expressions (maximum down-regulation 59% for SOD gene at Pb + 100 mu g g(-1) BDE209 and 89% for CAT gene at Pb + 10 mu g g(-1) BDE209), while facilitated (p <0.05) Hsp90 (heat shock protein 90) gene expression with maximum induction rate of 120% after exposure to Pb + 10 mu g g(-1) BDE209. These findings illustrate the importance of considering environmental BDE209 co-exposure when assessing Pb bioaccumulation and toxicity in multi-contaminated soil ecosystems. (C) 2015 Elsevier B.V. All rights reserved.
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