Document Detail


Residue-response relationship between PAH body burdens and lysosomal membrane destabilization in eastern oysters (Crassostrea virginica) and toxicokinetics of PAHs.
MedLine Citation:
PMID:  18780214     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study was undertaken to establish residue-response relationship between lysosomal destabilization and body residues of multiple PAHs in eastern oysters (Crassostrea virginica) exposed to a mixture of PAHs for 25 days in laboratory aquariums. The contaminated oysters were then placed in clean aquariums for 20 days to allow them to depurate and recover. The lysosomal destabilization was linearly correlated with the PAH body burdens. Regression analysis showed that critical body residue (CBR), in terms of lysosomal destabilization (at least 50% of destabilized cells), was found at 2,100 ng/g (9.32 nmol/g) of total PAHs. This CBR is much lower than the CBRs for reproduction and death, confirming that lysosomal destabilization, as a cellular level biomarker, appears to be functioning as an early warning indicator that can be used to detect aquatic contamination much before severe effects are observed. During 25 days of exposure, the lysosomal destabilization and PAH body burdens increased from 32 to 75% and 77 to 5,925 ng/g, respectively. After 20 days of elimination period, the lysosomal destabilization and PAH body burdens decreased to 49% and 2,350 ng/g, respectively. Uptake rates of PAHs showed parabolic shaped correlation with hydrophobicity (K(ow)). Uptake rate constants of more hydrophobic PAHs (log K(ow) > 4.6) had a negative correlation with K(ow), implying that hydrophobicity alone is not a satisfactory predictor for these PAHs. Elimination half-lives varied from 4 to 96 days and bioconcentration factors ranged from 650 to 160,000. Fugacity ratios (f(o)/f(w)) indicated that equilibrium still was not reached at the end of the uptake period. Data obtained from the three replicate aquariums, which were operated at the same time under the same condition, showed good replicability (RPD < 30%).
Authors:
Hyun-Min Hwang; Terry L Wade; Jose L Sericano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  43     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-09-09     Completed Date:  2008-12-03     Revised Date:  2009-08-14    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1373-80     Citation Subset:  IM    
Affiliation:
Civil and Environmental Engineering Dept., University of California, Davis, Davis, California 95616, USA. hmhwang@ucdavis.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Intracellular Membranes / drug effects*
Lysosomes / drug effects*,  metabolism
Ostreidae / metabolism*
Polycyclic Hydrocarbons, Aromatic / pharmacokinetics*,  toxicity*
Regression Analysis
Chemical
Reg. No./Substance:
0/Polycyclic Hydrocarbons, Aromatic

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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