Document Detail


Subcellular controls of mercury trophic transfer to a marine fish.
MedLine Citation:
PMID:  20663575     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Different behaviors of inorganic mercury [Hg(II)] and methylmercury (MeHg) during trophic transfer along the marine food chain have been widely reported, but the mechanisms are not fully understood. The bioavailability of ingested mercury, quantified by assimilation efficiency (AE), was investigated in a marine fish, the grunt Terapon jarbua, based on mercury subcellular partitioning in prey and purified subcellular fractions of prey tissues. The subcellular distribution of Hg(II) differed substantially among prey types, with cellular debris being a major (49-57% in bivalves) or secondary (14-19% in other prey) binding pool. However, MeHg distribution varied little among prey types, with most MeHg (43-79%) in heat-stable protein (HSP) fraction. The greater AEs measured for MeHg (90-94%) than for Hg(II) (23-43%) confirmed the findings of previous studies. Bioavailability of each purified subcellular fraction rather than the proposed trophically available metal (TAM) fraction could better elucidate mercury assimilation difference. Hg(II) associated with insoluble fraction (e.g. cellular debris) was less bioavailable than that in soluble fraction (e.g. HSP). However, subcellular distribution was shown to be less important for MeHg, with each fraction having comparable MeHg bioavailability. Subcellular distribution in prey should be an important consideration in mercury trophic transfer studies.
Authors:
Fei Dang; Wen-Xiong Wang
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Aquatic toxicology (Amsterdam, Netherlands)     Volume:  99     ISSN:  1879-1514     ISO Abbreviation:  Aquat. Toxicol.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-20     Completed Date:  2010-12-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8500246     Medline TA:  Aquat Toxicol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  500-6     Citation Subset:  IM    
Copyright Information:
2010 Elsevier B.V. All rights reserved.
Affiliation:
Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Biological Availability
Environmental Pollutants / pharmacokinetics*
Food Chain*
Hong Kong
Mercury / pharmacokinetics*
Mercury Radioisotopes / analysis
Methylmercury Compounds / pharmacokinetics*
Perciformes / metabolism*
Subcellular Fractions / metabolism
Chemical
Reg. No./Substance:
0/Environmental Pollutants; 0/Mercury Radioisotopes; 0/Methylmercury Compounds; 7439-97-6/Mercury

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


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