Document Detail


Selenium Reduces the Retention of Methyl Mercury in the Brown Shrimp Crangon crangon.
MedLine Citation:
PMID:  22550937     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Methyl mercury accumulated at the top of aquatic food chains constitutes a toxicological risk to humans and other top predators. Since the methyl mercury enters the aquatic food chains at the lower trophic levels, uptake and elimination processes at these levels affect the methyl mercury content at the higher levels. Selenium modulates the biokinetics of mercury in aquatic organisms in fairly complex ways, increasing mercury retention in some aquatic mammals, but decreasing methyl mercury retention in fish. However, it is not known if selenium modulates methyl mercury accumulation at lower trophic levels in aquatic food chains. Here we show that selenium administered via the food augments the elimination of methyl mercury from marine shrimps and that the effect is dose-dependent, demonstrable down to natural selenium concentrations in aquatic food items. Selenite, seleno-cystin and seleno-methionine exert this effect, but selenate does not. Our results suggest that the selenium naturally present at the lower trophic levels in marine food chains may play an essential role as a modifier of methyl mercury accumulation at these levels, thereby potentially also affecting biomagnification of methyl mercury towards the higher trophic levels in the aquatic food chains.
Authors:
Poul Bjerregaard; Alan Christensen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-1
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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