Document Detail

Transfer and distribution of lead in the asteroid Asterias rubens following ingestion of contaminated food: a radiotracer study.
MedLine Citation:
PMID:  12474959     Owner:  NLM     Status:  MEDLINE    
A radiotracer technique using 210Pb was applied to quantify the transfer and distribution of lead in the asteroid Asterias rubens following a single ingestion of radio-labelled mussels under controlled laboratory conditions. Approximately 50% of the 210Pb accumulated by mussels in their soft tissues from seawater was transferred to the asteroid through the food pathway resulting in a transfer factor less than unity. Loss kinetics of 210Pb in the asteroid were best described by a two-component exponential model. A. rubens eliminated 56% +/- 5% of the ingested 210Pb in a few days while the remaining fraction (42% +/- 5%), was absorbed and eliminated very slowly. Following ingestion, 210Pb was accumulated in the pyloric caeca and the body wall with little radioisotope found in the coelomic fluid. Lead-210 was then transferred to the organic matrix of the body wall through the general body cavity via the coelomic fluid, and then to the skeleton. In this way, lead appears to be progressively eliminated from the organic matrix of the body wall while it is efficiently trapped in the calcite skeleton. The sequestration and retention of lead in the skeleton is considered as a detoxification process, but it also prevents lead transfer to higher trophic levels of the marine food chain since the skeleton is not digested by higher consumers. In addition, the skeleton of asteroids can be regarded as a bioindicator of long-term dietary lead contamination.
Florence Boisson; Oliver Cotret; Scott W Fowler
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Marine pollution bulletin     Volume:  44     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-12-11     Completed Date:  2003-03-10     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  1003-9     Citation Subset:  IM    
International Atomic Energy Agency, Marine Environment Laboratory, 4 Quai Antoine Ier, BP 800, MC-98012 Monaco Cedex, Monaco.
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MeSH Terms
Calcium Carbonate
Food Chain*
Lead / pharmacokinetics*
Tissue Distribution
Water Pollutants / pharmacokinetics*
Reg. No./Substance:
0/Water Pollutants; 471-34-1/Calcium Carbonate; 7439-92-1/Lead

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

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