Document Detail


Dynamic changes of α-hexachlorocyclohexane and its enantiomers in various tissues of Japanese Rabbits (Oyctolagus cuniculus) after oral or dermal exposure.
MedLine Citation:
PMID:  20843539     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Japanese Rabbits (Oyctolagus cuniculus) were exposed to α-hexachlorocyclohexane (α-HCH) either orally or dermally and concentrations of α-HCH and its two enantiomers were measured at different time intervals in the blood, intestine, liver, kidney, fat, brain, and muscle. The time trends were quantified using toxicokinetic models. It was found that absorption and elimination of α-HCH in blood were first-order processes which can be characterized by a single compartmental kinetic model. The absorption of dermally exposed α-HCH in blood was more than one order of magnitude faster than that of orally exposed α-HCH. The transport of α-HCH from the blood to other tissues was characterized using a two-compartment model. The accumulation rates were different among tissues depending on blood flow rate and fat content. Significant correlation was revealed between α-HCH concentration and fat content for various tissues either before or 1 d after the exposure. However, there was no such correlation at 10 min immediately after the exposure. The enantiomeric fraction (EF) of α-HCH in rabbit blood was nearly racemic before the exposure and increased to 0.73 and 0.82 after oral or dermal exposure, respectively. The result of a toxicokinetic modeling suggested that the strong enantioenrichment of (+)-α-HCH was primarily because the elimination rate of (-)-α-HCH was more than two times higher than that of (+)-α-HCH. The EFs for other tissues also increased dramatically after the exposure and the EFs in brain reached as high as 0.99 due to enantioselective transport across the blood brain barrier.
Authors:
Miao Xue; Guofeng Shen; Jialing Yu; Diyu Zhang; Zhijiang Lu; Bin Wang; Yan Lu; Jun Cao; Shu Tao
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2010-09-16
Journal Detail:
Title:  Chemosphere     Volume:  81     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-15     Completed Date:  2010-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1486-91     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Affiliation:
Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
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MeSH Terms
Descriptor/Qualifier:
Administration, Cutaneous
Administration, Oral
Animals
Isomerism
Lindane / administration & dosage,  chemistry,  pharmacokinetics*
Male
Pesticides / blood,  chemistry,  pharmacokinetics*
Rabbits
Tissue Distribution
Grant Support
ID/Acronym/Agency:
P42 ES016465/ES/NIEHS NIH HHS
Chemical
Reg. No./Substance:
0/Pesticides; 319-84-6/alpha-hexachlorocyclohexane; 58-89-9/Lindane

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


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