Document Detail

Colour and melanophore function in rainbow trout after long term exposure to the new antifoulant medetomidine.
MedLine Citation:
PMID:  20538317     Owner:  NLM     Status:  MEDLINE    
Medetomidine is a new antifouling agent, and its effects in non-target aquatic organisms have been investigated. Earlier short-term studies in fish have shown a skin lightening response to medetomidine, but effects after chronic exposure have not been studied. In fish, the dark pigment melanin is contained within specialized cells, melanophores. Medetomidine binds to the melanophore alpha2-adrenoceptor, which stimulates pigment aggregation resulting in the light appearance. In the present study, rainbow trout (Oncorhynchus mykiss) was long-term exposed to 0.5 and 5.0 nM of medetomidine via water for 54 d. The fish were then photographed for paleness quantification and the images were analyzed using ImageJ analysis software. Additionally, scales were removed and used for in vitro function studies of the melanophores, monitoring the response to melanophore stimulating hormone (MSH) and subsequent medetomidine addition. The number of melanophores was also investigated. As a result of the medetomidine exposure, fish from the 5 nM treatment were significantly paler than control fish and the melanophores from these fishes were also more aggregated. Melanophores from all the treatments were functional, responding to MSH by dispersion and to subsequent medetomidine by aggregation. However, the results indicate a difference in sensitivity among treatments. The number of melanophores in the scales did not change significantly after long term exposure to medetomidine. These results suggest that the observed paleness may be reversible, even after chronic exposure.
Anna Lennquist; Lena G E Mårtensson Lindblad; Daniel Hedberg; Erik Kristiansson; Lars Förlin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-09
Journal Detail:
Title:  Chemosphere     Volume:  80     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-02     Completed Date:  2010-11-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1050-5     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Elsevier Ltd. All rights reserved.
Department of Zoology/Zoophysiology, University of Gothenburg, Sweden.
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MeSH Terms
Adrenergic alpha-Agonists / toxicity*
Environmental Exposure
Medetomidine / toxicity*
Melanocyte-Stimulating Hormones / metabolism
Melanophores / physiology*
Oncorhynchus mykiss / metabolism*
Skin Pigmentation
Time Factors
Water Pollutants, Chemical / toxicity*
Reg. No./Substance:
0/Adrenergic alpha-Agonists; 0/Water Pollutants, Chemical; 86347-14-0/Medetomidine; 9002-79-3/Melanocyte-Stimulating Hormones

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