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Role of non-enzymatic antioxidants on the bivalves' adaptation to environmental mercury: Organ-specificities and age effect in Scrobicularia plana inhabiting a contaminated lagoon.
MedLine Citation:
PMID:  22265760     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study aimed to investigate the role of non-enzymatic antioxidants on adaptive skills over time in the bivalve Scrobicularia plana environmentally exposed to mercury. Inter-age (2(+), 3(+), 4(+), 5(+) year old) and organ-specific (gills, digestive gland) approaches were applied in bivalves collected from moderately and highly contaminated sites at Ria de Aveiro (Portugal). S. plana's adaptive skills were dependent on the contamination extent; under moderate contamination scenario, the intervention of the different antioxidants took place harmoniously, evidencing an adjustment capacity increasing with the age. Under higher contamination degree, S. plana failed to cope with mercury threat, showing an age-dependent deterioration of the defense abilities. In organ-specific approach, the differences were particularly evident for thiol-compounds, since only gills displayed the potential to respond to moderate levels by increasing non-protein thiols and total glutathione. Under high contamination degree, both organs were unable to increase thiol-compounds, which were compensated by the ascorbic acid elevation.
Authors:
I Ahmad; I Mohmood; J P Coelho; M Pacheco; M A Santos; A C Duarte; E Pereira
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-18
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  163C     ISSN:  1873-6424     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  -    
Other Details:
Languages:  ENG     Pagination:  218-225     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
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