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Volume 15, Issue 3 - September 2015

 

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Revista de Gestão Costeira Integrada
Volume 15, Número 3, Setembro 2015, Páginas 371-376

DOI: 10.5894/rgci594
* Submission: 13 MAR 2015; Peer review: 16 APR 2015; Revised: 29 APR 2015; Accepted: 5 MAY 2015; Available on-line: 6 MAY 2015


Biomarkers responses in different body regions of the polychaeta Hediste diversicolor (Nereidae, Polychaete) exposed to copper *  

Z. Bouraoui@,a; J. Ghediraa; H. Boussettaa


@ Corresponding author, to whom correspondence should be addressed: <[email protected]>
a University of Sousse, Laboratory of Biochemistry and Environmental Toxicology, I.S.A. Chott-Mariem, 4042, Tunisia. Phone: 00 216 73 327 544. Fax: 00 216 73 327 591   


ABSTRACT
This study aims to evaluate the effects of exposure to 1 μM of copper during a period of test of 48 h, on enzymatic and lipid peroxidation biomarkers in anterior (A), middle (M) and posterior (P) body regions of the polychaeta (Nereididae) Hediste diversicolor. The biomarkers selected in this work were the NADPH cytochrome c reductase (NADPH red) as phase I biotransformation enzyme, glutathione-S-transferase (GST) as phase II enzyme, and the oxidative stress markers using catalase activity (CAT) and malondialdehyde accumulation (MDA). The NADPH red activity was not significantly affected by copper exposure in the different body regions. Glutathione-S-transferase (GST) was significantly augmented (p< 0.05) only in the A region of Cu group compared to control group. The higher and significant CAT activity (p< 0.05) was noted in the P region of treated group paralleled by a lack of MDA production in the same region. A higher MDA content was observed in A region compared with the same body region of treated worm supporting the idea of a highest oxidant condition in this region. 

Keywords: Copper, NADPH cytochrome c reductase,  glutathione-S-transferase, catalase, Hediste diversicolor.


Resposta de Biomarcadores em Hediste diversicolor (Nereidae, Polychaete): Efeitos da exposição ao Cobre

RESUMO
Com este trabalho pretende-se estudar a exposição ao cobre (1 μM) em testes de 48 h, com biomarcadores enzimáticos e de peroxidação lipídica nas regiões corporais anterior (A), mediana (M) e posterior (P) no poliqueta (Nereididae) Hediste diversicolor. Os biomarcadores selecionados para este estudo foram NADPH cytochrome c reductase (NADPH red) como enzimas biotransformadoras nas reações de fase I, glutathione-S-transferase (GST) como enzima da fase II, e os marcadores do stress oxidativo usando a atividade da enzima antioxidante catalase (CAT) e a acumulação de malondialdehyde (MDA). A atividade do NADPH não foi significativamente afetada pela exposição ao cobre nas diferentes regiões do corpo do poliqueta. Glutathione- S-transferase (GST) aumentou significativamente (p< 0.05) na região A comparativamente com o grupo controle. A maior e significativa atividade de CAT (p< 0.05) foi registada na região P paralelamente à ausência de produção de MDA nessa mesma região. Maiores concentrações de MDA foram registadas na região A evidenciando uma maior condição de stress oxidativo nessa região.   

Palavras-chave: Cobre, NADPH cytochrome c reductase, glutathione-S-transferase, catalase, Hediste diversicolor

 

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