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Title: Oxidative stress response in gill and liver of Liza saliens, from the Esmoriz-Paramos coastal lagoon, Portugal
Authors: Fernandes, Conceição
Fontaínhas-Fernandes, A.
Ferreira, M.
Salgado, Maria Antónia
Issue Date: 2008
Publisher: Springer Science
Citation: Fernandes, Conceição; Fontaínhas-Fernandes, A.; Ferreira, M.; Salgado, M.A. (2008) - Oxidative stress response in gill and liver of Liza saliens, from the Esmoriz-Paramos coastal lagoon, Portugal. Archives Environmental, Contamination and Toxicology. ISSN 0090-4341. 55:2, p. 262-269
Abstract: Tissue-specific responses against oxidative stress and lipid peroxidation were analyzed in wild adult mullet (Liza saliens) caught in the Portuguese coastal lagoon Esmoriz-Paramos. Parameters measured were catalase (CAT), superoxide dismutase (SOD), and glutathione- S-transferase (GST) activities in liver and gill tissues and lipid peroxidation. The enzyme activities were related to gill histopathological alterations, as well as to heavy metals (Cu and Zn) concentrations in these tissues. Gill epithelium of L. saliens showed histological alterations, such as epithelial hyperplasia resulting in lamellar fusion, epithelial lifting, vasodilatation, and lamellar aneurisms, with a prevalence ranging from 62% to 92%. The highest Cu content was found in liver (379 mg kg-1), while the highest Zn content was observed in gill (119 mg kg-1). SOD and CAT activities showed differences between gill and liver. The highest activities found were SOD in gill (10.1 U/mg protein) and CAT in liver (39.2 mmol/min/mg protein). In gill, CAT activity was negatively related to both Cu levels and gill lifting, while a positive relationship was found between SOD activity and fish age. The positive relationship between Cu and CAT activity in liver suggests that an increase in metabolic level is related to Cu-induced oxidative stress. The decrease in gill CAT activity can be due to osmotic stress caused by damaged gill epithelium. CAT activity in liver is an appropriate biomarker of oxidative stress in the Esmoriz-Paramos lagoon.
Peer review: yes
ISSN: 0090-4341
Appears in Collections:PTV - Artigos em Revistas Indexados ao ISI/Scopus

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