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Artículo

Antioxidant levels from different Antarctic fish caught around South Georgia Island and Shag Rocks

Ansaldo, Martin; Luquet, Carlos MarceloIcon ; Evelson, Pablo AndrésIcon ; Polo, José M.; Llesuy, Susana FranciscaIcon
Fecha de publicación: 02/2000
Editorial: Springer
Revista: Polar Biology
ISSN: 0722-4060
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Antarctic fish have been isolated for over several million years in an environment with a very low and constant temperature and high oxygen concentration. In such conditions the oxidative stress might be an important factor affecting their metabolic adaptive strategies. Activity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx), vitamin E levels and total antioxidant capacity (TRAP) were measured in liver, gill, heart and muscle homogenates of red-blooded (Nototheniidae) and white-blooded (Channichthyidae) Antarctic fish. SOD activity was also measured in blood samples. Gill SOD activity was threefold higher in channichthyids than in nototheniids while CAT and GPx were significantly higher in the gills of channichthyids. The increased SOD activity of channichthyids probably reflects the large PO2 gradient across their gills. The H2O2 produced seems to be preferentially eliminated by diffusion, according to the low levels of CAT and GPx found in the gills of these species. In contrast, blood SOD was about fivefold higher in the latter group, which possesses erythrocytes and thus a much higher oxygen-carrying capacity. CAT activity was always higher in nototheniids except in muscle. However, vitamin E did not show clear differences between families except for the pattern observed in muscle. The higher content of vitamin E in this tissue shown in channichthyids is related to the higher volume density of mitochondria reported for this group, since vitamin E is responsible for preventing membrane lipid peroxidation. Accordingly, TRAP (representative of hydrosoluble antioxidant capacity) was also higher in muscle of channichthyids. This is probably related to the role of ascorbic (a hydrosoluble compound) acid in regenerating vitamin E.
Palabras clave: Antartic Fish , Antioxidants , Total Reactive Antioxidant Potential
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/39199
DOI: http://dx.doi.org/10.1007/s003000050022
URL: https://link.springer.com/article/10.1007/s003000050022
Colecciones
Articulos(IBIMOL)
Articulos de INSTITUTO DE BIOQUIMICA Y MEDICINA MOLECULAR
Citación
Ansaldo, Martin; Luquet, Carlos Marcelo; Evelson, Pablo Andrés; Polo, José M.; Llesuy, Susana Francisca; Antioxidant levels from different Antarctic fish caught around South Georgia Island and Shag Rocks; Springer; Polar Biology; 23; 3; 2-2000; 160-165
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