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THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Zoology)
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Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus)|
E-ISSN 2090-0503 | ISSN 2090-0511
 

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Original Research 


Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus)

Zeinab Ibrahim Attia, Hala Mostafa Abdelazem, Iman Elsayed Nada.

Abstract
The effect of hypoxia and reoxygenation on Nile tilapia (Oreochromis niloticus) was studied. The fish were exposed to hypoxic oxygen concentrations (2 and 0.5 mg O2 L-1) for 1 day (short term) and 30 days (long term) followed by reoxygenation for 1 day and 7 days, respectively. The activities of superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST) significantly decreased in the gills of all the hypoxic groups after both short and long term of hypoxia exposures, while increased significantly below control levels after reoxygenation except that the activities of SOD and GST in the reoxygenated groups pre-exposed to short-term (2 mg O2 L-1), SOD activity in the reoxygenated group pre-exposed to long-term (0.5 mg O2 L-1), and the activities of CAT and GST in all the reoxygenated groups pre-exposed to long-term hypoxia, had no significant change compared to their respective hypoxic groups. The activities of glutathione peroxidase (GPx), glutathione reductase (GR) and xanthine oxidase (XO) significantly increased during hypoxia then decreased significantly after reoxygenation except for GPx activity in the reoxygenated group pre-exposed to short-term (2 mg O2 L-1). Malondialdehyde (MDA) concentrations significantly increased in all the hypoxic and reoxygenated groups compared to their respective controls. The significance of these alterations in enzyme activities and oxidative stress indices is discussed. In conclusion, hypoxia and subsequent reoxygenation induce oxidative stress in Oreochromis niloticus gills causing depletion of some antioxidant enzymes. Long-lasting oxidative stress can delay full recovery.

Key words: Antioxidant enzymes, gills, hypoxia, reoxygenation, Oreochromis niloticus.


 
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How to Cite this Article
Pubmed Style

ZIA, Abdelazem HM, Nada IE. Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). Egypt. J. Exp. Biol. (Zoo.). 2022; 18(2): 153-161. doi:10.5455/egysebz.20220907064204


Web Style

ZIA, Abdelazem HM, Nada IE. Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). https://www.egyseb.net/ejebz/?mno=112395 [Access: February 01, 2023]. doi:10.5455/egysebz.20220907064204


AMA (American Medical Association) Style

ZIA, Abdelazem HM, Nada IE. Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). Egypt. J. Exp. Biol. (Zoo.). 2022; 18(2): 153-161. doi:10.5455/egysebz.20220907064204



Vancouver/ICMJE Style

ZIA, Abdelazem HM, Nada IE. Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). Egypt. J. Exp. Biol. (Zoo.). (2022), [cited February 01, 2023]; 18(2): 153-161. doi:10.5455/egysebz.20220907064204



Harvard Style

, Z. I. A., Abdelazem, . H. M. & Nada, . I. E. (2022) Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). Egypt. J. Exp. Biol. (Zoo.), 18 (2), 153-161. doi:10.5455/egysebz.20220907064204



Turabian Style

, Zeinab Ibrahim Attia, Hala Mostafa Abdelazem, and Iman Elsayed Nada. 2022. Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Zoology), 18 (2), 153-161. doi:10.5455/egysebz.20220907064204



Chicago Style

, Zeinab Ibrahim Attia, Hala Mostafa Abdelazem, and Iman Elsayed Nada. "Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus)." THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Zoology) 18 (2022), 153-161. doi:10.5455/egysebz.20220907064204



MLA (The Modern Language Association) Style

, Zeinab Ibrahim Attia, Hala Mostafa Abdelazem, and Iman Elsayed Nada. "Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus)." THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Zoology) 18.2 (2022), 153-161. Print. doi:10.5455/egysebz.20220907064204



APA (American Psychological Association) Style

, Z. I. A., Abdelazem, . H. M. & Nada, . I. E. (2022) Effect of hypoxia and reoxygenation on antioxidant system in gills of tilapia fish (Oreochromis niloticus). THE EGYPTIAN JOURNAL OF EXPERIMENTAL BIOLOGY (Zoology), 18 (2), 153-161. doi:10.5455/egysebz.20220907064204