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Shuang, Liang; Chen, Song-Lin; Ren, Chao; Su, Xiao-Lei; Xu, Xiao-Na; Zheng, Guo-Dong; Zou, Shu-Ming
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, April 2023, 2023-04-00, 20230401, Letnik: 278Journal Article
A new hypoxia-tolerant variety of blunt snout bream was obtained by successive breeding of the wild population, which markedly improved hypoxia tolerance. In this study, the hypoxia-tolerant variety was exposed to hypoxia (2.0 mg O2·L−1) for 4, 7 days. The contents of blood biochemical indicators including the number of red blood cells (RBC), total cholesterol (T-CHO), total protein (TP), triglyceride (TG), glucose (GLU), and lactic acid (LD) increased significantly (P < 0.05) under hypoxia. The glycogen content in the liver and muscle decreased significantly (P < 0.05) and the LD content in the brain, muscle and liver increased significantly (P < 0.05) under hypoxia. The levels of oxidative stress-related indicators i.e., superoxide dismutase (SOD), malondialdehyde (MDA), glutathione (GSH), catalase (CAT), and total antioxidant capacity (T-AOC) also changed significantly (P < 0.05) in the heart, liver, and intestine of the new variety under hypoxia. Additionally, hypoxia has caused injuries to the heart, liver, and intestine, but it shows amazing repair ability during reoxygenation. The apoptotic cells and apoptosis rate in the heart, liver, and intestine increased under hypoxia. Under hypoxia, the expression of the B-cell lymphomas 2 (Bcl-2) gene in the heart, liver, and intestine was significantly (P < 0.05) down-regulated, while the expression of the BCL2-associated agonist of cell death (Bad) gene was significantly (P < 0.05) up-regulated. These results are of great significance for enriching the basic data of blunt snout bream new variety in response to hypoxia and promoting the healthy development of its culture industry. Display omitted •It provides some new insights into the hypoxia-tolerance of blunt snout bream new variety under hypoxia.•The results from this study will inspire future studies on tissue damage and repair of fish under hypoxia/reoxygenation.•The expression of Bcl-2 and Bad genes involved in apoptosis of blunt snout bream new variety under hypoxia was analyzed.•The oxidative stress, histological structure, and apoptosis of blunt snout bream under hypoxia were comprehensively analyzed.
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