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The protective effects of taurine on oxidative stress, cytoplasmic free-Ca 2+ and apoptosis of pufferfish (Takifugu obscurus) under low temperature stress.
Fish & Shellfish Immunology 2018 June
The present study was aimed to investigate the low temperature toxicity and its protection by taurine in pufferfish. The experimental basal diets supplemented with taurine at the rates of 250 (control), 550, 850, 1140, 1430, 1740 mg kg-1 were fed to fish for 8 weeks. The results showed that fish fed diet with taurine had significantly improved weight gain and specific growth rate. After the feeding trial, the fish were then exposed to low temperature stress. The results showed that low temperature stress could induce reactive oxygen species (ROS) generation, disturb the cytoplasm Ca2+ homeostasis, and lead to oxidative stress and apoptosis. Compared with the control group, dietary taurine supplementation groups increased antioxidant enzyme genes such as manganese superoxide dismutase (Mn-SOD), glutathione peroxidase (GPx), glutathione reductase (GR) and catalase (CAT), heat shock proteins (HSP70) and complement C3 (C3) mRNA levels under low temperature stress. Meanwhile, dietary taurine supplementation groups reduced ROS generation, and stabilized the cytoplasm Ca2+ under low temperature stress. Furthermore, dietary taurine supplementation groups reduced apoptosis via decreasing caspase-3 activity. This is the first report to demonstrate the mechanisms of taurine against low temperature stress in fish.
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