摘要
Objective To investigate the hispathological characteristics and antioxidant responses in liver of silver carp after intraperitoneal administration of microcystins （MCs） for further understanding hepatic intoxication and antioxidation mechanism in fish. Methods Phytoplanktivorous silver carp was injected intraperitoneally （i.p.） with extracted hepatotoxic microcystins （mainly MC-RR and -LR） at a dose of 1000 μg MC-LReq./kg body weight, and liver histopathological changes and antioxidant responses were studied at 1, 3, 12, 24, and 48 h, respectively, after injection. Results The damage to liver structure and the activities of hepatic antioxidant enzymes including catalase （CAT）, superoxide dismutase （SOD）, and glutathione peroxide （GPX） were increased in a time-dependent manner. Conclusion In terms of clinical and histological signs of intoxication and LD50 （i.p.） dose of MC-LR, silver carp appears rather resistant to MCs exposure than other fishes. Also the significantly increased SOD activity in the liver of silver carp suggests a higher degree of response to MCs exposure than CAT and GPX.
Objective To investigate the hispathological characteristics and antioxidant responses in liver of silver carp after intraperitoneal administration of microcystins （MCs） for further understanding hepatic intoxication and antioxidation mechanism in fish. Methods Phytoplanktivorous silver carp was injected intraperitoneally （i.p.） with extracted hepatotoxic microcystins （mainly MC-RR and -LR） at a dose of 1000 μg MC-LReq./kg body weight, and liver histopathological changes and antioxidant responses were studied at 1, 3, 12, 24, and 48 h, respectively, after injection. Results The damage to liver structure and the activities of hepatic antioxidant enzymes including catalase （CAT）, superoxide dismutase （SOD）, and glutathione peroxide （GPX） were increased in a time-dependent manner. Conclusion In terms of clinical and histological signs of intoxication and LD50 （i.p.） dose of MC-LR, silver carp appears rather resistant to MCs exposure than other fishes. Also the significantly increased SOD activity in the liver of silver carp suggests a higher degree of response to MCs exposure than CAT and GPX.
基金
supported by the Key Project of CAS titled "The effects of regenerative organic pollutant microcystins on the safety of aquatic food"
the National Natural Science Foundation of China (No. 30700077)
