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Comp Biochem Physiol C Toxicol Pharmacol. 2018 Dec;214:17-22. doi: 10.1016/j.cbpc.2018.08.003. Epub 2018 Aug 24.

Inconsistent responses of liver mitochondria metabolism and standard metabolism in Silurus meridionalis when exposed to waterborne cadmium.

Author information

1
Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Ocean College, Qinzhou University, Qinzhou, China; Institute of Hydrobiology and Water Environment, School of Life Sciences, Southwest University, Chongqing, China. Electronic address: nefu@email.swu.edu.cn.
2
Institute of Hydrobiology and Water Environment, School of Life Sciences, Southwest University, Chongqing, China. Electronic address: xjxie@swu.edu.cn.

Abstract

We investigated the standard metabolic rate and liver mitochondria metabolism of the southern catfish when exposed to waterborne cadmium. Juvenile southern catfish were exposed to waterborne cadmium concentrations (0, 62.5, 125, 250 and 500 μg/L, respectively) for 8 weeks, and the final body mass, the standard metabolic rate, the state III respiration rate, the activity of cytochrome C oxidase (CCO) of liver mitochondria, and the hepatosomatic index (HSI) were determined. The results showed that the 62.5 μg/L, 125 μg/L, and 250 μg/L experiment groups had a significantly higher standard metabolic rate than that of the control group. Standard metabolic rate in the 500 μg/L experiment group did not differ from the control group. State III respiration rate of liver mitochondria decreased with an increase in cadmium concentration. The 125 μg/L, 250 μg/L, and 500 μg/L experiment groups had a significantly lower state III respiration rate than that of the control group. The activity of CCO in the 500 μg/L experiment group was significantly lower than that of the control group. These results suggest that at low cadmium concentrations, the southern catfish could continuously improve the standard metabolism to provide extra energy in response to the cadmium stress. Cadmium exposures caused damage to the structure and function of liver mitochondria and decreased the activity of mitochondria enzymes, which results in a decrease in the energy of the liver metabolism. The adjustment of the metabolism of liver mitochondria in southern catfish was inconsistent with the adjustment of individual standard metabolism.

KEYWORDS:

Metabolism adjustment; Mitochondria metabolism; Silurus meridionalis; Standard metabolism; Waterborne cadmium exposure

PMID:
30149079
DOI:
10.1016/j.cbpc.2018.08.003
[Indexed for MEDLINE]

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