Abstract
Copper (Cu) is listed as one of the main heavy metal pollutants, which poses potential health risks to humans. Excessive intake of Cu has shown toxic effects on the organs of many animals, and the liver is one of the most important organs to metabolize it. In this study, pigs, the mammal with similar metabolic characteristics to humans, were selected to assess the effects of long-term exposure to Cu on mitochondria-mediated apoptosis, which are of great significance for studying the toxicity of Cu to humans. Pigs were fed a diet with different contents of Cu (10, 125, and 250 mg/kg) for 80 days. Samples of blood and liver tissue were collected on days 40 and 80. Experimental results demonstrated that the accumulation of Cu in the liver was increased in a dose-dependent and time-dependent manner. Meanwhile, the curve of pig’s body weight showed that a 125 mg/kg Cu diet promoted the growth of pigs during the first 40 days and then inhibited it from 40 to 80 days, while the 250 mg/kg Cu diet inhibited the growth of pigs during 80 days of feeding. Additionally, the genes and protein expression levels of Caspase-3, p53, Bax, Bak1, Bid, Bad, CytC, and Drp1 in the treatment group were higher than that in the control group, while Bcl-2, Bcl-xL, Opa1, Mfn1, and Mfn2 were decreased. In conclusion, these results indicated that long-term excessive intake of Cu could inhibit the growth of pigs and induced mitochondria-mediated apoptosis by breaking the mitochondrial dynamic balance.
Graphical abstract
Synopsis: Long-term exposure to high doses of Cu could lead to mitochondrial dysfunction by breaking the mitochondrial dynamic balance, which ultimately induced mitochondria-mediated apoptosis in the liver of pigs. This might be closely related to the growth inhibition and liver damage in pigs.
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Funding
This study was supported by the National Natural Science Foundation of China (No. 32072930 and 31572585) and the National Key R & D Program of China (No. 2016YFD0501205 and 2017YFD0502200).
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Zhaoxin Tang: conceptualization; methodology; supervision; project administration; funding acquisition. Zhuoying Hu: conceptualization; methodology; formal analysis; investigation; visualization; writing — original draft. Jianzhao Liao: data curation; formal analysis; investigation; writing — review and editing. Kai Zhang: data curation; formal analysis; software; methodology. Kunxuan Huang: investigation; writing — review and editing. Quanwei Li: supervision. Chaiqin Lei: writing — review and editing. Qingyue Han: investigation. Hui Zhang: visualization. Jianying Guo: methodology. Lianmei Hu: writing — review and editing; resources. Jiaqiang Pan: methodology. Ying Li: resources.
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Zhuoying Hu and Jianzhao Liao share the first authorship
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Hu, Z., Liao, J., Zhang, K. et al. Effects of Long-Term Exposure to Copper on Mitochondria-Mediated Apoptosis in Pig Liver. Biol Trace Elem Res 201, 1726–1739 (2023). https://doi.org/10.1007/s12011-022-03303-6
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DOI: https://doi.org/10.1007/s12011-022-03303-6