Abstract
Copper (Cu) is an essential micronutrient for both humans and animals; however, excessive intake of Cu can be immunotoxic. There are limited studies on spleen toxicity induced by Cu. This study was conducted to investigate the effects of Cu on spleen oxidative stress, apoptosis, and inflammatory responses in mice orally administered with 0 mg/kg, 10 mg/kg, 20 mg/kg, and 40 mg/kg of CuSO4 for 42 days. As discovered in this work, copper sulfate (CuSO4) reduced the activities of antioxidant enzymes (SOD, CAT, and GSH-Px), decreased GSH contents, and increased MDA contents. Meanwhile, CuSO4 induced apoptosis by increasing TUNEL-positive cells in the spleen. Also, CuSO4 increased the expression of γ-H2AX, which is the marker of DNA damage. Concurrently, CuSO4 caused inflammation by increasing the mRNA levels of interleukin-1β (IL-1β), IL-2, IL-4, IL-6, IL-12, tumor necrosis factor-α (TNF-α), and interferon-γ (IFN-γ). In conclusion, the abovementioned findings demonstrate that over 10 mg/kg CuSO4 can cause oxidative stress, apoptosis, DNA damage, and inflammatory responses, which contribute to spleen dysfunction in mice.
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This research was supported by the program for Changjiang scholars and the university innovative research team (IRT 0848), the Shuangzhi project of Sichuan Agricultural University (03573050; 1921993267), and Sichuan Science and Technology Program (2020YJ0113).
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Hongrui Guo and Hengmin Cui designed research and wrote the paper; Huidan Deng performed research and wrote the paper; Yuqin Wang, Yujuan Ouyang, Tingyou Yang, Caiyun Liu, Xiaoyu Liu, and Yanqiu Zhu performed research analyzed data.
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The protocol for animal experiments was ethically approved by the Animal Care and Use Committee, Sichuan Agricultural University.
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Guo, H., Wang, Y., Cui, H. et al. Copper Induces Spleen Damage Through Modulation of Oxidative Stress, Apoptosis, DNA Damage, and Inflammation. Biol Trace Elem Res 200, 669–677 (2022). https://doi.org/10.1007/s12011-021-02672-8
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DOI: https://doi.org/10.1007/s12011-021-02672-8