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Selenium improved mitochondrial quality and energy supply in the liver of high-fat diet-fed grass carp (Ctenopharyngodon idella) after heat stress

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Abstract

This study aims to explore the effects of dietary selenium on hepatic mitochondrial quality and energy supply of grass carp (Ctenopharyngodon idella) fed with high-fat diet (HFD) after heat stress (HS). Grass carp were fed with HFD, and HFD contained 0.3 mg/kg nano-selenium for 10 weeks, thereafter exposed to HS from 26 to 34 °C, and named the HFD + HS (control) group and the HFD + Se + HS group, respectively. The results show that selenium significantly prompted the growth, increased glutathione peroxidase (GPX) activity, but reduced malondialdehyde (MDA) content in the liver and the levels of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) in the serum of grass carp fed with HFD after HS. Further, selenium alleviated mitochondrial damage and increased the number of mitochondrial DNA copies in the liver of the grass carp fed with HFD after HS. And selenium also maintained mitochondrial homeostasis by upregulating the expression of mitochondrial quality control-related genes (pgc-1α, nrf1/2, tfam, opa1, mfn1/2, and drp1), mitophagy-related genes (beclin1, atg5, atg12, pink1, and parkin), and the protein expression of parkin and LC3-II/I in the liver of grass carp. Finally, selenium reduced the triglyceride (TG) level and increased the free fatty acid (FFA) level and adenosine triphosphate (ATP) production in the liver of grass carp fed with HFD after HS. In conclusion, dietary selenium alleviated liver damage and improved liver mitochondrial quality and ATP production by increasing liver antioxidant capacity and promoting liver mitochondrial quality in grass carp fed with HFD after HS, which help grass carp to resist these two stressors.

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The datasets generated during and/or analyzed during the current study are not publicly available but are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Key Research and Development Program of China (Project No. 2019YFD0901002), the Northwest A&F University Young Talent Training Program (2452018030), and the National Natural Science Foundation of China (31602180).

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Xiaotian Zhang, methodology, investigation, data curation, writing original draft, formal analysis; Haibo Yu, conceptualization, methodology, resources, supervision, project administration, funding acquisition, writing—review and editing; Xianfang Yan, methodology, investigation, and data curation; Pengju Li, methodology, investigation, and data curation; Chi Wang, investigation; Cheng Zhang, investigation; Hong Ji, resources; Qinfeng Gao, resources; Shuanglin Dong, resources.

Corresponding author

Correspondence to Haibo Yu.

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The experiment procedures were conducted in compliance with the Guidelines for Animal Research which was approved by the Animal Care Committee of Northwest A&F University, Yangling, China (Permit number: DKXT20210308).

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The authors declare no competing interests.

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Zhang, X., Yu, H., Yan, X. et al. Selenium improved mitochondrial quality and energy supply in the liver of high-fat diet-fed grass carp (Ctenopharyngodon idella) after heat stress. Fish Physiol Biochem 48, 1701–1716 (2022). https://doi.org/10.1007/s10695-022-01140-x

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  • DOI: https://doi.org/10.1007/s10695-022-01140-x

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