Abstract
Selenium deficiency can affect the level of selenoprotein in organs and tissues and cause inflammation. However, the mechanism of selenium deficiency on jejunal injury in chickens remains unclear. In this study, we established a selenium deficiency model in chickens by feeding a low selenium diet and observed ultrastructural and pathological changes in the jejunum. The expression levels of 25 selenoproteins, the levels of oxidative stress, tight junction (TJ) proteins, and antimicrobial peptides (AMP), as well as the expression levels of factors related to inflammatory signaling pathways, were examined in the intestine and analyzed using principal component analysis (PCA). The results of PCA and quantitative real-time PCR (qRT-PCR) showed that selenium deficiency mainly affected the expression of antioxidant selenoproteins in chicken jejunum, especially glutathione peroxidases, thioredoxin reductase, and iodothyronine deiodinase, thus weakening the antioxidant function in the intestine and inducing oxidative stress. We also found disruption of intestinal TJ structures, a significant reduction in TJ protein expression, and downregulation of antimicrobial peptide levels, suggesting that selenium deficiency led to damage of the intestinal barrier. In addition, a significant increase in inflammatory cell infiltration and expression of inflammatory factors was observed in the jejunum, indicating that selenium deficiency induces inflammatory injury. In conclusion, selenium deficiency downregulates antioxidant selenoproteins levels, induces oxidative stress, decreases intestinal AMP levels, and leads to inflammatory injury and disruption of the intestinal barrier in the jejunum. These results shed new light on the molecular mechanisms of intestinal damage caused by selenium deficiency.
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Acknowledgements
The authors thank the Key Laboratory of the Provincial Education Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural University, for providing conditions.
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This work was supported by the National Natural Science Foundation of China (grant No. 32072811, 31872437).
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All authors contributed to the study conception and design. Material preparation, experiments, and data generation were performed by He Yujiao. Data collection and analysis were performed by Peng Lin. Data curation was performed by Zhao Xiaochun, Fan Xue, and Tang Xinyu. Project administration was performed by Shi Guangliang and Li Shu. The first draft of the manuscript was written by Peng Lin and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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He Yujiao and Peng Lin contributed equally to this work and should be considered co-first authors.
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He, Y., Peng, L., Zhao, X. et al. Selenium Deficiency Induces Inflammatory Response and Decreased Antimicrobial Peptide Expression in Chicken Jejunum Through Oxidative Stress. Biol Trace Elem Res 201, 3461–3473 (2023). https://doi.org/10.1007/s12011-022-03442-w
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DOI: https://doi.org/10.1007/s12011-022-03442-w