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The Decrease of Relative Weight, Lesions, and Apoptosis of Bursa of Fabricius Induced by Excess Dietary Selenium in Chickens

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Abstract

Selenium is an essential trace element possessing immune-stimulatory properties. The purpose of this 42-day study was to investigate the effects of excess dietary sodium selenite on immune function by determining morphological changes and apoptosis of bursa of Fabricius. Three hundred 1-day-old Avian broilers were fed on a basic diet (0.2 ppm selenium) or the same diet amended to contain 1, 5, 10, and 15 ppm selenium supplied as sodium selenite (n = 60/group). Relative weight of bursa was significantly decreased in the 1, 5, 10, and 15 ppm groups at 28 days of age, when compared with that of 0.2 ppm group. Pathological lesions were progressed with the dietary Se level increased. The gross lesions of bursa involved obvious atrophy with decreased volume and pale color. Histopathologically, decreased number of lymphocytes and loosely packed lymphocytes appeared in the medulla and cortex in the follicles. Ultrastructurally, mitochondria injury and increased apoptotic cells with condensed nuclei were observed. In comparison to that of control group, excess Se (5, 10, and 15 ppm) intake increased the percentage of Annexin V positive cells, as measured by flow cytometry. Terminal deoxynucleotidyl transferase 2′-deoxyuridine 5′-triphosphate nick end-labeling assay showed that there were increased frequencies of apoptotic cells in 10 and 15 ppm selenium groups. These data suggest that Se supplementation with sodium selenite should be carefully evaluated as excess selenium (more than 5 ppm) intake could cause profound immunologic inhibition.

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Acknowledgments

This work was supported by the Education Department and Scientific Department of Sichuan Province (2006A007) and Program for Changing Scholars and Innovative Research Team in University (PCSIRT 0835).

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Authors and Affiliations

  1. College of Veterinary Medicine, Sichuan Agricultural University, Yaan, Sichuan, 625014, China

    Xi Peng, Yun Cui, Wei Cui, Junliang Deng & Hengmin Cui

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  1. Xi Peng
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  2. Yun Cui
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  3. Wei Cui
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Correspondence to Hengmin Cui.

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Peng, X., Cui, Y., Cui, W. et al. The Decrease of Relative Weight, Lesions, and Apoptosis of Bursa of Fabricius Induced by Excess Dietary Selenium in Chickens. Biol Trace Elem Res 131, 33–42 (2009). https://doi.org/10.1007/s12011-009-8345-6

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  • DOI: https://doi.org/10.1007/s12011-009-8345-6

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