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Zinc Suppressed the Airway Inflammation in Asthmatic Rats: Effects of Zinc on Generation of Eotaxin, MCP-1, IL-8, IL-4, and IFN-γ

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Abstract

Airway epithelium is rich in labile zinc (Zn), which may have an important protective role in the airway epithelium. The aim of this study is to investigate the effects of Zn on the airway inflammation and the generation of eotaxin, monocyte chemoattractant protein-1 (MCP-1), interleukin-8 (IL-8), interleukin-4 (IL-4), and interferon-γ (IFN-γ) in rat models of ovalbumin (OVA)-induced allergic airway inflammation. For this purpose, animal model of asthma was established by OVA challenge and zinc-deficient and zinc-supplemented diets were given. Thirty-two Sprague–Dawley rats were divided into four groups: zinc-deficient diet with OVA treatment group, zinc-supplemented diet with OVA treatment group, zinc-normal diet with OVA treatment group, and zinc-normal diet with saline treatment group. Twenty-four hours after asthma was induced, lung histomorphological changes, cells in bronchoalveolar lavage fluid (BALF), contents of eotaxin, MCP-1, and IL-8 in BALF, and the expression of IFN-γ and IL-4 mRNAs were observed. Compared with the group of zinc-normal diet with OVA challenge rats, the group of zinc-deficient rats had higher numbers of eosinophils, neutrophils, and monocytes in BALF, as well as higher contents of eotaxin and MCP-1 in BALF and lower expression of lung IFN-γ mRNA. Conversely, Zn supplementation would decrease the numbers of eosinophils, neutrophils, and monocytes in BALF; suppress eotaxin and MCP-1 protein secretion; and increase lung IFN-γ mRNA expression. No significant difference was observed in IL-8 and IL-4 among OVA-challenged rats with different zinc diets. These studies suggested that Zn may be an important anti-inflammatory mediator of airway inflammation.

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Acknowledgments

This research was supported by Natural Science Foundation of Jiangsu Province, China (BK2011485), the Social Development Foundation of Zhenjiang, China (SH2011022).

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Authors and Affiliations

  1. Department of Pediatrics, The Affiliated Hospital of Jiangsu University, Zhenjiang, 212001, China

    Hongyan Lu, Yue Xin & Yan Tang

  2. Department of Cell Biology, School of Medicine, Jiangsu University, Zhenjiang, 212013, China

    Genbao Shao

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  1. Hongyan Lu
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  2. Yue Xin
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  3. Yan Tang
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Correspondence to Hongyan Lu.

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Lu, H., Xin, Y., Tang, Y. et al. Zinc Suppressed the Airway Inflammation in Asthmatic Rats: Effects of Zinc on Generation of Eotaxin, MCP-1, IL-8, IL-4, and IFN-γ. Biol Trace Elem Res 150, 314–321 (2012). https://doi.org/10.1007/s12011-012-9493-7

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  • DOI: https://doi.org/10.1007/s12011-012-9493-7

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