Peroxiredoxin IV Regulates Pro-Inflammatory Responses in Large Yellow Croaker (Pseudosciaena crocea) and Protects against Bacterial Challenge

文献类型： 外文期刊

第一作者： Yu, Suhong

作者： Yu, Suhong;Mu, Yinnan;Ao, Jingqun;Chen, Xinhua;Yu, Suhong

作者机构：

关键词： large yellow croaker (Pseudosciaena crocea);proteomics;peroxiredoxin;IV;NF-kappa B activation;pro-inflammatory response;antibacterilal;immunity;siRNA

期刊名称：JOURNAL OF PROTEOME RESEARCH （ 影响因子：4.466； 五年影响因子：4.352 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In this study, we applied a comparative proteomic approach to the analysis of differentially expressed proteins in the spleens of large yellow croaker following treatment with an inactivated trivalent bacterial vaccine. Twenty-four altered proteins were identified by MALDI-TOF or MALDI-TOF-TOF, including immune-related proteins, antioxidant proteins, signal transducers, protein biosynthesis and catabolism modulators, and carbonic anhydrases. Three Prx family members, namely, Prx I, Prx II, and Prx IV, were upregulated after treatment with the vaccine, indicating potentially important roles for these antioxidant proteins in the antibacterial immune response. Large yellow croaker Prx IV (LycPrxIV), which has thiol-dependent peroxidase activity, was constitutively expressed in all tissues examined. Immunoelectron microscopy showed that LycPrxIV was primarily localized to the rER or peroxisome in spleen cells of healthy fish, and its synthesis on the rER increased following treatment with bacterial vaccine. Suppression of LycPrxIV by siRNA resulted in an increase in NF-kappa B activity in spleen tissues, while in vivo administration of recombinant LycPrxIV (rLycPrxIV) caused a decrease in NF-kappa B activity, indicating that LycPrxIV negatively regulates NF-kappa B activation. Likewise, siRNA-mediated knockdown of LycPrxIV increased the expression of TNF-alpha and CC chemokine, and downregulated the expression of IL-10. However, injection of fish with rLycPrxIV induced the opposite expression pattern of these cytokines, suggesting a role for LycPrxIV in regulating pro-inflammatory responses. Bacterial challenge experiments showed that suppression of LycPrxIV expression by siRNA significantly increased fish mortality as compared to controls, whereas rLycPrxIV provided a protective effect. Together, our data suggest that LycPrxIV may regulate pro-inflammatory responses to protect large yellow croaker from bacterial challenge, revealing a novel antibacterial mechanism in fish.

分类号： Q7

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