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Arctigenin Ameliorates Inflammation by Regulating Accumulation and Functional Activity of MDSCs in Endotoxin Shock

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Abstract

Endotoxin shock is a life-threatening response caused by a disordered immune response to an infection. MDSCs are accumulated and play a protective role in the pathogenesis of endotoxin shock. However, the regulation of MDSCs by small molecule remains unrevealed. Here, we report that arctigenin, a small molecule extracted from Arctium lappa, induces accumulation of functional MDSCs. Arctigenin was able to ameliorate LPS-induced inflammation through accumulating MDSCs, especially granulocytic MDSCs (G-MDSCs), and enhancing the immunosuppressive function of MDSCs in vivo and in vitro. Mechanistically, arctigenin promoted the accumulation of MDSCs through upregulating miR-127-5p which targets the 3′UTR of interferon regulatory factor-8 (IRF8) mRNA. In addition, arctigenin enhanced the immunosuppressive activity of MDSCs on M1 macrophage polarization by elevating the expression of arginase 1 (Arg-1) and inducible nitric oxide synthase (iNOS). Our study provides new insights into the regulation of functional MDSCs by arctigenin in exerting immune responses and pathogenesis of inflammatory diseases.

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Funding

This study was funded by the Shandong Provincial Natural Science Foundation, China (No. ZR2017BH057, No. ZR2017BH016); Projects of Science and Technology in Shandong Province, China (No. J17KA230); and Projects of Jining Medical University (JY2017KJ009).

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Correspondence to Huabao Xiong.

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The research was approved by the Jining University Institution Animal Care and Use Committee.

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The authors declare that they have no conflict of interest.

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Shi, H., Dong, G., Yan, F. et al. Arctigenin Ameliorates Inflammation by Regulating Accumulation and Functional Activity of MDSCs in Endotoxin Shock. Inflammation 41, 2090–2100 (2018). https://doi.org/10.1007/s10753-018-0852-1

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