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The peptide lycosin-I attenuates TNF-α-induced inflammation in human umbilical vein endothelial cells via IκB/NF-κB signaling pathway

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Abstract

Objective

The peptide lycosin-I has anti-bacterial and anti-cancer capacities. However, the anti-inflammatory activity of lycosin-I remains unknown. We investigated whether lycosin-I could attenuate inflammation.

Materials and methods

Human umbilical vein endothelial cells (HUVECs) were treated with lycosin-I before exposure to tumor necrosis factor-α (TNF-α). The expression of intercellular cell adhesion molecule-1 (ICAM-1), nuclear transcription factor-kappa B (NF-κB) p65 and inhibitory subunit of NF-κB alpha (IκBα) was evaluated by western blot. The expression of interleukin-6 (IL-6) and interleukin-8 (IL-8) was detected by quantitative RT-PCR or ELISA. Immunofluorescence analysis was used to determine the impact of lycosin-I on NF-κB pathway. C57BL/6 mice were pretreated with lycosin-I before exposure with lipopolysaccharide (LPS).

Results

Lycosin-I significantly reduced the TNF-α-enhanced expression of IL-6, IL-8 and ICAM-1. Lycosin-I also inhibited the human monocyte cells adhesion to HUVECs. We further demonstrated that lycosin-I could effectively suppress the reaction of endothelial cells to TNF-α by inhibiting IκBα degradation. Subsequently, the phosphorylation and translocation of NF-κB p65 could also be attenuated. Furthermore, lycosin-I exhibited a significant protection of C57BL/6 mice against LPS-induced death.

Conclusions

Our results suggested that the anti-inflammatory activity of lycosin-I was associated with NF-κB activation and lycosin-I had potential to be a novel therapeutic candidate for inflammatory diseases.

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Acknowledgements

This project was supported by the Natural Science Foundation of Hunan Province (2015JJ2192 and 2017JJ2372), China Postdoctoral Science Foundation (2015M580704), Scientific Research Foundation of Central South University (2014JSJJ027), the National Natural Science Foundation of China (30901874 and 31672290) and National Undergraduate Innovation Training Program of Central South University (201510533321 and 201610533535). The authors are grateful to Dr. Songping, Liang and Zhonghua Liu, Hunan Normal University, for providing professional advice.

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Correspondence to Alex F. Chen or Liping Jiang.

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Communicated by Bernhard Gibbs.

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Li, X., Tang, Y., Ma, B. et al. The peptide lycosin-I attenuates TNF-α-induced inflammation in human umbilical vein endothelial cells via IκB/NF-κB signaling pathway. Inflamm. Res. 67, 455–466 (2018). https://doi.org/10.1007/s00011-018-1138-7

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