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Inflammation

, Volume 40, Issue 1, pp 1–12 | Cite as

Indirubin Inhibits LPS-Induced Inflammation via TLR4 Abrogation Mediated by the NF-kB and MAPK Signaling Pathways

  • Jin-lun Lai
  • Yu-hui Liu
  • Chang Liu
  • Ming-pu Qi
  • Rui-ning Liu
  • Xi-fang Zhu
  • Qiu-ge Zhou
  • Ying-yu Chen
  • Ai-zhen GuoEmail author
  • Chang-min HuEmail author
ORIGINAL ARTICLE

Abstract

Indirubin plays an important role in the treatment of many chronic diseases and exhibits strong anti-inflammatory activity. However, the molecular mode of action during mastitis prophylaxis remains poorly understood. In this study, a lipopolysaccharide (LPS)-induced mastitis mouse model showed that indirubin attenuated histopathological changes in the mammary gland, local tissue necrosis, and neutrophil infiltration. Moreover, indirubin significantly downregulated the production of interleukin (IL)-1β, IL-6, and tumor necrosis factor-α (TNF-α). We explored the mechanism whereby indirubin exerts protective effects against LPS-induced inflammation of mouse mammary epithelial cells (MMECs). The addition of different concentrations of indirubin before exposure of cells to LPS for 1 h significantly attenuated inflammation and reduced the concentrations of the three inflammatory cytokines in a dose-dependent manner. Indirubin downregulated LPS-induced cyclooxygenase-2 (COX-2) and Toll-like receptor 4 (TLR4) expression, inhibited phosphorylation of the LPS-induced nuclear transcription factor-kappa B (NF-kB) P65 protein and its inhibitor IkBα of the NF-kB signaling pathway. Furthermore, indirubin suppressed phosphorylation of P38, extracellular signal-regulated kinase (ERK), and c-Jun NH2-terminal kinase (JNK) of the mitogen-activated protein kinase (MAPK) signal pathways. Thus, indirubin effectively suppressed LPS-induced inflammation via TLR4 abrogation mediated by the NF-kB and MAPK signaling pathways and may be useful for mastitis prophylaxis.

KEY WORDS

indirubin lipopolysaccharide (LPS) TLR4 NF-kB MAPK inflammation 

Notes

ACKNOWLEDGMENTS

This project was supported by the Special Fund for China Agriculture Research System (Beef/Yak Cattle) (grant no. CARS-38); the Natural Science Foundation of Hubei Province, China (grant no. 2015CFB435); the National Natural Science Foundation of China (grant no. 31101874); and the Fundamental Research Funds for the Central Universities (grant nos. 2662015PY054 and 2662016PY015).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

10753_2016_447_MOESM1_ESM.doc (108 kb)
ESM 1 (DOC 107 kb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Jin-lun Lai
    • 1
  • Yu-hui Liu
    • 1
  • Chang Liu
    • 1
  • Ming-pu Qi
    • 1
  • Rui-ning Liu
    • 1
  • Xi-fang Zhu
    • 1
  • Qiu-ge Zhou
    • 1
  • Ying-yu Chen
    • 1
    • 2
  • Ai-zhen Guo
    • 1
    • 2
    Email author
  • Chang-min Hu
    • 1
    • 2
    Email author
  1. 1.The Faculty of Veterinary MedicineHuazhong Agricultural UniversityWuhanChina
  2. 2.State Key Laboratory of Agricultural MicrobiologyHuazhong Agricultural UniversityWuhanChina

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