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IFN-τ Attenuates LPS-Induced Endometritis by Restraining HMGB1/NF-κB Activation in bEECs

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Abstract

Endometritis is a common inflammatory disease in uterine tissues that leads to animal infertility. Among the causes, Escherichia coli infection is one of the main reasons. Interferon-tau (IFN-τ) is the initial pregnancy signal for ruminant embryos and can induce immune tolerance in humans and other species. However, there are scarce reports on whether IFN-τ has a regulatory effect on endometrial inflammatory damage through HMGB1-NF-κB signalling. The purpose of this study was to investigate the regulatory mechanism of IFN-τ in HMGB1-NF-κB signalling in LPS-induced endometritis. ELISA and qPCR were used to detect the expression of LPS-induced pro-inflammatory cytokines in bovine endometrial epithelial cells (bEECs or BEND) under IFN-τ intervention, and the levels of HMGB1, p-IKK and p-p65 were detected by Western blotting. The nuclear translocation of NF-κB p65 was determined through immunofluorescence. In addition, bEECs were transfected with si-HMGB1 to elucidate the key role of HMGB1 and IFN-τ in the endometrial inflammatory cascade. The results indicated that IFN-τ inhibits the expression of related pro-inflammatory cytokines in an inflammatory injury model of bovine endometrial epithelial cells induced by LPS. Furthermore, experiments have proven that IFN-τ has protective effects on E. coli endotoxin-induced endometritis in mice in vivo. IFN-τ inhibited the HMGB1-NF-κB axis and significantly reduced the secretion of pro-inflammatory cytokines, the expression of HMGB1 protein and the levels of IKK and NF-κB p65 phosphorylation. In summary, our results showed that IFN-τ resists E. coli endotoxin-induced endometritis by attenuating HMGB1/NF-κB signalling.

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Data Availability

The datasets used or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Many thanks to all the members of the veterinary clinical diagnostic laboratory for their meaningful suggestions.

Funding

The research was funded by the National Natural Science Foundation of China. [Nos. 31972744].

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Authors

Contributions

J.F.L. and G.Z.D. contributed to the conception and design of the study. J.F.L., S.G., A.Z. and Z.M.W. performed assays and furnished the lab study. T.Z. and X.F.M. performed data collection. Z.M.W. and J.F.L. conducted data analysis. J.F.L., G.Z.D. and X.F.G. drafted the manuscript. J.F.L., K.F.J., X.F.G. and G.Z.D. revised the paper. The authors have read and approved the final manuscript.

Corresponding authors

Correspondence to Xuefeng Guo or Ganzhen Deng.

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All animal experiments followed international, national and/or institutional guidelines for the care and use of animals. All procedures performed in research involving animals comply with the standards of institutions or practices where ethical research was conducted and had been approved by the Animal Research Ethics Committee of Huazhong Agricultural University (HZAUMO-2015-12).

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Liu, J., Wu, Z., Guo, S. et al. IFN-τ Attenuates LPS-Induced Endometritis by Restraining HMGB1/NF-κB Activation in bEECs. Inflammation 44, 1478–1489 (2021). https://doi.org/10.1007/s10753-021-01433-y

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