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Journal of Zhejiang University-SCIENCE B

, Volume 20, Issue 10, pp 816–827 | Cite as

Catalpol ameliorates LPS-induced endometritis by inhibiting inflammation and TLR4/NF-κB signaling

  • Hua Zhang
  • Zhi-min Wu
  • Ya-ping Yang
  • Aftab Shaukat
  • Jing Yang
  • Ying-fang Guo
  • Tao Zhang
  • Xin-ying Zhu
  • Jin-xia Qiu
  • Gan-zhen DengEmail author
  • Dong-mei ShiEmail author
Article
  • 3 Downloads

Abstract

Catalpol is the main active ingredient of an extract from Radix rehmanniae, which in a previous study showed a protective effect against various types of tissue injury. However, a protective effect of catalpol on uterine inflammation has not been reported. In this study, to investigate the protective mechanism of catalpol on lipopolysaccharide (LPS)-induced bovine endometrial epithelial cells (bEECs) and mouse endometritis, in vitro and in vivo inflammation models were established. The Toll-like receptor 4 (TLR4)/nuclear factor-κB (NF-κB) signaling pathway and its downstream inflammatory factors were detected by enzyme-linked immunosorbent assay (ELISA), quantitative real-time polymerase chain reaction (qRT-PCR), western blot (WB), and immunofluorescence techniques. The results from ELISA and qRT-PCR showed that catalpol dose-dependently reduced the expression of pro-inflammatory cytokines such as tumor necrosis factor α (TNF-α), interleukin (IL)-1β, and IL-6, and chemokines such as C-X-C motif chemokine ligand 8 (CXCL8) and CXCL5, both in bEECs and in uterine tissue. From the experimental results of WB, qRT-PCR, and immunofluorescence, the expression of TLR4 and the phosphorylation of NF-κB p65 were markedly inhibited by catalpol compared with the LPS group. The inflammatory damage to the mouse uterus caused by LPS was greatly reduced and was accompanied by a decline in myeloperoxidase (MPO) activity. The results of this study suggest that catalpol can exert an anti-inflammatory impact on LPS-induced bEECs and mouse endometritis by inhibiting inflammation and activation of the TLR4/NF-κB signaling pathway.

Keywords

Catalpol Endometritis Inflammation Toll-like receptor 4 (TLR4) Nuclear factor-KB (NF-κB) 

梓醇通过抑制炎症反应和 TLR4/NF-κB 信号通路改善脂多糖诱导的小鼠子宫内膜炎

概要

目 的

研究和探讨梓醇对脂多糖 (LPS)诱导的牛子宫内膜上皮细胞和小鼠子宫内膜炎的保护机制。

创新点

首次证明梓醇对 LPS 刺激的牛子宫内膜上皮细胞炎症和 LPS 诱导的小鼠子宫内膜炎具有保护作用, 其保护机制与抑制 Toll 样受体 4/核因子 κB (TLR4/NF-κB) 炎症信号通路有关。

方 法

通过 LPS 的诱导, 分别建立牛子宫内膜上皮细胞体外炎症模型和小鼠子宫内膜体内炎症模型, 设置不同梓醇作用浓度梯度, 采用酶联免疫吸附测定法 (ELISA)、 实时荧光定量聚合酶链式反应 (qRT0PCR)、 蛋白免疫印迹 (western blot) 和免疫荧光技术检测 TLR4/NF-κB 信号通路及其下游炎症因子的表达。

结 论

梓醇可以显著抑制 TLR4 和 p65 NF-κB 信号通路的表达, 降低炎性因子肿瘤坏死因子 α (TNF-α)、 白细胞介素 1β (IL-1β) 和白细胞介素 6 (IL-6) 的水平以及趋化因子 CXCL8 和 CXCL5 的表达, 同时降低子宫组织髓过氧化物酶水平。 通过在体内外炎症模型中加入梓醇, 可以显著降低牛子宫内膜上皮细胞的炎症反应, 有效保护小鼠体内子宫内膜的组织损伤。

关键词

梓醇 子宫内膜炎 炎症 Toll 样受体 4/核因子 κB (TLR4/NF-κB) 

CLC number

S854.8 

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Notes

Contributors

Hua ZHANG and Zhi-min WU designed and performed this study. Ya-ping YANG, Jing YANG, and Ying-fang GUO assisted in carrying out the research. Aftab SHAUKAT assisted in editing language. Tao ZHANG, Xin-ying ZHU, and Jin-xia QIU assisted in analyzing the data. Gan-zhen DENG and Dong-mei SHI proofread the manuscript. All authors have approved the final manuscript. Therefore, all authors have full access to all the data in the study and take responsibility for the integrity and security of the data.

Compliance with ethics guidelines

Hua ZHANG, Zhi-min WU, Ya-ping YANG, Aftab SHAUKAT, Jing YANG, Ying-fang GUO, Tao ZHANG, Xin-ying ZHU, Jin-xia QIU, Gan-zhen DENG, and Dong-mei SHI declare that they have no conflicts of interest.

All institutional and national guidelines for the care and use of laboratory animals were followed. The animal experiments were carried out according to the guidelines of the Laboratory Animal Research Center of Hubei Province and approved by the Ethical Committee on Animal Research at Huazhong Agricultural University (HZAUMO-2015-12), Wuhan, China.

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Copyright information

© Zhejiang University and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Clinical Veterinary Medicine, College of Veterinary MedicineHuazhong Agricultural UniversityWuhanChina
  2. 2.Department of Veterinary MedicineHenan University of Animal Husbandry and EconomyZhengzhouChina

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