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Reproduction, Fertility and Development Reproduction, Fertility and Development Society
Vertebrate reproductive science and technology
RESEARCH ARTICLE (Open Access)

Betulonic acid regulates oviduct epithelial cell inflammation through the TLR4, MAPK, and JAK/STAT signalling pathways

Liang Shao A , Yan Yan B , Nansu Wang B , Qiongfang Tan B , Yuying Huang B , Lei Lei C , Dongmei Yang D and Ling Liu https://orcid.org/0000-0002-9833-3289 B *
+ Author Affiliations
- Author Affiliations

A Department of Emergency, The First Affiliated Hospital of Hunan Traditional Chinese Medicine College, Zhuzhou, Hunan, China.

B Department of TCM Gynaecology, The First Affiliated Hospital of Hunan Traditional Chinese Medicine College, Zhuzhou, Hunan, China.

C Combine Traditional Chinese and Western Medicine Institute, Hunan University of Chinese Medicine, Changsha, Hunan, China.

D Medical School, Hunan University of Chinese Medicine, Changsha, Hunan, China.

* Correspondence to: liuling930@126.com

Handling Editor: Alison Care

Reproduction, Fertility and Development 35(8) 480-491 https://doi.org/10.1071/RD21380
Published online: 5 May 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Infertility is a common disease among women of childbearing age and seriously endangers the reproductive health of human beings.

Aims

We aimed to study the active effect and mechanism of betulonic acid (BTA) on tubal inflammatory infertility.

Methods

An inflammatory model was established in isolated rat oviduct epithelial cells. Immunofluorescence of cytokeratin 18 was performed in cells. The therapeutic effect of BTA on cells was observed. Subsequently, we added JAK/STAT inhibitor AG490 and MAPK inhibitor U0126 and measured the levels of inflammatory factors via enzyme-linked immunosorbent assay and qRT-PCR. CCK-8 assay was applied to test cell proliferation, whereas flow cytometry was used to measure apoptosis. The levels of TLR4, IκBα, JAK1, JAK2, JAK3, Tyk2, STAT3, p38, ERK and the phosphorylation of p65 were determined by Western blotting.

Key results

Betulonic acid inhibited the activation of TLR4 and NF-κB signalling pathways, and significantly downregulated IL-1β, IL-6, and TNF-α, with high doses being the most effective. Furthermore, high-dose BTA promoted the proliferation of oviduct epithelial cells and inhibited apoptosis. In addition, BTA inhibited the activation of JAK/STAT signalling pathway to perform effectively in oviduct epithelial cells inflammation. The addition of AG490 led to the inhibition of the JAK/STAT signalling pathway. BTA also inhibited the activation of MAPK signalling pathway in oviduct epithelial cells inflammation. Under U0126 treatment, the inhibition of proteins in MAPK pathway by BTA was weakened.

Conclusions

Therefore, BTA inhibited the TLR, JAK/STAT and MAPK signalling pathways.

Implications

Our study provided a new therapeutic strategy for infertility caused by oviduct inflammation.

Keywords: betulonic acid, JAK, MAPK, NF-κB, rat oviduct epithelial cells, STAT, tubal inflammatory infertility, TLR4.

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