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Trueperella pyogenes pyolysin inhibits lipopolysaccharide-induced inflammatory response in endometrium stromal cells via autophagy- and ATF6-dependent mechanism

  • Veterinary Microbiology - Research Paper
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Abstract

Trueperella pyogenes (T. pyogenes) is a common opportunistic pathogen of many livestock and play an important regulation role during multibacterial infection and interaction with the host by its primary virulence factor pyolysin (PLO). The purpose of this study was to investigate the regulation role of PLO which serve as a combinational pathogen with lipopolysaccharide (LPS) during endometritis. In this study, the expression of bioactive recombinant PLO (rPLO) in a prokaryotic expression system and its purification are described. Moreover, we observed that rPLO inhibited the innate immune response triggered by LPS and that methyl-β-cyclodextrin (MBCD) abrogated this inhibitory effect in goat endometrium stromal cells (gESCs). Additionally, we show from pharmacological and genetic studies that rPLO-induced autophagy represses gene expression by inhibiting NLRP3 inflammasome activation. Importantly, this study reported that ATF6 serves as a primary regulator of the cellular inflammatory reaction to rPLO. Overall, these observations suggest that T. pyogenes PLO could create an immunosuppressive environment for other pathogens invasion by regulating cellular signaling pathways.

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Acknowledgments

We sincerely thank Professor Wei Liu and Associate Professor Keqiong Tang for providing help when we designed the study.

Funding

This study was supported by National Natural Science Foundation of China, Grant Number: 31772817.

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Author notes

  1. Maozhen Qi and Jianguo Liu contributed equally to this work.

Authors and Affiliations

  1. Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China

    Maozhen Qi, Jianguo Liu, Qingran Jiang, Hongyu Niu, Xinyu Wang, Dong Zhou, Pengfei Lin, Huatao Chen & Yaping Jin

  2. Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China

    Maozhen Qi, Jianguo Liu, Qingran Jiang, Hongyu Niu, Xinyu Wang, Dong Zhou, Pengfei Lin, Huatao Chen, Aihua Wang & Yaping Jin

  3. Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China

    Aihua Wang

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  1. Maozhen Qi
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Figure S

Construction of the recombinant vector and purification of the fusion protein. A. The gene fragment encoding mature T. pyogenes PLO was cloned by PCR. B. The PLO gene fragment was connected to the prokaryotic expression vector pET-32a (+). Lane 1 shows PLO gene amplification from recombinant vector pET-32a-PLO. Lane 2 shows the positive control with the T. pyogenes genome as the PCR template. Lane 3 shows the negative control. C. Purified protein was authenticated by Coomassie brilliant blue staining (DOCX 370 kb)

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Qi, M., Liu, J., Jiang, Q. et al. Trueperella pyogenes pyolysin inhibits lipopolysaccharide-induced inflammatory response in endometrium stromal cells via autophagy- and ATF6-dependent mechanism. Braz J Microbiol 52, 939–952 (2021). https://doi.org/10.1007/s42770-021-00422-5

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