Effects of metformin on Streptococcus suis LuxS/AI-2 quorum sensing system and biofilm formation

被引：16

作者：

Zuo, Jing ^{[1
,2
]}

Shen, Yamin ^{[1
,2
]}

Wang, Haikun ^{[1
,2
]}

Gao, Shuji ^{[1
,2
]}

Yuan, Shuo ^{[1
,2
]}

Song, Dong ^{[1
,2
]}

Wang, Yuxin ^{[1
,2
]}

Wang, Yang ^{[1
,2
]}

机构：

[1] Henan Univ Sci & Technol, Coll Anim Sci & Technol, Luoyang, Peoples R China

[2] Henan Engn Res Ctr Livestock & Poultry Emerging Di, Luoyang, Peoples R China

来源：

MICROBIAL PATHOGENESIS | 2023年 / 181卷

基金：

中国国家自然科学基金;

关键词：

Streptococcus suis; Metformin; Biofilm; LuxS; AI-2; system; Anti-biofilm; VIRULENCE; TOLERANCE; INFECTION; ROLES;

D O I：

10.1016/j.micpath.2023.106183

中图分类号：

R392 [医学免疫学]; Q939.91 [免疫学];

学科分类号：

100102 ;

摘要：

Streptococcus suis (S. suis) regulates biofilm formation through LuxS/AI-2 quorum sensing system, increasing drug resistance and exacerbating infection. The anti-hyperglycaemic agent metformin has anti-bacterial and anti-biofilm activities. This study aimed to investigate the anti-biofilm and anti-quorum sensing activity of metfor-min in S. suis. We first determined the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of metformin on S. suis. The results indicated that metformin showed no obvious inhibitory or bactericidal effect. Crystal violet staining showed that metformin significantly inhibited the formation of S. suis biofilm at sub-MIC concentration, which was also confirmed by scanning electron microscopy. Then, we quantified the AI-2 signal molecules in S. suis, and the results showed that metformin had a significant inhibitory effect on the production of AI-2 signal in S. suis. Inhibition of enzyme activity and molecular docking experiments showed that metformin has a significant binding activity to LuxS protein. In addition, qRT-PCR results showed that metformin significantly down-regulated the expression of AI-2 synthesis-related genes luxS and pfs, and adhesion-related genes luxS, pfs, gapdh, sly, fbps, and ef. Western blotting also showed that metformin signifi-cantly reduced the expression of LuxS protein. Our study suggests that metformin seems to be a suitable candidate for the inhibition of S. suis LuxS/AI-2 QS system and prevention of biofilm formation, which provided a new idea for the prevention and control of S. suis.

引用

页数：7