Suilysin Stimulates the Release of Heparin Binding Protein from Neutrophils and Increases Vascular Permeability in Mice
Shaolong Chen, Wenlong Xie, Kai Wu, Ping Li, Zhiqiang Ren, Lin Li, Yuan Yuan, Chunmao Zhang, Yuling Zheng, Qingyu Lv, Hua Jiang, Yongqiang Jiang, Shaolong Chen, Wenlong Xie, Kai Wu, Ping Li, Zhiqiang Ren, Lin Li, Yuan Yuan, Chunmao Zhang, Yuling Zheng, Qingyu Lv, Hua Jiang, Yongqiang Jiang
Abstract
Most of the deaths that occurred during two large outbreaks of Streptococcus suis infections in 1998 and 2005 in China were caused by streptococcal toxic shock syndrome (STSS), which is characterized by increased vascular permeability. Heparin-binding protein (HBP) is thought to mediate the vascular leakage. The purpose of this study was to investigate the detailed mechanism underlying the release of HBP and the vascular leakage induced by S. suis. Significantly higher serum levels of HBP were detected in Chinese patients with STSS than in patients with meningitis or healthy controls. Suilysin (SLY) is an exotoxin secreted by the highly virulent strain 05ZYH33, and it stimulated the release of HBP from the polymorphonuclear neutrophils and mediated vascular leakage in mice. The release of HBP induced by SLY was caused by a calcium influx-dependent degranulation. Analyses using a pharmacological approach revealed that the release of HBP induced by SLY was related to Toll-like receptor 4, p38 mitogen-activated protein kinase, and the 1-phosphatidylinositol 3-kinase pathway. It was also dependent on a G protein-coupled seven-membrane spanning receptor. The results of this study provide new insights into the vascular leakage in STSS associated with non-Group A streptococci, which could lead to the discovery of potential therapeutic targets for STSS associated with S. suis.
Keywords: Streptococcus suis-associated streptococcal toxic shock syndrome; heparin binding protein; suilysin; vascular permeability.
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References
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