The Anti-inflammatory Protein TSG-6 Induced by S. aureus Regulates the Chemokine Function of Endothelial Cells In Vitro by Inhibiting the Chemokine-Glycosaminoglycan Interaction

The aim of this study was to explore the effect of the anti-inflammatory protein TSG-6 induced by Staphylococcus bacteria on the regulation of chemokine function in endothelial cells by inhibiting the chemokine-glycosaminoglycan interaction. To cultivate human umbilical vein endothelial cells and Staphylococcus aureus bacteria, respectively, after the experiment is divided into the control group, S. aureus bacteria–induced group, S. aureus bacteria glycosaminoglycans about 1 mg/L sugar group, S. aureus bacteria glycosaminoglycans about 5 mg/L sugar group, and S. aureus bacteria glycosaminoglycans about 10 mg/L sugar group, E-selectin; intercellular adhesion molecule-1 (ICAM-1); monocyte chemoattractant protein-1 (MCP-1); interleukin-8 (IL-8) expression level; chemokine CXCL9, CXCL10, and CXCL11 mRNA and protein expression level; and TSG mRNA and protein expression level were determined in each cell; the endothelial cell proliferation and vascular endothelial cell function indicators were analyzed. The expression levels of E-selectin, ICAM-1, IL-8, MCP-1, and chemokines CXCL9, CXCL10, and CXCL11 mRNA and protein in each group at 6, 12, and 24 h were significantly different (P < 0.05). TSG mRNA and protein expression levels, endothelial cell proliferation ability, and vascular endothelial cell function were also significantly different (P < 0.05). The expression levels of E-selectin, ICAM-1, IL-8, MCP-1, endothelial cell proliferation ability, and vascular endothelial cell function in the Staphylococcus aureus–induced group were lower than those in the control group and the Staphylococcus aureus glycosaminoglycan group, and the mRNA and protein expression levels of chemokines CXCL9, CXCL10, and CXCL11, and TSG mRNA and protein expression levels were higher. With the increase of glycosaminoglycan concentration, the above indexes were improved. The anti-inflammatory protein TSG-6 induced by S. aureus can regulate the chemokine function of endothelial cells by inhibiting the chemokine-glycosaminoglycan interaction.