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Quercetin reduces Streptococcus suis virulence by inhibiting suilysin activity and inflammation
- Source :
- International Immunopharmacology. 69:71-78
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Streptococcus suis, a globally distributed bacterial pathogen, is an important zoonotic agent for humans and animals that can lead to multiple deaths and cause major economic losses. Suilysin (SLY), secreted by most pathogenic S. suis strains, is a cytotoxic toxin that belongs to the cholesterol-dependent cytolysin family; this toxin plays a key role in a mouse meningitis model, suggesting that effective interference with the biological activity of SLY may be a potential treatment for S. suis infection. In addition, the inflammatory response induced by S. suis is an important manifestation in infections and is associated with multiple fatal diseases. In this study, we found that the natural compound quercetin can directly inhibit the pore-forming activity of SLY without affecting bacterial growth and SLY secretion at the concentrations tested in our assay. In addition, quercetin treatment significantly alleviated cytotoxicity caused by S. suis infection and effectively reduced the release of the pro-inflammatory cytokines IL-1β, IL-6, and tumor necrosis factor alpha (TNF-α) stimulated by bacteria. Significantly decreased mortality was observed for the S. suis-infected mice that received quercetin. Our results suggested that quercetin may represent a promising therapeutic candidate for S. suis infection by targeting SLY and the subsequent inflammation. The present study provides a new strategy and leading compound for S. suis infection.
- Subjects :
- 0301 basic medicine
Streptococcus suis
Swine
Immunology
Anti-Inflammatory Agents
Virulence
Inflammation
Biology
medicine.disease_cause
Cell Line
Microbiology
Hemolysin Proteins
Mice
03 medical and health sciences
0302 clinical medicine
Streptococcal Infections
medicine
Animals
Humans
Immunology and Allergy
Secretion
Pathogen
Swine Diseases
Pharmacology
Toxin
Macrophages
biology.organism_classification
Mice, Inbred C57BL
Disease Models, Animal
030104 developmental biology
030220 oncology & carcinogenesis
Cytokines
Female
Quercetin
Tumor necrosis factor alpha
Cytolysin
Inflammation Mediators
medicine.symptom
Subjects
Details
- ISSN :
- 15675769
- Volume :
- 69
- Database :
- OpenAIRE
- Journal :
- International Immunopharmacology
- Accession number :
- edsair.doi.dedup.....f822b7981b1d2c182769dc7d5fe5f538