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The tst gene associated Staphylococcus aureus pathogenicity island facilitates its pathogenesis by promoting the secretion of inflammatory cytokines and inducing immune suppression.

Authors
  • Zheng, Yi1
  • Qin, Chenhao1
  • Zhang, Xianfeng2
  • Zhu, Yifan3
  • Li, Aiqing1
  • Wang, Min1
  • Tang, Yiwei4
  • Kreiswirth, Barry N5
  • Chen, Liang5
  • Zhang, Haifang1
  • Du, Hong6
  • 1 Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, 215004, PR China. , (China)
  • 2 Department of Clinical Laboratory, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, 215004, PR China. , (China)
  • 3 School of Psychiatry, North Sichuan Medical College, Nanchong, Sichuan, 637007, PR China. , (China)
  • 4 Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA.
  • 5 Public Health Research Institute Tuberculosis Center, New Jersey Medical School, Rutgers University, Newark, NJ, 07103, USA. , (Jersey)
  • 6 Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, 215004, PR China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Microbial Pathogenesis
Publisher
Elsevier
Publication Date
Oct 12, 2019
Volume
138
Pages
103797–103797
Identifiers
DOI: 10.1016/j.micpath.2019.103797
PMID: 31614194
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Staphylococcus aureus (S. aureus) is an important pathogen causing various limited or systemic infections. Methicillin resistant S. aureus (MRSA) in particular presents a major clinical and public health problem. Toxic shock syndrome toxin-1 (TSST-1) encoded by the gene tst is an important virulence factor of tst positive S. aureus, leading to multi-organ malfunction. However, the mechanism of TSST-1 in pathogenesis is only partly clear. In this study, we investigated the prevalence of the tst gene in clinical isolates of S. aureus. Then, animal experiments were performed to further evaluate the influence of the presence of the tst gene associated Staphylococcus aureus Pathogenicity Island (SaPI) on body weight, serum cytokine concentrations and the bacterial load in different organs. In addition, macrophages were used to analyze the secretion of cytokines in vitro and bacterial survival in the cytoplasm. Finally, pathological analysis was carried out to evaluate organ tissue impairment. The results demonstrated that the prevalence of tst gene was approximately 17.8% of the bacterial strains examined. BALB/c mice infected with tst gene associated SaPI positive isolates exhibited a severe loss of body weight and a high bacterial load in the liver, heart, kidney and spleen. Pathological analysis demonstrated that tissue impairment was more severe after infection with tst gene associated SaPI positive isolates. Moreover, the secretion of IL-6, IL-2 and IL17A by macrophages infected with tst gene associated SaPI positive isolates clearly increased. Notably, IL-6 secretion in BALB/c mice infected with tst gene associated SaPI positive isolates was higher than that in BALB/c mice infected with negative ones. Together, these results indicated that the tst gene associated SaPI may play a critical role in the pathological process of infection via a direct and persistent toxic function, and by promoting the secretion of inflammatory cytokines that indirectly induce immune suppression. Copyright © 2019 Elsevier Ltd. All rights reserved.

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