Journal
MICROORGANISMS
Volume 9, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/microorganisms9112392
Keywords
Streptococcus suis; neutrophils; innate immunity; virulence factors
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [342150, 04435]
- Swine and Poultry Infectious Diseases Research Centre scholarship - Fonds de recherche du Quebec-Nature et technologies [RS-170946]
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Streptococcus suis infection can lead to various clinical manifestations mainly due to exacerbated inflammation, in which neutrophils play a key role. However, research on the functions and roles of neutrophils in Streptococcus suis infection is still limited.
Streptococcus suis is a swine pathogen and zoonotic agent responsible for economic losses to the porcine industry. Infected animals may develop meningitis, arthritis, endocarditis, sepsis and/or sudden death. The pathogenesis of the infection implies that bacteria breach mucosal host barriers and reach the bloodstream, where they escape immune-surveillance mechanisms and spread throughout the organism. The clinical manifestations are mainly the consequence of an exacerbated inflammation, defined by an exaggerated production of cytokines and recruitment of immune cells. Among them, neutrophils arrive first in contact with the pathogens to combat the infection. Neutrophils initiate and maintain inflammation, by producing cytokines and deploying their arsenal of antimicrobial mechanisms. Furthermore, neutrophilic leukocytosis characterizes S. suis infection, and lesions of infected subjects contain a large number of neutrophils. Therefore, this cell type may play a role in host defense and/or in the exacerbated inflammation. Nevertheless, a limited number of studies addressed the role or functions of neutrophils in the context of S. suis infection. In this review, we will explore the literature about S. suis and neutrophils, from their interaction at a cellular level, to the roles and behaviors of neutrophils in the infected host in vivo.
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