Characterization of a new cytotoxin that contributes to Staphylococcus aureus pathogenesis.
Staphylococcus aureus is an important pathogen that continues to be a significant global health threat because of the prevalence of methicillin-resistant S. aureus strains (MRSA). The pathogenesis of this organism is partly attributed to the production of a large repertoire of cytotoxins that target and kill innate immune cells, which provide the first line of defence against S. aureus infection. Here we demonstrate that leukocidin A/B (LukAB) is required and sufficient for the ability of S. aureus, including MRSA, to kill human neutrophils, macrophages and dendritic cells. LukAB targets the plasma membrane of host cells resulting in cellular swelling and subsequent cell death. We found that S. aureus lacking lukAB are severely impaired in their ability to kill phagocytes during bacteria-phagocyte interaction, which in turn renders the lukAB-negative staphylococci more susceptible to killing by neutrophils. Notably, we show that lukAB is expressed in vivo within abscesses in a murine infection model and that it contributes significantly to pathogenesis of MRSA in an animal host. Collectively, these results extend our understanding of how S. aureus avoids phagocyte-mediated clearance, and underscore LukAB as an important factor that contributes to staphylococcal pathogenesis.
Departments of Microbiology Medicine Division of Infectious Diseases Pathology, New York University School of Medicine, New York, NY 10016, USA.
Ashley L
AL
Dumont
Tyler K
TK
Nygaard
Robert L
RL
Watkins
Amanda
A
Smith
Lina
L
Kozhaya
Barry N
BN
Kreiswirth
Bo
B
Shopsin
Derya
D
Unutmaz
Jovanka M
JM
Voyich
Victor J
VJ
Torres
D016923:Cell Death; D002462:Cell Membrane / Q000378:metabolism / Q000648:ultrastructure; D019610:Cytoprotection; D003603:Cytotoxins / Q000378:metabolism*; D018922:HL-60 Cells; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000472:pathogenicity; D010586:Phagocytes / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure; D013211:Staphylococcus aureus / Q000472:pathogenicity*
D003603:Cytotoxins
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