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2015 ; 7
(12
): 5308-19
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Superantigen-Producing Staphylococcus aureus Elicits Systemic Immune Activation
in a Murine Wound Colonization Model
#MMPMID26670252
Kim CK
; Karau MJ
; Greenwood-Quaintance KE
; Tilahun AY
; Krogman A
; David CS
; Pritt BS
; Patel R
; Rajagopalan G
Toxins (Basel)
2015[Dec]; 7
(12
): 5308-19
PMID26670252
show ga
Staphylococcus aureus, the most common cause of wound infection, produces several
exotoxins, including superantigens (SAgs). SAgs are the potent activators of the
immune system. Given this unique property, we hypothesized that SAgs produced by
S. aureus in wounds would have local, as well as systemic immunologic effects. We
tested our hypothesis using a novel staphylococcal skin wound infection model in
transgenic mice expressing HLA-DR3. Skin wounds were left uninfected or colonized
with S. aureus strains producing SAgs or an isogenic strain not producing any
SAg. Animals with wounds challenged with SAg-producing S. aureus had increased
morbidity and lower serum IL-17 levels compared to those challenged with the SAg
non-producing S. aureus (p = 0.027 and p = 0.032, respectively). At Day 8
following microbial challenge, compared to mice with uninfected wounds, the
proportion of V?8?CD4? T cells was increased, while the proportion of V?8?CD8? T
cells was decreased only in the spleens of mice challenged with SAg-producing S.
aureus (p < 0.001). No such changes were measured in mice challenged with SAg
non-producing S. aureus. Lungs, livers and kidneys from mice challenged with
SAg-producing, but not SAg non-producing, S. aureus showed inflammatory changes.
Overall, SAg-mediated systemic immune activation in wounds harboring S. aureus
may have clinical implications.