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2017 ; 13
(5
): e1006387
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Antigen delivery to dendritic cells shapes human CD4+ and CD8+ T cell memory
responses to Staphylococcus aureus
#MMPMID28542586
Uebele J
; Stein C
; Nguyen MT
; Schneider A
; Kleinert F
; Tichá O
; Bierbaum G
; Götz F
; Bekeredjian-Ding I
PLoS Pathog
2017[May]; 13
(5
): e1006387
PMID28542586
show ga
Intracellular persistence of Staphylococcus aureus favors bacterial spread and
chronic infections. Here, we provide evidence for the existence of human CD4+ and
CD8+ T cell memory against staphylococcal antigens. Notably, the latter could
provide a missing link in our understanding of immune control of intracellular S.
aureus. The analyses showed that pulsing of monocyte-derived dendritic cells
(MoDC) with native staphylococcal protein antigens induced release of
Th2-associated cytokines and mediators linked to T regulatory cell development
(G-CSF, IL-2 and IL-10) from both CD4+ and CD8+ T cells, thus revealing a state
of tolerance predominantly arising from preformed memory T cells. Furthermore,
G-CSF was identified as a suppressor of CD8+ T cell-derived IFN? secretion, thus
confirming a tolerogenic role of this cytokine in the regulation of T cell
responses to S. aureus. Nevertheless, delivery of in vitro transcribed
mRNA-encoded staphylococcal antigens triggered Th1-biased responses, e.g. IFN?
and TNF release from both naďve and memory T cells. Collectively, our data
highlight the potential of mRNA-adjuvanted antigen presentation to enable
inflammatory responses, thus overriding the existing Th2/Treg-biased memory T
cell response to native S. aureus antigens.