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2016 ; 10
(8
): e0004935
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Liver Necrosis and Lethal Systemic Inflammation in a Murine Model of Rickettsia
typhi Infection: Role of Neutrophils, Macrophages and NK Cells
#MMPMID27548618
Papp S
; Moderzynski K
; Rauch J
; Heine L
; Kuehl S
; Richardt U
; Mueller H
; Fleischer B
; Osterloh A
PLoS Negl Trop Dis
2016[Aug]; 10
(8
): e0004935
PMID27548618
show ga
Rickettsia (R.) typhi is the causative agent of endemic typhus, an emerging
febrile disease that is associated with complications such as pneumonia,
encephalitis and liver dysfunction. To elucidate how innate immune mechanisms
contribute to defense and pathology we here analyzed R. typhi infection of CB17
SCID mice that are congenic to BALB/c mice but lack adaptive immunity. CB17 SCID
mice succumbed to R. typhi infection within 21 days and showed high bacterial
load in spleen, brain, lung, and liver. Most evident pathological changes in R.
typhi-infected CB17 SCID mice were massive liver necrosis and splenomegaly due to
the disproportionate accumulation of neutrophils and macrophages (M?). Both
neutrophils and M? infiltrated the liver and harbored R. typhi. Both cell
populations expressed iNOS and produced reactive oxygen species (ROS) and, thus,
exhibited an inflammatory and bactericidal phenotype. Surprisingly, depletion of
neutrophils completely prevented liver necrosis but neither altered bacterial
load nor protected CB17 SCID mice from death. Furthermore, the absence of
neutrophils had no impact on the overwhelming systemic inflammatory response in
these mice. This response was predominantly driven by activated M? and NK cells
both of which expressed IFN? and is considered as the reason of death. Finally,
we observed that iNOS expression by M? and neutrophils did not correlate with R.
typhi uptake in vivo. Moreover, we demonstrate that M? hardly respond to R. typhi
in vitro. These findings indicate that R. typhi enters M? and also neutrophils
unrecognized and that activation of these cells is mediated by other mechanisms
in the context of tissue damage in vivo.