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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+Pathog
2017 ; 13
(11
): e1006696
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English Wikipedia
Natural killer cell-intrinsic type I IFN signaling controls Klebsiella pneumoniae
growth during lung infection
#MMPMID29112952
Ivin M
; Dumigan A
; de Vasconcelos FN
; Ebner F
; Borroni M
; Kavirayani A
; Przybyszewska KN
; Ingram RJ
; Lienenklaus S
; Kalinke U
; Stoiber D
; Bengoechea JA
; Kovarik P
PLoS Pathog
2017[Nov]; 13
(11
): e1006696
PMID29112952
show ga
Klebsiella pneumoniae is a significant cause of nosocomial pneumonia and an
alarming pathogen owing to the recent isolation of multidrug resistant strains.
Understanding of immune responses orchestrating K. pneumoniae clearance by the
host is of utmost importance. Here we show that type I interferon (IFN) signaling
protects against lung infection with K. pneumoniae by launching bacterial
growth-controlling interactions between alveolar macrophages and natural killer
(NK) cells. Type I IFNs are important but disparate and incompletely understood
regulators of defense against bacterial infections. Type I IFN receptor 1
(Ifnar1)-deficient mice infected with K. pneumoniae failed to activate NK
cell-derived IFN-? production. IFN-? was required for bactericidal action and the
production of the NK cell response-amplifying IL-12 and CXCL10 by alveolar
macrophages. Bacterial clearance and NK cell IFN-? were rescued in
Ifnar1-deficient hosts by Ifnar1-proficient NK cells. Consistently, type I IFN
signaling in myeloid cells including alveolar macrophages, monocytes and
neutrophils was dispensable for host defense and IFN-? activation. The failure of
Ifnar1-deficient hosts to initiate a defense-promoting crosstalk between alveolar
macrophages and NK cell was circumvented by administration of exogenous IFN-?
which restored endogenous IFN-? production and restricted bacterial growth. These
data identify NK cell-intrinsic type I IFN signaling as essential driver of K.
pneumoniae clearance, and reveal specific targets for future therapeutic
exploitations.