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Resistance of hypervirulent Klebsiella pneumoniae to both intracellular and
extracellular killing of neutrophils
#MMPMID28282434
Wang L
; Shen D
; Wu H
; Ma Y
PLoS One
2017[]; 12
(3
): e0173638
PMID28282434
show ga
Hypervirulent Klebsiella pneumoniae (HvKP) is hypermucoviscous organism, carrying
genes of rmpA and aerobactin, causing serious community-acquired infection and
metastatically spread in young healthy hosts. Neutrophils play an important role
during innate immune response against bacterial infection by phagocytosis and
neutrophil extracellular traps (NETs). Whether neutrophils can effectively defend
against HvKP remains unclear. In this study, we observed that the HvKP was
significantly more resistant to neutrophil-mediated phagocytosis and
intracellular killing than classic Klebsiella pneumoniae (cKP) isolates. Although
both HvKP and cKP induced NETs under scanning electron microscopy and confocal
microscopy, more cKP than HvKP were trapped in NETs, and the killing by
intracellular and extracellular mechanisms of neutrophils was detected only on
cKP. Together, our results demonstrated that HvKP resisted to both intracellular
and extracellular killing of neutrophils.