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2015 ; 6
(ä): 6673
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Molecular mechanisms of NET formation and degradation revealed by intravital
imaging in the liver vasculature
#MMPMID25809117
Kolaczkowska E
; Jenne CN
; Surewaard BG
; Thanabalasuriar A
; Lee WY
; Sanz MJ
; Mowen K
; Opdenakker G
; Kubes P
Nat Commun
2015[Mar]; 6
(ä): 6673
PMID25809117
show ga
Neutrophil extracellular traps (NETs) composed of DNA decorated with histones and
proteases trap and kill bacteria but also injure host tissue. Here we show that
during a bloodstream infection with methicillin-resistant Staphylococcus aureus,
the majority of bacteria are sequestered immediately by hepatic Kupffer cells,
resulting in transient increases in liver enzymes, focal ischaemic areas and a
robust neutrophil infiltration into the liver. The neutrophils release NETs into
the liver vasculature, which remain anchored to the vascular wall via von
Willebrand factor and reveal significant neutrophil elastase (NE) proteolytic
activity. Importantly, DNase although very effective at DNA removal, and somewhat
effective at inhibiting NE proteolytic activity, fails to remove the majority of
histones from the vessel wall and only partly reduces injury. By contrast,
inhibition of NET production as modelled by PAD4-deficiency, or prevention of NET
formation and proteolytic activity as modelled in NE(-/-) mice prevent collateral
host tissue damage.