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2016 ; 6
(ä): 37252
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Neutrophil extracellular traps are indirectly triggered by lipopolysaccharide and
contribute to acute lung injury
#MMPMID27849031
Liu S
; Su X
; Pan P
; Zhang L
; Hu Y
; Tan H
; Wu D
; Liu B
; Li H
; Li H
; Li Y
; Dai M
; Li Y
; Hu C
; Tsung A
Sci Rep
2016[Nov]; 6
(ä): 37252
PMID27849031
show ga
Neutrophil extracellular traps (NETs) facilitate the extracellular killing of
pathogens. However, excessive NETs formation and poor degradation are associated
with exacerbated immune responses and tissue injury. In this study, we
investigated the role of NETs in lipopolysaccharide (LPS)-mediated acute lung
injury (ALI) and assessed the use of DNase I, for the treatment of ALI.
Additionally, we focused on the controversial issue of whether LPS directly
induces NETs release in vitro. NETs formation was detected in murine ALI tissue
in vivo and was associated with increased NETs markers, citrullinated-histone H3
tissue levels and NET-DNA levels in BALF. Treatment with DNase I significantly
degraded NETs and reduced citrullinated-histone H3 levels, which protected
against ALI and ameliorated pulmonary oedema and total protein in BALF. In
addition, DNase I significantly reduced IL-6 and TNF-? levels in plasma and BALF.
In vitro, LPS-activated platelets rather than LPS alone efficiently induced NETs
release. In conclusion, NETs formed during LPS-induced ALI, caused organ damage
and initiated the inflammatory response. NETs degradation by DNase I promoted
NET-protein clearance and protected against ALI in mice; thus, DNase I may be a
new potential adjuvant for ALI therapy. Specifically, LPS induced NETs formation
in an indirect manner via platelets activation.