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2017 ; 6
(ä): ä Nephropedia Template TP
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Diverse stimuli engage different neutrophil extracellular trap pathways
#MMPMID28574339
Kenny EF
; Herzig A
; Krüger R
; Muth A
; Mondal S
; Thompson PR
; Brinkmann V
; Bernuth HV
; Zychlinsky A
Elife
2017[Jun]; 6
(ä): ä PMID28574339
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Neutrophils release neutrophil extracellular traps (NETs) which ensnare pathogens
and have pathogenic functions in diverse diseases. We examined the NETosis
pathways induced by five stimuli; PMA, the calcium ionophore A23187, nigericin,
Candida albicans and Group B Streptococcus. We studied NET production in
neutrophils from healthy donors with inhibitors of molecules crucial to
PMA-induced NETs including protein kinase C, calcium, reactive oxygen species,
the enzymes myeloperoxidase (MPO) and neutrophil elastase. Additionally,
neutrophils from chronic granulomatous disease patients, carrying mutations in
the NADPH oxidase complex or a MPO-deficient patient were examined. We show that
PMA, C. albicans and GBS use a related pathway for NET induction, whereas
ionophores require an alternative pathway but that NETs produced by all stimuli
are proteolytically active, kill bacteria and composed mainly of chromosomal DNA.
Thus, we demonstrate that NETosis occurs through several signalling mechanisms,
suggesting that extrusion of NETs is important in host defence.