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2017 ; 11
(ä): 147-153
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Quantitative analysis of hemin-induced neutrophil extracellular trap formation
and effects of hydrogen peroxide on this phenomenon
#MMPMID28955779
Ohbuchi A
; Kono M
; Kitagawa K
; Takenokuchi M
; Imoto S
; Saigo K
Biochem Biophys Rep
2017[Sep]; 11
(ä): 147-153
PMID28955779
show ga
Formation of neutrophil extracellular traps (NETs) can perpetuate sterile
inflammation; thus, it is important to clarify their pathophysiological
characteristics. Free heme, derived via hemolysis, is a major contributor to
organ damage, and reportedly induces neutrophil activation as well as reactive
oxygen species (ROS) production and NET formation. For this study, we examined
hemin (Fe(3+) -protoporphyrin IX)-induced NET formation quantitatively in vitro
as well as the effects of oxidative stress. NETs formed in vitro from cultured
neutrophils were quantitatively detected by using nuclease treatment and Sytox
Green, a nucleic acid stain. Hemin-induced NET production was found to be in a
dose-dependent manner, NADPH oxidase-dependent and toll-like receptor (TLR)-4
independent. Additionally, the iron molecule in the porphyrin ring was considered
essential for the formation of NETs. In the presence of low concentrations of
hydrogen peroxide, low concentrations of hemin-induced NETs were enhanced, unlike
those of phorbol myristate acetate (PMA)-induced NETs. Quantitative analysis of
NET formation may prove to be a useful tool for investigating NET physiology, and
hemin could function as a possible therapeutic target for hemolysis-related
events.