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2016 ; 2016
(ä): 9636937
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Intermittent Hypoxia Affects the Spontaneous Differentiation In Vitro of Human
Neutrophils into Long-Lived Giant Phagocytes
#MMPMID26635914
Dyugovskaya L
; Berger S
; Polyakov A
; Lavie P
; Lavie L
Oxid Med Cell Longev
2016[]; 2016
(ä): 9636937
PMID26635914
show ga
Previously we identified, for the first time, a new small-size subset of
neutrophil-derived giant phagocytes (G?) which spontaneously develop in vitro
without additional growth factors or cytokines. G? are
CD66b(+)/CD63(+)/MPO(+)/LC3B(+) and are characterized by extended lifespan, large
phagolysosomes, active phagocytosis, and reactive oxygen species (ROS)
production, and autophagy largely controls their formation. Hypoxia, and
particularly hypoxia/reoxygenation, is a prominent feature of many pathological
processes. Herein we investigated G? formation by applying various hypoxic
conditions. Chronic intermittent hypoxia (IH) (29 cycles/day for 5 days)
completely abolished G? formation, while acute IH had dose-dependent effects.
Exposure to 24?h (56 IH cycles) decreased their size, yield, phagocytic ability,
autophagy, mitophagy, and gp91-phox/p22-phox expression, whereas under 24?h
sustained hypoxia (SH) the size and expression of LC3B and gp91-phox/p22-phox
resembled G? formed in normoxia. Diphenyl iodide (DPI), a NADPH oxidase
inhibitor, as well as the PI3K/Akt and autophagy inhibitor LY294002 abolished G?
formation at all oxygen conditions. However, the potent antioxidant,
N-acetylcysteine (NAC) abrogated the effects of IH by inducing large
CD66b(+)/LC3B(+) G? and increased both NADPH oxidase expression and phagocytosis.
These findings suggest that NADPH oxidase, autophagy, and the PI3K/Akt pathway
are involved in G? development.