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Neutrophil extracellular traps promote corneal neovascularization-induced by alkali burn.

Abstract：

OBJECTIVES:To investigate the effects of neutrophil extracellular traps (NETs) on angiogenesis in vitro and in vivo and the regulatory role of mammalian target of rapamycin (mTOR) activity in it. METHODS:The regulatory role of mTOR in NETs formation was explored. In vitro, human neutrophils were pretreated with rapamycin. NETs formation was measured using immunofluorescence staining of NETs markers, SYTOX Green and PicoGreen after NaOH stimulation. In vivo, mice were treated with rapamycin, and NETs formation in cornea was measured using immunofluorescence staining 7 days after alkali burn. Then, the effects of NETs on angiogenesis were investigated. In vitro, human neutrophils were treated with DNase I or rapamycin. NETs were isolated after NaOH stimulation and the isolated NETs were co-culture with human umbilical vein endothelial cells (HUVECs). HUVECs migration, proliferation, and inflammatory activation were measured. In vivo, mice were injected subconjunctivally with supernatant containing NETs. Corneal neovascularization was visualized by immunofluorescence staining. RESULTS:NETs structures can be observed in NaOH-stimulated neutrophils and alkali-burned mouse cornea compared with normal group. Treated with rapamycin enhanced NETs formation in response to NaOH management compared with DMSO control in vitro and in vivo. NETs increased the migration, proliferation and inflammatory activation of HUVECs, and subconjunctival injection of NETs promoted inflammatory and angiogenic response in corneal alkali burn model. CONCLUSIONS:NETs formation can be triggered by NaOH stimulation. mTOR activity has a negative regulatory effect on NETs formation. NETs promoted angiogenic responses and inflammatory activation of HUVECs and increased corneal neovascularization and inflammatory response.

journal_name

Int Immunopharmacol

journal_title

International immunopharmacology

authors

Yuan K,Zheng J,Huang X,Zhang Y,Han Y,Hu R,Jin X

doi

10.1016/j.intimp.2020.106902

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

106902

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(20)31726-4

journal_volume

88

pub_type

杂志文章

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