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NADPH oxidase 2 plays a role in experimental corneal neovascularization


Chan, EC and van Wijngaarden, P and Chan, E and Ngo, D and Wang, JH and Peshavariya, HM and Dusting, GJ and Liu, GS, NADPH oxidase 2 plays a role in experimental corneal neovascularization, Clinical Science, 130, (9) pp. 683-696. ISSN 0143-5221 (2016) [Refereed Article]

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Copyright 2016 Authors

DOI: doi:10.1042/CS20150103


Corneal neovascularization, the growth of new blood vessels in the cornea, is a leading cause of vision impairment after corneal injury. Neovascularization typically occurs in response to corneal injury such as that caused by infection, physical trauma, chemical burns or in the setting of corneal transplant rejection. The NADPH oxidase enzyme complex is involved in cell signalling for wound-healing angiogenesis, but its role in corneal neovascularization has not been studied. We have now analysed the role of the Nox2 isoform of NADPH oxidase in corneal neovascularization in mice following chemical injury. C57BL/6 mice aged 8-14 weeks were cauterized with an applicator coated with 75% silver nitrate and 25% potassium nitrate for 8 s. Neovascularization extending radially from limbal vessels was observed in corneal whole-mounts from cauterized wild type mice and CD31+ vessels were identified in cauterized corneal sections at day 7. In contrast, in Nox2 knockout (Nox2 KO) mice vascular endothelial growth factor-A (Vegf-A), Flt1 mRNA expression, and the extent of corneal neovascularization were all markedly reduced compared with their wild type controls. The accumulation of Iba-1+ microglia and macrophages in the cornea was significantly less in Nox2 KO than in wild type mice. In conclusion, we have demonstrated that Nox2 is implicated in the inflammatory and neovascular response to corneal chemical injury in mice and clearly VEGF is a mediator of this effect. This work raises the possibility that therapies targeting Nox2 may have potential for suppressing corneal neovascularization and inflammation in humans.

Item Details

Item Type:Refereed Article
Keywords:chemical cauterization, corneal neovascularization, NADPH oxidase, Nox2, VEGF
Research Division:Biomedical and Clinical Sciences
Research Group:Medical biotechnology
Research Field:Gene and molecular therapy
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Liu, GS (Associate Professor Guei-Sheung Liu)
ID Code:120682
Year Published:2016
Web of Science® Times Cited:14
Deposited By:Menzies Institute for Medical Research
Deposited On:2017-08-30
Last Modified:2017-11-03

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