Astroglial NF-κB mediates oxidative stress by regulation of NADPH oxidase in a model of retinal ischemia reperfusion injury

David J. Barakat, Galina Dvoriantchikova, Dmitry Ivanov, Valery I. Shestopalov

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Astrocytes undergo rapid activation after injury, which is mediated in part by the transcription factor nuclear factor-kappaB (NF-κB). Consequently, activated astrocytes have been shown to induce the NF-κB regulated phagocyte NADPH oxidase (PHOX), resulting in elevated production of reactive oxygen species. We investigated the regulatory mechanisms of PHOX-induced oxidative stress in astrocytes and its non-cell-autonomous effects on retinal ganglion cell loss following retinal ischemia-reperfusion (IR) injury. To study PHOX activity and neurotoxicity mediated by glial NF-κB, we employed GFAP-IκBα-dn transgenic mice, where the NF-κB canonical pathway is suppressed specifically in astrocytes. Our analysis showed that NF-κB activation in astrocytes correlated with an increased expression of PHOX and reactive oxygen species production in primary cells and whole retinas subjected to oxygen-glucose deprivation or IR injury. Selective blockade of NF-κB in astrocytes or application of NADPH oxidase inhibitors suppressed retinal ganglion cell loss in co-cultures with astroglia challenged by oxygen-glucose deprivation. Furthermore, genetic suppression of astroglial NF-κB reduced oxidative stress in ganglion layer neurons in vivo in retinal IR. Collectively, our results suggest that astroglial NF-κB-regulated PHOX activity is a crucial toxicity pathway in the pathogenesis of retinal IR injury.

Original languageEnglish (US)
Pages (from-to)586-597
Number of pages12
JournalJournal of neurochemistry
Volume120
Issue number4
DOIs
StatePublished - Feb 2012

Keywords

  • astrocyte
  • ischemia
  • NADPH oxidase
  • NF-κB
  • oxidative stress

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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