Increased expression of glial cell line-derived neurotrophic factor protects against oxidative damage-induced retinal degeneration

Aling Dong, Jikui Shen, Melissa Krause, Sean F. Hackett, Peter A Campochiaro

Research output: Contribution to journalArticle

Abstract

Oxidative damage contributes to retinal cell death in patients with age-related macular degeneration or retinitis pigmentosa. One approach to treatment is to identify and eliminate the sources of oxidative damage. Another approach is to identify treatments that protect cells from multiple sources of oxidative damage. In this study, we investigated the effect of increased expression of glial cell line-derived neurotrophic factor (GDNF) in three models of oxidative damage-induced retinal degeneration. Double transgenic mice with doxycycline-inducible expression of GDNF in the retina were exposed to paraquat, FeSO4, or hyperoxia, all sources of oxidative damage and retinal cell death. Compared to controls, mice with increased expression of GDNF in the retina showed significant preservation of retinal function measured by electroretinograms, reduced thinning of retinal cell layers, and fewer TUNEL-positive cells indicating less retinal cell death. Mice over-expressing GDNF also showed less staining for acrolein, nitrotyrosine, and 8-hydroxydeoxyguanosine, indicating less oxidative damage to lipids, proteins, and DNA. This suggests that GDNF did not act solely to allow cells to tolerate higher levels of oxidative damage before initiation of apoptosis, but also reduced damage from oxidative stress to critical macromolecules. These data suggest that gene transfer of Gdnf should be considered as a component of therapy for retinal degenerations in which oxidative damage plays a role.

Original languageEnglish (US)
Pages (from-to)1041-1052
Number of pages12
JournalJournal of Neurochemistry
Volume103
Issue number3
DOIs
StatePublished - Nov 2007

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Glial Cell Line-Derived Neurotrophic Factor
Retinal Degeneration
Cell death
Cell Death
Retina
Cells
Acrolein
Gene transfer
Hyperoxia
Paraquat
Oxidative stress
Retinitis Pigmentosa
Doxycycline
In Situ Nick-End Labeling
Macular Degeneration
Macromolecules
Transgenic Mice
Oxidative Stress
Therapeutics
Apoptosis

Keywords

  • Antioxidants
  • Apoptosis
  • Ocular gene transfer
  • Photoreceptors
  • Reactive oxygen species
  • Retinal dystrophies

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

Increased expression of glial cell line-derived neurotrophic factor protects against oxidative damage-induced retinal degeneration. / Dong, Aling; Shen, Jikui; Krause, Melissa; Hackett, Sean F.; Campochiaro, Peter A.

In: Journal of Neurochemistry, Vol. 103, No. 3, 11.2007, p. 1041-1052.

Research output: Contribution to journalArticle

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