Abstract:
PURPOSE:To determine the molecular mechanisms underlying the protective effects of zinc against oxidative stress in cultured retinal pigment epithelial (RPE) cells. METHODS:Cultured ARPE-19 cells were treated with different concentrations of zinc for various times. Cellular glutathione (GSH) and glutathione disulfide (GSSG) levels were measured by high-performance liquid chromatography (HPLC). Glutamate-cysteine ligase (GCL) expression was measured by quantitative reverse transcription-PCR (RT-PCR). Nuclear factor erythroid2-related factor (Nrf2) activity was measured in a dual luciferase assay after transfection of reporter plasmids containing the antioxidant response element (ARE). The small interference (si)RNA approach was used to knock down the expression of Nrf2. RESULTS:Zinc significantly increased GSH levels in ARPE-19 cells through induction of the de novo synthesis pathway. At 150 microM, zinc increased the GSH level by 70%. At similar concentrations, zinc upregulated the mRNA level of GCL and activated the ARE-Nrf2 pathway. The effects of zinc on ARE activation and GSH synthesis were inhibited by knockdown of Nrf2 expression using the siRNA approach. CONCLUSIONS:Induction of the ARE-Nrf2 pathway by zinc provides powerful and prolonged antioxidation and detoxification that may explain the beneficial effects of zinc observed in the treatment of age-related macular degeneration (AMD).
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Ha KN,Chen Y,Cai J,Sternberg P Jrdoi
10.1167/iovs.05-1322subject
Has Abstractpub_date
2006-06-01 00:00:00pages
2709-15issue
6eissn
0146-0404issn
1552-5783pii
47/6/2709journal_volume
47pub_type
杂志文章abstract:PURPOSE:Retinal neovascularization is one of the leading causes of blindness. A crucial event in this process is the remodeling and penetration of the capillary basement membrane by migrating endothelial cells. This process requires proteolysis of basement membrane components by a variety of proteinases. The objective ...
journal_title:Investigative ophthalmology & visual science
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doi:
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abstract::Checkerboard reversal stimuli were used to evoke transient pattern electroretinograms (P-ERGs) from the eyes of 14 patients with amblyopia and 14 normal subjects. In the control group, and in normal eyes of patients, pattern electroretinograms were obtained with monocular central fixation. Amblyopic eyes were examined...
journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
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abstract:PURPOSE:To describe the age-, gender-, and cause-specific 5-year incidence of bilateral visual impairment in participants in the Melbourne Visual Impairment Project, Victoria, Australia. METHODS:Participants aged 40 years and older were recruited from Melbourne, Victoria, Australia, by random cluster sampling. The mea...
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1990-11-01 00:00:00
abstract::Horseradish peroxidase has been injected into the dorsal lateral geniculate nucleus of macaque monkeys to label ganglion cells of the retina by retrograde axoplasmic transport. Displaced ganglion cells, with somata in the inner nuclear layer and dendrites in the inner plexiform layer, were detected by virtue of their ...
journal_title:Investigative ophthalmology & visual science
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doi:
更新日期:1977-01-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2010-12-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
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更新日期:2012-11-01 00:00:00
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更新日期:2012-03-09 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2017-01-01 00:00:00
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更新日期:2011-06-16 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1983-02-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:2001-11-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:
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更新日期:2009-09-01 00:00:00
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更新日期:2010-11-01 00:00:00
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doi:
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更新日期:2016-07-01 00:00:00
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更新日期:2015-09-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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