Demonstration by redox fluorometry that sulforaphane protects retinal pigment epithelial cells against oxidative stress

Marisol Del V Cano, Johann M. Reyes, Choul Y. Park, Xiangqun Gao, Keisuke Mori, Roy S. Chuck, Peter L. Gehlbach

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

PURPOSE. To quantify the effects of oxidant challenge on the redox state of adult human retinal pigment epithelial cells using microscopic autofluorescence spectroscopy and to determine whether treatment with the isothiocyanate sulforaphane protects these cells against oxidative stress. METHODS. Oxidative stress was evoked in ARPE-19 cells by H2O2 and tert-butyl hydroperoxide. Reduced nicotinamide nucleotides NAD(P)H were assessed by excitation at 366 nm with measurement of fluorescence at 450 nm. Oxidized flavoproteins were assessed by excitation at 460 nm with measurement of fluorescence at 540 nm. The ratio of these measurements served as the index of cellular redox status. RESULTS. Redox ratio and cell viability decreased in a dose-dependent manner after oxidant exposure. ARPE-19 cells treated with sulforaphane maintained significantly higher redox ratio and cell viability. The ratio for sulforaphane-treated cells after exposure to 0.64 mM H 2O2 was 2.64 ± 0.19 compared with 1.77 ± 0.16 in untreated cells (P = 0.001). At 1.2 mM H2O2, the redox ratio of sulforaphane-treated cells was 2.30 ± 0.18 compared with 1.76 ± 0.13 in untreated cells (P = 0.02). Similar results were observed after insult with tert-butyl hydroperoxide. CONCLUSIONS. Redox fluorometry provides quantitative information on the redox status of living cells. Sulforaphane protects ARPE-19 cells from oxidative injury by induction of antioxidant phase 2 genes. The findings in this study describe a useful method for assessing antioxidant effects in live cells and support phase 2 gene induction as a potential treatment strategy for macular degeneration and diseases in which oxidative injury plays a causative role.

Original languageEnglish (US)
Pages (from-to)2606-2612
Number of pages7
JournalInvestigative Ophthalmology and Visual Science
Volume49
Issue number6
DOIs
StatePublished - Jun 2008
Externally publishedYes

Fingerprint

Fluorometry
Retinal Pigments
Oxidation-Reduction
Oxidative Stress
Epithelial Cells
tert-Butylhydroperoxide
Oxidants
Cell Survival
Antioxidants
Fluorescence
sulforafan
Flavoproteins
Niacinamide
Wounds and Injuries
Macular Degeneration
NAD
Genes
Spectrum Analysis
Nucleotides

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Demonstration by redox fluorometry that sulforaphane protects retinal pigment epithelial cells against oxidative stress. / Cano, Marisol Del V; Reyes, Johann M.; Park, Choul Y.; Gao, Xiangqun; Mori, Keisuke; Chuck, Roy S.; Gehlbach, Peter L.

In: Investigative Ophthalmology and Visual Science, Vol. 49, No. 6, 06.2008, p. 2606-2612.

Research output: Contribution to journalArticle

Cano, Marisol Del V ; Reyes, Johann M. ; Park, Choul Y. ; Gao, Xiangqun ; Mori, Keisuke ; Chuck, Roy S. ; Gehlbach, Peter L. / Demonstration by redox fluorometry that sulforaphane protects retinal pigment epithelial cells against oxidative stress. In: Investigative Ophthalmology and Visual Science. 2008 ; Vol. 49, No. 6. pp. 2606-2612.
@article{36c70afe5af14d0da7fbb3694030093f,
title = "Demonstration by redox fluorometry that sulforaphane protects retinal pigment epithelial cells against oxidative stress",
abstract = "PURPOSE. To quantify the effects of oxidant challenge on the redox state of adult human retinal pigment epithelial cells using microscopic autofluorescence spectroscopy and to determine whether treatment with the isothiocyanate sulforaphane protects these cells against oxidative stress. METHODS. Oxidative stress was evoked in ARPE-19 cells by H2O2 and tert-butyl hydroperoxide. Reduced nicotinamide nucleotides NAD(P)H were assessed by excitation at 366 nm with measurement of fluorescence at 450 nm. Oxidized flavoproteins were assessed by excitation at 460 nm with measurement of fluorescence at 540 nm. The ratio of these measurements served as the index of cellular redox status. RESULTS. Redox ratio and cell viability decreased in a dose-dependent manner after oxidant exposure. ARPE-19 cells treated with sulforaphane maintained significantly higher redox ratio and cell viability. The ratio for sulforaphane-treated cells after exposure to 0.64 mM H 2O2 was 2.64 ± 0.19 compared with 1.77 ± 0.16 in untreated cells (P = 0.001). At 1.2 mM H2O2, the redox ratio of sulforaphane-treated cells was 2.30 ± 0.18 compared with 1.76 ± 0.13 in untreated cells (P = 0.02). Similar results were observed after insult with tert-butyl hydroperoxide. CONCLUSIONS. Redox fluorometry provides quantitative information on the redox status of living cells. Sulforaphane protects ARPE-19 cells from oxidative injury by induction of antioxidant phase 2 genes. The findings in this study describe a useful method for assessing antioxidant effects in live cells and support phase 2 gene induction as a potential treatment strategy for macular degeneration and diseases in which oxidative injury plays a causative role.",
author = "Cano, {Marisol Del V} and Reyes, {Johann M.} and Park, {Choul Y.} and Xiangqun Gao and Keisuke Mori and Chuck, {Roy S.} and Gehlbach, {Peter L.}",
year = "2008",
month = "6",
doi = "10.1167/iovs.07-0960",
language = "English (US)",
volume = "49",
pages = "2606--2612",
journal = "Investigative Ophthalmology and Visual Science",
issn = "0146-0404",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "6",

}

TY - JOUR

T1 - Demonstration by redox fluorometry that sulforaphane protects retinal pigment epithelial cells against oxidative stress

AU - Cano, Marisol Del V

AU - Reyes, Johann M.

AU - Park, Choul Y.

AU - Gao, Xiangqun

AU - Mori, Keisuke

AU - Chuck, Roy S.

AU - Gehlbach, Peter L.

PY - 2008/6

Y1 - 2008/6

N2 - PURPOSE. To quantify the effects of oxidant challenge on the redox state of adult human retinal pigment epithelial cells using microscopic autofluorescence spectroscopy and to determine whether treatment with the isothiocyanate sulforaphane protects these cells against oxidative stress. METHODS. Oxidative stress was evoked in ARPE-19 cells by H2O2 and tert-butyl hydroperoxide. Reduced nicotinamide nucleotides NAD(P)H were assessed by excitation at 366 nm with measurement of fluorescence at 450 nm. Oxidized flavoproteins were assessed by excitation at 460 nm with measurement of fluorescence at 540 nm. The ratio of these measurements served as the index of cellular redox status. RESULTS. Redox ratio and cell viability decreased in a dose-dependent manner after oxidant exposure. ARPE-19 cells treated with sulforaphane maintained significantly higher redox ratio and cell viability. The ratio for sulforaphane-treated cells after exposure to 0.64 mM H 2O2 was 2.64 ± 0.19 compared with 1.77 ± 0.16 in untreated cells (P = 0.001). At 1.2 mM H2O2, the redox ratio of sulforaphane-treated cells was 2.30 ± 0.18 compared with 1.76 ± 0.13 in untreated cells (P = 0.02). Similar results were observed after insult with tert-butyl hydroperoxide. CONCLUSIONS. Redox fluorometry provides quantitative information on the redox status of living cells. Sulforaphane protects ARPE-19 cells from oxidative injury by induction of antioxidant phase 2 genes. The findings in this study describe a useful method for assessing antioxidant effects in live cells and support phase 2 gene induction as a potential treatment strategy for macular degeneration and diseases in which oxidative injury plays a causative role.

AB - PURPOSE. To quantify the effects of oxidant challenge on the redox state of adult human retinal pigment epithelial cells using microscopic autofluorescence spectroscopy and to determine whether treatment with the isothiocyanate sulforaphane protects these cells against oxidative stress. METHODS. Oxidative stress was evoked in ARPE-19 cells by H2O2 and tert-butyl hydroperoxide. Reduced nicotinamide nucleotides NAD(P)H were assessed by excitation at 366 nm with measurement of fluorescence at 450 nm. Oxidized flavoproteins were assessed by excitation at 460 nm with measurement of fluorescence at 540 nm. The ratio of these measurements served as the index of cellular redox status. RESULTS. Redox ratio and cell viability decreased in a dose-dependent manner after oxidant exposure. ARPE-19 cells treated with sulforaphane maintained significantly higher redox ratio and cell viability. The ratio for sulforaphane-treated cells after exposure to 0.64 mM H 2O2 was 2.64 ± 0.19 compared with 1.77 ± 0.16 in untreated cells (P = 0.001). At 1.2 mM H2O2, the redox ratio of sulforaphane-treated cells was 2.30 ± 0.18 compared with 1.76 ± 0.13 in untreated cells (P = 0.02). Similar results were observed after insult with tert-butyl hydroperoxide. CONCLUSIONS. Redox fluorometry provides quantitative information on the redox status of living cells. Sulforaphane protects ARPE-19 cells from oxidative injury by induction of antioxidant phase 2 genes. The findings in this study describe a useful method for assessing antioxidant effects in live cells and support phase 2 gene induction as a potential treatment strategy for macular degeneration and diseases in which oxidative injury plays a causative role.

UR - http://www.scopus.com/inward/record.url?scp=47249120767&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=47249120767&partnerID=8YFLogxK

U2 - 10.1167/iovs.07-0960

DO - 10.1167/iovs.07-0960

M3 - Article

C2 - 18515589

AN - SCOPUS:47249120767

VL - 49

SP - 2606

EP - 2612

JO - Investigative Ophthalmology and Visual Science

JF - Investigative Ophthalmology and Visual Science

SN - 0146-0404

IS - 6

ER -