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miR-17-3p Exacerbates Oxidative Damage in Human Retinal Pigment Epithelial Cells
Bo Tian1,2, Daniel E Maidana1, Bernard Dib1
1Retina Service, Angiogenesis Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, United States of America.
Abstract:
Oxidative stress has been shown to contribute to the development of age-related macular degeneration (AMD). MicroRNAs (miRNA) are small non-coding RNA molecules that function in RNA silencing and post-transcriptional regulation of gene expression. We showed miR-17-3p to be elevated in macular RPE cells from AMD patients and in ARPE-19 cells under oxidative stress. Transfection of miR-17-3p mimic in ARPE-19 induced cell death and exacerbated oxidative lethality that was alleviated by miR-17-3p inhibitor. The expression of antioxidant enzymes manganese superoxide dismutase (MnSOD) and thioredoxin reductase-2 (TrxR2) were suppressed by miR-17-3p mimic and reversed by miR-17-3p inhibitor. These results suggest miR-17-3p aggravates oxidative damage-induced cell death in human RPE cells, while miR-17-3p inhibitor acts as a potential protector against oxidative stress by regulating the expression of antioxidant enzymes.
Insights
MicroRNA-17-3p (miR-17-3p) worsens oxidative stress in eye cells, contributing to age-related macular degeneration. Inhibiting miR-17-3p may protect against this damage by regulating antioxidant enzymes.
Area of Science:
- Ophthalmology
- Molecular Biology
- Genetics
Background:
- Oxidative stress is implicated in age-related macular degeneration (AMD) pathogenesis.
- MicroRNAs (miRNAs) regulate gene expression and are involved in cellular processes.
- Elevated miR-17-3p levels are observed in AMD patient macular cells and under oxidative stress conditions.
Purpose of the Study:
- To investigate the role of miR-17-3p in oxidative stress-induced cell death in retinal pigment epithelium (RPE) cells.
- To determine if miR-17-3p influences the expression of key antioxidant enzymes.
Main Methods:
- Utilized ARPE-19 cells, a human RPE cell line.
- Employed miR-17-3p mimic and inhibitor transfections.
- Assessed cell viability under oxidative stress conditions.
- Quantified the expression levels of manganese superoxide dismutase (MnSOD) and thioredoxin reductase-2 (TrxR2).
Main Results:
- miR-17-3p mimic transfection induced cell death and worsened oxidative stress lethality in ARPE-19 cells.
- miR-17-3p inhibitor alleviated oxidative stress-induced cell death.
- miR-17-3p mimic suppressed MnSOD and TrxR2 expression, while the inhibitor reversed this suppression.
Conclusions:
- miR-17-3p exacerbates oxidative damage-induced cell death in human RPE cells.
- miR-17-3p inhibition shows potential as a protective strategy against oxidative stress in AMD by modulating antioxidant enzyme expression.
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