Journal List > J Korean Ophthalmol Soc > v.54(3) > 1009626

Kim, Kang, and Lee: Effect of Ascorbic Acid Against the Oxidative Stress-Induced Cellular Senescence in Trabecular Meshwork Cells

Abstract

Purpose

To investigate the effect of L-ascorbic acid (LAA) on oxidative-stress-induced cellular senescence in trabecular meshwork (TM) cells.

Methods

Primarily cultured human TM cells were exposed to 0, 10, or 100 μM hydrogen peroxide for 7 days with or without co-exposure of LAA. Cellular survival and nitrite production were assessed with MTT and Griess assays, respectively. SA-β-gal staining was performed to quantify cellular senescence.

Results

Hydrogen peroxide decreased cellular survival, accompanied by decreased nitric oxide (NO) production. These decreases of cellular survival and NO production were abolished by co-exposure of 100 μM LAA. Analysis of SA-β-gal staining revealed that LAA inhibited hydrogen peroxide-induced cellular senescence by 6.8% (p < 0.05).

Conclusions

LAA may have a protective effect against the oxidative-stress-induced cellular senescence in TM cells.

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Figure 1.
Effect of hydrogen peroxide on the survival of human trabecular meshwork cells. Exposure to 100 μM hydrogen peroxide decreased cellular proliferation significantly compared to non-exposed control (*p < 0.05).
jkos-54-490f1.tif
Figure 2.
Effect of L-ascorbic acid on the survival of human trabecular meshwork cells against the hydrogen peroxide-induced oxidative stress. 100 μM hydrogen peroxide decreased cellular survival significantly (*p < 0.05) which were abolished by L-ascorbic acid (p > 0.05).
jkos-54-490f2.tif
Figure 3.
Effect of hydrogen peroxide on the production of nitric oxide (NO) in primarily cultured human trabecular meshwork cells. Exposure to 100 μM hydrogen peroxide decreased production of NO significantly compared to non-exposed control (*p < 0.05).
jkos-54-490f3.tif
Figure 4.
Effect of L-ascorbic acid on the production of nitric oxide (NO) in human trabecular meshwork cells against the hydrogen peroxide-induced oxidative stress. L-ascorbic acid increased production of NO compared to non-exposed control (*p < 0.05).
jkos-54-490f4.tif
Figure 5.
Senescence-associated β-galactosidase staining of trabecular meshwork cells after exposure to hydrogen peroxide. 100 μM hydrogen peroxide increased the number of senescent cells, which stained blue (B), compared to non-exposed control (A) (Magnification, ×100).
jkos-54-490f5.tif
Figure 6.
Effect of L-ascorbic acid on the oxidative stress-induced senescence of human trabecular meshwork cells. 100 μM L-ascorbic acid decreased cellular senescence (*p < 0.05).
jkos-54-490f6.tif
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