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Updated: Aug 29, 2026
Induction and Analysis of Oxidative Stress in Sleeping Beauty Transposon-Transfected Human Retinal Pigment Epithelial Cells
Published on: December 11, 2020
Proteomic analysis of oxidative stress-resistant cells: a specific role for aldose reductase overexpression in
J Andrew Keightley1, Li Shang, Michael Kinter
1Department of Cell Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Abstract:
We are using a proteomic approach that combines two-dimensional electrophoresis and tandem mass spectrometry to detect and identify proteins that are differentially expressed in a cell line that is resistant to oxidative stress. The resistant cell line (OC14 cells) was developed previously through chronic exposure of a parent cell line (HA1 cells) to increasing hydrogen peroxide concentrations. Biochemical analyses of this system by other investigators have identified elevated content and activity of several classical antioxidant proteins that have established roles in oxidative stress resistance, but do not provide a complete explanation of this resistance. The proteomics studies described here have identified the enzyme aldose reductase (AR) as 4-fold more abundant in the resistant OC14 cells than in the HA1 controls. Based on this observation, the role of AR in the resistant phenotype was investigated by using a combination of AR induction with ethoxyquin and AR inhibition with Alrestatin to test the cytotoxicity of two oxidation-derived aldehydes: acrolein and glycolaldehyde. The results show that AR induction in HA1 cells provides protection against both acrolein- and glycolaldehyde-induced cytotoxicity. Furthermore, glutathione depletion sensitizes the cells to the acrolein-induced toxicity, but not the glycolaldehyde-induced toxicity, while AR inhibition sensitizes the cells to both acrolein- and glycolaldehyde-induced. These observations are consistent with a significant role for AR in the oxidative stress-resistant phenotype. These studies also illustrate the productive use of proteomic methods to investigate the molecular mechanisms of oxidative stress.
Insights
Proteomics identified aldose reductase (AR) as key in oxidative stress resistance. Inducing AR protected cells from toxic aldehydes, revealing its significant role in cellular defense mechanisms.
Area of Science:
- Biochemistry
- Cell Biology
- Proteomics
Background:
- Oxidative stress resistance is crucial for cell survival.
- Classical antioxidant proteins partially explain resistance but not fully.
- A resistant cell line (OC14) was developed from parent cells (HA1) via hydrogen peroxide exposure.
Purpose of the Study:
- To identify proteins differentially expressed in an oxidative stress-resistant cell line using proteomics.
- To investigate the role of identified proteins, specifically aldose reductase (AR), in the resistant phenotype.
Main Methods:
- Proteomic analysis using two-dimensional electrophoresis and tandem mass spectrometry.
- Development of an oxidative stress-resistant cell line (OC14).
- Experimental manipulation of aldose reductase (AR) activity via induction (ethoxyquin) and inhibition (Alrestatin).
Main Results:
- Aldose reductase (AR) was found to be 4-fold more abundant in resistant OC14 cells compared to HA1 cells.
- AR induction in HA1 cells conferred protection against acrolein and glycolaldehyde cytotoxicity.
- AR inhibition sensitized cells to both acrolein and glycolaldehyde toxicity, while glutathione depletion affected only acrolein toxicity.
Conclusions:
- Aldose reductase (AR) plays a significant role in the oxidative stress-resistant phenotype.
- Proteomic methods are effective for uncovering molecular mechanisms of oxidative stress resistance.
- Findings provide a deeper understanding of cellular defense against oxidative damage.
