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Role of Glutathione Peroxidase 4 in Corneal Endothelial Cells
Takatoshi Uchida1,2, Osamu Sakai2, Hirotaka Imai3
1a Department of Ophthalmology, Graduate School of Medicine and Faculty of Medicine , The University of Tokyo , Tokyo , Japan.
Purpose:
To investigate the role of glutathione peroxidase 4 (GPx4) in corneal endothelial cells.
Materials And Methods:
An immortalized human corneal endothelial cell line was used. Cells were transfected with either siRNA specifically silencing GPx4 or scrambled control siRNA. Knockdown was confirmed by Real-time RT-PCR and immunoblotting. Lipid peroxidation was evaluated by 4-hydroxy-2-nonenal immunostaining. Cytotoxicity, cell death, and cell proliferation were evaluated using a lactate dehydrogenase (LDH) activity assay, Annexin V staining, and WST-8, respectively. Furthermore, cells transfected with GPx4 siRNA or control siRNA were treated with hydrogen peroxide or ferrous sulfate, and cytotoxicity was evaluated using the LDH activity assay.
Results:
The treatment of siRNA decreased the expression of GPx4 at both mRNA and protein levels. The knockdown of GPx4 significantly increased the levels of lipid oxidation and LDH activity. Annexin V-positive cells increased in GPx4 siRNA-treated cells. The proliferation of GPx4 siRNA-treated cells was downregulated compared with that of control siRNA-treated cells. GPx4 knockdown enhanced hydrogen peroxide- and ferrous sulfate-induced cytotoxicity.
Conclusion:
These results suggest that GPx4 is an important antioxidant enzyme for maintaining redox status and protecting corneal endothelial cells from oxidative stress.
Insights
Glutathione peroxidase 4 (GPx4) is crucial for corneal endothelial cells, acting as an antioxidant enzyme. Its depletion increases oxidative stress and cell damage, highlighting its protective role.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Corneal endothelial cells (CECs) are vital for maintaining corneal transparency and function.
- Oxidative stress is implicated in CEC dysfunction and various ocular diseases.
- The specific role of glutathione peroxidase 4 (GPx4) in CECs requires further elucidation.
Purpose of the Study:
- To investigate the function of glutathione peroxidase 4 (GPx4) in human corneal endothelial cells.
- To determine the impact of GPx4 deficiency on cellular redox homeostasis and survival.
Main Methods:
- Utilized an immortalized human CEC line, employing siRNA to specifically silence GPx4 expression.
- Confirmed GPx4 knockdown via Real-time RT-PCR and immunoblotting.
- Assessed lipid peroxidation, cytotoxicity (LDH assay), apoptosis (Annexin V), and proliferation (WST-8 assay).
Main Results:
- GPx4 knockdown significantly increased lipid peroxidation and lactate dehydrogenase (LDH) activity.
- An increase in Annexin V-positive cells indicated elevated apoptosis following GPx4 silencing.
- GPx4 knockdown exacerbated cytotoxicity induced by hydrogen peroxide and ferrous sulfate.
Conclusions:
- GPx4 functions as a critical antioxidant enzyme in corneal endothelial cells.
- Maintaining GPx4 expression is essential for preserving cellular redox balance and protecting CECs against oxidative damage.
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