[Effect of glucose regulated protein 78 gene silencing on hyperoxia-induced apoptosis in alveolar epithelial cells]
Hongyan Lu1, Chuchu Gao1, Wei Tang1
1Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang 212000, China.
Objective:
To investigate the effect and possible mechanism of small interfering RNA (siRNA)-mediated glucose regulated protein 78 (GRP78) gene silencing on hyperoxia-induced apoptosis of alveolar epithelial cells.
Methods:
Human lung adenocarcinoma A549 cells in vitro were transfected with siRNA by Lipofectamine(TM)2000. Cells were divided into untransfected group, scrambled siRNA group and GRP78-siRNA group. A model of hyperoxia-induced cell injury was established by 95% oxygen. After 48 hours, the mRNA and protein levels of GRP78 and C/EBP homologous protein (CHOP) were detected respectively by real-time PCR and Western blotting, and cell apoptosis was measured by flow cytometry.
Results:
By GRP78 siRNA interference, the mRNA and protein levels of GRP78 decreased significantly, while CHOP increased significantly. The apoptosis rate of A549 cells was elevated significantly.
Conclusion:
GRP78 gene silencing may enhance the CHOP apoptotic pathway and promote apoptosis in alveolar epithelial cells induced by hyperoxia, suggesting the potential value of GRP78 as a therapeutic target for the clinical treatment of bronchopulmonary dysplasia.
Insights
Small interfering RNA (siRNA) targeting glucose-regulated protein 78 (GRP78) gene silencing enhanced apoptosis in alveolar epithelial cells. This suggests GRP78 may be a therapeutic target for bronchopulmonary dysplasia.
Area of Science:
- Cell Biology
- Molecular Medicine
- Respiratory Medicine
Background:
- Hyperoxia exposure can induce apoptosis in alveolar epithelial cells, a key process in lung injury.
- Glucose-regulated protein 78 (GRP78) plays a role in cellular stress responses.
- Understanding GRP78's role in hyperoxia-induced apoptosis is crucial for developing treatments for lung diseases.
Purpose of the Study:
- To investigate the effect of GRP78 gene silencing on hyperoxia-induced apoptosis in alveolar epithelial cells.
- To explore the underlying mechanism involving the C/EBP homologous protein (CHOP) pathway.
- To assess the potential of GRP78 as a therapeutic target.
Main Methods:
- Human lung adenocarcinoma A549 cells were transfected with GRP78-specific siRNA.
- A hyperoxia model was established using 95% oxygen exposure for 48 hours.
- Gene silencing effects were analyzed by measuring GRP78 and CHOP mRNA and protein levels, and apoptosis rates were quantified via flow cytometry.
Main Results:
- GRP78 gene silencing significantly reduced GRP78 mRNA and protein levels.
- C/EBP homologous protein (CHOP) levels were significantly increased following GRP78 silencing.
- Hyperoxia-induced apoptosis in A549 cells was significantly elevated.
Conclusions:
- GRP78 gene silencing promotes apoptosis in alveolar epithelial cells under hyperoxia.
- The mechanism involves the enhancement of the CHOP apoptotic pathway.
- GRP78 represents a potential therapeutic target for bronchopulmonary dysplasia.
