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Author Spotlight: Understanding Retinal Vessel Resilience and Disease Progression
Published on: January 12, 2024
Apoptotic effect of mtrix metalloproteinases 9 in the development of diabetic retinopathy
1Department of Ophthamology, Second Xiangya Hospital Central South University Changsha 410013, Hunan, China ; Department of Ophthamology, Third Xiangya Hospital Central South University Changsha 410013, Hunan, China.
Objective:
To explore the potential regulatory mechanism of MMP9 in the development of DR.
Methods:
Plasmids pcDNA-MMP9 and pcDNA-Ang2 were transfected into primary rat retinal Müller cells (RMCs) using Lipofectamine 2000. Cell viability and apoptosis were respectively determined by MTT assay and flow cytometry. Moreover, the interaction between MMP9 and Ang2 was explored. Besides, RMCs were treated with MMP-9 under normal glucose and high glucose condition for 2d. Besides, the expression levels of apoptotic proteins, like MMP9, Ang2, Bax2, Bcl2, cleaved PARP and cleaved caspase3 were determined by Western blot.
Results:
The cell viability of siRNA-MMP9 group was significantly increased while decreased in MMP9 overexpression group when compared to control group, respectively. The apoptotic cells in MMP9 overexpression group significantly increased while decreased in siRNA-MMP9 group when compared with control group. MMP9 expression was significantly regulated by Ang2 whereas no significant changes occurred in Ang2 expression when MMP9 expression changed. Moreover, MMP9 expression in HG group significantly increased while there were no significant differences between NG group and control group. Besides, the expression of Bax2, Bcl2, cleaved PARP and cleaved caspase3 in HG group increased while there were no significant differences between NG group and control group.
Conclusion:
Our findings indicate that MMP9 may play an important role via inducing cell apoptosis in the development of DR via regulating by Ang2 or targeting apoptotic proteins, such as Bax2, Bcl2, cleaved PARP and cleaved caspase3.
Insights
Matrix metalloproteinase 9 (MMP9) is implicated in diabetic retinopathy (DR) development. Angiopoietin-2 (Ang2) regulates MMP9, which induces Müller cell apoptosis, contributing to DR progression.
Area of Science:
- Ophthalmology
- Molecular Biology
- Cell Biology
Background:
- Diabetic retinopathy (DR) is a leading cause of vision loss.
- The molecular mechanisms underlying DR pathogenesis require further elucidation.
- Matrix metalloproteinase 9 (MMP9) is a potential factor in DR development.
Purpose of the Study:
- To investigate the regulatory role of MMP9 in diabetic retinopathy (DR).
- To explore the interaction between MMP9 and Angiopoietin-2 (Ang2) in retinal Müller cells.
- To determine the effect of MMP9 on Müller cell apoptosis under high glucose conditions.
Main Methods:
- Primary rat retinal Müller cells (RMCs) were transfected with MMP9 and Ang2 plasmids.
- Cell viability and apoptosis were assessed using MTT assay and flow cytometry.
- Western blot analysis was performed to evaluate apoptotic protein expression.
Main Results:
- MMP9 overexpression increased RMC apoptosis, while MMP9 knockdown enhanced cell viability.
- Ang2 significantly regulated MMP9 expression.
- High glucose conditions upregulated MMP9 and apoptotic protein expression in RMCs.
Conclusions:
- MMP9 plays a critical role in DR pathogenesis by inducing Müller cell apoptosis.
- Ang2 is involved in the regulation of MMP9 in the context of DR.
- Targeting MMP9 and associated apoptotic pathways may offer therapeutic strategies for DR.
