Autophagy Mediates MMP-2 Expression in Glaucomatous Trabecular Meshwork Cells

Area of Science:

• Ophthalmology
• Cell Biology
• Molecular Biology

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• Matrix metalloproteinase-2 (MMP-2) plays a role in extracellular matrix remodeling, implicated in POAG pathogenesis.
• Autophagy, a cellular degradation process, is increasingly recognized for its role in ocular diseases.

Purpose of the Study:

• To investigate the impact of 3-methyladenine (3-MA), an autophagy inhibitor, and starvation, an autophagy inducer, on MMP-2 expression in primary trabecular meshwork (TM) cells.
• To elucidate the relationship between autophagy modulation and MMP-2 levels in the context of POAG.

Main Methods:

• Primary TM cells were subjected to starvation (nutrient depletion) or treated with varying concentrations of 3-MA.
• Autophagy levels were assessed via monodansylcadaverine staining and expression of autophagy markers (LC3, Beclin1).
• MMP-2 mRNA and protein expression were quantified using RT-PCR and Western blot, respectively. Cell proliferation was assessed using MTT assay.

Main Results:

• Starvation significantly upregulated autophagy markers (LC3-II, Beclin1) and downregulated MMP-2 expression in TM cells.
• 3-MA treatment suppressed autophagy activation, leading to increased MMP-2 expression, particularly at 5 mM concentration.
• Cell proliferation was not significantly affected by the treatments within the tested parameters.

Conclusions:

• Autophagy modulation influences MMP-2 expression in TM cells, suggesting a potential role in POAG pathogenesis.
• Targeting autophagy pathways may offer a novel therapeutic strategy for managing MMP-2 dysregulation in POAG.
• Further research is warranted to fully understand the complex interplay between autophagy, MMP-2, and extracellular matrix deposition in POAG.