Primary Human Trabecular Meshwork Model for Pseudoexfoliation

Area of Science:

• Ophthalmology
• Cell Biology
• Molecular Biology

Background:

• Pseudoexfoliation syndrome (PXF) is an age-related fibrillopathy leading to glaucoma.
• Current research is limited by the absence of suitable animal or in vitro models for studying PXF's molecular events.
• Developing a reliable in vitro model is crucial for understanding PXF pathogenesis and trabecular meshwork damage.

Purpose of the Study:

• To establish a functional in vitro model of PXF using primary human trabecular meshwork (HTM) cells.
• To simulate the molecular and cellular changes characteristic of human PXF disease.
• To investigate the role of transforming growth factor-beta1 (TGF-β1) in PXF development.

Main Methods:

• Primary HTM cells from healthy donors were treated with varying concentrations of TGF-β1.
• Epithelial-mesenchymal transition (EMT) was assessed via microscopy and immunoblotting.
• Pro-fibrotic marker expression was quantified using RT-PCR and immunoblotting.
• Cell viability, aggregate formation, and pathway involvement were analyzed.

Main Results:

• TGF-β1 exposure (10 ng/mL at 48-72h) significantly upregulated pro-fibrotic markers and induced EMT.
• Protein aggregates, characteristic of PXF, were observed around the nucleus and in the extracellular matrix.
• TGF-β1 pathways (canonical and non-canonical) showed complex regulatory effects on EMT and pro-fibrotic markers.

Conclusions:

• The developed HTM cell-based in vitro model successfully replicates key features of human PXF.
• This model provides a valuable tool for studying PXF pathogenesis, including pro-fibrotic gene expression, EMT, and aggregate formation.
• Further research using this model can explore therapeutic strategies for PXF-associated glaucoma.