Synergistic Cytokine Signaling Drives Angiofibrotic Gene Pathways in Primary Human Retinal Endothelial Cells

Area of Science:

• Ophthalmology
• Molecular Biology
• Genomics

Background:

• Posterior eye neovascularization, a driver of vision loss in AMD and PDR, involves inflammation, angiogenesis, and fibrosis.
• Mechanisms of retinal endothelial cell (EC) dysregulation in neovascularization and fibrosis remain poorly understood.

Purpose of the Study:

• To investigate the transcriptomic changes in human microvascular retinal ECs exposed to specific neovascularization-associated signaling molecules.
• To identify key molecular pathways and genes involved in retinal EC dysfunction.

Main Methods:

• Primary human microvascular retinal ECs were treated with individual and combined signaling molecules (IL-6, TNF-α, TGF-β1, TGF-β2, thrombin, VEGF-A).
• Transcriptomic analysis was performed, and gene expression data was analyzed using the GeneBunny network-based engine.
• Gene expression profiles were compared to published transcriptomes from AMD patient tissues.

Main Results:

• Individual treatments with TNF-α, thrombin, and TGF-β2 significantly activated inflammatory and angiofibrotic pathways (PI3K/Akt, NF-κB, SMAD).
• Co-treatment with all six ligands induced 889 unique differentially expressed genes, significantly enhancing pathological pathways.
• The combined treatment group's transcriptome more closely resembled AMD patient ECs than individual treatment groups.

Conclusions:

• Key signaling molecules synergistically drive retinal EC dysfunction, mimicking pathological changes seen in AMD.
• This study provides a detailed molecular characterization of neovascularization and fibrosis in retinal ECs.
• Identified molecular players and pathways offer potential targets for novel anti-fibrotic therapies in ophthalmology.