SDF1-alpha is associated with VEGFR-2 in human choroidal neovascularisation

Area of Science:

• Ophthalmology
• Cell Biology
• Immunology

Background:

• Endothelial progenitor cells (EPCs) are implicated in choroidal neovascularisation (CNV).
• EPC recruitment relies on stromal cell derived factor 1-alpha (SDF) and its receptor CXCR4.

Purpose of the Study:

• To investigate the presence and distribution of SDF and CXCR4 in human CNV specimens.
• To determine the potential role of the SDF/CXCR4 pathway in neovascularisation.

Main Methods:

• Immunohistochemistry was performed on 23 CNV specimens from various aetiologies.
• Antibodies used included SDF, CXCR4, VEGFR-2, CD34, CD68, and cytokeratins.

Main Results:

• SDF was detected in multiple CNV specimens, with significant association with VEGFR-2 and RPE localisation.
• CXCR4 immunostaining was widespread across all specimens.
• A significant association was found between SDF and VEGFR-2 immunostaining (p<0.001) and SDF localisation to the RPE (p<0.05).

Conclusions:

• SDF, potentially produced by the RPE, may contribute to the pathogenesis of CNV.
• The SDF/CXCR4 pathway is a potential target for therapeutic interventions in CNV.