Ocular surface mast cells promote inflammatory lymphangiogenesis

Area of Science:

• Immunology
• Vascular Biology
• Ophthalmology

Background:

• Mast cells are immune sentinels in vascularized tissues like the skin and ocular surface.
• Mast cells are known to interact with vascular endothelial cells and contribute to angiogenesis.
• The role of mast cells in lymphangiogenesis remains largely undefined.

Purpose of the Study:

• To investigate the contribution of mast cells to lymphangiogenesis.
• To elucidate the mechanisms by which mast cells influence lymph vessel formation.
• To assess the therapeutic potential of targeting mast cells for lymphangiogenesis inhibition.

Main Methods:

• Utilized a murine model of inflammatory corneal angiogenesis.
• Performed in vitro co-culture assays with mast cells and lymphatic endothelial cells.
• Employed mast cell knockout mice and pharmacological inhibition (cromolyn).

Main Results:

• Observed mast cell migration alongside new lymph vessel growth in vivo.
• Demonstrated that mast cells express VEGF-D and promote lymphatic endothelial cell proliferation and tube formation in vitro.
• Showed that mast cell deficiency significantly suppresses inflammatory lymphangiogenesis and VEGF-D expression in the cornea.

Conclusions:

• Mast cells actively promote inflammatory lymphangiogenesis, partly via VEGF-D.
• Targeting mast cells or their mediators presents a potential strategy to inhibit pathological lymphangiogenesis in the eye.