Aqueous humor induces lymphatic regression on the ocular surface

Area of Science:

• Ophthalmology
• Vascular Biology
• Cell Biology

Background:

• Lymphatic vessels are crucial for fluid homeostasis and immune surveillance in the eye.
• Dysfunctional ocular lymphatic vessels are implicated in various eye diseases.

Purpose of the Study:

• To investigate the effect of aqueous humor on pre-existing conjunctival lymphatic vessels.
• To determine if aqueous humor can induce regression of ocular lymphatic vessels in vivo and in vitro.

Main Methods:

• Aqueous humor from bovine or murine eyes was injected into Prox-1-GFP transgenic mice.
• Live in vivo imaging was used to observe conjunctival lymphatics.
• Ex vivo tissue cultures and human microdermal lymphatic endothelial cell cultures were performed to assess lymphatic tube regression.

Main Results:

• Aqueous humor induced regression of lymphatic vessels in normal conjunctiva and inflamed corneas.
• In vitro studies confirmed that aqueous humor causes regression of lymphatic endothelial cell tubes.

Conclusions:

• This study provides the first direct live imaging evidence that aqueous humor induces lymphatic regression.
• These findings suggest potential new therapeutic strategies for ocular and systemic lymphatic diseases.