Molecular Mechanisms Controlling Lymphatic Endothelial Junction Integrity.

Area of Science:

• Vascular Biology
• Cell Biology
• Physiology

Background:

• The lymphatic system is crucial for fluid balance, lipid absorption, and immune function.
• Lymphatic vessel abnormalities and diseases are complex and not fully understood.
• Mature lymphatic vasculature comprises a hierarchical network of lymphatic endothelial cells (LECs) with specialized junctions.

Purpose of the Study:

• To review recent advances in understanding lymphatic endothelial cell (LEC) junction mechanisms.
• To explore the roles of button- and zipper-like junctions in lymphatic permeability and function.
• To discuss key pathways controlling LEC junctional integrity, including VEGF and RhoA/ROCK signaling.

Main Methods:

• This review synthesizes current research on lymphatic endothelial cell junction biology.
• It examines findings related to tissue- and organ-specific functions of lymphatic vessels.
• The review integrates knowledge on signaling pathways influencing lymphatic vessel integrity.

Main Results:

• Lymphatic capillaries feature discontinuous, button-like LEC junctions for high permeability.
• Collecting lymphatic vessels have continuous, zipper-like LEC junctions for low-leakage transport.
• Specific mechanisms governing these distinct junction types and their roles are elucidated.

Conclusions:

• Lymphatic endothelial cell junctions are critical for lymphatic system function and homeostasis.
• Understanding these junctions offers insights into lymphatic abnormalities and diseases.
• Targeting pathways like VEGF and RhoA/ROCK signaling may modulate lymphatic vessel integrity.