Lymphatic endothelial cell junction (LEC junction)

Lymphatic endothelial cell (LEC) junctions are specialized intercellular structures that maintain the integrity of the lymphatic vasculature while facilitating the transport of fluid, solutes, and immune cells (Baluk et al., 2007, J Exp Med). These junctions are categorized into two distinct types: 'button-like' junctions in initial lymphatics, which allow for the entry of interstitial fluid, and 'zipper-like' junctions in collecting lymphatics, which prevent leakage during transport (Zhang et al., 2020, Front Physiol). The molecular composition of these junctions includes adherens junction proteins like VE-cadherin and tight junction proteins such as Claudin-5, Occludin, and Junctional Adhesion Molecules (JAMs) (Dejana et al., 2009, Nat Rev Mol Cell Biol). Dysregulation of LEC junctions is a hallmark of several pathological conditions, including lymphedema, where impaired junctional integrity leads to fluid accumulation, and cancer, where weakened junctions facilitate the intravasation of tumor cells into the lymphatic system (Yao et al., 2012, Development). Therapeutic targeting of LEC junctions involves modulating signaling pathways, such as the VEGF-C/VEGFR3 or Angiopoietin/Tie2 axes, to either stabilize the barrier or promote lymphatic drainage (Zhang et al., 2020, Front Physiol). Consequently, these junctions represent a critical interface for managing inflammatory diseases and preventing metastatic spread.

Other names

Lymphatic endothelial junctionLEC junctionButton-like junctionZipper-like junctionLymphatic intercellular junction

Modulation of junctional protein assembly and phosphorylation through signaling cascades (e.g., VEGFR3, Tie2) to regulate paracellular permeability and leukocyte diapedesis.