Endothelial barrier stabilization pathway (EBS pathway)

The endothelial barrier stabilization pathway is a coordinated signaling network essential for maintaining vascular integrity and preventing paracellular leakage of plasma components (Saharinen et al., 2017, Nature Reviews Molecular Cell Biology). Central to this pathway is the Tie2 receptor tyrosine kinase, which, when activated by its ligand Angiopoietin-1, promotes endothelial quiescence and strengthens cell-cell junctions (Augustin et al., 2009, Nature Reviews Molecular Cell Biology). Adherens junctions, primarily composed of Vascular Endothelial (VE)-cadherin, are stabilized through the recruitment of catenins and the regulation of the actin cytoskeleton by Rho-family GTPases like Rac1 (Giannotta et al., 2013, Developmental Cell). In diseases such as sepsis, acute respiratory distress syndrome (ARDS), and diabetic retinopathy, this pathway is compromised by factors like Angiopoietin-2 and VEGF, leading to life-threatening edema and organ failure (Parikh et al., 2006, PLOS Medicine). Therapeutic interventions, including Tie2 agonists (e.g., AV-001) and VE-PTP inhibitors (e.g., Razuprotafib), aim to restore barrier function by reinforcing these molecular junctions and reducing vascular hyperpermeability (Frye et al., 2015, Journal of Experimental Medicine). Additionally, modulation of Sphingosine-1-Phosphate (S1P) receptors can enhance the cortical actin cytoskeleton, further reinforcing the physical barrier against fluid extravasation (Feistritzer & Riewald, 2005, Blood).

Other names

Endothelial barrier functionVascular barrier stabilizationEndothelial permeability regulationTie2/Angiopoietin signaling pathway

The mechanism of action involves the stabilization of endothelial cell-cell junctions, primarily through the activation of the Tie2 receptor tyrosine kinase and the subsequent sequestration of VE-cadherin at the plasma membrane (Saharinen et al., 2017, Nature Reviews Molecular Cell Biology). This is often achieved by Tie2 agonists or by inhibiting VE-PTP, a phosphatase that normally dephosphorylates Tie2 and VE-cadherin (Frye et al., 2015, Journal of Experimental Medicine). Additionally, modulation of Sphingosine-1-Phosphate (S1P) receptors (particularly S1PR1) enhances the cortical actin cytoskeleton, further reinforcing the physical barrier against fluid extravasation (Feistritzer & Riewald, 2005, Blood).