Capillary permeability regulators

Capillary permeability regulators are a heterogeneous group of molecular factors and receptors that govern the movement of fluids, ions, and macromolecules across the vascular endothelium. These regulators include pro-permeability factors such as vascular endothelial growth factor (VEGF), histamine, and bradykinin, as well as stabilizing factors like angiopoietin-1 and sphingosine-1-phosphate (S1P). They function by modulating the assembly and disassembly of endothelial cell-cell junctions, specifically tight junctions and adherens junctions, and by regulating transcellular transport mechanisms. In pathological states such as inflammation, cancer, and diabetes, an imbalance in these regulators leads to excessive vascular leakage, resulting in tissue edema, impaired organ function, and disease progression. Therapeutic interventions often target these pathways to restore barrier function; for example, anti-VEGF therapies are widely used in treating wet age-related macular degeneration and diabetic retinopathy. Additionally, drugs like icatibant target bradykinin receptors to treat hereditary angioedema, while S1P modulators are explored for their ability to stabilize the endothelial barrier in various inflammatory conditions.

Other names

Vascular permeability factorsCapillary stabilizing agentsEndothelial barrier regulatorsVasoprotectivesVascular permeability regulators

Drugs targeting capillary permeability regulators typically act by either antagonizing pro-permeability factors (such as VEGF, histamine, or bradykinin) or by enhancing the stability of endothelial cell-cell junctions (e.g., through S1P receptor modulation or Tie2 activation).