Skin capillary permeability

Skin capillary permeability is a fundamental physiological process describing the rate of exchange of fluids, solutes, and macromolecules between the blood within dermal capillaries and the surrounding interstitial space [1, 11]. This process is essential for maintaining skin homeostasis, delivering nutrients, and facilitating the recruitment of immune cells during an inflammatory response [2, 3]. It is regulated by the structural integrity of the vascular endothelium, specifically the tight junctions (e.g., Claudin-5, ZO-1) and adherens junctions, which are modulated by various biochemical signals [4, 10]. Pathological increases in permeability are observed in conditions such as diabetes mellitus, systemic sclerosis, and acute burn injuries, where they contribute to the formation of edema and subsequent tissue ischemia [1, 2, 11]. While not a single molecular target, skin capillary permeability is a key therapeutic endpoint for drugs that target the Vascular Endothelial Growth Factor (VEGF) pathway or histamine receptors to manage leakage and inflammation [1, 6, 9]. Conversely, stabilizing agents like calcium dobesilate are used to preserve endothelial barrier function and prevent pathological extravasation in chronic microvascular diseases [4].

Other names

Dermal microvascular permeabilityCutaneous capillary permeabilitySkin microvascular leakageCapillary sodium fluorescein leakage

Modulation of endothelial tight junctions, inhibition of VEGF-mediated signaling, or antagonism of vasoactive receptors (e.g., H1 histamine receptors, B2 bradykinin receptors) to alter the rate of trans-endothelial fluid and solute transport [1, 4, 6].