title: Vascular endothelial growth factors and vascular permeability.
abstract: Vascular endothelial growth factors (VEGFs) are key regulators of permeability. The principal evidence behind how they increase vascular permeability in vivo and in vitro and the consequences of that increase are addressed here. Detailed analysis of the published literature has shown that in vivo and in vitro VEGF-mediated permeability differs in its time course, but has common involvement of many specific signalling pathways, in particular VEGF receptor-2 activation, calcium influx through transient receptor potential channels, activation of phospholipase C gamma and downstream activation of nitric oxide synthase. Pathways downstream of endothelial nitric oxide synthase appear to involve the guanylyl cyclase-mediated activation of the Rho-Rac pathway and subsequent involvement of junctional signalling proteins such as vascular endothelial cadherin and the tight junctional proteins zona occludens and occludin linked to the actin cytoskeleton. The signalling appears to be co-ordinated through spatial organization of the cascade into a signalplex, and arguments for why this may be important are considered. Many proteins have been identified to be involved in the regulation of vascular permeability by VEGF, but still the mechanisms through which these are thought to interact to control permeability are dependent on the experimental system, and a synthesis of existing data reveals that in intact vessels the co-ordination of the pathways is still not understood.
authors.affiliation: Microvascular Research Laboratories, Department of Physiology and Pharmacology, School of Veterinary Sciences, Bristol Heart Institute, University of Bristol, Southwell Street, Bristol, UK. dave.bates@bris.ac.uk
authors.forename: David O
authors.initials: DO
authors.lastname: Bates
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000378:metabolism*; D002196:Capillaries / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D002199:Capillary Permeability / Q000187:drug effects; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D006801:Humans; D007700:Kinetics; D015398:Signal Transduction; D042442:Vascular Endothelial Growth Factors / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D042442:Vascular Endothelial Growth Factors
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