Center for Infectious Diseases and Vaccine Research; Department of Medicine, Division of Infectious Diseases and Immunology
*Capillary Permeability; Cells, Cultured; Child; Dengue; Dengue Hemorrhagic Fever; Dengue Virus; Endothelium, Vascular; Humans; Phosphorylation; Solubility; Umbilical Veins; Vascular Endothelial Growth Factor A; Vascular Endothelial Growth Factor Receptor-2
Life Sciences | Medicine and Health Sciences
Some individuals infected with dengue virus develop dengue hemorrhagic fever (DHF), a viral hemorrhagic disease characterized by a transient period of localized plasma leakage. To determine the importance of vascular endothelial growth factor A (VEGF-A) in this syndrome, we compared plasma levels of VEGF-A and the soluble forms of its receptors in patients with DHF to patients with dengue fever (DF), a milder form of dengue virus infection without plasma leakage. We observed a rise in the plasma levels of free, but not total VEGF-A in DHF patients at the time of plasma leakage. This was associated with a decline in the soluble form of VEGF receptor 2 (VEGFR2) and VEGF-soluble VEGFR2 complexes, but not the soluble form of VEGFR1. The severity of plasma leakage in patients inversely correlated with plasma levels of soluble VEGFR2. In vitro, dengue virus suppressed soluble VEGFR2 production by endothelial cells but up-regulated surface VEGFR2 expression and promoted response to VEGF stimulation. In vivo, plasma viral load correlated with the degree of decline in plasma soluble VEGFR2. These results suggest that VEGF regulates vascular permeability and its activity is controlled by binding to soluble VEGFR2. Dengue virus-induced changes in surface and soluble VEGFR2 expression may be an important mechanism of plasma leakage in DHF.
DOI of Published Version
J Virol. 2007 Feb;81(4):1592-600. Epub 2006 Dec 6. Link to article on publisher's site
Journal of virology
Srikiatkhachorn, Anon; Ajariyakhajorn, Chuanpis; Endy, Timothy P.; Kalayanarooj, Siripen; Libraty, Daniel H.; Green, Sharone; Ennis, Francis A.; and Rothman, Alan L., "Virus-induced decline in soluble vascular endothelial growth receptor 2 is associated with plasma leakage in dengue hemorrhagic Fever" (2006). Open Access Articles. 1504.