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Angiopoietin-1 protects the adult vasculature against plasma leakage

Abstract

Pathological increases in vascular leakage lead to edema and swelling, causing serious problems in brain tumors, in diabetic retinopathy, after strokes, during sepsis and also in inflammatory conditions such as rheumatoid arthritis and asthma. Although many agents and disease processes increase vascular leakage, no known agent specifically makes vessels resistant to leaking. Vascular endothelial growth factor1 (VEGF) and the angiopoietins2 function together during vascular development, with VEGF acting early during vessel formation3,4,5, and angiopoietin-1 acting later during vessel remodeling, maturation and stabilization6,7,8,9. Although VEGF was initially called vascular permeability factor10,11, there has been less focus on its permeability actions and more effort devoted to its involvement in vessel growth and applications in ischemia and cancer. Recent transgenic approaches have confirmed the profound permeability effects of VEGF (refs. 1214), and have shown that transgenic angiopoietin-1 acts reciprocally as an anti-permeability factor when provided chronically during vessel formation14, although it also profoundly affects vascular morphology when thus delivered14,15. To be useful clinically, angiopoietin-1 would have to inhibit leakage when acutely administered to adult vessels, and this action would have to be uncoupled from its profound angiogenic capabilities. Here we show that acute administration of angiopoietin-1 does indeed protect adult vasculature from leaking, countering the potentially lethal actions of VEGF and inflammatory agents.

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Figure 1: Adenoviral infection by Ad–VEGF and Ad–Ang1 leads to specific expression of adenovirally produced products in the liver, producing circulating VEGF or angiopoietin-1, and resulting in dose-dependent reduction in survival after administration of Ad–VEGF but not Ad–Ang1.
Figure 2: Administration of Ad–VEGF leads to systemic vascular leakage in C57BL/6 mice.
Figure 3: Systemic angiopoietin-1 production by adenoviral gene delivery causes resistance to vascular leakage induced by mustard oil and VEGF.
Figure 4: Vessel morphology in lectin-stained whole mounts of ear skin.

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Acknowledgements

We thank C. Suri, N. Gale and R. Torres, as well as the entire Regeneron community, for scientific discussion; K. Smith for technical assistance at the University of California at San Francisco; S. Mahon for technical assistance at Regeneron; D. Hylton for enzyme-linked immunosorbent assays; and E. Burrows for graphics production. This work was supported by National Institutes of Health grants HL59157 & HL24136 (National Heart, Lung and Blood Institute).

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Correspondence to Gavin Thurston or George D. Yancopoulos.

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Thurston, G., Rudge, J., Ioffe, E. et al. Angiopoietin-1 protects the adult vasculature against plasma leakage . Nat Med 6, 460–463 (2000). https://doi.org/10.1038/74725

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