The absence of angiopoietin-2 leads to abnormal vascular maturation and persistent proliferative retinopathy

Feng, Yuxi; Vom Hagen, Franziska; Wang, Yumei; Beck, Susanne; Schreiter, Kay; Pfister, Frederick; Hoffmann, Sigrid; Wagner, Patrick; Seeliger, Mathias; Molema, Grietje; Deutsch, Urban; Hammes, Hans-Peter (2009). The absence of angiopoietin-2 leads to abnormal vascular maturation and persistent proliferative retinopathy. Thrombosis and haemostasis, 102(1), pp. 120-30. Stuttgart: Schattauer 10.1160/TH08-09-0567

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Angiopoietin-2 (Ang-2) antagonises the maturing effect of angiopoietin-1 (Ang-1) on blood vessels, and cooperates with VEGF to induce neovascularisation. In knockout mice, Ang-2 displayed a specific role in postnatal angiogenic remodelling. Here, we demonstrate that mice deficient in Ang-2 fail to form a proper spatial retinal vascular network. The retinal vasculature was characterised by reduced large vessel numbers and defects forming the superficial periphery mostly on the arteriolar site, and the secondary and tertiary deep capillary network. Hypoxia in the retinal periphery induced a four-fold VEGF upregulation and active endothelial proliferation for up to 60 days. Concomitantly, retinal digest preparations showed increased arteriolar (+33%) and capillary diameters (+90%), and fluorescein angiograms revealed leakiness of neovascular front. At one year of age, persistent preretinal vessels were non-leaky in accordance with a relative increase in the ratio of Ang-1 to VEGF. Taken together, the data suggest that Ang-2 has an important function in the spatial configuration of the three-dimensional retinal vasculature. Secondarily, prolonged VEGF activity results in a model of persistent proliferative retinopathy.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Theodor Kocher Institute

UniBE Contributor:

Deutsch, Urban








Factscience Import

Date Deposited:

04 Oct 2013 15:13

Last Modified:

04 May 2014 23:23

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URI: (FactScience: 197077)

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