TY - JOUR
T1 - Hypoxia-inducible factor-1 drives annexin A2 system-mediated perivascular fibrin clearance in oxygen-induced retinopathy in mice
AU - Huang, Bihui
AU - Deora, Arun B.
AU - He, Kai Li
AU - Chen, Kang
AU - Sui, Guangzhi
AU - Jacovina, Andrew T.
AU - Almeida, Dena
AU - Hong, Peng
AU - Burgman, Paul
AU - Hajjar, Katherine A.
PY - 2011/9/8
Y1 - 2011/9/8
N2 - Oxygen-induced retinopathy (OIR) is a well-characterized model for retinopathy of prematurity, a disorder that results from rapid microvascular proliferation after exposure of the retina to high oxygen levels. Here, we report that the proliferative phase of OIR requires transcriptional induction of the annexin A2 (A2) gene through the direct action of the hypoxiainducible factor-1 complex. We show, in addition, that A2 stabilizes its binding partner, p11, and promotes OIR-related angiogenesis by enabling clearance of perivascular fibrin. Adenoviral-mediated restoration ofA2 expression restores neovascularization in the oxygen-primed Anxa2-/- retina and reinstates plasmin generation and directed migration in cultured Anxa2 -/- endothelial cells. Systemic depletion of fibrin repairs the neovascular response to high oxygen treatment in the Anxa2-/- retina, whereas inhibition of plasminogen activation dampens angiogenesis under the same conditions. These findings show that the A2 system enables retinal neoangiogenesis in OIR by enhancing perivascular activation of plasmin and remodeling of fibrin. These data suggest new potential approaches to retinal angiogenic disorders on the basis of modulation of perivascular fibrinolysis.
AB - Oxygen-induced retinopathy (OIR) is a well-characterized model for retinopathy of prematurity, a disorder that results from rapid microvascular proliferation after exposure of the retina to high oxygen levels. Here, we report that the proliferative phase of OIR requires transcriptional induction of the annexin A2 (A2) gene through the direct action of the hypoxiainducible factor-1 complex. We show, in addition, that A2 stabilizes its binding partner, p11, and promotes OIR-related angiogenesis by enabling clearance of perivascular fibrin. Adenoviral-mediated restoration ofA2 expression restores neovascularization in the oxygen-primed Anxa2-/- retina and reinstates plasmin generation and directed migration in cultured Anxa2 -/- endothelial cells. Systemic depletion of fibrin repairs the neovascular response to high oxygen treatment in the Anxa2-/- retina, whereas inhibition of plasminogen activation dampens angiogenesis under the same conditions. These findings show that the A2 system enables retinal neoangiogenesis in OIR by enhancing perivascular activation of plasmin and remodeling of fibrin. These data suggest new potential approaches to retinal angiogenic disorders on the basis of modulation of perivascular fibrinolysis.
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U2 - 10.1182/blood-2011-03-341214
DO - 10.1182/blood-2011-03-341214
M3 - Article
C2 - 21788340
AN - SCOPUS:80052684642
SN - 0006-4971
VL - 118
SP - 2918
EP - 2929
JO - Blood
JF - Blood
IS - 10
ER -