Hypoxic drive caused type 3 neovascularization in a preclinical model of exudative age-related macular degeneration.

Abstract:

:Hypoxia associated with the high metabolic demand of rods has been implicated in the pathology of age-related macular degeneration (AMD), the most common cause of adult blindness in the developed world. The majority of AMD-associated severe vision loss cases are due to exudative AMD, characterized by neovascularization. To further investigate the causes and histopathology of exudative AMD, we conditionally induced hypoxia in a novel preclinical AMD model (Pde6gcreERT2/+;Vhl-/-) by targeting Vhl and used multimodal imaging and immunohistochemistry to track the development of hypoxia-induced neovascularization. In addition to developing a preclinical model that phenocopies exudative AMD, our studies revealed that the photoreceptor hypoxic response initiates and drives type 3 neovascularization, mainly in the outer retina. Activation of the VHL-HIF1a-VEGF-EPO pathway in the adult retina led to long-term neovascularization, retinal hemorrhages and compromised retinal layers. Our novel preclinical model would accelerate the testing of therapies that use metabolomic approaches to ameliorate AMD.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Zhang L,Cui X,Han Y,Park KS,Gao X,Zhang X,Yuan Z,Hu Y,Hsu CW,Li X,Bassuk AG,Mahajan VB,Wang NK,Tsang SH

doi

10.1093/hmg/ddz159

subject

Has Abstract

pub_date

2019-10-15 00:00:00

pages

3475-3485

issue

20

eissn

0964-6906

issn

1460-2083

pii

5568676

journal_volume

28

pub_type

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