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Very Low Density Lipoprotein Receptor, a Negative Regulator of the wnt Signaling Pathway and Choroidal Neovascularization

Chen, Ying, Hu, Yang, Lu, Kangmo, Flannery, John G., Ma, Jian-xing·2007·Journal of Biological Chemistry

Abstract

Choroidal neovascularization (CNV) in age-related macular degeneration is a leading cause of blindness. Very low density lipoprotein receptor gene knock-out (Vldlr(-/-)) mice have been shown to develop subretinal neovascularization (NV) with an unknown mechanism. The present study showed that in Vldlr(-/-) mice, NV initiated in the choroid and progressed to penetrate the retinal pigment epithelium layer, proliferating in the subretinal space. This phenotype recapitulated what is seen in wet age-related macular degeneration, suggesting that this is a CNV model. The CNV correlated with overexpression of vascular endothelial growth factor in Vldlr(-/-) eyecups and was blocked by a neutralizing antibody against vascular endothelial growth factor receptor-2. The wnt co-receptor LRP5/6 expression was significantly up-regulated in Vldlr(-/-) eyecups compared with that in wild-type mice. Significantly, Vldlr(-/-) mice showed impaired phosphorylation of downstream effectors of the wnt signaling pathway, glycogen synthase kinase-3beta (GSK-3beta), and beta-catenin, concomitant with increased levels of free GSK-3beta and beta-catenin, suggesting an increased activity of the wnt pathway. Down-regulation of VLDLR by small interference RNA resulted in up-regulation of LRP5/6 expression and activation of beta-catenin in cultured endothelial cells. Furthermore, Dickkopf-1, a specific inhibitor of the wnt pathway, effectively decreased vascular endothelial growth factor and beta-catenin level…

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Metadata

Authors
Chen, Y., Hu, Y., Lu, K., Flannery, J. G., & Ma, J.-X.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2007-11
Volume
282
Issue
47
Pages
34420-34428
ISSN
0021-9258
Cited by
92
References
3
Language
en

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