Inhibition of choroidal and corneal pathologic neovascularization by plgf1-de gene transfer

Valeria Tarallo, Sasha Bogdanovich, Yoshio Hirano, Laura Tudisco, Lorena Zentilin, Mauro Giacca, Jayakrishna Ambati, Sandro de Falco*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Purpose. Ocular neovascularization (NV), the primary cause of blindness, typically is treated via inhibition of VEGF-A activity. However, besides VEGF-A, other proteins of the same family, including VEGF-B and placental growth factor (PlGF, all together VEGFs), have a crucial role in the angiogenesis process. PlGF and VEGF, which form heterodimers if co-expressed, both are required for pathologic angiogenesis. We generated a PlGF1 variant, named PlGF1-DE, which is unable to bind and activate VEGFR-1, but retains the ability to form heterodimer. PlGF1-DE acts as dominant negative of VEGF-A and PlGF1wt through heterodimerization mechanism. The purpose of our study was to explore the therapeutic potential of Plgf1-de gene in choroid and cornea NV context. Methods. In the model of laser-induced choroidal neovascularization (CNV), Plgf1-de gene, and as control Plgf1wt, LacZ, or gfp genes, were delivered using adeno-associated virus (AAV) vector by subretinal injection 14 days before the injury. After 7 days CNV volume was assessed. Corneal NV was induced by scrape or suture procedures. Expression vectors for PlGF1wt or PlGF1-DE, and as control the empty vector pCDNA3, were injected in the mouse cornea after the vascularization insults. NV was evaluated with CD31 and LYVE-1 immunostaining. Results. The expression of Plgf1-de induced significant inhibition of choroidal and corneal NV by reducing VEGF-A homodimer production. Conversely, the delivery of Plgf1wt, despite induced similar reduction of VEGF-A production, did not affect NV. Conclusions. Plgf1-de gene is a new therapeutic tool for the inhibition of VEGFs driven ocular NV.

Original languageEnglish (US)
Pages (from-to)7989-7996
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Issue number13
StatePublished - Dec 2012
Externally publishedYes

ASJC Scopus subject areas

  • Sensory Systems
  • Cellular and Molecular Neuroscience
  • Ophthalmology


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