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  • Intravitreal adenoviral 15-lipoxygenase-1 gene transfer prevents vascular endothelial growth factor A-induced neovascularization in rabbit eyes.

    Hum Gene Ther. 20(12):1679-86. doi: 10.1089/hum.2009.069. December 2009. View on PubMed.
  • Authors

    Viita H, Kinnunen K, Eriksson E, Lähteenvuo J, Babu M, Kalesnykas G, Heikura T, Laidinen S, Takalo T, and Ylä-Herttuala S
  • Abstract

    Excessive angiogenesis mediated by vascular endothelial growth factor (VEGF) plays an important role in angioproliferative ocular diseases. We have previously developed a large animal model for these diseases by intravitreal adenoviral gene transfer of VEGF-A(165). 15-Lipoxygenase-1 (15-LO-1), an oxidizing enzyme producing reactive lipid hydroperoxides, has been shown to induce aberrant angiogenesis in cancer models of transgenic mice overexpressing human 15-LO-1. Our purpose was to study the effects of 15-LO-1 on VEGF-A(165)-induced angiogenesis in New Zealand White rabbit eyes, using intravitreal adenovirus-mediated gene transfers. AdCMV and Adh15-LO-1 alone served as controls. As determined by immunohistochemistry, VEGF-A(165) significantly increased the number and size of the capillaries in various compartments of the eyes. 15-LO-1 efficiently inhibited VEGF-A(165)-induced neovascularization and pathological changes by reducing VEGF-A(165) mRNA and protein expression, determined by RT-PCR, ELISA, and immunohistochemistry. 15-LO-1, which produces endogenous ligands for peroxisome proliferator-activated receptor-gamma (PPARgamma), also prevented VEGF-A(165)-induced expression of PPARgamma and VEGF receptor-2, as measured by quantitative RT-PCR. In conclusion, our findings show that 15-LO-1 prevents VEGF-A(165)-induced angiogenesis and consequent pathology in the eyes, suggesting that intravitreal 15-LO-1 gene transfer could be a potential new strategy for the treatment of neovascular complications in the eyes.

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