Oxidative stress promotes ocular neovascularization.

Oxidative stress promotes ocular neovascularization.
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DOI:
10.1002/jcp.21698
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发表时间:
2009-06
影响因子:
5.6
通讯作者:
Campochiaro, Peter A.
Campochiaro, Peter A.
中科院分区:
生物学2区
文献类型:
--
作者:
Dong, Aling;Xie, Bing;Shen, Jikui;Yoshida, Tsunehiko;Yokoi, Katsutoshi;Hackett, Sean F.;Campochiaro, Peter A.

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缺乏超氧化物歧化酶 1 的小鼠(Sod1−/− 小鼠)会出现许多与年龄相关的黄斑变性 (AMD) 患者相同的特征,包括脉络膜新生血管 (NV)。我们试图确定 SOD1 的缺失是否会导致视网膜下腔中的促血管生成环境,或者它是否完全继发于脉络膜 NV 发生之前的布鲁赫膜和视网膜色素上皮 (RPE) 的其他变化。与 Sod1+/+ 小鼠相比,光感受器或缺血中血管内皮生长因子 (VEGF) 的表达导致 Sod1−/− 小鼠的 NV 显着增加。 Sod1−/− 小鼠中受损的抗氧化防御系统有助于形成促血管生成环境,因为用抗氧化剂混合物治疗 Sod1−/− 小鼠会导致缺血诱导的视网膜 NV 显着减少。用相同抗氧化剂处理的野生型小鼠也显示出缺血诱导的视网膜 NV 减少、VEGF 诱导的视网膜下 NV 减少以及布鲁赫膜破裂部位脉络膜 NV 减少。这些数据表明活性氧会导致多种类型的眼部 NV。这可以解释为什么在与年龄相关的眼病试验中,抗氧化剂治疗减少了从非新生血管性 AMD 到新生血管性 AMD 的转化以及严重的视力丧失,并表明应考虑使用强效抗氧化剂来治疗由眼部 NV 并发的其他疾病。
Mice deficient in superoxide dismutase 1 (Sod1−/− mice) develop many features seen in patients with age-related macular degeneration (AMD) including choroidal neovascularization (NV). We sought to determine if the absence of SOD1 contributes to the pro-angiogenic environment in the subretinal space or whether it is completely secondary to other changes in Bruch’s membrane and the retinal pigmented epithelium (RPE) that precede the development of choroidal NV. Expression of vascular endothelial growth factor (VEGF) in photoreceptors or ischemia resulted in significantly more NV in Sod1−/− compared to Sod1+/+ mice. The compromised antioxidant defense system in Sod1−/− mice contributes to the pro-angiogenic environment, because treatment of Sod1−/− mice with a mixture of antioxidants caused a significant reduction in ischemia-induced retinal NV. Wild type mice treated with the same antioxidants also showed reduced ischemia-induced retinal NV, reduced VEGF-induced subretinal NV, and reduced choroidal NV at Bruch’s membrane rupture sites. These data suggest that reactive oxygen species contribute to several types of ocular NV. This could explain why in the Age-Related Eye Disease Trial, antioxidant treatment reduced conversion from non-neovascular to neovascular AMD and severe vision loss, and suggest that potent antioxidants should be considered for other diseases complicated by ocular NV.
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