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首页> 外文期刊>Journal of Cellular Physiology >Implication of the hypoxia response element of the Vegf promoter in mouse models of retinal and choroidal neovascularization, but not retinal vascular development.
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Implication of the hypoxia response element of the Vegf promoter in mouse models of retinal and choroidal neovascularization, but not retinal vascular development.

机译:的缺氧反应元素的含义Vegf促进视网膜和小鼠模型脉络膜新生血管形成,但并不是视网膜血管的发展。

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摘要

Retinal neovascularization (NV) and macular edema, resulting from blood-retinal barrier (BRB) breakdown, are major causes of visual loss in ischemic retinopathies. Choroidal NV (CNV) occurs in diseases of the retinal pigmented epithelium/Bruch's membrane complex and is another extremely prevalent cause of visual loss. We used mice in which the hypoxia response element (HRE) is deleted from the vascular endothelial growth factor (vegf) promoter (Vegf(delta/delta) mice) to explore the role of induction of VEGF through the HRE in these disease processes. Compared to wild type (Vegf+/+) mice with oxygen-induced ischemic retinopathy (OIR) in which vegf mRNA levels were increased and prominent retinal NV and BRB breakdown occurred, Vegf(delta/delta) littermates with OIR failed to increase vegf mRNA levels in the retina and had significantly less retinal NV and BRB breakdown, but showed prominent dilation of some superficial retinal vessels. Vegf(+/delta) littermates with ischemic retinopathy developed comparable retinal NV to Vegf+/+ mice, exhibited intermediate levels of BRB breakdown, and did not show vasodilation. In a mouse model of CNV, due to laser-induced rupture of Bruch's membrane, the area of CNV at Bruch's membrane rupture sites was more than tenfold greater in Vegf+/+ mice than in Vegf(delta/delta) littermates. In contrast to these dramatic differences in pathologic ocular NV, Vegf(delta/delta) mice showed subtle differences in retinal vascular development compared to Vegf+/+ mice; it was slightly delayed, but otherwise normal. These data suggest that induction of VEGF through the HRE in its promoter is critical for retinal and CNV, but not for retinal vascular development.
机译:视网膜新生血管形成(NV)和黄斑水肿,造成blood-retinal屏障(马上回来)崩溃,是视力丧失的主要原因缺血性视网膜病变。视网膜色素的疾病上皮细胞/布鲁赫膜复杂视力丧失的另一个极其普遍的原因。我们使用老鼠的缺氧反应(一定是)从血管中删除元素血管内皮生长因子(vegf)启动子(Vegf(δ/δ)小鼠)探索的作用通过在这些一定是诱导VEGF疾病的过程。(Vegf + / +)小鼠oxygen-induced缺血性中风视网膜病(OIR) vegf mRNA水平增加,突出视网膜NV,马上回来故障发生时,Vegf(δ/δ)同窝出生的与OIR未能增加vegf mRNA水平视网膜,大大减少视网膜NV马上回来崩溃,但显示突出的扩张一些肤浅的视网膜血管。Vegf(+ /δ)与缺血性的同胞视网膜病变发展类似视网膜NVVegf + / +老鼠,中级水平的展出马上回来击穿,不显示血管舒张。由于激光CNV的小鼠模型布鲁赫膜破裂,CNV的面积布鲁赫膜破裂超过网站Vegf + / +老鼠的十倍大比Vegf(δ/δ)同窝出生的。这些病理眼部产生巨大的差异NV, Vegf(δ/δ)老鼠微妙视网膜血管发展的差异而Vegf + / +老鼠;推迟,否则正常。通过在其一定是感应的VEGF启动子对视网膜和CNV至关重要,但不是视网膜血管发展。

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