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在亚视网膜脂质诱导的年龄相关性黄斑变性模型中,脉络膜和视网膜中的氧化应激、炎症和新生血管的演变。

Evolution of oxidative stress, inflammation and neovascularization in the choroid and retina in a subretinal lipid induced age-related macular degeneration model.

机构信息

Center for Nanomedicine at the Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

出版信息

Exp Eye Res. 2021 Feb;203:108391. doi: 10.1016/j.exer.2020.108391. Epub 2020 Dec 8.

Abstract

Oxidative stress, inflammation and neovascularization are the key pathological events that are implicated in human age-related macular degeneration (AMD). There are a limited number of animal models available for evaluating and developing new therapies. Most models represent late exudative or neovascular AMD (nAMD) but there is a relative paucity of models that mimic early events in AMD. The purpose of this study is to characterize the evolution of oxidative stress, inflammation, retinal degeneration and neovascularization in a rat model of AMD, created by subretinal injection of human lipid hydroperoxide (HpODE) that found in the sub-macular region in aged and AMD patients. Subretinal HpODE induced retinal pigment epithelium (RPE) and retinal degeneration resulting in loss of RPE cells, photoreceptors and retinal thinning. RPE degeneration and atrophy were detected by day 5, followed by neural tissue degeneration at day 12 with robust TUNEL positive cells. Western blot analysis confirmed an increase in pro-apoptotic Bak protein at day 12 in retinal tissues. Oxidative damage biomarkers (4-hydroxynonenal, malondialdehyde, 8-hydroxy-2'-deoxyguanosine, and nitrotyrosine) increased in retinal tissue from days 5-12. Müller glial activation was observed in the HpODE injected area at day 5 followed by its remodeling and migration in the outer retina by day 20. RT-qPCR analysis further indicated upregulation of pro-inflammatory genes (TNF-α, IL-1β and IL-6) both in retinal and RPE/choroidal tissue as early as day 2 and persisted until day 12. Upregulation of oxidative stress markers such as NADPH oxidase (NOX and DOUX family) was detected early in retinal tissue by day 2 followed by its upregulation in choroidal tissue at day 5. Neovascularization was demonstrated from day 12 to day 20 post HpODE injection in choroidal tissue. The results from this study indicate that subretinal HpODE induces advanced AMD phenotypes comprising many aspects of both dry/early and late) and neovascular/late AMD as observed in humans. Within 3 weeks via oxidative damage, upregulation of reactive oxygen species and pro-inflammatory genes, pro-apoptotic Bak and pro-angiogenic VEGF upregulation occurs leading to CNV formation. This experimental model of subretinal HpODE is an appropriate model for the study of AMD and provides an important platform for translational and basic research in developing new therapies particularly for early/dry AMD where currently no viable therapies are available.

摘要

氧化应激、炎症和新生血管形成是与人类年龄相关性黄斑变性(AMD)相关的关键病理事件。目前可用于评估和开发新疗法的动物模型数量有限。大多数模型代表晚期渗出性或新生血管性 AMD(nAMD),但模仿 AMD 早期事件的模型相对较少。本研究的目的是描述通过亚视网膜注射在年龄相关性黄斑变性患者黄斑下区域发现的人脂质过氧化物(HpODE)在 AMD 大鼠模型中氧化应激、炎症、视网膜变性和新生血管形成的演变。亚视网膜 HpODE 诱导视网膜色素上皮(RPE)和视网膜变性导致 RPE 细胞、光感受器和视网膜变薄的损失。RPE 变性和萎缩在第 5 天检测到,随后在第 12 天检测到神经组织变性,具有强烈的 TUNEL 阳性细胞。Western blot 分析证实,在第 12 天视网膜组织中促凋亡 Bak 蛋白增加。氧化损伤生物标志物(4-羟基壬烯醛、丙二醛、8-羟基-2'-脱氧鸟苷和硝基酪氨酸)在第 5-12 天的视网膜组织中增加。在第 5 天观察到 HpODE 注射区域的 Müller 胶质细胞激活,随后在第 20 天在外视网膜中重塑和迁移。RT-qPCR 分析进一步表明,在第 2 天,视网膜和 RPE/脉络膜组织中促炎基因(TNF-α、IL-1β 和 IL-6)的表达上调,并持续到第 12 天。在第 2 天,视网膜组织中早期检测到 NADPH 氧化酶(NOX 和 DOUX 家族)等氧化应激标志物的上调,第 5 天,脉络膜组织中检测到其上调。在 HpODE 注射后第 12 天至第 20 天,在脉络膜组织中证实了新生血管形成。本研究结果表明,亚视网膜 HpODE 诱导包括干性/早期和晚期)和新生血管性/晚期 AMD 在内的多种 AMD 表型,这在人类中观察到。在 3 周内,通过氧化损伤、活性氧和促炎基因的上调、促凋亡 Bak 和促血管生成 VEGF 的上调,导致 CNV 形成。这种亚视网膜 HpODE 的实验模型是 AMD 研究的合适模型,为开发新疗法提供了重要平台,特别是对目前尚无可行疗法的干性/早期 AMD 。

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