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色素沉着的C57BL/6J小鼠视网膜中进行性光氧化变性和炎症模型。

A model of progressive photo-oxidative degeneration and inflammation in the pigmented C57BL/6J mouse retina.

作者信息

Natoli Riccardo, Jiao Haihan, Barnett Nigel L, Fernando Nilisha, Valter Krisztina, Provis Jan M, Rutar Matt

机构信息

John Curtin School of Medical Research, The Australian National University, Canberra, ACT 2601, Australia; ANU Medical School, The Australian National University, Canberra, ACT 2601, Australia.

John Curtin School of Medical Research, The Australian National University, Canberra, ACT 2601, Australia.

出版信息

Exp Eye Res. 2016 Jun;147:114-127. doi: 10.1016/j.exer.2016.04.015. Epub 2016 May 4.

Abstract

Light-induced degeneration in rodent retinas is an established model for of retinal degeneration, including the roles of oxidative stress and neuroinflammatory activity. In these models, photoreceptor death is elicited via photo-oxidative stress, and is exacerbated by recruitment of subretinal macrophages and activation of immune pathways including complement propagation. Existing light damage models have relied heavily on albino rodents, and mostly using acute light stimuli. These albino models have proven valuable in uncovering the pathogenic mechanisms of such pathways in the context of retinal disease. However, their inherent albinism hinders comparability to normal retinal physiology, and also makes gene technology analysis time-consuming due to the predominance of the pigmented mouse strains in these applications. In this study, we characterise a new light damage model utilising C57BL/6J mice over a 7 day period of chronic light exposure. We use high-efficiency LED technology to deliver a sustained intensity of 100 k lux with negligible modulation of ambient temperature. We show that in the C57BL/6J mouse, chronic light exposure elicits the cardinal features of light damage including photoreceptor degeneration, atrophy of the choriocapillaris, decreased retinal function and increases in oxidative stress markers 4-HNE and 8-OHG, which emerge progressively over the 7 day period of exposure. These changes are accompanied by robust recruitment of IBA1+ and F4/80 + microglia/macrophages to the ONL and subretinal space, followed the strong up-regulation of monocyte-chemoattractants Ccl2, Ccl3, and Ccl12, as well as increases in expression of complement component C3. These findings are in agreement with prior damage models conducted in albino rodents such as Balb/c mice, and support the use of this new model in further investigating the causative features of oxidative stress and inflammation in retinal disease.

摘要

啮齿动物视网膜的光诱导变性是一种已确立的视网膜变性模型,可用于研究氧化应激和神经炎症活动的作用。在这些模型中,光感受器死亡是由光氧化应激引发的,并且会因视网膜下巨噬细胞的募集和包括补体传播在内的免疫途径的激活而加剧。现有的光损伤模型严重依赖白化病啮齿动物,并且大多使用急性光刺激。这些白化病模型已被证明在揭示视网膜疾病背景下此类途径的致病机制方面具有重要价值。然而,它们固有的白化病特征阻碍了与正常视网膜生理学的可比性,并且由于在这些应用中色素沉着小鼠品系占主导地位,也使得基因技术分析耗时较长。在本研究中,我们描述了一种新的光损伤模型,该模型使用C57BL/6J小鼠,进行为期7天的慢性光暴露。我们使用高效LED技术提供持续强度为100 klux的光,且对环境温度的调节可忽略不计。我们发现,在C57BL/6J小鼠中,慢性光暴露引发了光损伤的主要特征,包括光感受器变性、脉络膜毛细血管萎缩、视网膜功能下降以及氧化应激标志物4-HNE和8-OHG增加,这些变化在7天的暴露期内逐渐出现。这些变化伴随着IBA1+和F4/80 +小胶质细胞/巨噬细胞大量募集到外核层和视网膜下间隙,随后单核细胞趋化因子Ccl2、Ccl3和Ccl12强烈上调,以及补体成分C3表达增加。这些发现与之前在白化病啮齿动物(如Balb/c小鼠)中进行的损伤模型一致,并支持使用这种新模型进一步研究视网膜疾病中氧化应激和炎症的致病特征。

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