Laboratory of Retinal Neurochemistry and Experimental Ophthalmology, Department of Human Biochemistry, School of Medicine/CEFyBO, University of Buenos Aires/CONICET, Buenos Aires C1121ABG, Argentina.
Faculty of Medical Sciences, Pontifical Catholic University of Argentina, BIOMED/UCA/CONICET, Buenos Aires C1107AFB, Argentina.
Dis Model Mech. 2018 Feb 7;11(2):dmm031641. doi: 10.1242/dmm.031641.
Non-exudative age-related macular degeneration, a prevalent cause of blindness, is a progressive and degenerative disease characterized by alterations in Bruch's membrane, retinal pigment epithelium, and photoreceptors exclusively localized in the macula. Although experimental murine models exist, the vast majority take a long time to develop retinal alterations and, in general, these alterations are ubiquitous, with many resulting from non-eye-specific genetic manipulations; additionally, most do not always reproduce the hallmarks of human age-related macular degeneration. Choroid vessels receive sympathetic innervation from the superior cervical ganglion, which, together with the parasympathetic system, regulates blood flow into the choroid. Choroid blood flow changes have been involved in age-related macular degeneration development and progression. At present, no experimental models take this factor into account. The aim of this work was to analyze the effect of superior cervical gangliectomy (also known as ganglionectomy) on the choroid, Bruch's membrane, retinal pigment epithelium and retina. Adult male C57BL/6J mice underwent unilateral superior cervical gangliectomy and a contralateral sham procedure. Although superior cervical gangliectomy induced ubiquitous choroid and choriocapillaris changes, it induced Bruch's membrane thickening, loss of retinal pigment epithelium melanin content and retinoid isomerohydrolase, the appearance of drusen-like deposits, and retinal pigment epithelium and photoreceptor atrophy, exclusively localized in the temporal side. Moreover, superior cervical gangliectomy provoked a localized increase in retinal pigment epithelium and photoreceptor apoptosis, and a decline in photoreceptor electroretinographic function. Therefore, superior cervical gangliectomy recapitulated the main features of human non-exudative age-related macular degeneration, and could become a new experimental model of dry age-related macular degeneration, and a useful platform for developing new therapies.
非渗出性年龄相关性黄斑变性是一种常见的致盲原因,是一种进行性和退行性疾病,其特征在于布鲁赫膜、视网膜色素上皮和光感受器的改变,这些改变仅局限于黄斑。虽然存在实验性的小鼠模型,但绝大多数需要很长时间才能出现视网膜改变,而且通常这些改变是普遍存在的,其中许多是由于非眼部特异性的基因操作引起的;此外,大多数模型并不总是能再现人类年龄相关性黄斑变性的特征。脉络膜血管接受来自颈上交感神经节的交感神经支配,交感神经和副交感神经系统共同调节脉络膜的血流。脉络膜血流的变化与年龄相关性黄斑变性的发展和进展有关。目前,没有实验模型考虑到这一因素。本研究旨在分析颈上交感神经节切除术(也称为神经节切除术)对脉络膜、布鲁赫膜、视网膜色素上皮和视网膜的影响。成年雄性 C57BL/6J 小鼠接受单侧颈上交感神经节切除术和对侧假手术。尽管颈上交感神经节切除术引起了普遍的脉络膜和脉络膜毛细血管变化,但它也引起了布鲁赫膜增厚、视网膜色素上皮黑色素含量和视黄醛异构水解酶丧失、出现类似玻璃膜疣样沉积物以及视网膜色素上皮和光感受器萎缩,这些改变仅局限于颞侧。此外,颈上交感神经节切除术引起了视网膜色素上皮和光感受器的局部凋亡增加,以及光感受器视网膜电图功能下降。因此,颈上交感神经节切除术再现了人类非渗出性年龄相关性黄斑变性的主要特征,可能成为干性年龄相关性黄斑变性的新实验模型,并为开发新疗法提供了一个有用的平台。