Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213;
Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213.
Proc Natl Acad Sci U S A. 2021 May 25;118(21). doi: 10.1073/pnas.2017198118.
Loss of the retinal pigment epithelium (RPE) because of dysfunction or disease can lead to blindness in humans. Harnessing the intrinsic ability of the RPE to self-repair is an attractive therapeutic strategy; however, mammalian RPE is limited in its regenerative capacity. Zebrafish possess tremendous intrinsic regenerative potential in ocular tissues, including the RPE, but little is known about the mechanisms driving RPE regeneration. Here, utilizing transgenic and mutant zebrafish lines, pharmacological manipulations, transcriptomics, and imaging analyses, we identified elements of the immune response as critical mediators of intrinsic RPE regeneration. After genetic ablation, the RPE express immune-related genes, including leukocyte recruitment factors such as We demonstrate that macrophage/microglia cells are responsive to RPE damage and that their function is required for the timely progression of the regenerative response. These data identify the molecular and cellular underpinnings of RPE regeneration and hold significant potential for translational approaches aimed toward promoting a pro-regenerative environment in mammalian RPE.
由于功能障碍或疾病导致视网膜色素上皮 (RPE) 丧失,可导致人类失明。利用 RPE 的内在自我修复能力是一种有吸引力的治疗策略;然而,哺乳动物 RPE 的再生能力有限。斑马鱼在眼部组织(包括 RPE)中具有巨大的内在再生潜力,但关于驱动 RPE 再生的机制知之甚少。在这里,我们利用转基因和突变斑马鱼系、药理学操作、转录组学和成像分析,确定了免疫反应的元素作为内在 RPE 再生的关键介质。在基因消融后,RPE 表达免疫相关基因,包括白细胞募集因子,如 我们证明巨噬细胞/小胶质细胞对 RPE 损伤有反应,其功能对于再生反应的及时进展是必需的。这些数据确定了 RPE 再生的分子和细胞基础,并为旨在促进哺乳动物 RPE 中有利于再生的环境的转化方法提供了重要潜力。