相关实验视频

Updated: Jul 12, 2025

Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo

Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo

Published on: September 22, 2017

帕罗酶2缺乏导致视网膜色素上皮细胞中的线粒体功能障碍和小鼠视网膜退化

Parameswaran Gangadharan Sreekumar¹, Feng Su², Christine Spee¹

¹Doheny Eye Institute, Pasadena, CA 91103, USA.

Antioxidants (Basel, Switzerland)

|October 28, 2023

概括

对氧化酶2 (PON2) 缺乏会在与年龄相关的黄斑变性 (AMD) 模型中恶化视网膜线粒体功能障碍和视力丧失. PON2在视网膜健康中起着保护作用,突出显示了其在AMD治疗中的治疗潜力.

科学领域:

眼科医生眼科眼科
线粒体生物学线粒体生物学
氧化压力研究研究氧化压力研究

背景情况:

氧化应激是与年龄相关的黄斑变性 (AMD) 发病的一个关键因素,特别是由于视网膜的高氧耗.
氧酶2 (PON2) 是一种与线粒体相关的细胞内抗氧化酶,已知可以调节活性氧物种 (ROS) 生产和线粒体功能.

研究的目的:

研究PON2在AMD病理生理学中的作用,重点关注其对视网膜色素表皮 (RPE) 细胞和视网膜内的线粒体功能的影响.
评估PON2缺乏对视网膜结构和功能在AMD相关的氧化应激条件下的后果.

主要方法:

在氧化应激下检查了PON2在人类初级培养RPE (hRPE) 细胞中的线粒体定位和调节.
利用siRNA在RPE细胞中击败PON2,并测量了线粒体的生物能量.
使用NaIO₃的野生型 (WT) 和PON2缺乏的小鼠诱导视网膜退化,随后进行 fundus成像,OCT,ERG和组织学分析.

主要成果:

PON2局部化到hRPE细胞中的线粒体,其表达显示时间依赖的增加,然后在氧化应激下减少.
PON2 缺乏症加剧了由氧化应激引起的线粒体呼吸和ATP 生产的下降.
与WT小鼠相比,在NaIO₃治疗后,PON2缺乏的小鼠表现出更严重的视网膜退化,变薄,视觉功能减少 (棒和),亡增加,活性caspase 3水平升高.

结论:

PON2 缺乏导致RPE线粒体功能受损,并导致视网膜损伤和功能衰退.
这些发现表明PON2在视网膜病理生理学中起着保护作用,表明其作为AMD治疗点的潜力.

关键词:

在 RPE RPE 的情况下,线粒体的生物能量学氧化应激是一种氧化应激.帕洛克索纳酶的使用方法视网膜功能视网膜功能酸酸是一种

更多相关视频

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

Published on: May 6, 2015

Organotypic Retinal Explant Cultures from Macaque Monkey

Organotypic Retinal Explant Cultures from Macaque Monkey

Published on: August 24, 2022

相关概念视频

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

Protein Import into the Peroxisomes

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...