通过全跨视网膜激活GSDME会增加对光受体铁的敏感性
Bo Yang1,2, Kunhuan Yang1,2, Yuling Chen1,2
1Xiamen Eye Center and Eye Institute of Xiamen University, School of Medicine, Xiamen University, Xiamen, Fujian 361003, China.
International journal of biological sciences
|November 24, 2025
概括
全透视视网膜 (atRAL) 清除受损导致Stargardt病和AMD中的视力丧失. 通过atRAL激活Gasdermin E (GSDME) 驱动光受体细胞死亡,但阻断GSDME或线粒体ROS可以防止这种损伤.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 分子医学是分子医学.
背景情况:
- 全透视网膜 (atRAL) 清除受损导致斯塔格特病1型 (STGD1) 的光受体缩以及与年龄相关的干性黄斑变性 (AMD).
- 光诱导的atRAL积累促进铁亡,并在小鼠模型 (Abca4-/-Rdh8-/-) 的视网膜光受体中激活气体皮质E (GSDME).
- 在此之前,GSDME在光受体铁中所扮演的特定角色尚不清楚.
研究的目的:
- 研究GSDME在atRAL诱导的光受体铁和视网膜退化中的作用.
- 确定GSDME激活是否是STGD1和干性AMD模型中视网膜损伤的关键媒介.
主要方法:
- 使用Abca4-/-Rdh8-/-小鼠,一个表现出视觉循环障碍的模型.
- 生成的GSDME淘汰赛小鼠和光受体特定的Gsdme淘汰赛小鼠.
- 使用了线粒体反应性氧物种 (mitoROS) 清除剂MitoTEMPO.
- 评估了光受体铁,视网膜缩,线粒体损伤,氧化应激和脂质过氧化.
主要成果:
- 通过atRAL激活GSDME引发光受体铁,线粒体损伤和氧化应激,导致视网膜缩.
- 淘汰GSDME显著减弱的光感应光受体铁和视网膜退化在Abca4-/-Rdh8-/-小鼠.
- 在光受体中删除 Gsdme 通过抑制 mitoROS 生产,铁过载和脂质过氧化来预防atRAL 诱导的铁.
- 在暴露于光线的小鼠中,MitoTEMPO治疗减轻了ferroptosis和缓解了光受体退化.
结论:
- 由GSDME介导的光受体铁是导致视网膜损伤的关键机制,与atRAL积累相关的视网膜病变.
- 阻止 GSDME 激活或准 mitoROS 为STGD1 和干 AMD 提供了潜在的治疗策略.
- 这项研究阐明了一种新的途径,将RAL积累,GSDME和视网膜退化中的铁亡联系起来.
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