在高葡萄糖下,TIN2介导的线粒细胞衰减会诱导RPE衰老
Shuchang Zhang1, Shimei Chen1, Dandan Sun1
1Department of Ophthalmology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Ocular Fundus Diseases, Shanghai Engineering Center for Visual Science and Photomedicine, National Clinical Research Center for Eye Diseases, Shanghai Engineering Center for Precise Diagnosis and Treatment of Eye Diseases, Shanghai, China.
Cellular signalling
|April 24, 2024
概括
线粒体局部化的TIN2蛋白增加加速了糖尿病视网膜病变 (DR) 中视网膜色素上皮 (RPE) 细胞衰老. 准TIN2可能通过改善线粒和减少氧化应激来为DR提供新的治疗策略.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 糖尿病学 糖尿病学
背景情况:
- 糖尿病视网膜病变 (DR) 是糖尿病的一种并发症,影响视网膜色素上皮细胞 (RPE).
- 端粒相关蛋白TIN2在DR中RPE细胞衰老中的作用尚不清楚.
- TIN2定位在端粒和线粒体上,这表明它可能在细胞应激反应中发挥作用.
研究的目的:
- 在糖尿病视网膜病变的背景下,研究TIN2在RPE细胞衰老中的作用.
- 探索TIN2作为DR的潜在治疗点.
- 阐明TIN2在高血糖条件下影响RPE细胞健康的机制.
主要方法:
- 对于TIN2表达和线粒细胞衰变,西式涂抹和免疫光.
- 用RT-qPCR进行衰老相关分泌表型 (SASP) 分析.
- 传输电子显微镜 (TEM),SA-β-染,以及用于RPE衰老和线粒体评估的细胞周期分析.
- 在小鼠模型中进行光学连贯断层扫描 (OCT) 和免疫组织化学.
- 二乙 (DHE) 染色和ZO-1免疫光用于氧化应激和紧密结合完整性.
主要成果:
- 线粒体TIN2升高加剧了RPE细胞衰老在体外和体内高血糖症下.
- 过度表达TIN2激活了mTOR信号通路,在高葡萄糖条件下抑制了线粒细胞吸收,这种效应被拉巴素逆转.
- 在高葡萄糖中,TIN2倒置降低了RPE衰老和线粒体氧化应激.
- 在DR小鼠模型中,TIN2敲击恢复了视网膜厚度和RPE紧接口完整性.
结论:
- 线粒体TIN2的增加通过受损的线粒体细胞衰老和激活的mTOR信号诱导RPE细胞衰老.
- 准TIN2为糖尿病视网膜病变提供了一个有前途的治疗策略.
- 线粒体TIN2是糖尿病视网膜病变期间RPE功能障碍的一个关键因素.
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