AKT2/SIRT5/TFEB通路作为非新血管性AMD的潜在治疗标
Sayan Ghosh1, Ruchi Sharma2, Sridhar Bammidi1
1Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
Nature communications
|July 21, 2024
概括
研究人员发现了一种新的AKT2/SIRT5/TFEB通路,对视网膜色素表皮的健康至关重要. 针对这种途径可能为与年龄相关的黄斑变性 (AMD) 提供一种新的治疗策略.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 干燥的与年龄相关的黄斑变性 (AMD) 涉及视网膜色素表皮质 (RPE) 变性.
- 溶解体对RPE健康至关重要,其功能由转录因子EB/E3 (TFEB/E3) 调节.
研究的目的:
- 研究AKT2/SIRT5/TFEB通路在RPE功能和干燥AMD病变发生过程中的作用.
- 为了确定干燥AMD的潜在治疗点.
主要方法:
- 研究了AKT2和SIRT5.5之间的相互作用.
- 分析了AKT2/SIRT5/TFEB通路调节对RPE溶酶体和线粒体功能的影响.
- 使用Akt2淘汰赛小鼠和诱导多能干细胞衍生的RPE与AMD风险变体.
主要成果:
- 增加的AKT2抑制PGC-1α,降低SIRT5的调节,这是AKT2的结合伙伴.
- AKT2/SIRT5/TFEB通路的抑制会破坏RPE的溶酶体和线粒体功能,导致德鲁森的形成.
- 在RPE中AKT2过度表达会在小鼠中导致干燥的AMD类表型.
- 患有CFH Y402H变异的RPE显示AKT2增加,损害了TFEB/E3依赖的溶酶体功能.
结论:
- AKT2/SIRT5/TFEB通路对于维持RPE lysosomal功能至关重要.
- 这种途径的失调有助于干燥的AMD发展.
- 准AKT2/SIRT5/TFEB通路为干性AMD提供了一个有希望的治疗途径.
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