cTAGE5/MEA6 规范LBR定位,以维护核包裹的完整性和防止老化
Yaqing Wang1, Pengyu Sun1,2, Fuqiang Yang1,2
1State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
Aging cell
|July 31, 2025
概括
蛋白质cTAGE5 (含有酸性域5的细胞质尾蛋白) 对核包膜完整性至关重要. 它的缺乏导致过早衰老和细胞衰老,因为它破坏了层状B受体局部化.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 衰老研究研究 衰老研究
背景情况:
- 众所周知,蛋白质cTAGE5/MEA6对于COPII复合体组合,ER-to-Golgi贩运和分泌至关重要.
- 除了蛋白质运输之外,cTAGE5/MEA6的更广泛的细胞功能仍然在很大程度上未被探索.
研究的目的:
- 调查cTAGE5/MEA6在细胞功能中的潜在作用,超出其在蛋白质贩运中的既定作用.
- 阐明与cTAGE5/MEA6缺乏相关的观察到的表型背后的机制.
主要方法:
- 在小鼠和小鼠胚胎纤维细胞 (MEF) 细胞中条件淘汰cTAGE5.
- 对核结构,细胞增殖和蛋白质定位的分析.
- 调查cTAGE5和层状B受体 (LBR) 之间的相互作用.
- 对P53/P21衰老通路激活的评估.
主要成果:
- 条件cTAGE5淘汰导致成年小鼠的胚胎死亡率和过早衰老.
- 在MEF细胞中cTAGE5缺乏导致异常的核结构和受损的细胞增殖.
- 发现cTAGE5与LBR相互作用,其损失破坏了LBR到内核膜的局部化,导致LBR在ER中保留.
- 破坏LBR局部化导致异常的核外形态和细胞衰老,与P53/P21通路激活相关.
结论:
- cTAGE5在维护核外完整性方面发挥着至关重要的作用.
- cTAGE5的功能是通过确保适当的LBR定位和核外结构来防止细胞衰老和动物衰老.
- 这些发现揭示了cTAGE5在核生物学和衰老中的新功能.
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