与年龄相关的RAB9积累扰乱了卵细胞半转化
Min Gao1,2,3, Fang Wang4, Tengteng Xu1,2,5
1Key Laboratory of Reproductive Medicine of Guangdong Province, The First Affiliated Hospital and School of Life Sciences, Sun Yat-Sen University, Guangzhou, China.
Aging cell
|December 15, 2024
概括
在老化的卵细胞中积累的RAB9 GTPase会损害化,降低发育潜力. 降低老卵中的RAB9水平可以部分恢复成熟,线粒体功能和螺旋体完整性,这表明对卵细胞衰老的治疗点.
科学领域:
- 生殖生物学 生殖生物学
- 细胞衰老 细胞衰老
- 分子遗传学 分子遗传学
背景情况:
- RAB9 GTPase在卵细胞衰老中的作用基本上是未知的.
- RAB9 GTPase 是囊泡贩运的一个关键调节剂.
研究的目的:
- 为了研究RAB9 GTPase在卵细胞半转移和衰老中的作用.
- 为了确定RAB9 GTPase水平是否会随卵细胞年龄而变化,并影响卵细胞质量.
主要方法:
- 免疫光显微镜以确定RAB9的定位.
- 西部涂抹测量年轻和老卵子中的RAB9蛋白水平.
- 卵细胞成熟测定,螺旋和染色体分析,以及在野生类型和Rab9-过度表达卵细胞中的线粒体功能评估 (ROS,ATP,膜潜力,mtDNA/nDNA比率).
- 评估线粒细胞衰变通路的激活 (PINK1/PARKIN).
- 干预研究减少老化卵细胞中的RAB9表达.
主要成果:
- RAB9 GTPase 在老人和老鼠卵细胞中积累.
- 增加的RAB9抑制了第一极体挤出,破坏了线形成和染色体对齐,并损害了发育潜力.
- 过度表达Rab9会加剧氧化压力,降低线粒体功能,并激活线粒体.
- 在老化的卵细胞中减少RAB9部分挽救了成熟率,线粒体功能和螺旋体完整性.
结论:
- RAB9 GTPase在维持卵细胞中介和线粒体功能方面发挥着至关重要的作用.
- 与年龄相关的RAB9积累有助于卵细胞质量下降.
- 减少RAB9的表达可能是一个可行的策略,以抵消与年龄相关的卵细胞恶化.
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