在p16和p21阳性的细胞中,在人类和老鼠老化组织中存在不同的老型
Dominik Saul1,2,3,4, Diana Jurk5,6, Madison L Doolittle7,5
1Division of Endocrinology, Mayo Clinic, Rochester, MN, 55905, USA. dominik.saul@med.uni-goettingen.de.
The EMBO journal
|October 30, 2025
概括
由p21Cip1和p16Ink4a标记的细胞衰老,显示出在衰老中扮演着不同的角色. 这些标记物及其相关的衰老相关分泌表型 (SASP) 是细胞和组织特异性的,不可互换.
科学领域:
- 老年学和细胞生物学
- 衰老的分子机制
- 衰老的生物标志物
背景情况:
- 细胞衰老通过衰老相关的分泌表型 (SASP) 导致与年龄相关的组织功能障碍.
- 循环素依赖性激酶抑制剂p21Cip1和p16Ink4a是已确定的细胞衰老标志物,但它们在体内独特的作用尚未完全理解.
研究的目的:
- 在体内全面研究p21Cip1和p16Ink4a在不同细胞类型和组织的细胞衰老中的异质性和不同作用.
- 描述与p21Cip1和p16Ink4a表达相关的衰老相关分泌表现型 (SASP) 配置文件及其发育轨迹.
主要方法:
- 来自小鼠和人类老化组织的多个单细胞RNA测序数据集的分析.
- 应用RNA速度和伪时间分析来推断细胞状态动态.
- 与p21Cip1和p16Ink4a相关的SASP因子表达的比较分析.
主要成果:
- p21Cip1和p16Ink4a的表达表现出显著的异质性和缺乏跨多种细胞类型和组织的共同表达.
- 独特的,特定于组织的SASP配置文件与p21Cip1与p16Ink4a表达有关.
- RNA速度和伪时间分析揭示了p21+和p16+细胞的独立轨迹动态,没有观察到直接过渡.
结论:
- 细胞衰老和SASP是高度多样化和上下文依赖的,因细胞类型和组织而异.
- p21Cip1和p16Ink4a代表衰老过程中的不同的细胞状态,每个细胞都有独特的SASP特征和发育路径.
- 尽管整体异质性,但保留的一组SASP核心因子可能会调解常见的衰老相关功能.
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