肠细胞中的多胞体错调驱动着老化的Drosophila肠道中的组织衰退
Sarah M Leichter1, Kami Ahmad1, Steven Henikoff2,3
1Basic Sciences Division, Fred Hutchinson Cancer Center, Seattle, Washington 98109, USA.
Genome research
|November 17, 2025
概括
衰老通过改变分化细胞中的染色素来破坏肠道屏障功能,而不仅仅是干细胞. 肠细胞中的这种与年龄相关的染色质失调反映了癌症的现象.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 衰老研究研究 衰老研究
- 基因组学就是基因组学.
背景情况:
- 衰老会损害肠道完整性,而Polycomb抑制失调与肠道衰老有关.
- 在衰老过程中分化肠道细胞中的Polycomb景观在很大程度上是未知的.
- 不同化的细胞显著影响组织和生物体的衰老.
研究的目的:
- 为了研究Drosophila*肠道老化过程中的细胞类型特定的染色质变化.
- 了解Polycomb介导的H3K27me3修饰在老化的分化肠道细胞中的作用.
- 探索与衰老相关的染色质变化与癌症进展之间的联系.
主要方法:
- 在 *Drosophila* 肠道的单细胞染色质分析.
- 对Polycomb介导的H3K27me3基因素修饰的分析.
- 对基因表达和RNA聚合酶II活性进行评估.
主要成果:
- 老肠细胞异常抑制涉及跨膜运输和酸盐代谢的基因,损害了肠道屏障.
- 屏障下降触发了JAK/STAT信号,导致衰老干细胞的增多.
- 老化的干细胞在基因组基因中呈现高RNA聚合酶II,类似于人类的侵袭性癌症.
结论:
- 在分化的细胞中Policomb的错误调节有助于肠道衰老和组织衰退.
- 肠道中因衰老引起的染色质变化与癌症中的转录性变化有共同之处.
- 失调的Polycomb抑制通过共同的分子机制将衰老和癌症进展联系在一起.
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