缺陷的拼接机械通过MDM4替代拼接促进衰老
Mathieu Deschênes1, Mathieu Durand1, Marc-Alexandre Olivier2,3
1Department of Microbiology and Infectious Diseases, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada.
Aging cell
|August 9, 2024
概括
拼接缺陷减少了拼接体组件,触发了细胞衰老. 这一过程改变了MDM4拼接,促进了衰老和细胞存活,影响了癌症等疾病.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 拼接机械的缺陷与各种疾病有关,包括癌症.
- 细胞衰老是一种不可逆转的生长停止状态,与衰老和疾病有关.
研究的目的:
- 为了研究拼接缺陷在细胞衰老中的作用.
- 探索拼接体组件减少和拼接抑制对衰老的影响.
- 确定与衰老相关的特定替代拼接事件及其对细胞存活的影响.
主要方法:
- 在衰老的人类细胞系中分析结合体组分表达.
- 使用拼接抑制剂 (herboxidiene,pladienolide B) 诱导衰老,并削减拼接细胞组件.
- 研究MDM4基因的替代拼接 (MDM4-FL和MDM4-S变体).
- 在不同的MDM4水平和MDM4-S表达下评估细胞存活率.
主要成果:
- 在复制性,压力诱导和端粒解封诱导的衰老中,观察到结合体组件和结合调节者的总体减少.
- 剪接抑制剂和剪接细胞组件的枯竭诱导了正常和癌细胞的衰老.
- 所有老化类型都表现出MDM4替代拼接从全长 (MDM4-FL) 转向短 (MDM4-S) 变体的转变.
- 减少内源MDM4促进衰老和细胞存活,同时增加MDM4-S也改善了细胞存活.
结论:
- 拼接缺陷是促进细胞衰老的一个重要因素.
- 通过拼接缺陷调节MDM4的替代拼接,有助于衰老和细胞存活.
- 向拼接通路可能为与衰老和癌症相关的疾病提供治疗策略.
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