衰老细胞通过SASP-脂质15d-PGJ2介导的HRas修饰和控制来抑制小鼠肌细胞分化
Swarang Sachin Pundlik1,2, Alok Barik1, Ashwin Venkateshvaran1
1Metabolic Regulation of Cell Fate (RCF), Institute for Stem Cell Science and Regenerative Medicine (InStem), Bangalore Life Science Cluster, Bengaluru, India.
eLife
|August 28, 2024
概括
衰老细胞释放脂质15d-PGJ2,这会损害化疗后骨肌肉的再生. 抑制其产生恢复肌肉分化,为化疗引起的组织损伤提供治疗点.
科学领域:
- 细胞衰老 细胞衰老
- 骨肌肉生物学 骨肌肉生物学
- 脂质信号传递是什么
背景情况:
- 衰老细胞随着组织损伤而积累,并抑制再生,特别是在化疗后的骨肌肉中 (例如,多克索鲁比).
- 与衰老相关的分泌类型 (SASP) 包括调节组织平衡的脂质.
- 15-delta prostaglandin J2 (15d-PGJ2),是一种来自酸的脂质,在衰老细胞中积累.
研究的目的:
- 研究15d-PGJ2作为SASP因子在多克索鲁比诱导的衰老骨肌细胞中的作用.
- 阐明15d-PGJ2影响肌肉细胞分化和信号通路的机制.
- 探索针对15d-PGJ2的治疗潜力,以恢复肌肉平衡.
主要方法:
- 在C2C12小鼠骨肌细胞中诱导细胞衰老,使用Doxorubicin.
- 从衰老细胞中释放15d-PGJ2的分析及其对肌细胞分化的影响.
- 调查15d-PGJ2在Cys184的HRas的翻译后修饰及其对MAPK/Erk信号传递的影响.
主要成果:
- doxorubicin 诱导的衰老细胞释放 15d-PGJ2,抑制肌细胞融合和分化.
- 抑制PGD2合成酶 (L-PTGDS) 减少了15d-PGJ2的释放,并挽救了肌肉分化.
- 15d-PGJ2在Cys184的HRas中进行后翻译性修改,改变其本地化,RAF-RBD结合,并激活MAPK/Erk信号.
结论:
- 15d-PGJ2是一种关键的SASP因子,调解衰老细胞对骨肌肉再生的抑制作用.
- 针对15d-PGJ2的产生或其对HRas的下游影响,为恢复化疗后肌肉功能提供了一个潜在的策略.
- 了解衰老中的脂质介质对于开发针对与年龄相关的组织功能障碍的疗法至关重要.
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