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用白胺治疗的肌细胞经历了与p21相关的细胞衰老,并严重损害了分化能力
Michael Kamal1, Sophie Joanisse1,2, Gianni Parise3
1Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada.
GeroScience
|September 26, 2023
概括
细胞衰老会影响骨肌肉干细胞 (卫星细胞) 的再生. 这项研究开发了一种白素诱导的肌细胞衰老模型,揭示了p21升高和肌肉修复受损,突出了多标志物衰老分类的必要性.
科学领域:
- 肌肉干细胞生物学 肌肉干细胞生物学
- 细胞衰老 细胞衰老
- 衰老的研究研究.
背景情况:
- 骨肌肉再生随着年龄的增长而下降,部分原因是卫星细胞 (SC) 功能障碍.
- 细胞衰老,一种不可逆转的细胞循环停止状态,与衰老期间的SC损伤有关.
- 骨肌干细胞中衰老的确切作用和分类仍然不清楚.
研究的目的:
- 建立一个可靠的老化模型在骨肌肉肌细胞.
- 在这个模型中研究常见的衰老相关生物标志物的反应.
- 了解诱导衰老对肌细胞增殖和分化潜力的影响.
主要方法:
- 低通道C2C12神经细胞被用白素治疗,以诱导DNA损伤和衰老.
- 评估了细胞学和分子衰老标志物,包括p21,p16和与衰老相关的β-galactosidase.
- 评估了细胞增殖,细胞周期动力学 (G2/M停止) 和分化成肌管的能力.
主要成果:
- 布莱米辛诱导了双链DNA断裂,通过NF-κB和SASE信号传递对p21进行上调.
- 由于G2/M相停止,细胞增殖显著减少.
- 与衰老相关的β-galactosidase染色增加,肌细胞在分化后显示肌管形成受损.
- 即使没有p16基因表达,衰老仍然存在,这表明复杂的调节.
结论:
- 布莱奥米辛治疗是损伤诱导的骨肌肉肌细胞衰老的有效模型.
- 诱导衰老的特征是p21升高,增殖减少,细胞周期动力学发生变化.
- 精确的骨肌衰老的分类需要多标记者的方法,因为p16并不总是必不可少的.
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