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诱导多能干细胞衍生纤维细胞有效地参与衰老路径,但对压力诱导物的敏感性增加
Marie-Lyn Goyer1,2, Cynthia Desaulniers-Langevin1,2, Anthony Sonn1,2
1Centre de Recherche du CHU Sainte-Justine, 3175 Côte Sainte-Catherine, Montréal, QC H3T 1C5, Canada.
Cells
|May 24, 2024
概括
诱导多能干细胞衍生纤维细胞 (i-HF) 维持DNA修复和衰老路径. 然而,i-HF表现出更高的应激敏感性和衰老,这可能会限制它们在细胞治疗中的使用.
科学领域:
- 干细胞生物学 干细胞生物学
- 细胞衰老 细胞衰老
- DNA 修复机制的修复机制
背景情况:
- 诱导多能干细胞 (iPSCs) 对再生医学至关重要.
- 在iPSC重编程过程中,瘤抑制基因 (TP53,CDKN2A) 暂时失活,引发了对异常细胞生长的担忧.
- 评估iPSC衍生的细胞中的DNA损伤反应和衰老对于安全至关重要.
研究的目的:
- 评估来自iPSC的人类纤维细胞 (i-HF) 的DNA双链断裂 (DSB) 修复和细胞衰老途径.
- 为了比较i-HF的DNA损伤反应与它们的亲人纤维细胞 (HF).
- 确定i-HF中衰老通路完整性的功能影响,用于细胞治疗应用.
主要方法:
- 转录组学分析以确定基因表达差异.
- 功能测试以评估衰老和DSB修复能力.
- 使用电离辐射 (IR) 和H-RASV12过度表达诱导DNA损伤.
主要成果:
- i-HF显示完整的衰老入口和DSB损坏后的修复能力.
- 转录组分析显示,i-HF在转录上与HF不同,具有增强的代谢活性和与p53相关的基因表达.
- i-HF表现出增加的压力敏感性,高老化相关的分泌表型 (SASP),并需要p53敲击永久化.
结论:
- 尽管在重新编程过程中暂时 TP53/CDKN2A 失活,但来自 iPSC 的人体纤维细胞 (i-HF) 没有表现出转变的风险增加.
- 在i-HF中衰老通路的过度激活可能会损害它们作为细胞治疗产品的功能.
- 需要进一步的研究来优化i-HF的治疗用途,通过管理衰老途径.
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