C/EBPα使B细胞迅速重新编程成诱导的多能干细胞
Bruno Di Stefano1, Jose Luis Sardina2, Chris van Oevelen2
11] Gene Regulation, Stem Cells and Cancer Programme, Centre for Genomic Regulation (CRG), Dr Aiguader 88, 08003 Barcelona, Spain [2] Universitat Pompeu Fabra (UPF), Dr Aiguader 88, 08003 Barcelona, Spain.
Nature
|December 17, 2013
概括
CCAAT/增强剂结合蛋白-α (C/EBPα) 通过增加色素可访问性来增强诱导的多能干细胞 (iPS) 重编程. 它还调节Tet2,这是一种对去甲基化多能基因至关重要的二氧化酶,并将iPS细胞生成与B细胞转基因差异化联系起来.
科学领域:
- 细胞生物学 细胞生物学
- 干细胞研究 干细胞研究
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 已知CCAAT/增强剂结合蛋白-α (C/EBPα) 诱导B细胞转分为巨细胞,并增强诱导的多能干细胞 (iPS) 细胞重编程,当与Oct4,Sox2,Klf4和Myc (OSKM) 结合使用时.
- 通过C/EBPα发挥这些效应的确切机制在很大程度上仍未被阐明.
研究的目的:
- 研究C/EBPα介导的iPS细胞重编程和B细胞转分化的基础机制.
- 在这些细胞转化过程中,确定参与C/EBPα功能的关键分子参与者.
主要方法:
- 利用小鼠初级B细胞进行重编程实验.
- 在过渡C/EBPα表达和随后的OSKM激活后评估iPS细胞重编程效率和多能性基因表达.
- 使用DNase I灵敏度测试研究了染色质可访问性.
- 在重编程过程中检查了Tet2的作用和本地化.
- 过度表达的Tet2,以评估其对重新编程效率的影响.
主要成果:
- 在95%的小鼠初级B细胞中,短暂的C/EBPα表达,随后的OSKM激活显著提高了iPS细胞重编程效率,在95%的小鼠初级B细胞中提高了100倍.
- 多能性和上皮-介质细胞过渡基因显著上调,60%的细胞在两天内表达了Oct4.
- 通过暂时增加多能性基因的染色质可访问性,C/EBPα充当了"路径突破者".
- C/EBPα诱导了Tet2表达和核转位,其中Tet2与多能性基因的调节区域结合,促进其脱甲基化.
- Tet2过度表达增强了OSKM诱导的重编程,而Tet2对于C/EBPα诱导的B细胞转化至关重要.
结论:
- 在C/EBPα诱导的B细胞转分化和增强的iPS细胞重编程之间,Tet2起着关键的机械联系作用.
- 这些发现揭示了C/EBPα在调节染色质可访问性和Tet2活性以实现有效的细胞重编程方面的新角色.
- 这种快速重编程方法为进一步的机制研究和再生医学中的临床应用提供了潜力.
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