在体细胞重编程过程中,OCT4在胚胎外内皮干细胞 (XEN) 细胞原始体中表达
Alexandra Moauro1,2, Stephanie L Hickey3, Michael A Halbisen3
1Molecular, Cellular and Integrative Physiology Ph.D. Program, Michigan State University, East Lansing, MI, 48824.
bioRxiv : the preprint server for biology
|February 8, 2024
概括
在重编程过程中,即使没有Oct4过度表达,也会形成诱导的XEN细胞. 这表明,XEN细胞发育的自然途径是建立多能性的组成部分,反映了早期胚胎发育.
科学领域:
- 干细胞生物学 干细胞生物学
- 发育生物学是发展生物学.
- 细胞重新编程的细胞重编程.
背景情况:
- 胚胎干细胞 (ES) 和胚胎外内皮干细胞 (XEN) 在小鼠胚胎细胞发育过程中从内部细胞质 (ICM) 共同产生.
- 使用Oct4,Sox2,Klf4,Myc (OSKM) 的体细胞重编程产生诱导的多能干细胞 (iPS) 和诱导的XEN (iXEN) 细胞.
- 在重编程过程中Oct4在产生两种细胞类型中的作用尚未完全理解,尽管它与非多能结局有关.
研究的目的:
- 在OSKM重编程过程中研究iXEN细胞形成的机制.
- 为了确定Oct4过度表达是否对iXEN细胞诱导至关重要.
- 在重编程过程中探索XEN细胞命运和多能性建立之间的关系.
主要方法:
- 使用Oct4-GFP记者小鼠在OSKM重编程过程中跟踪细胞命运.
- 进行重编程实验,并没有Oct4过度表达.
- 在不同的重编程条件下分析iXEN细胞形成 (OSKM与SKM).
主要成果:
- 在OSKM重编程过程中,显著比例的Oct4-GFP表达细胞被注定成为iXEN细胞.
- 单独的Sox2,Klf4,Myc (SKM) 足以诱导iXEN细胞的形成,这表明内源性Oct4激活.
- iXEN细胞的形成不仅仅是外源性Oct4过度表达的产物.
结论:
- iXEN细胞的生成并不完全依赖于Oct4的过度表达.
- 一条XEN细胞分化的途径似乎是重编程期间多能性建立过程的内在组成部分.
- 这些发现与早期胚胎发育中的ES和XEN细胞原始体的同时规范相似.
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