卵巢外表达Oct-4阻断了原生细胞分化,并导致表皮组织的发育不良
Konrad Hochedlinger1, Yasuhiro Yamada, Caroline Beard
1Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
Cell
|May 11, 2005
概括
一个关键的胚胎基因Oct-4在体组织中重新激活时,可以诱导成年小鼠的癌症生长. 这表明成年原生细胞可以恢复到类似胚胎的状态,推动瘤的形成.
科学领域:
- 发育生物学 发展生物学
- 癌症生物学 癌症生物学
- 干细胞生物学 干细胞生物学
背景情况:
- Oct-4是一种POU域转录因子,对于维持胚胎干细胞多能性至关重要.
- 在胚胎细胞瘤和一些体质瘤中也检测到Oct-4,暗示了在瘤发生过程中的潜在作用.
- 在成年人体组织中,Oct-4的精确致癌性质和机制在很大程度上仍未被描述.
研究的目的:
- 在成年小鼠体组织中研究子宫外Oct-4表达的影响.
- 为了确定Oct-4是否可以诱导分化成体细胞中的瘤发生变化.
- 为了阐明导致Oct-4引起的发育不良的细胞机制.
主要方法:
- 在成年小鼠中使用了多西环素诱导系统来控制子宫外Oct-4表达.
- 在Oct-4激活时分析了上皮组织,特别是肠道的组织学和分子变化.
- 在Oct-4表达性病变中评估了原始细胞扩张和β-catenin转录活性.
主要成果:
- 成年小鼠的宫外Oct-4表达诱导了上皮组织中的失生性生长.
- 这些瘤依赖于持续的Oct-4表达,并以祖细胞扩张为特征.
- Oct-4抑制了肠道中的细胞分化,模仿其胚胎作用,并增加了β-catenin活性.
结论:
- 成人原生细胞可以保持对关键胚胎发育信号的响应能力.
- 胚胎因子Oct-4的宫外表达可以驱动成人体质组织中的瘤发生.
- 原生细胞的可塑性是癌症发病和进展的一个重要因素.
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