类似AFX的叉头转录因子通过Ras和PKB通过p27kip1调节细胞循环调节
R H Medema1, G J Kops, J L Bos
1Department of Hematology, University Medical Center, Utrecht, The Netherlands.
Nature
|April 28, 2000
概括
像AFX这样的叉头转录因子通过阻止细胞循环进展来调节细胞生长. 这些因素的失活对于癌症的发展至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 叉头转录因子是调节各种细胞过程的保存蛋白质.
- C. elegans DAF-16,AFX,FKHR和FKHR-L1的正义词与细胞功能有关.
- 细胞生长的失调是癌症的一个标志.
研究的目的:
- 研究AFX类叉头转录因子在细胞循环调节中的作用.
- 在各种癌症模型中确定AFX过度表达对细胞生长的影响.
- 阐明AFX影响细胞循环进展的分子机制.
主要方法:
- 在多种细胞系中过度表达叉头转录因子 (AFX,FKHR,FKHR-L1).
- 使用流细胞计进行细胞周期分析,以评估G1阶段的进展.
- 西方涂抹用于评估细胞循环调节者的蛋白质水平,包括p27kip1.1.
- 对基因表达的分析,以确认AFX.p27kip1的转录激活.
主要成果:
- 过度表达AFX,FKHR和FKHR-L1抑制了多个细胞系的生长,包括Ras转化和PTEN缺乏细胞.
- 在G1阶段,AFX表达诱导细胞循环停止.
- 这种G1停止是独立于视网膜母细胞瘤蛋白 (pRb),但依赖于p27kip1.
- 证明AFX通过转录激活了p27kip1,导致p27kip1蛋白水平升高.
结论:
- 类似AFX的蛋白质在调节细胞循环进展方面发挥着重要作用.
- 该机制涉及细胞循环抑制剂p27kip1.1的转录激活.
- 像AFX这样的蛋白质的失活或丧失代表了瘤转化中的关键步骤,有助于不受控制的细胞增殖.
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