人类癌症中蛋白质相互作用组分析发现的DNA修复中的cyclin D1的功能
Siwanon Jirawatnotai1, Yiduo Hu, Wojciech Michowski
1Department of Cancer Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|June 10, 2011
概括
细胞循环蛋白Cyclin D1意外地通过在损伤部位结合RAD51来帮助DNA修复. 抑制cyclin D1可以治疗视网膜母细胞瘤阴性癌症,扩大其治疗潜力.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- DNA 修复机制的修复机制
背景情况:
- 环素D1是一种关键的细胞循环调节剂,在人类癌症中经常过度表达.
- 除了细胞周期进展之外,它在癌症中的确切作用仍然不完全理解.
研究的目的:
- 在人类癌症中识别cyclin D1的新型分子功能.
- 为了研究环素D1和DNA修复途径之间的相互作用.
主要方法:
- 蛋白质性查以确定人类瘤中的cyclin D1相互作用蛋白.
- 共同免疫沉和免疫光以研究蛋白质相互作用和局部化.
- 评估DNA修复能力和细胞在循环D1耗尽后对辐射的敏感性.
主要成果:
- 蛋白质组分析显示,环林D1与DNA修复蛋白相互作用,特别是RAD51.1.
- 环素D1直接与RAD51结合,这种相互作用是辐射诱导和BRCA2依赖的.
- 循环D1的枯竭会损害RAD51对DNA损伤部位的招募,阻碍同源重组修复,并增加辐射敏感性,即使在视网母细胞瘤阴性癌细胞中.
结论:
- 环素D1在同源重组介导的DNA修复中具有以前未知的功能.
- 向cyclin D1可能为视网膜母细胞瘤阴性癌症提供治疗益处,这一群体通常不被认为对cyclin D1抑制有反应.
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