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化c-Jun与TCF4的相互作用调节了肠癌的发展
Abdolrahman S Nateri1, Bradley Spencer-Dene, Axel Behrens
1Mammalian Genetics Laboratory, CR UK London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
Nature
|July 12, 2005
概括
通过c-Jun N-终端激酶 (JNKs) 酸化原核蛋白c-Jun,增强其与TCF4的相互作用,促进肠道瘤的生长. 抑制这种相互作用减少了瘤的发展,突出了WNT驱动的瘤发生的关键调节机制.
科学领域:
- 分子生物学分子生物学
- 在瘤学瘤学.
- 细胞信号传递 细胞信号传递
背景情况:
- 原蛋白c-Jun是AP-1转录因子的关键组成部分,其活性在许多癌症中升高.
- 通过c-Jun N-终端激酶 (JNKs) 对c-Jun的氨基终端酸化显著增强了AP-1活性和生物功能.
- 酸化c-Jun的活性增加,部分原因是它增强了结合其他蛋白质的能力.
研究的目的:
- 研究c-Jun酸化在调节与转录因子TCF4.4相互作用中的作用.
- 阐明一个涉及c-Jun,TCF4和β-catenin的三元复合体的形成.
- 确定c-Jun/TCF4相互作用对肠道瘤发生和WNT信号通路的影响.
主要方法:
- 染色体免疫沉试验检测JNK-依赖的c-jun-TCF4相互作用在c-jun促进体上.
- 报告员测试以评估c-Jun和TCF4对c-jun促进者的合作激活,以β-catenin依赖的方式.
- 使用Apc(Min) 鼠标模型来评估废除c-jun酸化或c-jun无活化对肠道瘤发展的体内影响.
主要成果:
- 证明化c-Jun与TCF4相互作用,与β-catenin形成三元复合体.
- 确认了依赖JNK的c-jun-TCF4与c-jun促进体结合.
- 表明c-Jun和TCF4通过β-catenin合作激活c-jun促进体.
- 在小鼠中,c-Jun酸化或条件c-jun无活化的遗传废除显著减少了肠道瘤的数量和大小,延长了寿命.
结论:
- c-Jun和TCF4之间的酸化依赖相互作用是肠道瘤发生的关键调节者.
- 这种相互作用整合了JNK和APC/β-catenin信号通路,两者都由WNT信号激活.
- 针对c-Jun/TCF4相互作用代表了针对WNT驱动的肠癌的潜在治疗策略.
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