相关实验视频
Updated: May 14, 2026

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Assaying Protein Kinase Activity with Radiolabeled ATP
Published on: May 26, 2017
通过蛋白激酶RIPK4对Dishevelled的酸化调节了Wnt信号传递
XiaoDong Huang1, James C McGann, Bob Y Liu
1Department of Physiological Chemistry, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
概括
受体相互作用蛋白激酶4 (RIPK4) 通过稳定β-catenin激活Wnt信号,影响表皮发育,并可能驱动瘤生长. 这一发现揭示了RIPK4的存在.
科学领域:
- 细胞信号传递途径 细胞信号传递途径
- 分子生物学分子生物学
- 发育生物学是发展生物学.
背景情况:
- 受体相互作用蛋白激酶4 (RIPK4) 对于表皮分化至关重要,并与巴特索卡斯-帕帕斯综合征有关.
- 已知RIPK4与蛋白激酶C的相互作用,但其精确的信号机制在很大程度上仍未被阐明.
- 了解RIPK4在信号传递中的作用对于理解表皮发育和相关遗传疾病至关重要.
研究的目的:
- 研究受体相互作用蛋白激酶4 (RIPK4) 的信号机制.
- 确定RIPK4在Wnt信号通路中的作用.
- 探索RIPK4功能和突变对发育和疾病的影响.
主要方法:
- 在细胞培养中野生类型和突变RIPK4的异胎表达.
- 对细胞质β-catenin积累和下游转录变化的分析.
- 在Xenopus胚胎中的实验使用Ripk4形态和与Xwnt8.8共同表达的Ripk4形态.
- 同免疫沉测试以确定RIPK4相互作用伙伴.
- 在异种移植模型中评估RIPK4对Wnt依赖性瘤细胞生长的影响.
主要成果:
- 异位RIPK4,但不包括非活性或突变形式,诱导β-catenin积累和Wnt类的转录程序.
- 在Xenopus中,Ripk4增强了Wnt信号传递,而Ripk4抑制或非活跃突变体对抗了它.
- RIPK4与DVL2形成相互作用,并在Wnt3a刺激后与LRP6.6相互作用.
- 通过RIPK4介导的DVL2酸化促进了正规的Wnt信号传递.
- RIPK4倒置抑制了人类瘤异种移植的Wnt依赖生长.
结论:
- RIPK4作为正规Wnt信号的积极调节者,影响β-catenin稳定性和下游基因表达.
- RIPK4与DVL2和LRP6的相互作用对于其在Wnt通路激活中的作用至关重要.
- 异常的RIPK4活性或过度表达可能通过促进Wnt-依赖的生长来促进某些癌症的发病.
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