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替代Wnt信号轴导致瘤基因诱导衰老的断裂
Viola Kluge1, Melanie Kappelmann-Fenzl1,2, Stefan Fischer2
1Institute of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.
Cell death & disease
|February 22, 2024
概括
研究人员发现了一种新的信号通路,涉及YAP和Wnt分子,允许黑色素瘤细胞绕过基因诱导衰老 (OIS). 这一发现揭示了推动黑色素瘤发展的关键机制,并提供了潜在的治疗点.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 瘤基因诱导衰老 (OIS) 是一个关键的瘤抑制机制.
- 黑色素细胞中的BRAFV600E突变可以通过克服OIS导致黑色素瘤,但潜在的机制尚不清楚.
- 在OIS和黑色素瘤细胞中诱导了YAP (YES相关蛋白) 活性,这表明其作用可能涉及改变的相互作用,而不是激活本身.
研究的目的:
- 研究BRAFV600E突变的黑色素细胞克服OIS的分子机制.
- 探索YAP和Wnt信号在黑色素瘤进展和OIS回避中的作用.
- 确定参与黑色素瘤发展的新型相互作用伙伴和信号通路.
主要方法:
- 使用一种已建立的OIS模型,用BRAFV600E转换的初级黑色素细胞.
- 研究了YAP活动和Wnt信号激活 (使用AMBMP).
- 在黑色素瘤细胞中进行了Wnt6,Wnt10b和β-catenin的基因枯竭研究.
- 分析了YAP-β-catenin对DNA和下游基因表达变化的相互作用.
主要成果:
- 在OIS和黑色素瘤细胞中诱导了YAP活性.
- 在BRAFV600E转的黑色素细胞中,Wnt信号激活破坏了OIS.
- 在黑色素瘤细胞中减少Wnt6,Wnt10b或β-catenin诱导的衰老.
- 发现β-catenin作为YAP在黑色素瘤细胞中的DNA结合相互作用伙伴.
- 在β-catenin-YAP的相互作用转移了基因表达从老化稳定到瘤支持基因通过LEF1/TEAD联合激活.
- 参与rRNA处理的目标基因,由LEF1/TEAD调节,与黑色素瘤预后不佳相关.
结论:
- 一个替代的YAP-Wnt信号轴对于破坏黑色素细胞中的OIS至关重要.
- YAP和β-catenin之间的相互作用改变了基因表达,促进了瘤的进展.
- 这一途径代表了黑色素瘤发展的新型分子机制,并表明了潜在的治疗点.
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