Department of Oral Pathology, Yonsei University College of Dentistry, Seoul, 03722, Korea.
Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, 03722, Korea.
Nat Commun. 2018 Jun 12;9(1):2301. doi: 10.1038/s41467-018-04757-w.
Phosphorylation-dependent YAP translocation is a well-known intracellular mechanism of the Hippo pathway; however, the molecular effectors governing YAP cytoplasmic translocation remains undefined. Recent findings indicate that oncogenic YAP paradoxically suppresses Wnt activity. Here, we show that Wnt scaffolding protein Dishevelled (DVL) is responsible for cytosolic translocation of phosphorylated YAP. Mutational inactivation of the nuclear export signal embedded in DVL leads to nuclear YAP retention, with an increase in TEAD transcriptional activity. DVL is also required for YAP subcellular localization induced by E-cadherin, α-catenin, or AMPK activation. Importantly, the nuclear-cytoplasmic trafficking is dependent on the p53-Lats2 or LKB1-AMPK tumor suppressor axes, which determine YAP phosphorylation status. In vivo and clinical data support that the loss of p53 or LKB1 relieves DVL-linked reciprocal inhibition between the Wnt and nuclear YAP activity. Our observations provide mechanistic insights into controlled proliferation coupled with epithelial polarity during development and human cancer.
磷酸化依赖性 YAP 易位是 Hippo 通路的一个众所周知的细胞内机制;然而,控制 YAP 细胞质易位的分子效应物仍未定义。最近的研究结果表明,致癌 YAP 反常地抑制 Wnt 活性。在这里,我们表明 Wnt 支架蛋白 Dishevelled(DVL)负责磷酸化 YAP 的细胞质易位。DVL 中嵌入的核输出信号的突变失活导致核 YAP 保留,TEAD 转录活性增加。DVL 还需要 E-钙粘蛋白、α-连环蛋白或 AMPK 激活诱导的 YAP 亚细胞定位。重要的是,核质转运依赖于 p53-Lats2 或 LKB1-AMPK 肿瘤抑制轴,它们决定 YAP 的磷酸化状态。体内和临床数据支持,p53 或 LKB1 的缺失减轻了 Wnt 和核 YAP 活性之间由 DVL 连接的相互抑制。我们的观察结果为发育过程中和人类癌症中与上皮极性相关的受控增殖提供了机制见解。