河马信号通路
罗亚
细胞生物学
激酶
生物
脱磷
磷酸化
信号转导
调节器
磷酸酶
生物化学
基因
作者
Rui Chen,Ruiling Xie,Zhipeng Meng,Shenghong Ma,Kun‐Liang Guan
标识
DOI:10.1038/s41556-019-0426-y
摘要
The Hippo pathway plays a critical role in development, tissue homeostasis and organ size; its dysregulation contributes to human diseases. Although MST1/2 and the MAP4Ks are well known as the Hippo kinases, a major open question is how these kinases are regulated by upstream signals. Here we report that STRIPAK integrates upstream signals to control the activities of MST1/2 and the MAP4Ks, thus initiating Hippo signalling. STRIPAK also serves as a master regulator for the STE20 family kinases. Following serum or lysophosphatidic acid stimulation, active RhoA binds and dissociates rhophilin and NF2/Kibra from STRIPAK, thereby inducing the association and dephosphorylation of MST1/2 and MAP4Ks by the STRIPAK phosphatase catalytic subunit PP2AC. Rhophilin suppresses cancer cell growth by activating the Hippo pathway. Our study reveals a RhoA–rhophilin–NF2/Kibra–STRIPAK signalling axis in Hippo regulation, thus addressing the key question of how Hippo signalling is initiated and suggesting a broad and active role for STRIPAK in cellular signalling. Chen et al. show that, after serum or lysophosphatidic acid stimulation, RhoA dissociates rhophilin and NF2/Kibra from STRIPAK to control MST1, MST2 and MAP4Ks to regulate Hippo signalling.
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