STRIPAK Integrates Upstream Signals to Initiate the Hippo Kinase Cascade

Overview

Journal Nat Cell Biol

Specialty Cell Biology

Date 2019 Dec 4

PMID 31792377

Citations 68

Authors

Rui Chen

Ruiling Xie

Zhipeng Meng

Shenghong Ma

Kun-Liang Guan

Affiliations

Soon will be listed here.

Abstract

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.

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