Rap1 Negatively Regulates the Hippo Pathway to Polarize Directional Protrusions in Collective Cell Migration

Cell Reports
Yu-Chiuan ChangAnna C-C Jang

Abstract

In collective cell migration, directional protrusions orient cells in response to external cues, which requires coordinated polarity among the migrating cohort. However, the molecular mechanism has not been well defined. Drosophila border cells (BCs) migrate collectively and invade via the confined space between nurse cells, offering an in vivo model to examine how group polarity is organized. Here, we show that the front/back polarity of BCs requires Rap1, hyperactivation of which disrupts cluster polarity and induces misoriented protrusions and loss of asymmetry in the actin network. Conversely, hypoactive Rap1 causes fewer protrusions and cluster spinning during migration. A forward genetic screen revealed that downregulation of the Hippo (Hpo) pathway core components hpo or mats enhances the Rap1V12-induced migration defect and misdirected protrusions. Mechanistically, association of Rap1V12 with the kinase domain of Hpo suppresses its activity, which releases Hpo signaling-mediated suppression of F-actin elongation, promoting cellular protrusions in collective cell migration.

Citations

Aug 8, 2019·G3 : Genes - Genomes - Genetics·Michael D RotelliBrian R Calvi
Aug 30, 2018·Molecular Biology of the Cell·Ketki SawantJocelyn A McDonald
Dec 20, 2018·Annual Review of Biochemistry·Shenghong MaKun-Liang Guan
Mar 3, 2020·Frontiers in Molecular Biosciences·Yu-Chiuan ChangAnna C-C Jang
Feb 28, 2020·Cell Death & Disease·Josephine VolovetzJustin D Lathia
Aug 14, 2019·Current Opinion in Genetics & Development·Frank Macabenta, Angelike Stathopoulos
May 29, 2021·Journal of Cellular Physiology·Kyoung Moo ChoiDaniel J Tschumperlin
Jun 23, 2021·Aging·Ana-Mihaela LupanAlexandrina Burlacu

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