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Updated: Feb 3, 2026
16:40
T-wave Ion Mobility-mass Spectrometry: Basic Experimental Procedures for Protein Complex Analysis
Published on: July 31, 2010
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RalB directly triggers invasion downstream Ras by mobilizing the Wave complex
Giulia Zago1,2, Irina Veith1,2, Manish Kumar Singh1,2
1Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University, Paris, France.
Elife
|October 16, 2018
Summary
Researchers identified a novel pathway involving RalB that drives cancer invasion and metastasis. This discovery highlights the Ras-RGL1/2-RalB-exocyst-Wave Regulatory Complex axis as a potential target for new cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Ral GTPases (RalA and RalB) are critical downstream effectors of Ras oncoproteins in human cancers.
- RalB specifically contributes to cancer invasion and metastasis, yet targeted therapies are lacking.
Purpose of the Study:
- To elucidate the signaling pathways through which Ras promotes cancer invasion and metastasis.
- To identify novel therapeutic targets for Ral-mediated cancer progression.
Main Methods:
- Utilized a novel optogenetic approach for light-controlled activation of Ral at the plasma membrane.
- Investigated the recruitment of the Wave Regulatory Complex (WRC) via the exocyst effector.
- Analyzed RalB protein expression in human breast cancer tissues.
Main Results:
- Light-induced Ral activation promotes WRC recruitment, leading to cellular protrusions and invasion.
- Active Ras signals to RalB through RalGEFs (RGL1 and RGL2) to enhance invasiveness.
- RalB's role in invasiveness is more significant than MAPK and PI3K pathways.
- Increased RalB protein expression correlates with metastatic progression in breast cancer.
Conclusions:
- The Ras-RGL1/2-RalB-exocyst-WRC signaling axis is a key driver of cancer invasion and metastasis.
- RalB represents a promising therapeutic target for developing novel anticancer strategies.
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