Rac activation and inactivation control plasticity of tumor cell movement

Victoria Sanz-Moreno ¹, Gilles Gadea , Jessica Ahn

⁰Institute of Cancer Research, Cancer Research UK Centre for Cell and Molecular Biology, 237 Fulham Road, London SW3 6JB, UK.

Cell +

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November 6, 2008

View abstract on PubMed

Summary

Tumor cells switch between mesenchymal and amoeboid movement by regulating Rho and Rac signaling pathways. This study identifies key molecular players controlling these critical cell migration modes.

Area Of Science

Cell Biology
Cancer Research
Molecular Biology

Background

Tumor cells exhibit distinct modes of migration: mesenchymal and amoeboid.
Mesenchymal movement involves elongated cells, proteolysis, and Rac signaling.
Amoeboid movement features rounded cells, Rho-kinase signaling, and high actomyosin contractility.

Purpose Of The Study

To elucidate the molecular mechanisms governing the interconversion between mesenchymal and amoeboid tumor cell movement.
To identify key signaling pathways and proteins that regulate these distinct cell migration modes.

Main Methods

Investigated the roles of GTPases Rac and Rho-kinase signaling in regulating cell morphology and movement.
Utilized molecular complexes involving NEDD9, DOCK3, WAVE2, and ARHGAP22 to study Rac and Rho activity.
Analyzed the interplay between Rho and Rac signaling pathways in controlling tumor cell migration.

Main Results

Mesenchymal movement is driven by Rac activation via the NEDD9-DOCK3 complex, which signals through WAVE2.
Rac activation suppresses actomyosin contractility, inhibiting amoeboid movement.
Rho-kinase signaling activates ARHGAP22, a Rac GAP, which suppresses mesenchymal movement by inactivating Rac.

Conclusions

Tumor cell migration modes are determined by a dynamic interplay between Rho and Rac signaling.
Understanding these switching mechanisms provides insights into melanoma metastasis and potential therapeutic targets.

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