Rho GTPase Signaling in Cancer Cell Dynamics

Rho GTPases constitute a family of molecular switches that orchestrate the remodelling of the actin cytoskeleton, thereby directing cell shape, adhesion, migration and invasion. In their active GTP-bound state, members such as RhoA, Rac1 and Cdc42 engage distinct effector pathways to generate contractile fibres, lamellipodia and filopodia, which underlie the plasticity of cancer cell movement. This dynamic control of cytoskeletal architecture is integrated with signalling cascades from growth factor receptors and adhesion molecules, permitting tumour cells to sense and adapt to the extracellular matrix. Aberrant regulation of nucleotide exchange factors and GTPase-activating proteins leads to sustained GTPase activation, promoting epithelial-mesenchymal transition, enhanced motility and metastatic dissemination. The global significance of Rho GTPase signalling is underscored by its impact on therapeutic resistance and the emergence of targeted inhibitors aimed at interrupting key nodes of this network.

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Technical terms

Rho GTPase: A small G-protein that alternates between inactive (GDP-bound) and active (GTP-bound) states to regulate cytoskeletal organisation and cell motility.

Epithelial-mesenchymal transition (EMT): A biological programme in which epithelial cells lose polarity and adhesion to acquire migratory, mesenchymal characteristics.

Guanine nucleotide exchange factor (GEF): A protein that catalyses the release of GDP from a GTPase, facilitating binding of GTP and activation of the GTPase.

GTPase-activating protein (GAP): A protein that accelerates the intrinsic GTP hydrolysis of a GTPase, returning it to the inactive GDP-bound form.

Actin cytoskeleton: A dynamic network of filamentous actin that provides structural support and drives cell shape changes and motility.

References

1. Tight junction protein cingulin variant is associated with cancer susceptibility by overexpressed IQGAP1 and Rac1-dependent epithelial-mesenchymal transition. Journal of Experimental & Clinical Cancer Research (2024).
2. Downregulation of the Rho GTPase pathway abrogates resistance to ionizing radiation in wild-type p53 glioblastoma by suppressing DNA repair mechanisms. Cell Death & Disease (2023).
3. A TIAM1-TRIM28 complex mediates epigenetic silencing of protocadherins to promote migration of lung cancer cells. Proceedings of the National Academy of Sciences of the United States of America (2023).
4. Deregulation of Rho GTPases in cancer. Small GTPases (2016).
5. Rac and Rho GTPases in cancer cell motility control. Cell Communication and Signaling (2010).
6. Rac1 in human diseases: The therapeutic potential of targeting Rac1 signaling regulatory mechanisms. Small GTPases (2016).