The small GTPase RhoG mediates glioblastoma cell invasion

Aneta Kwiatkowska, Sebastien Didier, Shannon Fortin, Yayu Chuang, Timothy White, Michael E. Berens, Elisabeth Rushing, Jennifer Eschbacher, Nhan Tran, Amanda Chan, Marc Symons

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Background: The invasion of glioblastoma cells into regions of the normal brain is a critical factor that limits current therapies for malignant astrocytomas. Previous work has identified roles for the Rho family guanine nucleotide exchange factors Trio and Vav3 in glioblastoma invasion. Both Trio and Vav3 act on the small GTPase RhoG. We therefore examined the role of RhoG in the invasive behavior of glioblastoma cells.Results: We found that siRNA-mediated depletion of RhoG strongly inhibits invasion of glioblastoma cells through brain slices ex vivo. In addition, depletion of RhoG has a marginal effect on glioblastoma cell proliferation, but significantly inhibits glioblastoma cell survival in colony formation assays. We also observed that RhoG is activated by both HGF and EGF, two factors that are thought to be clinically relevant drivers of glioblastoma invasive behavior, and that RhoG is overexpressed in human glioblastoma tumors versus non-neoplastic brain. In search of a mechanism for the contribution of RhoG to the malignant behavior of glioblastoma cells, we found that depletion of RhoG strongly inhibits activation of the Rac1 GTPase by both HGF and EGF. In line with this observation, we also show that RhoG contributes to the formation of lamellipodia and invadopodia, two functions that have been shown to be Rac1-dependent.Conclusions: Our functional analysis of RhoG in the context of glioblastoma revealed a critical role for RhoG in tumor cell invasion and survival. These results suggest that targeting RhoG-mediated signaling presents a novel avenue for glioblastoma therapy.

Original languageEnglish (US)
Article number65
JournalMolecular Cancer
Volume11
DOIs
StatePublished - Sep 11 2012
Externally publishedYes

Fingerprint

Monomeric GTP-Binding Proteins
Glioblastoma
Epidermal Growth Factor
Cell Survival
Brain
Rho Guanine Nucleotide Exchange Factors
Pseudopodia
GTP Phosphohydrolases
Astrocytoma
Small Interfering RNA
Neoplasms
Cell Proliferation

Keywords

  • cMet
  • EGFR
  • Glioblastoma
  • Invasion
  • Rac1
  • RhoG

ASJC Scopus subject areas

  • Cancer Research
  • Molecular Medicine
  • Oncology

Cite this

Kwiatkowska, A., Didier, S., Fortin, S., Chuang, Y., White, T., Berens, M. E., ... Symons, M. (2012). The small GTPase RhoG mediates glioblastoma cell invasion. Molecular Cancer, 11, [65]. https://doi.org/10.1186/1476-4598-11-65

The small GTPase RhoG mediates glioblastoma cell invasion. / Kwiatkowska, Aneta; Didier, Sebastien; Fortin, Shannon; Chuang, Yayu; White, Timothy; Berens, Michael E.; Rushing, Elisabeth; Eschbacher, Jennifer; Tran, Nhan; Chan, Amanda; Symons, Marc.

In: Molecular Cancer, Vol. 11, 65, 11.09.2012.

Research output: Contribution to journalArticle

Kwiatkowska, A, Didier, S, Fortin, S, Chuang, Y, White, T, Berens, ME, Rushing, E, Eschbacher, J, Tran, N, Chan, A & Symons, M 2012, 'The small GTPase RhoG mediates glioblastoma cell invasion', Molecular Cancer, vol. 11, 65. https://doi.org/10.1186/1476-4598-11-65
Kwiatkowska A, Didier S, Fortin S, Chuang Y, White T, Berens ME et al. The small GTPase RhoG mediates glioblastoma cell invasion. Molecular Cancer. 2012 Sep 11;11. 65. https://doi.org/10.1186/1476-4598-11-65
Kwiatkowska, Aneta ; Didier, Sebastien ; Fortin, Shannon ; Chuang, Yayu ; White, Timothy ; Berens, Michael E. ; Rushing, Elisabeth ; Eschbacher, Jennifer ; Tran, Nhan ; Chan, Amanda ; Symons, Marc. / The small GTPase RhoG mediates glioblastoma cell invasion. In: Molecular Cancer. 2012 ; Vol. 11.
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