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RhoC GTPase Activation Assay
09:58

RhoC GTPase Activation Assay

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BRAF and RAS oncogenes regulate Rho GTPase pathways to mediate migration and invasion properties in human colon

Eleni Makrodouli1, Eftychia Oikonomou, Michal Koc

  • 1Laboratory of Signal Mediated Gene Expression, Institute of Biological Research and Biotechnology, National Hellenic Research Foundation, Vas, Constantinou Ave. 48, 11635, Athens, Greece.

Molecular Cancer
|September 28, 2011
PubMed
Abstract

Insights

This study reveals distinct cell migration and invasion pathways driven by BRAFV600E, KRASG12V, and HRASG12V oncogenes in colorectal cancer. Understanding these pathways offers new targets for cancer therapeutics.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Colorectal cancer involves genetic alterations, including oncogene activation.
  • RAS and BRAF mutations are common but rarely found together.
  • Rho GTPases (RhoA, Rac1, Cdc42) play critical roles in cancer cell invasion and metastasis.

Purpose of the Study:

  • To differentiate the cell migration and invasion pathways utilized by BRAFV600E, KRASG12V, and HRASG12V oncogenes.
  • To investigate the specific roles of RhoA, Rac1, and Cdc42 in oncogene-driven cancer progression.

Main Methods:

  • Utilized colon adenocarcinoma cells with endogenous and ectopic oncogenic mutations (BRAFV600E, KRASG12V, HRASG12V).
  • Employed kinase inhibitors and siRNAs to modulate signaling pathways and Rho GTPases.
  • Correlated cell motility and invasion with cytoskeletal properties and Rho GTPase activities.

Main Results:

  • BRAFV600E significantly enhanced cell migration and invasion via RhoA activation, mediated by the MEK-ERK pathway.
  • KRASG12V promoted migration and invasion through filopodia and PI3K-dependent Cdc42 activation.
  • HRASG12V induced increased cell migration, invasion, and Epithelial-Mesenchymal Transition (EMT) via Rac1.
  • BRAF and KRAS oncogenes were found to cooperate with the TGFβ-1 pathway.

Conclusions:

  • This study differentiates oncogene-specific cell migration and invasion pathways mediated by Rho GTPases in colon cancer.
  • Identified potential new oncogene-specific therapeutic targets for colorectal cancer treatment.

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