Related Experiment Video

Updated: Nov 8, 2025

In vitro Organoid Culture of Primary Mouse Colon Tumors
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In vitro Organoid Culture of Primary Mouse Colon Tumors

Published on: May 17, 2013

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RAC1B modulates intestinal tumourigenesis via modulation of WNT and EGFR signalling pathways

Victoria Gudiño1,2, Sebastian Öther-Gee Pohl1, Caroline V Billard1

  • 1Cancer Research UK Edinburgh Centre, MRC Institute of Genetics & Molecular Medicine, The University of Edinburgh, Western General Hospital, Edinburgh, EH4 2XU, UK.

Nature Communications
|April 21, 2021
PubMed

Insights

RAC1B promotes colorectal cancer growth and resistance to EGFR inhibitors. Inhibiting RAC1B may improve treatment efficacy for patients with colorectal cancer, enhancing outcomes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Colorectal cancer (CRC) treatments often lack efficacy and develop resistance.
  • Understanding resistance mechanisms is crucial for developing improved therapies.

Purpose of the Study:

  • Identify novel therapeutic targets to overcome CRC treatment resistance.
  • Investigate the role of RAC1B in colorectal tumorigenesis and EGFR inhibitor resistance.

Main Methods:

  • Analyzed RAC1B expression in human CRC tissues.
  • Utilized a mouse model of colorectal cancer with Rac1b deletion.
  • Examined RAC1B's interaction with the EGFR signaling pathway.
  • Assessed RAC1B inhibition in cetuximab-resistant CRC organoids.

Main Results:

  • High RAC1B expression correlates with aggressive CRC and poor prognosis.
  • Rac1b deletion in mice reduced colorectal tumor development.
  • RAC1B is essential for efficient EGFR pathway activation.
  • Inhibiting RAC1B resensitized resistant CRC organoids to EGFR inhibitors.

Conclusions:

  • RAC1B is a key mediator of colorectal tumorigenesis and therapy resistance.
  • Targeting RAC1B presents a promising strategy to enhance EGFR inhibitor efficacy in CRC.

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