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Updated: Aug 23, 2025

Comparing the Affinity of GTPase-binding Proteins using Competition Assays
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RAB4A GTPase regulates epithelial-to-mesenchymal transition by modulating RAC1 activation

Subbulakshmi Karthikeyan1, Patrick J Casey1,2, Mei Wang3,4

  • 1Program in Cancer Stem Cell Biology, Duke-NUS Medical School, 8 College Road, Singapore, 169857, Singapore.

Breast Cancer Research : BCR
|October 29, 2022
PubMed

Insights

Researchers found that RAB4A protein is essential for epithelial-to-mesenchymal transition (EMT), a process driving cancer growth and spread. Targeting RAB4A may offer new therapies for advanced cancers.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Epithelial-to-mesenchymal transition (EMT) is crucial for cancer progression, recurrence, and drug resistance.
  • Identifying novel EMT regulators is key to developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of RAB4A in regulating EMT and cancer progression.
  • To elucidate the downstream signaling pathways involved in RAB4A-mediated EMT.

Main Methods:

  • Utilized in vitro and in vivo models to study RAB4A function.
  • Assessed cancer cell stemness, self-renewal, and tumor formation.
  • Investigated the involvement of RAC1 GTPase activation.

Main Results:

  • RAB4A is essential for EMT, stemness, and invasive properties in cancer cells.
  • Suppression of RAB4A inhibited self-renewal and tumor formation.
  • RAB4A regulates EMT via control of RAC1 GTPase activation, which can rescue EMT phenotypes when introduced.

Conclusions:

  • A RAB4A-RAC1 signaling axis is identified as a key regulator of EMT and cancer progression.
  • This pathway represents a potential therapeutic target for controlling cancer spread and improving treatment outcomes.
Keywords:
Cancer cell self-renewalCell invasionEpithelial–mesenchymal transition (EMT)MetastasisRAB4ARAC1Stemness

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