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WNT5A-RHOA Signaling Is a Driver of Tumorigenesis and Represents a Therapeutically Actionable Vulnerability in Small

Kee-Beom Kim1,2, Dong-Wook Kim1, Youngchul Kim3

  • 1Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, Virginia.

Cancer Research
|September 14, 2022
PubMed

Insights

The WNT5A-RHOA pathway is crucial for small cell lung cancer (SCLC) development and progression. Targeting this axis offers a promising therapeutic strategy for this challenging cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • WNT signaling is implicated in various cancers, but its role in small cell lung cancer (SCLC) is not fully understood.
  • Canonical WNT signaling via β-catenin is often dysregulated in cancer, but its specific role in SCLC requires further investigation.

Purpose of the Study:

  • To investigate the activity and functional role of WNT signaling in SCLC.
  • To identify key molecular players and pathways driving SCLC development and progression.

Main Methods:

  • Utilized genetically engineered mouse models to study WNT signaling in SCLC.
  • Analyzed the expression and function of WNT pathway components, including β-catenin, WNT5A, p130, and RHOA.
  • Employed gene knockout and chemical inhibition strategies to assess pathway dependency.

Main Results:

  • Canonical WNT signaling mediated by β-catenin was found to be dispensable and silenced in SCLC.
  • Noncanonical WNT signaling ligand WNT5A was essential for SCLC development and proliferation.
  • Loss of p130 induced WNT5A expression, leading to RHOA activation and driving SCLC progression.
  • Inhibition of RHOA suppressed SCLC development and proliferation in vivo and in vitro.

Conclusions:

  • The WNT5A-RHOA axis represents a novel and critical pathway in SCLC pathogenesis.
  • This pathway is a potential therapeutic target for developing new treatments for SCLC.
  • Findings highlight the heterogeneity of WNT signaling in cancer and its cell-type-specific mechanisms.

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