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Related Experiment Video

Updated: May 31, 2025

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ERBB4 selectively amplifies TGF-β pro-metastatic responses.

Peihong Luo1, Huanyu Hong1, Baoling Zhang1

  • 1MOE Key Laboratory of Biosystems Homeostasis & Protection, and Zhejiang Provincial Key Laboratory of Cancer Molecular Cell Biology, Life Sciences Institute, Zhejiang University, Hangzhou, Zhejiang 310058, China; Center for Life Sciences, Shaoxing Institute, Zhejiang University, Shaoxing, Zhejiang 321000, China; Cancer Center, Zhejiang University, Hangzhou, Zhejiang 310058, China.

Cell Reports
|January 24, 2025
PubMed
Summary

ERBB4 promotes cancer metastasis by selectively activating transforming growth factor β (TGF-β) signaling. This involves ERBB4 phosphorylating SMAD4, enhancing its DNA binding for pro-metastatic gene transcription.

Keywords:
CP: CancerEMTERBB familySMAD proteinsSMAD4/DPC4phosphorylationsignalingtumorigenesistyrosine kinases

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • Transforming growth factor β (TGF-β) exhibits dual roles in cancer, acting as both a tumor suppressor and a promoter of metastasis.
  • The precise molecular mechanisms dictating TGF-β's opposing functions in tumorigenesis are not fully understood.
  • Understanding these mechanisms is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To elucidate the specific mechanisms by which TGF-β elicits distinct responses in cancer progression.
  • To identify key molecular players involved in TGF-β-mediated pro-metastatic signaling.
  • To investigate the role of ERBB4 in modulating TGF-β's effects on tumor growth and metastasis.

Main Methods:

  • Investigated the interaction between ERBB4 and SMAD4 using biochemical assays.
  • Analyzed the phosphorylation status of SMAD4 at Tyr162.
  • Assessed the impact of ERBB4-mediated SMAD4 phosphorylation on TGF-β-induced gene expression related to epithelial-to-mesenchymal transition (EMT), cell migration, and invasion.
  • Utilized mouse models to evaluate the role of the ERBB4-SMAD4 axis in lung cancer metastasis.

Main Results:

  • ERBB4 selectively promotes the pro-metastatic effects of TGF-β, independent of its growth-inhibitory functions.
  • ERBB4 directly phosphorylates SMAD4 at Tyr162, enhancing its DNA-binding capacity.
  • This phosphorylation potentiates TGF-β-induced transcription of genes driving EMT, migration, and invasion, facilitating lung cancer metastasis in vivo.

Conclusions:

  • ERBB4 acts as a specific mediator of TGF-β's pro-metastatic signaling pathway.
  • The ERBB4-SMAD4 interaction represents a novel regulatory axis controlling tumor metastasis.
  • Targeting the ERBB4-SMAD4 pathway may offer a therapeutic strategy to inhibit cancer spread.