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Updated: Jan 25, 2026

Studying the Stoichiometry of Epidermal Growth Factor Receptor in Intact Cells using Correlative Microscopy
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GP78 Cooperates with Dual-Specificity Phosphatase 1 To Stimulate Epidermal Growth Factor Receptor-Mediated

Dhong Hyo Kho1, Mohammed Hafiz Uddin1, Madhumita Chatterjee1

  • 1Departments of Oncology and Pathology, Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, Michigan, USA.

Molecular and Cellular Biology
|May 8, 2019
PubMed

Insights

GP78 receptor activates cancer cell proliferation and invasion by promoting ERK pathway signaling. It achieves this by degrading DUSP1 and maintaining EGFR activation, revealing a novel cancer progression mechanism.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • GP78 (also known as AMFR) is an E3 ubiquitin ligase implicated in tumor progression.
  • Aberrant ERK activation is a hallmark of cancer, driving proliferation and invasion.
  • The precise mechanism linking GP78 to ERK activation remains unclear.

Purpose of the Study:

  • To elucidate the role of GP78 in epidermal growth factor receptor (EGFR)-mediated ERK activation.
  • To identify the molecular players involved in GP78-driven signaling pathways in cancer cells.

Main Methods:

  • Investigated GP78's interaction with DUSP1 and EGFR.
  • Utilized ubiquitination assays to assess DUSP1 degradation.
  • Performed EGFR phosphorylation assays in GP78-deficient cells.

Main Results:

  • GP78 interacts with and promotes the ubiquitination and degradation of DUSP1, a negative regulator of MAPKs.
  • GP78 is essential for EGFR activation, as EGF fails to induce EGFR phosphorylation in GP78-deficient cells.
  • GP78 enhances cancer cell proliferation, motility, and invasion through EGFR and ERK regulation.

Conclusions:

  • GP78 activates ERK signaling by degrading DUSP1 and sustaining EGFR activation.
  • This study uncovers a novel GP78-mediated signaling axis crucial for EGFR-dependent cancer progression.
  • Targeting GP78 may offer a therapeutic strategy for inhibiting cancer cell proliferation and invasion.
Keywords:
DUSP1EGFRERKGP78ubiquitination

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