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CMTM3 decreases EGFR expression and EGF-mediated tumorigenicity by promoting Rab5 activity in gastric cancer

Wanqiong Yuan1, Baocai Liu1, Xiaolin Wang1

  • 1Peking University Center for Human Disease Genomics, Department of Immunology, Key Laboratory of Medical Immunology, Ministry of Health, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Beijing, 100191, China.

Cancer Letters
|November 22, 2016
PubMed

Insights

CKLF-like MARVEL transmembrane domain containing 3 (CMTM3) inhibits gastric cancer metastasis by reducing epidermal growth factor receptor (EGFR) expression and enhancing its degradation through Rab5 activation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • CKLF-like MARVEL transmembrane domain containing 3 (CMTM3) is a tumor suppressor gene implicated in various cancers.
  • CMTM3 knockdown correlates with increased gastric cancer metastasis via the STAT3/Twist1/EMT pathway.
  • Elevated epidermal growth factor receptor (EGFR) expression is linked to gastric cancer progression and poor patient outcomes.

Purpose of the Study:

  • To investigate the role of CMTM3 in regulating EGFR expression and cell migration in gastric cancer.
  • To elucidate the molecular mechanism by which CMTM3 influences EGFR degradation and downstream signaling.

Main Methods:

  • Cellular and molecular biology techniques were employed, including gene knockdown, co-immunoprecipitation, and immunofluorescence.
  • Assays focused on EGFR expression, cell migration, STAT3 signaling, and protein-protein interactions.
  • The involvement of early endosome markers Rab5 and EEA1 was examined.

Main Results:

  • CMTM3 was found to suppress EGF-mediated migration and STAT3 signaling in gastric cancer cells.
  • CMTM3 downregulates EGFR expression by promoting its degradation, with CMTM3 colocalizing with Rab5 and EEA1.
  • CMTM3 enhances Rab5 activity, and Rab5 inhibition abrogates CMTM3's suppressive effects on EGFR and migration.

Conclusions:

  • CMTM3 acts as a tumor suppressor in gastric cancer by decreasing EGFR expression and inhibiting EGF-mediated cell migration.
  • The mechanism involves CMTM3-enhanced Rab5 activity, leading to accelerated EGFR degradation.
  • The C-terminal region of CMTM3 is crucial for its tumor-suppressive functions, highlighting potential therapeutic targets.
Keywords:
CMTM3EGFRGastric cancerMigrationRab5

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