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Updated: Mar 24, 2026

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Novel impact of EWI-2, CD9, and CD81 on TGF-β signaling in melanoma

Hong-Xing Wang1, Martin E Hemler1

  • 1Department of Cancer Immunology and AIDS; Dana-Farber Cancer Institute and Department of Pathology; Harvard Medical School; Boston, MA USA.

Molecular & Cellular Oncology
|March 19, 2016
PubMed

Insights

EWI-2 protein regulates melanoma cell signaling by controlling transforming growth factor-beta (TGF-β) activity. This protein impacts melanoma progression from early to later stages by influencing TGF-β

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Melanoma progression involves a shift in transforming growth factor-beta (TGF-β) signaling from cytostatic to pro-metastatic.
  • Cell surface proteins play critical roles in regulating cell signaling pathways.

Purpose of the Study:

  • To investigate the role of the cell surface transmembrane protein EWI-2 in regulating melanoma TGF-β signaling.
  • To understand how EWI-2 influences the transition of melanoma from early to advanced stages.

Main Methods:

  • Investigated the function of EWI-2 in melanoma cell lines.
  • Analyzed the interaction of EWI-2 with tetraspanin proteins CD9 and CD81.
  • Assessed the impact of EWI-2 on TGF-β receptor complex formation.

Main Results:

  • EWI-2 negatively regulates melanoma TGF-β signaling.
  • EWI-2 sequesters CD9 and CD81, preventing their support of TGFβ receptor 1 and TGFβ receptor 2 association.
  • EWI-2 is positioned to control the switch in TGF-β signaling during melanoma progression.

Conclusions:

  • EWI-2 acts as a key regulator of melanoma TGF-β signaling.
  • Targeting EWI-2 may offer therapeutic strategies for controlling melanoma invasion and metastasis.
Keywords:
CD81CD9EWI-2/IGSF8TGF-β1melanomatetraspanins

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