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CD44 mediates constitutive type I receptor signaling in cervical carcinoma cells

M Wobus1, R Kuns, C Wolf

  • 1Department of Cell Biology, Neurobiology, & Anatomy, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA.

Gynecologic Oncology
|October 19, 2001
PubMed
Abstract

Insights

CD44 protein interacts with erbB2 and EGFR in cervical cancer cells, influencing tumor growth and metastasis. Reducing CD44 inhibited erbB2 activity, suggesting a new therapeutic target for cervical carcinoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • The CD44 protein family is involved in cancer growth and metastasis.
  • CD44 may interact with type I receptor tyrosine kinases like erbB2.

Purpose of the Study:

  • To investigate CD44 interactions with erbB2 and EGFR in cervical cancer.
  • To determine if these interactions affect erbB2 signaling.

Main Methods:

  • Immunohistochemistry and confocal microscopy to assess protein colocalization in cervical cancer tissues and cell lines.
  • Immunoprecipitation and antisense oligonucleotides to study CD44-EGFR-erbB2 interactions and their effect on erbB2 signaling.

Main Results:

  • CD44, erbB2, and EGFR were coexpressed and colocalized in 42% of cervical cancer cases and cell lines.
  • CD44 coimmunoprecipitated with erbB2 and EGFR, confirming their interaction.
  • Reduced CD44 expression inhibited erbB2 activity, and high CD44 expression correlated with EGFR activity.

Conclusions:

  • CD44 mediates type I receptor function in cervical cancer cells overexpressing CD44, erbB2, or EGFR.
  • These interactions suggest a novel mechanism contributing to cervical carcinoma growth and metastasis.

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