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Wnt4 inhibits cell motility induced by oncogenic Ras

M De Menna1, V D'Amato, A Ferraro

  • 1Dipartimento di Biologia e Patologia Cellulare e Molecolare, Università degli Studi di Napoli Federico II, Naples, Italy.

Oncogene
|October 3, 2012
PubMed

Insights

Ras oncogene signaling represses Wnt4, a key protein that inhibits cancer cell motility. This Ras-induced downregulation of Wnt4, mediated by microRNA-24, promotes cancer invasion and metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Aberrant cancer cell motility and invasiveness are critical for tumor progression and metastasis.
  • The molecular pathways governing cancer cell movement are not fully understood.

Purpose of the Study:

  • To investigate the role of Wnt4 in Ras-induced malignant transformation and cell motility.
  • To elucidate the regulatory mechanisms controlling Wnt4 expression in cancer.

Main Methods:

  • Utilized a Ras-induced malignant transformation model.
  • Analyzed Wnt4 expression in human anaplastic thyroid carcinomas.
  • Investigated the effects of Wnt4 on actin cytoskeleton reorganization and Rho-GTPase activity.
  • Identified microRNA-24 (miR-24) as a repressor of Wnt4.

Main Results:

  • Ras oncogenic signaling represses Wnt4 expression.
  • Forced Wnt4 expression inhibited Ras-induced cancer cell motility.
  • Wnt4 downregulation was observed in anaplastic thyroid carcinomas.
  • Wnt4 modulated actin cytoskeleton organization via non-canonical pathways, affecting Rho-GTPase activation.
  • miR-24 was identified as a Ras-induced microRNA targeting Wnt4's 3'-untranslated region, leading to its post-transcriptional repression.

Conclusions:

  • Ras-regulated microRNA-24 circuitry controls Wnt4 expression, impacting cancer cell motility.
  • Wnt4 acts as a tumor suppressor by inhibiting Ras-driven cell invasion and metastasis.
  • This study reveals a novel mechanism regulating cancer cell invasiveness.

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