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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis
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A Robust Discovery Platform for the Identification of Novel Mediators of Melanoma Metastasis

Published on: March 8, 2022

Sox4-mediated Dicer expression is critical for suppression of melanoma cell invasion

S M Jafarnejad1, G S Ardekani, M Ghaffari

  • 1Department of Dermatology and Skin Science, Jack Bell Research Centre, University of British Columbia, Vancouver, British Columbia, Canada.

Oncogene
|June 13, 2012
PubMed

Insights

Sox4 protein regulates Dicer expression in melanoma, a key factor in suppressing tumor invasion. Reduced Dicer levels correlate with advanced melanoma and poorer patient survival, highlighting a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Sox4 is downregulated in metastatic melanoma, inhibiting cell migration and invasion via NF-κB p50.
  • Sox4 interacts with the promoter of Dicer, a microRNA (miRNA) biogenesis factor, whose expression is altered in cancers.
  • Mechanisms regulating Dicer in melanoma and its role in progression remain largely unknown.

Purpose of the Study:

  • To investigate the regulation of Dicer expression by Sox4 in melanoma.
  • To elucidate the role of Dicer in suppressing melanoma invasion.
  • To assess the clinical significance of Dicer and Sox4 expression in melanoma progression and patient survival.

Main Methods:

  • Investigated Sox4's effect on Dicer promoter activity and expression.
  • Utilized Dicer knockdown and overexpression in melanoma cell lines to assess invasion.
  • Analyzed Dicer and Sox4 protein expression in 514 melanocytic lesions via tissue microarray.
  • Correlated Dicer and Sox4 expression with melanoma stage and patient survival data.

Main Results:

  • Sox4 positively regulates Dicer expression by binding to its promoter.
  • Dicer knockdown significantly enhanced melanoma cell invasion (≥2-fold).
  • Overexpression of Dicer reversed invasion enhancement caused by Sox4 knockdown.
  • Dicer expression inversely correlated with melanoma progression (P<0.0001) and patient survival (P=0.015/0.0029).
  • Sox4 and Dicer protein expression were significantly correlated in melanoma biopsies (P=0.009).
  • Sox4 knockdown altered miRNA expression patterns, primarily due to reduced Dicer.

Conclusions:

  • Sox4 positively regulates Dicer expression in melanoma, which is critical for suppressing tumor invasion.
  • Dicer acts as a tumor suppressor in melanoma by regulating miRNA biogenesis.
  • The Sox4-Dicer-miRNA axis represents a potential therapeutic target for melanoma treatment.

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