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Functional significance of Wnt inhibitory factor-1 gene in kidney cancer

Kazumori Kawakami1, Hiroshi Hirata, Soichiro Yamamura

  • 1Department of Urology, Veterans Affairs Medical Center and University of California at San Francisco, San Francisco, California 94121, USA.

Cancer Research
|November 6, 2009
PubMed

Insights

Wnt inhibitory factor-1 (WIF-1) is downregulated in kidney cancer due to promoter methylation. Restoring WIF-1 suppresses tumor growth and induces apoptosis, indicating its tumor suppressor role in renal cell carcinoma (RCC).

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Wnt inhibitory factor-1 (WIF-1) is a secreted antagonist of Wnt signaling.
  • WIF-1 has demonstrated tumor suppressor activity in various cancers.
  • The role of WIF-1 in human renal cell carcinoma (RCC) remains unexplored.

Purpose of the Study:

  • To investigate the molecular function of the WIF-1 gene in human RCC.
  • To determine if WIF-1 acts as a tumor suppressor in RCC by inducing apoptosis and inhibiting tumor growth.

Main Methods:

  • Immunohistochemistry and real-time RT-PCR to assess WIF-1 expression in RCC tissues and cell lines.
  • Bisulfite sequencing to analyze WIF-1 promoter methylation status.
  • WIF-1 gene transfection in RCC cells to evaluate effects on cell growth, apoptosis, and Wnt signaling.

Main Results:

  • WIF-1 expression was significantly downregulated in RCC samples and cell lines.
  • Promoter methylation was identified as a key mechanism for WIF-1 downregulation in RCC.
  • WIF-1 transfection inhibited RCC cell proliferation, colony formation, induced apoptosis, and suppressed tumor growth in vivo.
  • WIF-1 transfection reduced Wnt signaling activity and beta-catenin expression.

Conclusions:

  • WIF-1 is epigenetically silenced by promoter methylation in human RCC.
  • WIF-1 functions as a tumor suppressor in RCC by inhibiting cell proliferation and inducing apoptosis.
  • This study establishes WIF-1 as a potential therapeutic target for renal cell carcinoma.

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