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Epigenetic alterations of Krüppel-like factor 4 and its tumor suppressor function in renal cell carcinoma

Heng Li1, Ji Wang, Wei Xiao

  • 1Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

Carcinogenesis
|June 1, 2013
PubMed

Insights

Krüppel-like factor 4 (KLF4) is epigenetically silenced in renal cell cancers, acting as a tumor suppressor. Its reduced expression correlates with poor prognosis, suggesting KLF4 has prognostic value.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Krüppel-like factor 4 (KLF4) has varied roles in malignancies.
  • The expression and function of KLF4 in renal cell carcinoma (RCC) are not well understood.

Purpose of the Study:

  • To investigate epigenetic alterations of KLF4 in RCC.
  • To determine the role of KLF4 in renal cell carcinoma progression.

Main Methods:

  • KLF4 expression analyzed via protein and mRNA in tumor vs. normal tissues.
  • Epigenetic alterations assessed using methylation-specific PCR and Sequenom MassARRAY.
  • Functional studies involved KLF4 overexpression in cell lines and in vivo models.

Main Results:

  • KLF4 expression was significantly decreased in various RCC types and linked to poorer patient survival.
  • Hypermethylation of the KLF4 promoter was identified as a key mechanism for its suppression.
  • Overexpression of KLF4 inhibited renal cancer cell growth, migration, invasion, tumorigenicity, and metastasis in vitro and in vivo.

Conclusions:

  • KLF4 functions as a tumor suppressor gene in renal cell carcinoma.
  • Epigenetic silencing via promoter CpG methylation contributes to KLF4 downregulation in RCC.
  • KLF4 holds prognostic significance for renal cell carcinoma progression.

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