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Krüppel-like factor 6 interferes with cellular transformation induced by the H-ras oncogene

Lucas Daniel Trucco1, Verónica Andreoli1, Nicolás Gonzalo Núñez1

  • 1Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 13, 2014
PubMed

Insights

Krüppel-like factor 6 (KLF6) acts as a tumor suppressor by controlling cell proliferation. KLF6 knockdown promotes tumorigenesis, while its expression inhibits cancer growth and transformation.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Krüppel-like factor 6 (KLF6) is a transcription factor involved in cell regulation.
  • KLF6 dysfunction is linked to human cancers.
  • Its precise role in oncogenesis requires further elucidation.

Purpose of the Study:

  • To investigate the role of KLF6 in cellular transformation and tumorigenesis.
  • To determine KLF6's interaction with oncogenic Ras signaling.
  • To explore KLF6's impact on cell cycle regulation and tumor growth.

Main Methods:

  • KLF6 knockdown in NIH3T3 cells to assess transformation.
  • Co-expression studies with oncogenic H-Ras(G12V).
  • Cell cycle analysis, proliferation assays, and tumor growth studies in mice.
  • Gene expression analysis (p21, p53) and knockdown experiments.

Main Results:

  • KLF6 knockdown induced NIH3T3 cell transformation and tumorigenicity.
  • H-Ras(G12V) up-regulated KLF6 via Jun N-terminal kinase (JNK) signaling.
  • Ectopic KLF6 expression caused G1 cell cycle arrest and reduced proliferation.
  • KLF6 expression suppressed Ras-mediated transformation, density-dependent growth, and anchorage-independent growth.
  • KLF6 expression inhibited H-Ras(G12V)-driven tumor growth in vivo.
  • KLF6 induced p21 expression, but not p53 or apoptosis; p21 knockdown reversed KLF6-mediated cell cycle arrest.

Conclusions:

  • KLF6 functions as a suppressor of malignant transformation.
  • KLF6 inhibits cell proliferation and tumorigenesis, partly through p21 induction.
  • KLF6 represents a potential therapeutic target for controlling cancer progression.
Keywords:
c-Jun N-terminal kinasep21tumor suppressor

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