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KLF4 suppresses transformation of pre-B cells by ABL oncogenes

Michael G Kharas1, Isharat Yusuf, Vanessa M Scarfone

  • 1Department of Molecular Biology and Biochemistry, University of California-Irvine, 3242 McGaugh Hall, Irvine, CA 92697-3900, USA.

Blood
|September 7, 2006
PubMed

Insights

Krüppel-like factor 4 (KLF4) suppresses B-cell leukemia by inducing cell cycle arrest and apoptosis. KLF4 acts as a tumor suppressor, blocking oncogene-driven transformation and depleting leukemic cells in vivo.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Hematology

Background:

  • Genes repressed during B-cell activation are implicated in B-cell malignancies.
  • Krüppel-like factor 4 (KLF4) is downregulated in activated B cells and expressed at low levels in B-cell lymphomas and leukemias.
  • KLF4 functions as a tumor suppressor in epithelial cancers, inhibiting proliferation.

Purpose of the Study:

  • To investigate the role of KLF4 in pro/pre-B-cell transformation induced by v-Abl and BCR-ABL oncogenes.
  • To determine the effects of KLF4 on cell cycle progression, apoptosis, and oncogene-driven leukemogenesis.

Main Methods:

  • Overexpression of KLF4 in pro/pre-B cells and analysis of cell cycle phase and apoptosis.
  • Assessment of KLF4's impact on key cell cycle regulators (p21CIP, c-Myc, cyclin D2).
  • Utilizing tetracycline-inducible KLF4 expression in transgenic mouse models with BCR-ABL-induced leukemia.

Main Results:

  • KLF4 overexpression induces G1 cell cycle arrest and apoptosis in transformed pro/pre-B cells.
  • KLF4-induced apoptosis is partially rescued by Bcl-XL, while cell cycle arrest is not.
  • KLF4 upregulates p21CIP and downregulates c-Myc and cyclin D2, inhibiting transformation and depleting leukemic cells in vivo.

Conclusions:

  • KLF4 functions as a tumor suppressor in B-cell malignancies.
  • KLF4 inhibits BCR-ABL-driven leukemogenesis by inducing cell cycle arrest and apoptosis.
  • KLF4 represents a potential therapeutic target for B-cell leukemias and lymphomas.

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