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The oncogene DEK promotes leukemic cell survival and is downregulated by both Nutlin-3 and chlorambucil in B-chronic

Paola Secchiero1, Rebecca Voltan, Maria Grazia di Iasio

  • 1Department of Morphology and Embryology, University of Ferrara, Ferrara, Italy.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|March 11, 2010
PubMed
Abstract

Insights

The oncogene DEK is downregulated by Nutlin-3 and chlorambucil, impacting B-chronic lymphocytic leukemia (B-CLL) cell survival. Targeting DEK may enhance the effectiveness of these cancer therapies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • The oncogene DEK plays a role in various cancers.
  • Understanding DEK's function in B-chronic lymphocytic leukemia (B-CLL) is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of the oncogene DEK in modulating the response to Nutlin-3 and chlorambucil in B-CLL cells.
  • To explore the interplay between DEK, p53, and therapeutic responses.

Main Methods:

  • DEK mRNA and protein levels were analyzed in B-CLL samples and cell lines.
  • Gene silencing techniques (siRNA) were used to assess the impact of p53 and DEK on cell survival and apoptosis.
  • Cells were treated with Nutlin-3 (MDM2/p53 inhibitor) or chlorambucil.

Main Results:

  • Nutlin-3 and chlorambucil downregulated DEK in B-CLL cells but not in p53-mutated cells.
  • DEK knockdown significantly increased apoptosis, while p53 knockdown attenuated Nutlin-3's effect on DEK.
  • p53 siRNA reduced Nutlin-3-induced apoptosis, indicating DEK's protective role.

Conclusions:

  • DEK downregulation is a key factor in the cytotoxic response of leukemic cells to Nutlin-3 and chlorambucil.
  • Strategies targeting DEK downregulation could enhance the therapeutic efficacy of these agents in B-CLL treatment.

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