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Cell Death Associated with Abnormal Mitosis Observed by Confocal Imaging in Live Cancer Cells
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Published on: August 21, 2013

The BH3 mimetic ABT-737 induces cancer cell senescence

Jin H Song1, Karthikeyan Kandasamy, Marina Zemskova

  • 1Department of Biochemistry and Molecular Biology, The Hollings Cancer Center, The Medical University of South Carolina, Charleston, South Carolina 29425, USA. songjin@musc.edu

Cancer Research
|November 19, 2010
PubMed

Insights

The Bcl-2 antagonist ABT-737 can induce cellular senescence in apoptosis-resistant cancer cells, not cell death. This senescence involves inflammatory gene changes and is p53-dependent, suggesting new therapeutic potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • ABT-737 is a Bcl-2 antagonist that induces apoptosis in many cancer types.
  • Solid tumor cell lines often resist apoptosis when treated with ABT-737.
  • A novel mechanism of ABT-737 action in resistant cells is investigated.

Purpose of the Study:

  • To investigate the biological effects of ABT-737 on apoptosis-resistant cancer cells.
  • To identify the molecular mechanisms underlying ABT-737's action in these cells.
  • To explore the potential of ABT-737 beyond direct apoptosis induction.

Main Methods:

  • Gene transcription analysis in PV-10 renal cell carcinoma cells treated with ABT-737.
  • Assessment of senescence markers (e.g., β-galactosidase) in various cancer cell lines.
  • Investigation of reactive oxygen species, caspase activation, and DNA damage.
  • Functional studies using dominant-negative p53 to confirm p53 dependency.

Main Results:

  • ABT-737 treatment altered transcription of nearly 430 genes in PV-10 cells, many related to inflammation (e.g., IL-6, IL-8, IL-11, CXCL2, CXCL5).
  • Apoptosis-resistant renal, lung, and prostate cancer cells exhibited induced senescence-associated β-galactosidase and growth inhibition after ABT-737 exposure.
  • Senescence induction was linked to reactive oxygen species, low-level caspase activation, minor DNA damage, and increased p53 and p21.
  • ABT-737-induced senescence was confirmed to be p53-dependent.

Conclusions:

  • ABT-737 can induce cellular senescence in apoptosis-resistant cancer cells, characterized by inflammatory gene expression.
  • This senescence pathway is mediated by reactive oxygen species and p53 activation.
  • ABT-737 exhibits potential anticancer activity through mechanisms beyond direct apoptosis induction, particularly in resistant cancers.

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