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Drug-resistant breast carcinoma (MCF-7) cells are paradoxically sensitive to apoptosis

Jack S K Chen1, Marina Konopleva, Michael Andreeff

  • 1Department of Bioimmunotherapy, The University of Texas, M.D. Anderson Cancer Center, Houston, Texas 77030, USA.

Journal of Cellular Physiology
|June 3, 2004
PubMed

Insights

Drug-resistant breast cancer cells (MCF-7/DOX) show high sensitivity to apoptosis. Calcium ionophore A23187 induces apoptosis via a novel pathway, bypassing typical upstream caspase-3 activation events.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Multidrug resistance (MDR) in cancer is a significant clinical challenge.
  • MCF-7/DOX cells exhibit high resistance (>150-fold) to doxorubicin.
  • Understanding apoptosis pathways in resistant cells is crucial for targeted therapies.

Purpose of the Study:

  • To investigate the susceptibility of drug-resistant MCF-7/DOX cells to apoptotic stimuli.
  • To determine the role of tissue transglutaminase (TG2) and caspase-3 in apoptosis induction.
  • To elucidate the upstream pathways involved in apoptosis triggered by A23187 and staurosporine (STS).

Main Methods:

  • Treatment of MCF-7/DOX cells with calcium ionophore A23187 and staurosporine (STS).
  • Assessment of apoptosis induction, caspase-3 activation, and upstream apoptotic events.
  • Analysis of mitochondrial membrane potential (ΔΨ), cytochrome c release, and caspase-8/9 activation.

Main Results:

  • MCF-7/DOX cells are highly sensitive to apoptotic stimuli like A23187 and STS.
  • Both A23187 and STS induce apoptosis accompanied by caspase-3 activation.
  • STS triggers canonical upstream apoptotic events, while A23187 bypasses them, suggesting a novel pathway.

Conclusions:

  • MCF-7/DOX cells are unexpectedly sensitive to apoptosis.
  • A23187-induced apoptosis in these cells involves a novel, uncharacterized upstream pathway leading to caspase-3 activation.
  • These findings offer new insights into apoptosis regulation in drug-resistant breast cancer.

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