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Silibinin-induced apoptosis in MCF7 and T47D human breast carcinoma cells involves caspase-8 activation and

Prabha Tiwari1, Amit Kumar, S Balakrishnan

  • 1Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

Cancer Investigation
|December 21, 2010
PubMed

Insights

Silibinin, a natural flavonoid, shows potential as a breast cancer treatment. It effectively targets T47D cells more than MCF7 cells by activating apoptosis pathways.

Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Silibinin is a natural flavonoid derived from milk thistle.
  • It is currently undergoing clinical trials for prostate cancer treatment.
  • Its potential as a chemotherapeutic agent in breast cancer warrants investigation.

Purpose of the Study:

  • To evaluate the chemotherapeutic potential of silibinin in human breast cancer cell lines MCF7 and T47D.
  • To compare the sensitivity of MCF7 and T47D cells to silibinin treatment.
  • To elucidate the mechanisms underlying silibinin-induced apoptosis in breast cancer cells.

Main Methods:

  • Cell proliferation assays
  • Clonogenic assays
  • Apoptosis assays
  • Use of pan-caspase inhibitor and p53 inhibitor

Main Results:

  • T47D cells exhibited higher sensitivity to silibinin compared to MCF7 cells.
  • Silibinin-induced apoptosis was abrogated by a pan-caspase inhibitor, indicating caspase-dependent cell death.
  • p53 inhibitor did not affect silibinin's efficacy, suggesting p53-independent apoptosis.
  • Apoptotic events varied temporally and in magnitude between cell types.
  • The mitochondrial and caspase-8 activation pathways were involved in silibinin-induced apoptosis.

Conclusions:

  • Silibinin demonstrates differential sensitivity in breast cancer cell lines, with T47D being more responsive.
  • The mechanism of action involves caspase-dependent apoptosis, potentially through mitochondrial and caspase-8 pathways.
  • These findings support further research into silibinin as a targeted therapy for breast tumors.

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