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Notch2 activation is protective against anticancer effects of zerumbone in human breast cancer cells

Anuradha Sehrawat1, Kozue Sakao, Shivendra V Singh

  • 1Department of Pharmacology and Chemical Biology, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, 5117 Centre Avenue, Pittsburgh, PA, USA.

Breast Cancer Research and Treatment
|July 21, 2014
PubMed

Insights

Zerumbone (ZER) activates Notch2, inhibiting its anticancer effects in breast cancer cells. This suggests Notch2 signaling plays a key role in ZER

Area of Science:

  • Oncology
  • Molecular Biology
  • Natural Products Chemistry

Background:

  • Zerumbone (ZER), a sesquiterpene from ginger, previously demonstrated anticancer properties by inhibiting breast cancer cell growth and inducing apoptosis.
  • The role of Notch receptors in ZER's anticancer mechanisms, specifically cell migration and apoptosis, remains to be fully elucidated.

Purpose of the Study:

  • To investigate the involvement of Notch receptors in the anticancer effects of zerumbone (ZER) on human breast cancer cells.
  • To determine how ZER influences Notch receptor cleavage, activation, and downstream signaling pathways.
  • To assess the impact of modulating Notch2 and Presenilin-1 on ZER's anti-migratory and pro-apoptotic activities.

Main Methods:

  • Western blotting to analyze protein expression levels of Notch receptors and related proteins.
  • Luciferase reporter assays to evaluate the transcriptional activity of Notch signaling.
  • RNA interference (siRNA/shRNA) to knockdown Notch2 and Presenilin-1 expression.
  • Boyden chamber assays and flow cytometry to quantify cell migration and apoptosis, respectively.

Main Results:

  • ZER exposure increased the cleavage of Notch2 while decreasing cleaved Notch1 and Notch4 in breast cancer cell lines (MDA-MB-231, MCF-7, SUM159).
  • Notch2 cleavage by ZER correlated with increased Presenilin-1 protein and Notch transcriptional activation.
  • Knockdown of Notch2 enhanced ZER's inhibition of cell migration and apoptosis induction.
  • Interference with Presenilin-1 attenuated ZER-mediated Notch2 cleavage and amplified ZER-induced apoptosis.

Conclusions:

  • ZER activates Notch2 signaling, which paradoxically dampens its own pro-apoptotic and anti-migratory effects in breast cancer cells.
  • Notch2 and Presenilin-1 are critical mediators of ZER's impact on breast cancer cell behavior.
  • Targeting the Notch2 pathway could potentially enhance the therapeutic efficacy of zerumbone in breast cancer treatment.

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