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Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen
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Antiestrogens, aromatase inhibitors, and apoptosis in breast cancer

Rebecca B Riggins1, Amy H Bouton, Minetta C Liu

  • 1Department of Oncology and Physiology, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC 20057, USA.

Vitamins and Hormones
|August 23, 2005
PubMed

Insights

Antiestrogens induce apoptosis in estrogen receptor-positive breast cancer cells. Understanding these cell death mechanisms is key to overcoming drug resistance in patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Antiestrogens are crucial for estrogen receptor-positive breast cancer treatment.
  • Therapeutic resistance to antiestrogens is a significant clinical challenge.
  • Apoptosis induction by antiestrogens is a key mechanism of action.

Purpose of the Study:

  • To review antiestrogen-induced apoptosis in vitro and in vivo.
  • To explore the molecular mechanisms underlying antiestrogen efficacy.
  • To discuss the role of apoptotic defects in antiestrogen resistance.

Main Methods:

  • Review of clinical utility of antiestrogens and aromatase inhibitors.
  • Analysis of apoptogenic mechanisms in cell culture models.
  • Discussion of signaling pathways involved in apoptosis.

Main Results:

  • Key signaling components include Bcl-2 family, cytokines, p53, NFkappaB, IRF-1, PI3K/Akt, and caspases.
  • Evidence suggests apoptotic defects contribute to acquired and de novo resistance.
  • Antiestrogens trigger cell death pathways critical for tumor control.

Conclusions:

  • Understanding antiestrogen-induced apoptosis is vital for overcoming resistance.
  • Targeting apoptotic pathways may offer new therapeutic strategies.
  • Defects in apoptosis are implicated in treatment failure for breast cancer.

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