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A Fluorescence-based Protocol for Preliminary Screening of Protein Synthesis Inhibitors from Natural Sources
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Bufalin is a potent small-molecule inhibitor of the steroid receptor coactivators SRC-3 and SRC-1

Ying Wang1, David M Lonard1, Yang Yu1

  • 1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA.

Cancer Research
|January 7, 2014
PubMed

Insights

Bufalin, a cardiac glycoside, effectively inhibits SRC-3 and SRC-1 coactivators, crucial in cancer progression. This small molecule shows promise as a broad-spectrum cancer therapeutic, reducing tumor growth in preclinical models.

Area of Science:

  • Molecular Biology
  • Oncology
  • Pharmacology

Background:

  • Transcription factors rely on coactivators to regulate gene expression.
  • The p160 steroid receptor coactivator (SRC) family (SRC-1, SRC-2, SRC-3) plays a significant role in cancer cell proliferation, invasion, and metastasis.
  • SRC family members are potential therapeutic targets for novel chemotherapeutics.

Purpose of the Study:

  • To identify small-molecule inhibitors targeting the SRC coactivator family.
  • To evaluate the efficacy of identified inhibitors in preclinical cancer models.

Main Methods:

  • High-throughput screening of small molecules.
  • Assays to determine SRC-3 and SRC-1 inhibition.
  • In vitro cancer cell growth inhibition assays.
  • In vivo mouse xenograft models of breast cancer using nanoparticle delivery systems.

Main Results:

  • Bufalin was identified as a potent inhibitor of SRC-3 and SRC-1.
  • Bufalin induced SRC-3 protein degradation.
  • Bufalin demonstrated potent cancer cell growth inhibition at nanomolar concentrations.
  • Nanoparticle-formulated bufalin reduced tumor growth in a mouse xenograft model.

Conclusions:

  • Bufalin is a potent small-molecule inhibitor of SRC-3 and SRC-1.
  • Bufalin exhibits anti-cancer activity both in vitro and in vivo.
  • Bufalin represents a promising candidate for a broad-spectrum cancer therapeutic.

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