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Cucurbitacin E targets proliferating endothelia

M D Duncan1, K L Duncan

  • 1Surgical Service, Veterans Affairs Medical Center, Washington, D.C., USA.

The Journal of Surgical Research
|April 1, 1997
PubMed
Summary
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Cucurbitacin E (CuE) potently inhibits proliferating human endothelial cells by disrupting their actin cytoskeleton. This actin-disrupting agent shows preferential toxicity towards rapidly dividing cells, offering a potential therapeutic strategy for vascular proliferation.

Area of Science:

  • Oncology
  • Cell Biology
  • Pharmacology

Background:

  • Tumor vasculature, characterized by proliferating endothelial cells, presents a viable target for anti-cancer drug development.
  • Cucurbitacin E (CuE) is an established actin-disrupting agent with potential anti-proliferative properties.

Purpose of the Study:

  • To investigate the hypothesis that cucurbitacin E (CuE) preferentially inhibits proliferating versus quiescent endothelial cells.
  • To determine the effects of CuE on endothelial cell actin cytoskeleton and cell cycle progression.

Main Methods:

  • Human endothelial cell lines (ECV304, HUVEC) in log-phase (proliferating) and confluent (quiescent) states were treated with varying concentrations of CuE.
  • Cell toxicity was assessed using the sulforhodamine B assay.

Related Experiment Videos

  • Actin cytoskeleton was visualized via rhodamine-phalloidin staining, and cell cycle distribution was analyzed by flow cytometry.

    • Main Results:

    • CuE demonstrated significantly higher toxicity towards log-phase proliferating endothelial cells compared to quiescent cells (lower LD50 values).
    • Prolonged exposure (24-96 hours) to CuE at LD50 concentrations was required for persistent growth inhibition.
    • CuE induced F-actin accumulation in proliferating cells and appeared to disrupt the actin cytoskeleton, while quiescent cells showed normal actin structure.

    Conclusions:

    • Cucurbitacin E preferentially and potently inhibits proliferating human endothelial cells in vitro.
    • CuE's mechanism involves the disruption of the actin cytoskeleton in proliferating endothelial cells.
    • Low concentrations of CuE may effectively inhibit vascular proliferation by targeting actin dynamics.