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Cell therapy using encapsulated cells producing endostatin.

R Bjerkvig1, T A Read, P Vajkoczy

  • 1University of Bergen, Bergen, Norway.

Acta Neurochirurgica. Supplement
|October 9, 2003
PubMed
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This study developed encapsulated cells that secrete endostatin, a protein that inhibits blood vessel growth. This novel approach shows promise for treating glioblastoma by reducing tumor growth and spread.

Area of Science:

  • Biomedical Engineering
  • Cancer Biology
  • Drug Delivery Systems

Background:

  • Glioblastoma treatment remains challenging despite aggressive therapies, with poor patient prognosis.
  • Anti-angiogenic therapy, using agents like endostatin, could potentially delay glioblastoma recurrence.
  • Challenges include endostatin's short half-life and the blood-brain barrier, limiting its systemic use.

Purpose of the Study:

  • To develop and evaluate genetically engineered cells secreting endostatin, encapsulated for sustained local delivery.
  • To assess the efficacy of this localized endostatin delivery in a rat glioma model.
  • To investigate the impact on tumor vasculature, microcirculation, and cell invasion.

Main Methods:

  • Genetically engineered human embryonal kidney 293 cells transfected with the endostatin gene.

Related Experiment Videos

  • Encapsulation of these cells within calcium cross-linked alginate gel beads for sustained release.
  • Implantation of alginate beads into rat brains and assessment of cell viability and endostatin release.
  • Intravital video microscopy to visualize anti-angiogenic effects on C6 rat glioma.

    • Main Results:

    • Alginate-encapsulated cells demonstrated sustained endostatin release for up to 12 months with moderate cell viability loss.
    • Endostatin significantly affected tumor-associated microcirculation, reducing vessel density, diameter, and functionality.
    • Normal microcirculation remained unaffected, indicating targeted anti-angiogenic activity.
    • Tumor cell migration and invasion were substantially reduced in endostatin-treated animals.

    Conclusions:

    • Encapsulated, engineered cells offer a viable strategy for sustained local endostatin delivery.
    • This localized therapy effectively targets and inhibits glioblastoma angiogenesis and progression.
    • The approach shows potential for improving glioblastoma treatment by overcoming delivery challenges.