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Endostatin: an endogenous inhibitor of angiogenesis and tumor growth

M S O'Reilly1, T Boehm, Y Shing

  • 1Department of Surgery, Children's Hospital, Boston, Massachusetts 02115, USA.

Cell
|January 24, 1997
PubMed

Insights

Researchers discovered endostatin, an angiogenesis inhibitor derived from collagen XVIII, which effectively halts tumor growth and angiogenesis. This finding validates a new strategy for identifying endogenous angiogenesis inhibitors and demonstrates the potential of dormancy therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Angiogenesis is crucial for tumor growth and metastasis.
  • Endogenous angiogenesis inhibitors represent a promising therapeutic strategy.
  • Previous identification of angiostatin paved the way for discovering similar inhibitors.

Purpose of the Study:

  • To identify novel endogenous angiogenesis inhibitors.
  • To characterize the anti-angiogenic and anti-tumor properties of endostatin.
  • To evaluate the therapeutic potential of endostatin using a novel delivery method.

Main Methods:

  • A strategy similar to angiostatin identification was employed.
  • Endostatin, a fragment of collagen XVIII, was isolated and characterized.
  • E. coli-derived endostatin was administered via sustained release as a nonrefolded suspension.
  • Tumor regression, angiogenesis, proliferation, and apoptosis were assessed via immunohistochemistry.

Main Results:

  • Endostatin specifically inhibited endothelial proliferation and angiogenesis.
  • Administration of endostatin led to regression of primary tumors to dormant lesions.
  • Immunohistochemistry confirmed blocked angiogenesis and a balance of proliferation and apoptosis in tumor cells.
  • No significant toxicity was observed.

Conclusions:

  • Endostatin is a potent endogenous inhibitor of angiogenesis and tumor growth.
  • The findings validate a strategy for identifying endogenous angiogenesis inhibitors.
  • Protein fragments represent a potential class of angiogenesis inhibitors.
  • Sustained release of endostatin demonstrates effective dormancy therapy for tumors.

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