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Non-heparan sulfate-binding interactions of endostatin/collagen XVIII in murine development

Natalia Rychkova1, Sonja Stahl, Sabine Gaetzner

  • 1Department of Human Genetics, University of Würzburg, Biozentrum, Am Hubland, D-97074 Würzburg, Germany.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|December 23, 2004
PubMed

Insights

Knobloch syndrome involves eye and cranial defects due to collagen XVIII mutations. Endostatin, a collagen XVIII domain, binds to developing eye blood vessels, influencing disease pathology.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Knobloch syndrome is linked to mutations in collagen XVIII, affecting its C-terminal endostatin domain.
  • Endostatin is a known inhibitor of angiogenesis and tumor growth, suggesting a role in vascular development.

Purpose of the Study:

  • To investigate the binding partners and tissue distribution of endostatin and related molecules during embryonic development.
  • To elucidate the role of collagen XVIII's endostatin domain in the pathogenesis of Knobloch syndrome.

Main Methods:

  • Utilized alkaline phosphatase fusion proteins to create affinity probes for endostatin, vascular endothelial growth factor (VEGF), and collagen XV.
  • Examined binding patterns in murine embryonal development, including collagen XVIII knockout mice.
  • Assessed the role of heparan sulfate binding sites in molecular interactions.

Main Results:

  • Endostatin predominantly binds to vascular mesenchyme in the developing eye, consistent with Knobloch syndrome phenotypes.
  • VEGF164 binds to both vascular and non-vascular tissues, including the developing brain and cornea.
  • A modified endostatin probe lacking heparan sulfate binding showed enhanced specificity, while VEGF binding was abolished without its binding site.

Conclusions:

  • The C-terminal endostatin domain of collagen XVIII possesses a significant tissue-binding site.
  • Endostatin binding to ocular vasculature is crucial in Knobloch syndrome, and this interaction can occur independently of heparan sulfates.
  • Differential binding of endostatin and VEGF highlights their distinct roles in embryonic development.

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