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Functionally active VEGF fusion proteins.

M V Backer1, J M Backer

  • 1Sib Tech, Incorporated, 705 North Mountain Road, Newington, Connecticut 06111, USA. mbacker@sibtech.com

Protein Expression and Purification
|September 26, 2001
PubMed
Summary
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Vascular endothelial growth factor (VEGF) fusion proteins, engineered with N-terminal extensions, activate VEGFR-2 signaling and cell responses. These modified VEGF proteins show potential for targeted delivery in angiogenesis research.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Angiogenesis, the formation of new blood vessels, is regulated by vascular endothelial growth factor (VEGF).
  • VEGF exerts its effects through specific receptors, primarily VEGFR-2, which are upregulated at sites of angiogenesis.
  • Targeted delivery of therapeutic agents to angiogenic sites is a significant challenge in medicine.

Purpose of the Study:

  • To investigate the biological activity of VEGF fusion proteins with N-terminal extensions.
  • To assess the potential of these fusion proteins for receptor-mediated targeting in angiogenesis.

Main Methods:

  • Construction, expression in E. coli, and purification of human VEGF fusion proteins (VEGF121, VEGF165, VEGF189) with a 158-amino acid N-terminal extension.

Related Experiment Videos

  • Assays to measure VEGFR-2 autophosphorylation and downstream signaling.
  • Cell contraction assays in cells overexpressing VEGFR-2.

    • Main Results:

    • VEGF fusion proteins successfully induced VEGFR-2 autophosphorylation and downstream signaling.
    • These fusion proteins also triggered cell contraction in VEGFR-2-overexpressing cells.
    • While N-terminal extensions reduced binding affinity to VEGFR-2, the fusion proteins were effective at saturating concentrations.

    Conclusions:

    • VEGF fusion proteins retain biological activity and can stimulate VEGFR-2 signaling pathways.
    • These engineered proteins demonstrate potential as vehicles for targeted delivery to endothelial cells involved in angiogenesis.