Modulating Angiogenesis by Proteomimetics of Vascular Endothelial Growth Factor

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Angiogenesis, the formation of new blood vessels, is crucial for tumor growth and metastasis.
• Vascular Endothelial Growth Factor A (VEGF-A) binding to its receptors (VEGFRs) drives angiogenesis.
• The precise balance of pro- and anti-angiogenic signals is not fully understood, hindering therapeutic manipulation.

Purpose of the Study:

• To design and evaluate sulfono-γ-AA peptide-based peptidomimetics that mimic VEGF's key binding interface (helix-α1) for VEGFR recognition.
• To investigate the differential effects of these peptidomimetics on angiogenesis.
• To explore their potential as therapeutic agents and molecular probes for VEGFR signaling.

Main Methods:

• Design of sulfono-γ-AA peptide-based helical peptidomimetics.
• Assessment of binding affinity to VEGF receptors.
• In vitro angiogenesis assays to evaluate functional effects (inhibition vs. activation).
• Analysis of selective binding to VEGFR-1 and VEGFR-2.
• Evaluation of stability against proteolytic hydrolysis.

Main Results:

• Both designed peptidomimetics (V2 and V3) demonstrated tight binding to VEGF receptors.
• V3 potently inhibited angiogenesis, while V2 effectively activated it.
• Selective binding was observed: V2 to VEGFR-1 and V3 to VEGFR-2.
• Both V2 and V3 showed high stability against proteolytic degradation.

Conclusions:

• Sulfono-γ-AA peptides can effectively mimic α-helical domains for protein recognition and modulation of protein-protein interactions.
• The distinct angiogenic effects of V2 and V3 highlight their potential to selectively switch angiogenic signaling pathways.
• These peptidomimetics represent promising candidates for therapeutic intervention in diseases driven by angiogenic imbalance and as tools to study VEGFR signaling mechanisms.