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In Silico-Designed G-Quadruplex Targeting Peptide Attenuates VEGF-A Expression, Preventing Angiogenesis in Cancer

Nilanjan Banerjee1, Laboni Roy2, Suman Panda2

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Chemical Biology & Drug Design
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This study introduces a novel peptide that stabilizes the VEGF-A G-quadruplex structure, effectively reducing gene expression and blocking cancer angiogenesis. This peptide offers a promising therapeutic strategy for cancer treatment.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • Vascular endothelial growth factor-A (VEGF-A) drives angiogenesis, crucial for cancer growth.
  • The VEGF gene promoter contains a G-quadruplex (G4) structure that regulates its activity.
  • Cancer progression destabilizes the VEGF-A G4, increasing VEGF-A transcription and promoting angiogenesis.

Purpose of the Study:

  • To design and characterize a peptide that binds and stabilizes the VEGF-A G4 structure.
  • To investigate the peptide's effect on VEGF-A gene expression and downstream signaling.
  • To evaluate the peptide's potential to inhibit angiogenesis in cancer cells.

Main Methods:

  • High-resolution nuclear magnetic resonance (NMR) spectroscopy to study G4-peptide interactions.
  • Molecular dynamics simulations to elucidate binding mechanisms.
  • Quantitative Polymerase Chain Reaction (qPCR) and Western blotting to analyze gene and protein expression.
  • Assessment of anti-angiogenic effects in cancer models.

Main Results:

  • A designed peptide successfully binds and stabilizes the VEGF-A G4 structure.
  • Peptide-induced G4 stabilization significantly reduces VEGF-A gene expression.
  • The peptide treatment alters the VEGF-A signaling cascade and inhibits angiogenesis.
  • NMR and simulations provided detailed insights into the G4-peptide interaction.

Conclusions:

  • Peptides can be effectively designed to target and stabilize G-quadruplex structures like VEGF-A G4.
  • This approach offers a novel strategy for suppressing VEGF-A expression and blocking cancer angiogenesis.
  • The findings pave the way for developing peptide-based therapeutics for cancer treatment.