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Stabilizing Scaffold for Short Peptides Based on Knottins.

Evgenii Beloborodov1, Elena Iurova1, Dmitrii Sugak1

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Researchers explored using animal and plant toxins to stabilize bombesin (BBN) for cancer therapy. Incorporating BBN into arachnid toxins significantly improved its stability and bioavailability with low toxicity.

Keywords:
Bombesincancerinhibitory cystine knotpeptide toxinproteins.stability

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Area of Science:

  • Biochemistry and Molecular Biology
  • Peptide Therapeutics
  • Drug Delivery Systems

Background:

  • Bombesin (BBN) is a peptide targeting cancer cell receptors but suffers from poor in vivo stability.
  • Existing BBN formulations lack the necessary stability for effective therapeutic use.

Purpose of the Study:

  • To enhance the bioavailability and stability of bombesin (BBN) using peptide toxins as scaffolds.
  • To investigate the potential of inhibitory cystine knot structures in stabilizing therapeutic peptides.

Main Methods:

  • Solid-phase peptide synthesis was used to incorporate short bombesin into arthropod and plant toxin domains.
  • High-performance liquid chromatography assessed stability; cell-based assays evaluated receptor binding and cytotoxicity.

Main Results:

  • Incorporating bombesin (BBN) into arachnid toxins between the first and second cysteine residues enhanced in vitro stability.
  • Improved bioavailability and low cytotoxicity were observed in the modified BBN structures.

Conclusions:

  • Arachnid toxins featuring an inhibitory cystine knot serve as effective scaffolds for stabilizing therapeutic peptides like BBN.
  • This approach offers a promising strategy for developing more stable and bioavailable peptide-based cancer therapies.