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Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Peptide conjugation: before or after nanoparticle formation?

Sabrina Valetti1, Simona Mura, Magali Noiray

  • 1Université Paris-Sud , Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, 92296 Châtenay-Malabry cedex, France.

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This study explores two methods for creating peptide-decorated squalenoyl gemcitabine nanoparticles for pancreatic cancer. Functionalizing nanoparticles before NP formation improved targeting and cancer cell killing.

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Area of Science:

  • Nanotechnology
  • Drug Delivery
  • Oncology

Background:

  • Squalenoyl gemcitabine nanoparticles (SQdFdC NPs) are investigated for pancreatic cancer therapy.
  • The CKAAKN peptide shows potential for targeting pancreatic cancer's microenvironment.

Purpose of the Study:

  • To compare two bioconjugation strategies for peptide-decorated SQdFdC NPs.
  • To evaluate the in vitro targeting efficiency and anti-cancer effects of these nanoparticles.

Main Methods:

  • Two methods were used: conjugating peptide after NP formation, and conjugating peptide before NP formation.
  • Nanoparticle characterization included size, zeta potential, and stability.
  • Surface plasmon resonance assessed specific interaction with sFRP-4 protein.
  • In vitro cell uptake and cytotoxicity assays were performed on MIA Paca-2 cells.

Main Results:

  • Both strategies yielded NPs that interacted with the target receptor.
  • Functionalization before NP formation resulted in enhanced target binding and avidity.
  • These optimized NPs showed increased cell uptake and cytotoxicity in pancreatic cancer cells.

Conclusions:

  • The strategy of conjugating the CKAAKN peptide before SQdFdC nanoparticle formation is superior.
  • This approach enhances in vitro targeting and anti-cancer efficacy for pancreatic cancer treatment.