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Related Experiment Video

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Protein Kinase C-delta Inhibitor Peptide Formulation using Gold Nanoparticles
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Biologically inspired stealth peptide-capped gold nanoparticles.

Ann K Nowinski1, Andrew D White, Andrew J Keefe

  • 1Department of Chemical Engineering, University of Washington , Seattle, Washington 98195, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 4, 2014
PubMed
Summary

This study introduces a novel peptide-capped gold nanoparticle system that prevents aggregation in human serum. This biocompatible platform enhances nanoparticle stability and reduces unwanted cell uptake, paving the way for advanced nanomedicine applications.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Nanoparticle systems often aggregate in biological fluids due to protein binding, limiting their therapeutic potential.
  • Mimicking natural protein surface charges with amino acids like glutamic acid and lysine can enhance nanoparticle stability.
  • Developing biocompatible, non-toxic nanoparticle platforms is crucial for in vivo applications.

Purpose of the Study:

  • To develop a peptide-capped gold nanoparticle platform resistant to aggregation in human serum.
  • To investigate the biocompatibility and cellular uptake of these novel nanoparticles.
  • To demonstrate targeted cell delivery using peptide functionalization without synthetic polymers.

Main Methods:

  • Synthesized gold nanoparticles capped with a multifunctional peptide (EKEKEKE-PPPPC-Am) mimicking natural protein surface charges.
  • Assessed particle stability using optical spectroscopy and dynamic light scattering in various biological conditions.
  • Evaluated in vitro cellular interactions, including non-specific and targeted uptake, and cytotoxicity in endothelial and macrophage cell lines.
  • Utilized inductively coupled plasma mass spectroscopy for quantifying cellular nanoparticle uptake.

Main Results:

  • The peptide-capped gold nanoparticles remained stable in undiluted human serum at 37°C for 24 hours.
  • Nonspecific cellular uptake was significantly minimized in both non-phagocytic and phagocytic cell lines.
  • Cytotoxicity studies confirmed the nanoparticles did not affect cell viability.
  • Functionalized nanoparticles with cyclic RGD demonstrated specific targeting and enhanced uptake in endothelial cells, outperforming a scrambled sequence control.

Conclusions:

  • Peptide-capped gold nanoparticles offer a stable and biocompatible alternative to traditional synthetic coatings.
  • This platform effectively reduces non-specific interactions and allows for targeted delivery.
  • Peptide sequence extension provides a versatile method for functionalization, avoiding complex conjugation chemistries.