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Gold nanoparticles (AuNPs) were functionalized for targeted drug delivery. These AuNPs were clustered into larger gold nanoparticle clusters (AuNCs) for enhanced tumor accumulation via the EPR effect.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Gold nanoparticles (AuNPs) are effective drug carriers due to biocompatibility and tumor-targeting via the enhanced permeability and retention (EPR) effect.
  • Developing AuNPs with improved drug loading and targeted delivery remains a key challenge in nanomedicine.

Purpose of the Study:

  • To design and synthesize AuNPs functionalized with block polymers for electrostatic incorporation of cytosine-guanine oligonucleotide (CpG ODN).
  • To cross-link these ODN-incorporated AuNPs into larger gold nanoparticle clusters (AuNCs) using click chemistry for enhanced tumor targeting.

Main Methods:

  • Synthesized azide-functionalized poly(ethyl glycol)-polyethylenimine block polymers for AuNP functionalization.
  • Incorporated CpG ODN onto AuNPs via electrostatic interactions.
  • Utilized click chemistry with an MMP-2 cleavable peptide linker to cross-link AuNPs into AuNCs.
  • Characterized AuNPs and AuNCs using techniques including NMR, FTIR, TEM, Raman spectroscopy, zeta-potential, and gel-retardation assays.

Main Results:

  • Successfully synthesized azide-PEG-grafted branched polyethylenimine and fabricated 4.02 ± 0.45 nm AuNPs.
  • Confirmed successful introduction of azide groups onto AuNP surfaces.
  • Achieved complete CpG ODN sequestration by AuNPs at a CpG:AuNP weight ratio > 1:2.5.
  • Demonstrated that AuNP clustering is dependent on the alkyne linker-to-AuNP ratio.

Conclusions:

  • Developed a novel method for creating AuNCs as gene carriers through click chemistry.
  • The engineered AuNCs show potential for high therapeutic accumulation at tumor sites, leveraging the EPR effect.
  • This platform offers a tunable approach for targeted gene delivery applications.