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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Area of Science:

  • Nanomedicine
  • Biomaterials Science
  • Molecular Targeting

Background:

  • Gold nanoparticles (GNPs) offer versatile platforms for biomedical applications.
  • Targeted delivery systems are crucial for enhancing therapeutic efficacy and reducing side effects.
  • Integrin receptors, such as αvβ3, are overexpressed in various cancers, making them attractive targets.

Purpose of the Study:

  • To investigate the physicochemical properties, biofunctionalization, and cellular internalization mechanisms of peptide-functionalized gold nanoparticles (GNPs).
  • To focus on a cyclic αvβ3 integrin-targeting ligand (cRGD) integrated with a gold-binding peptide (GCt) and a fluorescent dye (FITC).
  • To evaluate the potential of these targeted GNPs for tumor-selective theranostics.

Main Methods:

  • Characterization of GNPs and biofunctionalized GNPs (b-GNPs) using DLS, zeta potential, UV-vis spectroscopy, SEM, FTIR, and XPS.
  • Theoretical modeling to understand nano-bio interface interactions.
  • Cellular uptake studies in αvβ3-expressing (WM266 melanoma) and non-expressing (HeLa adenocarcinoma) cells to assess receptor-mediated internalization.

Main Results:

  • Successful functionalization of GNPs with the cRGD-GCt-FITC moiety was confirmed.
  • Analysis revealed distinct chemical states and charge transfer at the nano-bio interface.
  • Selective uptake and accumulation of b-GNPs were observed in αvβ3-overexpressing cells, with RGD-functionalized GNPs inducing pro-apoptotic effects.

Conclusions:

  • Biomimetic gold nanoparticles functionalized with cRGD show promise for tumor-selective targeting.
  • This approach addresses limitations in current RGD- and gold nanoparticle-based nanomedicine regarding toxicity and targeting.
  • The findings highlight potential for developing targeted theranostic strategies for cancer treatment.