Peptide-derivatized shell-cross-linked nanoparticles. 1. Synthesis and characterization

Area of Science:

• Nanotechnology
• Bioconjugation Chemistry
• Cellular Biology

Background:

• Protein transduction domains (PTDs) enhance cellular uptake of molecules.
• Shell-cross-linked (SCK) nanoparticles offer a versatile platform for drug delivery.
• Controlled functionalization is key to optimizing nanoparticle-mediated cellular delivery.

Purpose of the Study:

• To conjugate the HIV-1 Tat protein transduction domain (PTD) to SCK nanoparticles.
• To investigate the effect of varying PTD conjugation density on nanoparticle cell surface binding and transduction efficiency.
• To develop a scalable method for producing peptide-functionalized SCK nanoparticles.

Main Methods:

• Synthesis of SCK nanoparticles via block copolymer self-assembly.
• Global solution-state functionalization strategy to attach PTDs to SCK nanoparticles.
• Quantification of PTD conjugation using UV-visible spectroscopy and phenylglyoxal analysis.

Main Results:

• SCK nanoparticles were successfully functionalized with PTDs at controlled densities (nominally 52, 104, and 210 peptides per particle).
• Experimental measurements confirmed PTD conjugation levels via two independent methods.
• The study quantified the feasibility and efficiency of intracellular internalization for the PTD-functionalized SCK nanoparticles.

Conclusions:

• The conjugation of PTDs to SCK nanoparticles effectively enhances cell surface binding and transduction.
• Increasing the density of PTDs on SCK nanoparticles improves the efficiency of cellular internalization.
• This approach provides a viable strategy for developing advanced nanoparticle-based delivery systems.