Nanogel delivery systems for cationic peptides: More than a 'One Size Fits All' solution.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery

Background:

• Hyaluronic acid-based nanogels are promising biodegradable carriers for peptide therapeutics.
• Understanding peptide-nanogel interactions is crucial for optimizing drug delivery systems.

Purpose of the Study:

• To investigate the relationship between peptide structure (charge, hydrophobicity) and its encapsulation within hyaluronic acid nanogels.
• To evaluate the impact of peptide properties on nanogel characteristics, peptide structure, release kinetics, and in vitro activity.

Main Methods:

• Microfluidics was used to assemble peptide-loaded nanogels.
• Dynamic light scattering, laser Doppler electrophoresis, and small angle neutron scattering were employed to characterize nanogel size and surface properties.
• Changes in peptide secondary structure, release profiles, and in vitro antimicrobial activity were assessed.

Main Results:

• Hydrophobic peptides exhibited stronger binding, internal localization, resulting in spherical nanogels with smoother surfaces and slower release.
• Cationic and hydrophilic peptides localized on the nanogel surface, leading to fluffier structures and rapid, complete release.
• Nanogel characteristics and peptide release were directly correlated with peptide charge and hydrophobicity.

Conclusions:

• Peptide properties critically determine encapsulation efficiency and release kinetics from hyaluronic acid nanogels.
• Tailoring nanogel design based on therapeutic peptide characteristics is essential for effective drug delivery.
• These findings highlight the versatility of nanogels but underscore the need for peptide-specific optimization.