Electrostatic Gelatin Nanoparticles for Biotherapeutic Delivery

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Biological agents like extracellular vesicles (EVs) and growth factors are cleared rapidly in vivo, limiting their therapeutic use.
• Developing effective delivery systems is crucial for enhancing the efficacy of these regenerative agents.

Purpose of the Study:

• To create charged gelatin nanoparticles (GNPs) for electrostatic conjugation and sequestration of biological agents.
• To evaluate the efficacy of EV-GNP conjugates for tissue regeneration applications.

Main Methods:

• Gelatin nanoparticles (GNPs) were synthesized using nanoprecipitation with pH adjustments to achieve positive or negative charges.
• Characterization included DLS, XRD, FTIR, and TEM. Endotoxin and cytotoxicity tests were performed.
• Mesenchymal stem cell (MSC)-derived EVs were conjugated with positively charged GNPs, and their impact on macrophage activity was assessed in a transwell system.

Main Results:

• Positively and negatively charged GNPs were successfully synthesized, confirmed to be endotoxin-free and non-cytotoxic.
• Electrostatic conjugation of negatively charged MSC-EVs with positively charged GNPs was validated.
• EV-GNP conjugates within a gelatin hydrogel demonstrated bioactivity and a synergistic effect on macrophage secretome over five days.

Conclusions:

• Electrostatic coupling of biotherapeutics with gelatin biomaterials offers a promising strategy to overcome rapid clearance.
• This approach enhances the therapeutic potential of biological agents for tissue regeneration.