Heparin-Mimicking Sulfonated Polymer Nanoparticles via RAFT Polymerization-Induced Self-Assembly

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Regenerative Medicine

Background:

• Heparin is crucial for wound healing and tissue regeneration by stabilizing fibroblast growth factors (FGF).
• Biological heparin poses risks due to batch variability and contamination, necessitating synthetic alternatives.
• Highly sulfonated polymers are being explored as effective heparin mimics.

Purpose of the Study:

• To synthesize and characterize novel heparin-mimicking nanoparticles.
• To evaluate the efficacy of these nanoparticles in cellular proliferation assays.
• To assess the potential of synthetic nanoparticles as alternatives to biological heparin.

Main Methods:

• Aqueous polymerization-induced self-assembly (PISA) of styrene using poly(2-acrylamido-2-methylpropane sodium sulfonate) (P(AMPS)) macro-RAFT agents.
• Characterization of nanoparticle morphology and size using light scattering and electron microscopy.
• In vitro evaluation of nanoparticle toxicity and cellular proliferation effects.

Main Results:

• Spherical heparin-mimicking nanoparticles were successfully synthesized.
• Nanoparticles demonstrated no toxicity against mammalian cells but exhibited hemolytic activity.
• The synthesized nanoparticles outperformed both heparin and linear P(AMPS) in cellular proliferation assays.

Conclusions:

• Synthetic heparin-mimicking nanoparticles can be effectively produced via PISA.
• These nanoparticles show potential for wound healing and tissue regeneration applications.
• The enhanced performance is attributed to the high density of sulfonated groups on the nanoparticle surface, improving bFGF stabilization.