Nanoforming Hyaluronan-Based Thermoresponsive Hydrogels: Optimized and Tunable Functionality in Osteoarthritis...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Rheumatology

Background:

• Hyaluronic acid (HA) is a key component in viscosupplementation for osteoarthritis (OA) pain.
• Current HA treatments face limitations due to rapid in vivo degradation by enzymes and oxidative stress.
• There is a need for advanced HA formulations with prolonged residence time and enhanced functionality.

Purpose of the Study:

• To develop novel thermoresponsive, nanoforming hyaluronic acid derivatives for improved viscosupplementation.
• To engineer HA-based polymers with enhanced viscoelastic properties and in vivo stability.
• To evaluate the potential of these advanced HA systems as next-generation OA treatments.

Main Methods:

• Synthesis of HA-based polymers using sulfo-dibenzocyclooctyne-PEG4-amine linkers and poly(N-isopropylacrylamide) via green chemistry.
• Characterization of thermoresponsive nanoparticle formation above 30 °C.
• In vitro assessment of degradation resistance (enzymatic and oxidative) and viscoelastic properties.

Main Results:

• Successfully synthesized thermoresponsive HA-PEG-PNIPAM nanoparticles with tunable viscoelastic properties.
• Demonstrated spontaneous and reversible nanoparticle formation above 30 °C.
• Achieved significantly enhanced in vitro resistance to enzymatic and oxidative degradation compared to commercial HA.
• Observed optimal viscoelastic hydrogel properties and reduced injection force in equine synovial fluid.

Conclusions:

• Engineered HA derivatives show promise as long-acting viscosupplementation agents.
• The developed thermoresponsive nanoparticles offer a potential breakthrough for osteoarthritis pain management.
• These advanced HA-based systems represent a next-generation approach to viscosupplementation therapy.