Streptavidin Functionalized Hyaluronic Acid Hydrogels for Controlled and Customizable Drug Delivery.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Drug Delivery

Background:

• Hyaluronic acid (HA) hydrogels are promising for tissue repair due to in situ gelation, tunable mechanics, and therapeutic delivery capabilities.
• However, rapid diffusion limits therapeutic windows for encapsulated agents in HA hydrogels.
• Developing methods to control drug release kinetics is crucial for effective tissue regeneration.

Purpose of the Study:

• To develop functionalized HA hydrogels for controlled spatiotemporal delivery of therapeutic agents.
• To enhance agent retention and prolong localized delivery for improved tissue repair.
• To create a versatile platform for staged delivery of multiple therapeutic agents.

Main Methods:

• Functionalization of norbornene-modified HA (NorHA) hydrogels with streptavidin via thiol-ene click chemistry.
• Incorporation of matrix metalloproteinase (MMP) degradable crosslinks to tune hydrogel degradation.
• Encapsulation and controlled release studies of biotin-modified agents (fluorophores, liposomes) in functionalized hydrogels.

Main Results:

• Streptavidin functionalization successfully tethered biotin-modified agents, increasing retention in vitro and in vivo without altering hydrogel properties.
• Tunable hydrogel degradation via MMP crosslinks allowed cellular invasion while maintaining agent retention.
• Functionalized hydrogels demonstrated controlled release of liposome-encapsulated therapeutics, enabling staged delivery.

Conclusions:

• Streptavidin-functionalized HA hydrogels offer a promising platform for controlled therapeutic delivery in tissue repair.
• This approach overcomes limitations of rapid diffusion, enabling prolonged localized drug release.
• The material supports enhanced healing and tissue regeneration through precise spatiotemporal control of therapeutic agents.