Self-crosslinkable hyaluronate-based hydrogels as a soft tissue filler

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Dermatology

Background:

• Global interest in anti-aging and skin care drives demand for soft tissue fillers.
• Commercial hyaluronic acid (HA)-based fillers have limitations due to residual chemical crosslinking agents and associated side effects.
• A need exists for novel crosslinking systems using non-toxic agents to improve filler safety and efficacy.

Purpose of the Study:

• To develop a novel injectable hydrogel soft tissue filler with improved properties.
• To overcome the limitations of current commercial HA-based fillers by eliminating toxic chemical crosslinkers.
• To evaluate the mechanical properties, tissue adhesion, injectability, and biocompatibility of the new hydrogel filler.

Main Methods:

• Hyaluronic acid (HA) was modified with catechol groups to create HA-DA.
• HA-DA hydrogels were formed via self-oxidation crosslinking under physiological conditions (pH 7.4), accelerated by dissolved oxygen.
• Mechanical properties, injectability (injection force), tissue adhesion, displacement stability, cell viability, proliferation, and biocompatibility were assessed.

Main Results:

• The fabricated HA-DA filler exhibited enhanced mechanical properties and required low injection force.
• Catechol groups provided strong tissue adhesion, improving displacement stability at the injection site.
• HA-DA filler demonstrated excellent cell viability, proliferation, and overall biocompatibility.
• The self-oxidation crosslinking process occurred effectively under physiological conditions without chemical crosslinkers.

Conclusions:

• The developed HA-DA hydrogel represents a promising novel soft tissue filler.
• This new filler overcomes limitations of commercial products by utilizing a non-toxic, self-crosslinking system.
• HA-DA hydrogels show significant potential for safe and effective soft tissue augmentation in cosmetic and dermatological applications.