Stimuli-responsive, methyl cellulose-based, interpenetrating network hydrogels: Non-covalent design, injectability,...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Injectable hydrogels are vital for minimally invasive biomedical applications.
• Existing hydrogels often compromise mechanical strength, stability, and biocompatibility.
• Stimuli-responsive hydrogels require robust designs for advanced therapeutic applications.

Purpose of the Study:

• To develop a stimuli-responsive, injectable hydrogel with enhanced properties.
• To create a dual-network system for improved mechanical strength and stability.
• To demonstrate the hydrogel's potential for controlled drug delivery and osteoarthritis treatment.

Main Methods:

• Molecular design of a non-covalent double-network hydrogel using methyl cellulose.
• Incorporation of host-guest cross-linking sites into a thermo-responsive network.
• Sequential network formation and interpenetration for enhanced hydrogel properties.

Main Results:

• The hydrogel exhibits high cell viability (>90%) and rapid self-healing (<1 min).
• Achieved suitable injection pressure (1.1 kPa) and controllable drug release (heat, chemicals, ultrasound).
• Successfully treated osteoarthritis in a rat model using diclofenac-loaded hydrogel.

Conclusions:

• The developed hydrogel offers a promising platform for drug delivery and biomedical applications.
• The dual-network design overcomes limitations of conventional injectable hydrogels.
• This system can be adapted for various therapeutic and bio-related applications.