Triggerable Degradation of Polyurethanes for Tissue Engineering Applications.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Optimizing scaffold degradation rates is crucial for effective tissue regeneration.
• Current degradable polymers often lack tunable degradation mechanisms, relying on passive processes.
• Developing materials with controllable degradation is essential for diverse tissue repair applications.

Purpose of the Study:

• To introduce a novel family of reduction-sensitive biodegradable elastomeric polyurethanes (PU-SS).
• To demonstrate that PU-SS degradation can be initiated and accelerated by glutathione (GSH).
• To explore the potential of PU-SS for tunable scaffold degradation in tissue engineering.

Main Methods:

• Synthesized polyurethanes (PU-SS) with varying disulfide bond content.
• Processed PU-SS into films and electrospun fibrous scaffolds.
• Evaluated mechanical properties, elasticity, degradation kinetics with GSH, cell toxicity, and in vivo inflammatory response.

Main Results:

• PU-SS materials exhibited robust mechanical properties and high elasticity.
• GSH addition significantly accelerated PU-SS degradation, with rates dependent on disulfide content.
• Electrospun PU-SS scaffolds supported fibroblast growth in vitro and showed minimal inflammatory response in vivo.
• Polymers and degradation products demonstrated no significant cell toxicity.

Conclusions:

• This new family of reduction-sensitive polyurethanes offers controllable degradation via GSH.
• The tunable degradation rate of PU-SS scaffolds can be tailored by adjusting disulfide bond concentration.
• These advanced materials hold significant potential for directed scaffold degradation to enhance tissue regeneration.