A hydrogel/P(VDF-TrFE) system for enhanced bone regeneration with controllable self-sustained electrical cues

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Critical-sized bone defects pose significant healing challenges due to limited self-healing capacity.
• Biomaterials that mimic the natural bone regenerative microenvironment are crucial for effective healing.
• Current approaches often struggle to provide both biomimetic and instructive cues simultaneously.

Purpose of the Study:

• To develop novel Chitosan-Gelatin (CS-Gel) based hydrogel/Poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) systems for enhanced bone regeneration.
• To investigate the potential of these systems to provide biomimetic and sustained electrical cues.
• To evaluate the in vitro and in vivo efficacy of these systems in promoting bone healing.

Main Methods:

• Fabrication of bilayer hydrogel membranes composed of CS-Gel on P(VDF-TrFE) layers.
• Utilizing the dipole orientation of P(VDF-TrFE) to generate self-sustained electrical cues.
• Assessing macrophage polarization (M2 phenotype) and stem cell differentiation in vitro.
• Evaluating new bone formation and anti-inflammatory cytokine expression in vivo.

Main Results:

• The hydrogel/P(VDF-TrFE) systems effectively polarized macrophages towards the M2 phenotype.
• Enhanced stem cell differentiation was observed in vitro.
• Increased expression of anti-inflammatory cytokines and significant new bone formation were noted in vivo.
• The bilayer structure successfully decoupled electrical stimulation from chemical composition, ensuring functional hydrogel surfaces.

Conclusions:

• The developed hydrogel/P(VDF-TrFE) systems offer a promising strategy for accelerating bone regeneration.
• Combining biomimetic environments with self-sustained electrical cues is an effective approach.
• This work presents a novel preparation method for functional hydrogel/P(VDF-TrFE) systems for regenerative medicine applications.