Four-Dimensional Printing Hierarchy Scaffolds with Highly Biocompatible Smart Polymers for Tissue Engineering...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Developing advanced biomaterials for tissue engineering is crucial for regenerative medicine.
• Current scaffolds often lack the dynamic integration capabilities needed for seamless tissue repair.
• Smart polymers offer potential for creating responsive and adaptable biomedical constructs.

Purpose of the Study:

• To fabricate novel biomimetic gradient tissue scaffolds using 4D printing technology.
• To synthesize and characterize biocompatible, naturally derived smart polymers with tunable shape memory properties.
• To evaluate the potential of these scaffolds for enhanced cell adhesion, proliferation, and differentiation.

Main Methods:

• Synthesis of novel shape memory polymers from polycaprolactone triol and castor oil.
• Utilizing 3D printed sacrificial molds to create scaffolds with graded porosity.
• Characterization of polymer and scaffold properties including morphology, thermal, mechanical, and shape memory effects.
• Assessment of human bone marrow-derived mesenchymal stem cell response on the developed scaffolds.

Main Results:

• Successfully synthesized smart polymers with tunable glass transition temperatures (-8°C to 35°C) and excellent biocompatibility.
• Fabricated 4D printed scaffolds with controllable, graded microporosity mimicking natural tissue architecture.
• Demonstrated high shape-fixing (>92%) and full shape recovery at physiological temperatures.
• Observed significantly increased stem cell adhesion, proliferation, and differentiation on the novel smart polymer scaffolds compared to polycaprolactone.

Conclusions:

• Novel 4D printed biomimetic gradient tissue scaffolds were successfully developed using biocompatible smart polymers.
• The synthesized smart polymers exhibit tunable shape memory effects and promote enhanced cellular activity, indicating great potential for tissue engineering applications.
• This work advances the design of functional biomedical scaffolds through the integration of 4D printing technology and advanced smart biomaterials.