Highly elastic bioactive bR-GelMA micro-particles: synthesis and precise micro-fabrication via stop-flow lithography

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Osteoporosis presents a major public health concern, driving the need for advanced bone regeneration strategies.
• Gelatin methacrylate (GelMA) hydrogels are promising for bone repair, but traditional fabrication methods like aqueous two-phase systems (ATPS) yield inconsistent results.
• Existing methods struggle with mechanical property control and structural uniformity in GelMA-based materials.

Purpose of the Study:

• To develop novel methods and parameters for fabricating bR-GelMA micro-particles with enhanced properties.
• To utilize stop-flow lithography (SFL) for precise control over micro-particle formation, overcoming limitations of ATPS.
• To create uniform, stable, and highly elastic micro-particles for biomedical applications, specifically bone regeneration.

Main Methods:

• Synthesis of bR-GelMA (bioactive RGD peptide-modified GelMA) with bioactive glass particles.
• Fabrication of elastic micro-particles using stop-flow lithography (SFL).
• Characterization of micro-particle properties, including degradation, cell proliferation, mechanical strength, and flexibility.

Main Results:

• SFL enabled precise fabrication of uniform and stable GelMA-based micro-particles.
• The resulting micro-particles exhibited rapid degradation and enhanced cell proliferation.
• Significant improvements in mechanical strength were achieved without sacrificing flexibility.

Conclusions:

• Stop-flow lithography (SFL) offers superior control over GelMA micro-particle fabrication compared to ATPS.
• The developed elastic micro-particles show great potential for effective bone regeneration.
• This innovative SFL approach paves the way for advanced therapeutic applications in tissue engineering.