Gelatin-Based Polymers Can Be Processed to Highly Resilient Biocompatible Porous Hydrogel Scaffolds for Soft Tissue...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Tissue regeneration is influenced by the mechanical properties of the surrounding environment, particularly tissue stiffness.
• Injectable hydrogels offer minimally invasive delivery for medical applications.
• Natural polymer hydrogels exhibit biocompatibility but often lack the combination of low stiffness and high resilience.

Purpose of the Study:

• To develop novel gelatin-based injectable hydrogels for soft tissue regeneration.
• To investigate the impact of formulation on hydrogel resilience, microstructure, biocompatibility, and mechanical properties.
• To achieve adjustable stiffness and high resilience in natural polymer-based hydrogels.

Main Methods:

• Formulation of novel gelatin-based injectable hydrogels.
• Assessment of hydrogel resilience, mechanical properties (modulus), and microstructure using Environmental Scanning Electron Microscopy (ESEM).
• Evaluation of hydrogel biocompatibility using fibroblast and pre-adipocyte cell lines.

Main Results:

• Non-foamed hydrogels achieved at least 95% resilience; porous hydrogels maintained over 90% resilience.
• Hydrogels demonstrated adjustable modulus, mimicking soft and very soft tissue mechanical properties without compromising resilience.
• ESEM revealed interconnected, round pore structures in porous hydrogels, suitable for cell migration and nutrient transport.
• Biocompatibility tests confirmed high direct and indirect biocompatibility with fibroblasts and pre-adipocytes.

Conclusions:

• The developed gelatin-based hydrogels offer tunable stiffness and excellent resilience, suitable for soft tissue regeneration.
• The porous microstructure supports cell infiltration and nutrient diffusion.
• High biocompatibility ensures suitability for various soft tissue regeneration applications.
• This technology holds promise for advancing minimally invasive treatments in regenerative medicine.