A Porous Gelatin Methacrylate-Based Material for 3D Cell-Laden Constructs

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Bioprinting

Background:

• 3D constructs are crucial for tissue engineering and cancer modeling.
• Gelatin methacrylate (GelMA) hydrogels offer good printability but have restrictive micropores affecting cell shape.
• A need exists for tailored biomaterials that support physiological cell behavior within bioprinted constructs.

Purpose of the Study:

• To develop a modified GelMA hydrogel with enhanced porosity for improved cell culture microenvironments.
• To investigate the impact of blending GelMA with Pluronic F-127 (PLU) on hydrogel properties and cell behavior.
• To demonstrate the utility of these tailored porous materials in bioprinting complex 3D cell-laden constructs.

Main Methods:

• Blending GelMA with Pluronic F-127 (PLU) to create hydrogels with modified porosity.
• Characterizing the physical properties of the blended hydrogels, including swelling and mechanical properties (Young's modulus).
• Bioprinting complex 3D structures and casting hydrogels in molds, assessing cell viability and morphology (Neuroblastoma and Mesenchymal Stem Cells).

Main Results:

• The GelMA-PLU blends formed stable hydrogels with increased porosity, swelling, and slightly reduced Young's modulus.
• Bioprinted and cast constructs maintained high cell viability.
• Neuroblastoma cells aggregated within mesopores, while Mesenchymal Stem Cells exhibited 3D stretching and formed cell-cell and cell-extracellular matrix interactions.

Conclusions:

• Blending GelMA with PLU effectively creates porous hydrogels suitable for bioprinting.
• The enhanced porosity supports improved cell morphology and interactions, crucial for in vitro models.
• This approach enables control over both micro and macro architectures of cell-laden constructs for clinical applications.