Related Experiment Video
Updated: Jul 8, 2025
10:19
Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs
Published on: August 8, 2022
1.9K
Tuning Physical Properties of GelMA Hydrogels through Microarchitecture for Engineering Osteoid Tissue
Ewa Walejewska1,2, Ferry P W Melchels3,4, Alessia Paradiso1
1Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland.
Biomacromolecules
|December 16, 2023
Summary
Engineered gelatin methacryloyl (GelMA) hydrogels mimic bone tissue. Dual cross-linking of 5% GelMA supports bone formation, while poly(ethylene) oxide hinders hydrogel fabrication and cell function.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Gelatin methacryloyl (GelMA) hydrogels are widely studied for their biocompatibility and tunable mechanical properties.
- Mimicking the native osteoid matrix is crucial for developing effective bone tissue engineering scaffolds.
- Controlling hydrogel stiffness and porosity is essential for promoting osteogenic differentiation and bone formation.
Purpose of the Study:
- To engineer GelMA-based hydrogel matrices that effectively mimic the osteoid matrix.
- To investigate the impact of different cross-linking strategies and concentrations on hydrogel properties and osteogenic potential.
- To evaluate the role of poly(ethylene) oxide (PEO) incorporation on hydrogel fabrication, cell viability, and osteogenic differentiation.
Main Methods:
- Fabrication of GelMA hydrogels using standard cross-linking (SC) with visible light (VL) and dual cross-linking (DC) involving physical gelation followed by VL.
- Tuning GelMA concentration (10% G10, 5% G5) to achieve specific tissue stiffness.
- Incorporation and subsequent removal of poly(ethylene) oxide (PEO) in GelMA formulations.
- Assessment of compressive modulus, hydrogel porosity, cell survival, and osteogenic differentiation markers (alkaline phosphatase).
Main Results:
- Dual-cross-linked 5% GelMA (G5) hydrogels achieved a compressive modulus of approximately 17 kPa, mimicking bone tissue stiffness.
- The dual-cross-linked G5 hydrogels demonstrated the ability to support bone formation, confirmed by alkaline phosphatase detection over 3 weeks.
- Incorporating PEO into G5 and G10 samples hindered the creation of porous hydrogels, leading to reduced cell survival and osteogenic differentiation due to incomplete PEO removal.
Conclusions:
- Dual cross-linking of reduced GelMA concentration (5%) provides a promising strategy for engineering osteoid-mimicking hydrogels.
- The developed GelMA hydrogels support osteogenic differentiation and bone formation in vitro.
- Poly(ethylene) oxide incorporation negatively impacts hydrogel fabrication and cellular function, highlighting the importance of complete removal for successful scaffold design.
