Chondroinductive Alginate-Based Hydrogels Having Graphene Oxide for 3D Printed Scaffold Fabrication

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Bioconjugated hydrogels mimic native tissues but often have poor processability for 3D printing.
• Tailor-made scaffolds are crucial for tissue engineering applications, particularly for cartilage repair.
• Improving hydrogel inks' printability and bioactivity is essential for advanced scaffold fabrication.

Purpose of the Study:

• To develop bioconjugated hydrogel nanocomposite inks for 3D printing.
• To enhance scaffold biocompatibility and processability using micro-extrusion.
• To create scaffolds mimicking the cartilage extracellular matrix with improved cell proliferation and differentiation.

Main Methods:

• Photocrosslinkable alginate was conjugated with gelatin and chondroitin sulfate.
• Graphene oxide was incorporated as a nanofiller to create nanocomposite inks.
• Micro-extrusion 3D printing was used to fabricate scaffolds, followed by in vitro cell assays (proliferation, viability, differentiation).

Main Results:

• Graphene oxide incorporation improved scaffold shape fidelity and resolution due to faster viscosity recovery.
• Nanocomposite inks produced anisotropic threads, guiding cell proliferation directionally.
• Bioconjugated scaffolds enhanced human adipose tissue-derived mesenchymal stem cell (hADMSC) proliferation and viability.
• Scaffolds induced chondrogenic differentiation of hADMSCs without external factors.

Conclusions:

• The developed nanocomposite hydrogel inks offer superior printability and biocompatibility for 3D scaffold fabrication.
• The anisotropic structures and chondroinductive properties make them highly suitable for cartilage tissue engineering.
• These advanced inks represent a promising platform for creating functional tissue constructs.