3-Dimensional cell-laden nano-hydroxyapatite/protein hydrogels for bone regeneration applications

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Protein-based hydrogels are limited to soft tissue engineering due to poor mechanical strength.
• Hard tissue regeneration requires materials with enhanced mechanical properties and bioactivity.

Purpose of the Study:

• To improve the mechanical properties and osteoconductivity of photocrosslinkable gelatin hydrogels.
• To develop a composite material suitable for hard tissue regeneration and cell encapsulation.

Main Methods:

• Incorporation of bioactive nano-hydroxyapatite (HAp) into a photocrosslinkable gelatin hydrogel.
• Encapsulation of different cell types within the resulting hydrogel nanocomposites.
• Assessment of mechanical properties, structural integrity, swelling ratio, bioactivity, and cellular response.

Main Results:

• Nano-hydroxyapatite (HAp) significantly enhanced the stiffness of gelatin hydrogels while maintaining structural integrity and swelling ratio.
• The nanocomposites exhibited homogeneous 3D mineralization after incubation in simulated body fluid, indicating osteoconductivity.
• Encapsulated cells elongated, proliferated, and formed a 3D interconnected network, demonstrating suitability for cellular growth.

Conclusions:

• The developed nano-HAp/gelatin hydrogel nanocomposites offer enhanced stiffness and osteoconductivity.
• These materials show promise for creating cell-laden tissue-like structures for bone regeneration.
• The study highlights the potential of these nanocomposites for hard tissue engineering applications.