Injectable chitosan hydrogel embedding modified halloysite nanotubes for bone tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Chitosan hydrogels have limitations in mechanical strength and osteoinduction for bone regeneration.
• Developing injectable, mechanically robust, and osteoinductive scaffolds is crucial for bone tissue engineering.

Purpose of the Study:

• To create an injectable chitosan hydrogel with enhanced mechanical properties and osteoinductivity.
• To utilize chitosan-modified halloysite nanotubes (mHNTs) and icariin for improved bone regeneration applications.

Main Methods:

• Synthesized chitosan-modified halloysite nanotubes (mHNTs).
• Loaded icariin into mHNTs to create IC@mHNTs for sustained release.
• Prepared nanocomposite chitosan/mHNTs hydrogels via sol-gel transition.
• Encapsulated mesenchymal stem cells to assess biocompatibility and osteogenic potential.

Main Results:

• The nanocomposite hydrogels exhibited decreased gelation time and temperature with enhanced mechanical strength.
• In vitro assays confirmed the biocompatibility of the scaffolds.
• Encapsulated cells showed enhanced proliferation and bone differentiation when mHNTs or IC@mHNTs were incorporated.

Conclusions:

• The injectable, in situ forming nanocomposite chitosan hydrogel loaded with IC@mHNTs demonstrates significant potential for bone regeneration.
• This approach offers a promising strategy for overcoming the limitations of traditional chitosan hydrogels in bone tissue engineering.