Functionalized mesoporous bioactive glass scaffolds for enhanced bone tissue regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Materials Engineering

Background:

• Mesoporous bioactive glass (MBG) is crucial for bone regeneration due to its bioactivity and osteoconductivity.
• Fabricating MBG scaffolds with sufficient compressive strength for bone regeneration remains a significant challenge.
• Existing methods for MBG scaffold fabrication often struggle to balance mechanical properties with biological performance.

Purpose of the Study:

• To develop a novel mesoporous bioactive glass scaffold (MBGS) with improved mechanical properties.
• To functionalize MBGS with amino (N-MBGS) and carboxylic (C-MBGS) groups to enhance biological performance.
• To evaluate the in vitro and in vivo efficacy of MBGS and functionalized MBGSs for bone regeneration.

Main Methods:

• A simple powder processing technique was employed to fabricate MBGS scaffolds.
• Post-grafting was used to introduce amino and carboxylic groups onto the MBGS surface, creating N-MBGS and C-MBGS.
• In vitro studies assessed the proliferation and osteogenic differentiation of bone marrow stem cells (bMSCs).
• In vivo studies evaluated the bone regeneration capacity of the scaffolds in animal models.

Main Results:

• Both MBGS and functionalized MBGSs significantly promoted bMSC proliferation and osteogenic differentiation.
• N-MBGS exhibited the highest in vitro osteogenic capability due to its positively charged surface.
• In vivo results showed that N-MBGS significantly enhanced bone regeneration compared to MBGS and C-MBGS.
• The decreased degradation rate of N-MBGS was identified as a key factor in promoting bone regeneration.

Conclusions:

• A powder processing technique combined with post-grafting is effective for fabricating functionalized MBGSs.
• N-MBGS demonstrates superior performance in promoting bone regeneration compared to unmodified MBGS and C-MBGS.
• These findings suggest that MBGSs, particularly N-MBGS, are promising materials for bone tissue engineering applications.