Biomineralized hydroxyapatite nanoclay composite scaffolds with polycaprolactone for stem cell-based bone tissue...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Biomimetic approaches are crucial for developing effective bone regeneration materials.
• Hydroxyapatite (HAP) and nanoclay hybrids offer potential for mimicking natural bone structure.
• Polycaprolactone (PCL) is a widely used biodegradable polymer in tissue engineering.

Purpose of the Study:

• To design and fabricate a novel nanoclay-hydroxyapatite (HAP) hybrid material.
• To create polycaprolactone (PCL)/in situ HAPclay composites for bone regeneration applications.
• To evaluate the biocompatibility and bone-forming potential of these composites with human mesenchymal stem cells (hMSCs).

Main Methods:

• Fabrication of nanoclay-hydroxyapatite (HAP) hybrid via biomineralization within nanoclay galleries.
• Preparation of polycaprolactone (PCL)/in situ HAPclay composite films and scaffolds.
• In vitro cell culture assays using hMSCs.
• Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) for imaging cellular interactions and extracellular matrix (ECM) formation.
• Nanomechanical property testing and degradation studies.

Main Results:

• SEM confirmed hMSC attachment, ECM mineralization, and cell infiltration into scaffolds.
• AFM revealed hierarchical organization of collagen and mineral in the in vitro ECM, mimicking natural bone.
• hMSCs formed mineralized ECM without osteogenic supplements.
• PCL/in situ HAPclay films exhibited significantly enhanced nanomechanical properties (100-595% increase in elastic moduli).
• PCL/in situ HAPclay scaffolds showed increased degradation rates.

Conclusions:

• The developed PCL/in situ HAPclay composites are viable biomaterials for bone tissue engineering.
• The biomimetic design facilitates cell interaction, ECM formation, and mechanical enhancement.
• This approach holds promise for advancing bone regeneration therapies.