PCL-HA microscaffolds for in vitro modular bone tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Modular bone tissue engineering requires advanced biomaterials for scaffold fabrication.
• Developing bioactive surfaces is crucial for enhancing cell-material interactions and osteogenesis.
• Polycaprolactone (PCL) and hydroxyapatite (HA) are key components in bone regeneration research.

Purpose of the Study:

• To design and fabricate porous PCL microscaffolds functionalized with HA nanoparticles.
• To investigate the capacity of these nanocomposite microscaffolds to support human mesenchymal stem cell (hMSC) adhesion, proliferation, and osteogenic differentiation.
• To evaluate the potential of PCL-HA microscaffolds as a platform for modular bone tissue engineering.

Main Methods:

• Fabrication of PCL-HA nanocomposite microscaffolds using thermally-induced phase separation.
• Culture of hMSCs on microscaffolds under dynamic seeding and culture conditions in standard and osteogenic media.
• Assessment of cell adhesion, proliferation, and osteogenic differentiation through assays including calcium deposition, alizarin red staining, gene expression analysis, and collagen I secretion.

Main Results:

• The PCL-HA nanocomposite microscaffolds demonstrated enhanced interaction with hMSCs.
• Osteogenic differentiation of hMSCs was induced by the microscaffolds, even without exogenous osteogenic factors.
• Formation of bone microtissue precursors was observed after 28 days of dynamic culture, evidenced by calcium deposition, gene expression, and collagen I secretion.

Conclusions:

• PCL-HA nanocomposite microparticles are a promising biomaterial for bone tissue engineering applications.
• These microparticles facilitate hMSC osteogenic differentiation and bone microtissue formation in vitro.
• The developed microscaffolds represent an excellent platform for modular bone tissue engineering strategies.