Porous crosslinked polycaprolactone hydroxyapatite networks for bone tissue engineering.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Bone tissue engineering requires biocompatible scaffolds with appropriate mechanical properties and osteoconductive potential.
• Polycaprolactone (PCL) is a versatile biodegradable polymer, but its mechanical properties and bioactivity can be enhanced for bone regeneration.
• Hydroxyapatite (HA) is a bioceramic that mimics the mineral component of bone, offering osteoconductive benefits.

Purpose of the Study:

• To fabricate and characterize porous polycaprolactone diacrylate scaffolds incorporating hydroxyapatite (HA) for bone tissue engineering.
• To evaluate the structural, mechanical, and biological properties of the PCL/HA composite scaffolds.
• To assess the cytocompatibility and osteoconductivity of the developed scaffolds.

Main Methods:

• Porous scaffolds were fabricated using thermal crosslinking of polycaprolactone diacrylate and hydroxyapatite, followed by a particulate leaching technique with sodium chloride.
• Scaffold characterization involved Field Emission Scanning Electron Microscopy (FESEM), Differential Scanning Calorimetry (DSC), Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), and Dynamic Mechanical Thermal Analysis (DMTA).
• Cytocompatibility was assessed using MTT assay and cell attachment studies, while osteoconductivity was evaluated by measuring alkaline phosphatase activity.

Main Results:

• The PCL/HA scaffolds exhibited a porous structure with interconnected pores and approximately 73% porosity.
• Incorporation of HA increased the crystallinity of the PCL matrix, leading to enhanced storage modulus (E') and glass transition temperature (Tg).
• The PCL/HA scaffolds showed no toxicity, supported cell attachment and spreading, and demonstrated higher alkaline phosphatase activity compared to pure PCL scaffolds, indicating good osteoconductivity.

Conclusions:

• Porous PCL/HA composite scaffolds can be successfully fabricated for bone tissue engineering applications.
• The addition of HA significantly improves the mechanical properties and thermal stability of PCL scaffolds.
• The PCL/HA scaffolds exhibit excellent cytocompatibility and osteoconductivity, making them promising candidates for promoting bone regeneration.