Mineralized Polyamide66/Calcium Chloride Nanofibers for Bone Tissue Engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Science

Background:

• Designing materials that mimic the native extracellular matrix (ECM) is crucial for effective bone tissue engineering.
• Polyamide66 (PA66) is a potential scaffold material, but its native properties may require modification for optimal bone regeneration.
• Incorporating calcium chloride (CaCl2) into PA66 nanofibers offers a strategy to enhance scaffold properties and biomimicry.

Purpose of the Study:

• To develop and characterize novel electrospun PA66/CaCl2 nanofibers for bone tissue engineering.
• To investigate the effect of CaCl2 incorporation on the structural, mechanical, and biological properties of PA66 scaffolds.
• To evaluate the potential of these modified scaffolds for promoting bone regeneration by assessing cell behavior and mineralization.

Main Methods:

• Fabrication of PA66/CaCl2 and pure PA66 electrospun nanofibers using the electrospinning technique.
• Characterization of scaffold properties using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy.
• Assessment of mechanical properties (tensile strength, modulus) and in vitro cytocompatibility using LIVE/DEAD assays and Cell Counting Kit-8 (CCK-8) on MC3T3-E1 cells.

Main Results:

• Addition of CaCl2 to PA66 solution resulted in internal modification, significantly improving the tensile strength and modulus of the electrospun nanofibers.
• The Ca2+ ions within the HA/PA66/CaCl2 scaffolds served as nucleation sites for hydroxylapatite (HA) coating, enhancing biomimicry.
• Mineralized HA/PA66/CaCl2 scaffolds demonstrated superior mechanical properties and significantly enhanced proliferation and growth of MC3T3-E1 cells compared to pure PA66 scaffolds.

Conclusions:

• The developed HA/PA66/CaCl2 electrospun scaffolds structurally and chemically resemble native bone ECM.
• These scaffolds exhibit excellent cytocompatibility and promote osteogenic cell proliferation and growth.
• The findings suggest that mineralized PA66/CaCl2 electrospun scaffolds are a promising candidate material for future bone tissue engineering applications.