Gold and Hydroxyapatite Nano-Composite Scaffolds for Anterior Cruciate Ligament Reconstruction: In Vitro...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Current anterior cruciate ligament (ACL) graft materials lack biological integration, hindering functional recovery.
• Extracellular matrix scaffolds show biocompatibility but limited cellular remodeling.
• Novel strategies are needed to improve scaffold integration and ligament regeneration.

Purpose of the Study:

• To investigate the double conjugation of gold nanoparticles (AuNP) and hydroxyapatite nanoparticles (nano-HAp) onto decellularized tissue.
• To enhance cell attachment, proliferation, and tissue remodeling for ACL graft replacements.
• To improve scaffold degradation resistance and maintain an open microstructure.

Main Methods:

• Decellularized porcine diaphragm was crosslinked with two types of nano-HAp and amine-functionalized AuNP using EDC.
• Scaffolds were characterized using electron microscopy, differential scanning calorimetry, and fibroblast assays.
• Cell viability and proliferation were assessed on modified scaffolds.

Main Results:

• Nano-HAp addition increased scaffold thermal stability without compromising microstructure.
• Scaffolds demonstrated increased degradation resistance and maintained porosity for cell migration.
• AuNP addition enhanced cell viability, particularly with < 40 nm nano-HAp, while < 200 nm nano-HAp alone decreased viability.

Conclusions:

• Double conjugation of AuNP and < 40 nm nano-HAp to extracellular matrices shows promise for improving ACL scaffold properties.
• This approach may enhance cellular response and tissue remodeling for functional ligament regeneration.
• Optimized nanoparticle conjugation offers a potential strategy for advanced ACL graft materials.