Three-dimensional nanohydroxyapatite/chitosan scaffolds as potential tissue engineered periodontal tissue

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Periodontal tissue engineering requires advanced scaffolds for cell viability and differentiation.
• Developing effective scaffolds is crucial for regenerating damaged periodontal tissues.

Purpose of the Study:

• To prepare and evaluate nanohydroxyapatite/chitosan (HA/chitosan) scaffolds for periodontal tissue engineering.
• To assess the in vitro and in vivo performance of HA/chitosan scaffolds with varying HA ratios.

Main Methods:

• Fabrication of porous HA/chitosan scaffolds using freeze-drying.
• In vitro evaluation of scaffold microstructure, porosity, and cytocompatibility.
• Analysis of type I collagen and alkaline phosphatase (ALP) expression via RT-PCR.
• In vivo subcutaneous implantation of EGFP-transfected human periodontal ligament cells (HPLCs) on scaffolds in athymic mice.

Main Results:

• HA/chitosan scaffolds exhibited reduced porosity and pore diameter compared to pure chitosan.
• The 1% HA/chitosan scaffold demonstrated superior cytocompatibility and up-regulated type I collagen and ALP expression.
• In vivo, EGFP-transfected HPLCs proliferated, recruited surrounding tissue, and showed decreased scaffold degradation with HA presence.

Conclusions:

• HA/chitosan scaffolds show promise as substrates for periodontal tissue engineering.
• The 1% HA/chitosan composition offers a favorable microenvironment for cell growth and tissue regeneration.
• Incorporation of HA enhances scaffold stability and biological performance.