A bone replaceable artificial bone substitute: cytotoxicity, cell adhesion, proliferation, and alkaline phosphatase...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biomineralization

Background:

• Developing effective artificial bone substitutes is crucial for bone defect repair.
• Carbonate apatite (CAp) and Type I atelocollagen (AtCol) are promising components for bone regeneration.
• Optimizing the processing of CAp-AtCol composites is essential for enhancing their biological performance.

Purpose of the Study:

• To evaluate the cytocompatibility, osteoblast adhesion, proliferation, and alkaline phosphatase (ALP) activity of CAp-AtCol bone substitutes.
• To investigate the effect of different heating temperatures (980°C vs. 1,200°C) on the properties of CAp-AtCol composites.
• To determine the optimal processing conditions for CAp-AtCol bone substitutes for enhanced bone regeneration.

Main Methods:

• Fabrication of CAp-AtCol (88/12 %wt/wt) bone substitutes.
• Crosslinking of AtCol via UV irradiation or vacuum drying.
• Cytotoxicity assessment using direct contact and extract dilution methods with balb 3T3 fibroblasts.
• Evaluation of osteoblast adhesion, proliferation, and ALP activity on substitutes with CAp heated at 980°C and 1,200°C.

Main Results:

• CAp-AtCol substitutes demonstrated cytocompatibility with balb 3T3 fibroblasts.
• Substitutes with 980°C-heated CAp showed significantly higher osteoblast adhesion compared to 1,200°C-sintered CAp (p < 0.05).
• Osteoblast proliferation was significantly greater on 980°C-heated CAp-AtCol substitutes after 5 days (p < 0.05), with comparable ALP activity to controls.

Conclusions:

• The 980°C heating temperature for CAp in CAp-AtCol composites promotes superior osteoblast adhesion and proliferation.
• These findings suggest that CAp-AtCol substitutes processed at 980°C offer more favorable biological interactions for bone regeneration.
• Optimized processing of CAp-AtCol materials is key to developing effective bone substitutes.