The microstructure of antigen-extracted heterologous bone
10.3969/j.issn.2095-4344.2013.42.001
- VernacularTitle:去抗原羊椎松质骨支架微观空间结构的分析
- Author:
Jie CUI
;
Zheng LI
;
Huiyu HE
;
Yang HU
- Publication Type:Journal Article
- Keywords:
antigens;
stents;
tissue engineering;
spine
- From:
Chinese Journal of Tissue Engineering Research
2013;(42):7341-7348
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:Different methods to remove immunogenicity have different effects on the spatial microstructure of antigen-extracted heterologous bone.
OBJECTIVE:To compare the microstructure of the antigen-extracted heterologous bone via different methods to provide experimental data for tissue engineering industrialization.
METHODS:Fresh cancellous bones extracted from adult sheep vertebrae were prepared into cylinders. Their long axis direction was the same with orientation of the trabeculae. After vibration washing and different-frequency ultrasound rinsing, the cylinder samples were randomly divided into three groups:in physical calcined group, the samples were defatted, decellularized and deproteinized sequential y using methanol/chloroform and hydrogen peroxide, then bathed in sodium pyrophosphate and directly calcined at 1 000 ℃ for 3 hours;in chemical group, the samples were defatted, decellularized and deproteinized sequential y using methanol/chloroform and hydrogen peroxide;in control group, the samples were dried natural y at room temperature. Microstructure of the samples in each group was analyzed and compared through determination of porosity, scanning electron microscopy observation, X-ray diffraction analysis, X-ray atomic spectroscopy elemental analysis microscopic spatial structure.
RESULTS AND CONCLUSION:The physical calcined and chemical groups maintained natural network pore system to different extents. The size of the large pore was 50-600μm and that of the smal one was about 2μm. The porosity was 55%to 70%. Hydroxyapatite was the main component of the physical calcined group which was determined by X-ray diffraction, and a smal amount of theβ-Tricalcium phosphate was also determined. In the chemical group, the main component was only hydroxyapatite. The three-dimensional spatial structures of the deproteinized cancellous bones were not damaged greatly, and they had a natural pore network system. Antigen component of xenogeneic cancellous bone can be more thoroughly removed by physical calcination step. The scaffold material made by antigen-extracted heterologous bone may satisfy the demands for bone tissue-engineering scaffolds.
