仿生髓核组织工程细胞支架的构建及初步理化指标分析

A novel and bionic scaffold of nucleus pulposus tissue engineering

目的设计构建一种新型仿生髓核组织工程的细胞支架,以用于髓核组织工程的实验研究.方法以猪Ⅱ型胶原和透明质酸在pH 1～2的环境下混合,先行制备Ⅱ型胶原/透明质酸海绵,再以水溶性碳化二亚胺交联并复合6-硫酸软骨素,从而获得与生理条件下髓核细胞外基质主要成份相同的仿生髓核组织工程细胞支架.并对其理化指标进行初步分析.结果所制备的支架材料为多孔结构,其孔径为89～132μm,孔隙率为94.8%.含水能力为79.2%,热变性温度为74.6℃,糖胺多糖含量为224.6 mg/g,弹性模量为0.673 MPa.结论我们对所制备支架材料的理化指标初步分析认为:该支架符合理想支架材料的结构要求.可对该支架的性能进行深入的研究.

Objective To design and construct a new bionic scaffold of nucleus pulposus tissue engineering. Methods The collagen-hyaluronic acid (HyA) matrices were prepared, and mixed with Collagen type Ⅱ (pH 1-2) and lyophilized. 6-chondroitin sulfate (CS) was covalently attached to collagen using 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide (EDC) and N-hydroxysuccinimide (NHS). Afterwards the initial structure of bionic scaffolds was evaluated. Results The bionic scaffolds were porous structure, of which the pore size was 89-132 μm, the porosity was 94.8%. Water-binding capacity of resulting matrices was 79.2%, and the denaturation temperature was 74.6 ℃. Glycosaminoglycan (GAG) content was 224 mg/g, and the elastic modulus was 0.673 MPa. Conclusion Composition and tissue structure between the scaffolds are similar to the extracellular matrices of nucleus pulposus. The bionic scaffold is an ideal scaffold material of nucleus pulposus tissue engineering in structure. Further experiment is required on the biocompatibility of the novel scaffolds.