自制双腔生物反应器构建组织工程骨软骨复合体的体外性能

背景：关节软骨损伤往往并发软骨下骨损伤形成骨软骨复合缺损，其治疗仍为骨科急待解决的问题，利用组织工程学构建骨软骨复合体为治疗该类疾患提供了新思路。 目的：探讨利用自行设计制造的双腔搅拌式生物反应器构建一体化组织工程骨软骨复合体的可行性。 方法：在双腔搅拌式生物反应器内对复合于β-磷酸三钙支架材料的羊骨髓间充质干细胞同时进行成骨和成软骨诱导，并根据施加剪切应力分为动态培养组和静态培养组。利用MTT试验、RT-PCR和扫描电镜检测骨髓间充质干细胞体外增殖和诱导分化情况。 结果与结论：MTT试验和扫描电镜结果显示，骨髓间充质干细胞增殖良好。成骨和成软骨相关基因RT-PCR检测结果表明，骨髓间充质干细胞诱导分化良好，动态培养组要优于静态培养组。提示利用自行设计制作的双腔搅拌式生物反应器进行骨软骨复合体的体外构建是可行的，力学刺激环境下的构建效果要优于静态环境。中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程全文链接：

In vitro fabrication of tissue-engineered osteochondral composite graft in a home-made double-chamber stirring bioreactor

BACKGROUND: Articular cartilage injury is often complicated by subchondral bone damage to form osteochondral defects, and its treatment remains a pressing problem in orthopedics. Osteochondral composite grafts fabricated by tissue engineering technology provide a new way to repair osteochondral defects. OBJECTIVE: To explore the feasibility of fabricating osteochondral composite grafts in an independently designed double-chamber stirring bioreactor. METHODS: Goat bone marrow mesenchymal stem cells were seeded into β-tricalcium phosphate scaffolds. The cell/scaffold constructs were subjected to chondrogenic and osteogenic induction simultaneously in the double-chamber stirring bioreactor. According to the applied shear stress, they were divided into dynamic and static culture groups. The proliferation of bone marrow mesenchymal stem cells was detected by MTT test and scanning electron microscope examination. Osteogenesis and chondrogenesis related genes were detected by RT-PCR for the evaluation of chondrogenic and osteogenic differentiation. RESULTS AND CONCLUSION: The bone marrow mesenchymal stem cells in both dynamic and static culture groups demonstrated satisfactory proliferation and differentiation. Better proliferation and differentiation ability were found in the dynamic culture group. Fabrication of osteochondral composite grafts in the independently.designed double-chamber stirring bioreactor is feasible, which is better under the mechanical stimulus environment than the static environment.