多孔钽棒表面犬骨髓间充质干细胞的附着与增殖

背景：具有高孔隙率及与骨小梁高度相似弹性模量的多孔钽棒,不仅可为股骨头提供有效机械支撑,还可在坏死区域增强再血管化,降低应力遮挡,为骨长入坏死区提供保证。 目的：为评价多孔钽棒的细胞相容性,观察犬骨髓间充质干细胞在多孔钽棒表面的附着与增殖。 方法：采用密度梯度离心法分离培养犬骨髓间充质干细胞,鉴定后取第3代细胞,以1.5×109 L-1的细胞浓度种植在多孔钽棒表面,联合培养5,10,15 d,分别采用倒置显微镜和扫描电镜观察细胞的附着与增殖情况。 结果与结论：①倒置显微镜：1-5 d 培养期内骨髓间充质干细胞开始增殖,材料近周细胞量少,远周细胞量较多;6-10 d 细胞明显增多并逐渐向材料移行,部分细胞贴附于材料边缘;14 d以后细胞连接成片,填充材料周边及凹陷,材料边缘部分区域还可见细胞层叠成团,出现细胞钙化灶。②扫描电镜：联合培养5 d,钽棒表面无细胞附着;联合培养10 d,细胞形态多样,分散在钽棒表面,细胞间无连接,有多个突起;联合培养15 d,细胞呈多角形,数量增多,连接成片,延展良好,可见多孔钽棒上的细胞分泌大量胶原纤维,细胞被大量细胞外基质包围,细胞形态多为梭形及多角形。结果表明犬骨髓间充质干细胞在钽棒表面有较好的黏附与增殖能力。

Attachment and proliferation of bone marrow mesenchymal stem cells cultured on porous tantalum rod

BACKGROUND:Porous tantalum rods, possessing high porosity and highly similar elastic modulus to the trabecular bone, not only can provide effective mechanical support for the femoral head, but also can enhance revascularization in the areas of necrosis, reduce stress shielding, and provide guarantee for bone ingrowth in necrotic area. OBJECTIVE:To investigate the attachment and proliferation of bone marrow mesenchymal stem cells on the surface of porous tantalum rod. METHODS:The purified bone marrow mesenchymal stem cells which were separated from canines were seeded on the surface of porous tantalum rod by the cell density of 1.5×109/L. Cell attachment and proliferation was observed under phase microscope and scanning electron microscope at 5, 10 and 15 days under co-cultured condition. RESULTS AND CONCLUSION:(1) Inverted microscope: Within 1-5 days after co-culture, the cells began to proliferate, and less cells were found near the tantalum rod, but more cells far from the rod. At 6-10 days after co-culture, the cells increased significantly and gradually migrated to the rod, and even some cells attached to the edges of the rod. After 14 days, the cells were interconnected to form a film, packing the surrounding and dents of the tantalum rod. Cells were visible to agglomerate and cell calcification occurred. (2) Scanning electron microscope: At 5 days after co-culture, no cell adhesion appeared on the the tantalum rod surface. At 10 days after co-culture, the cells scattered on the surface of tantalum rod, but there was no interconnection between them. After 15 days, cells were polygon shaped and connected into pieces. It could be seen that the cells secreted large amounts of collagen fibers, and the cells that were fusiform and polygon shaped were surrounded by a great amount of extracellular matrice. Bone marrow mesenchymal stem cells appear to have good adhesion and proliferation capability on the surface of tantalum rod.