骨髓基质细胞复合人脱细胞骨的成骨活性

背景:寻找一种既保持支持功能良好又具有一定成骨活性的同种异体骨是治疗骨缺损的重要研究课题。以往曾对比测定脱细胞骨的生物力学性质,发现其与正常大小的新鲜骨质在最大抗压力,压强方面无显著性差异。人脱细胞骨复合骨髓基质细胞后的成骨活性如何,是否能够保持成骨的活性是临床医生非常关心的问题。目的:研究人脱细胞骨复合经诱导的骨髓基质细胞的实验效果,观察细胞的黏附和生长情况,并对其成骨活性进行检测。设计:单一样本实验。单位:哈尔滨医科大学附属第二医院。材料:实验于2003-01/2004-08在哈尔滨医科大学附属第二医院实验中心完成。脱细胞骨(取新鲜尸体髂骨块,自愿捐献)。方法:用过氧化氢和乙醚去除人髂骨块内的结缔组织和细胞成分,消毒后制备人脱细胞骨。取材活体或新鲜尸体的骨髓行骨髓基质细胞培养,细胞纯化后加入β-甘油酸钠,地塞米松和抗坏血酸等向成骨方向诱导,并进行对照培养。通过碱性磷酸酶和骨钙素检测来确定骨髓基质细胞的增殖和分化情况,将诱导的骨髓基质细胞浓缩后复合到制备好的脱细胞骨块内进行培养。8d后通过光镜和电镜等形态学观察以及生化指标检测来确定细胞的成骨活性。主要观察指标:①人骨髓基质细胞/脱细胞骨复合物碱性磷酸酶和骨钙素检测结果。②人骨髓基质细胞/脱细胞骨复合物组织学观察结果。结果:①人髂骨块细胞清除干净,骨基质保存良好。②诱导8d后的骨髓基质细胞碱性磷酸酶和骨钙素含量明显高于对照组[诱导后骨髓基质细胞:(181.54±40.01)nkat/L,(7.2±1.3)μg/L,对照组:无法测到,P<0.05]。③骨髓基质细胞在人脱细胞骨支架内附着紧密,生长良好。结论:人脱细胞骨复合经诱导的骨髓基质细胞在体外具有有效的成骨功能,是一种较为理想的骨组织工程材料。

Osteogenic function of human acellular bone loaded with bone marrow stromal cells

BACKGROUND: To search for an alloxenogeneic bone with good load bearing function and osteoblastic activity for treating bone defects is an important study issue. We have made a comparative study on its biome chanical characteristics and found that there was no significant difference in maximum load stress, maximum pressure as compared with fresh bone of the same size. Clinicians are concerned about the osteoblastic activity and whether the osteoblastic activity can be reserved after human allogenous a cellular bone (HAB) loaded with bone marrow stromal cells (BMSCs). OBJECTIVE: To investigate the experimental effect of HAB loaded with induced BMSCs, and observe the cellular adherence and growth as well as detect its osteoblastic activity. DESIGN: Single sample experiment. SETTING: Second Affiliated Hospital of Harbin Medical University. MATERIALS: This experiment was conducted at the Experimental Center of the Second Affiliated Hospital of Harbin Medical University between January 2003 and August 2004. HAB was obtained from fresh corpse iliac bones (donated voluntarily). METHODS: Connective tissues and cell compounds of the iliac bones were removed by processing with hydroperoxide andether solution and sterilized for preparing HAB. BMSCs from living femoral shaft bone marrow were cultured immediately in ordinary and mineralized medium containing DMEM, fetal bovine serum, dexomethasone, β-glycerophophate and ascor bic acid. Proliferation and differentiation of bone stromal cells were deter mined by detecting the level of alkaline phosphatase (ALP) and osteocalcin (OCN) in the culture medium. Induced bone stromal cells solution was condensed and implanted within HAB scaffold. Cellular osteoblastic activ ity was determined through morphological observation under the light mi croscope and electron microscope as well as biochemical index detection. MAIN OUTCOME MEASURES: ① Detection results of ALP and OCN of BMSCs/HAB composite. ② Histological observation results of BMSCs/ HAB composite. RESULTS: ① Iliac bone block cells were cleaned with good reservation of bone matrix. ② The level of ALP and OCN of MSCs was higher after in ducing for 8 days than that in control group [MSCs after induction: (181.54±40.01) nkat/L, (7.2±1.3) μg/L. There was no method to detect the level in control group, P ＜ 0.05]. ③ BMSCs were adhered and grew well in HAB scaffold. CONCLUSION: HAB loaded with induced BMSCs has an excellent os teogenic function in vitro and shows an effective potential as a good bone tissue engineering material.