珍珠层聚乳酸人工骨复合成骨细胞体内异位成骨研究

目的探讨珍珠层聚乳酸(nacre／polylactic acid，N／P)人工骨与同种异体成骨细胞复合，植入体内后异位成骨的作用机制，以及作为骨组织工程支架材料的可行性。方法成年雄性新西兰大白兔18只，按2、4和8周3个时间点随机分成3组，每组6只。将体外培养的同种异体新西兰大白兔成骨细胞，种植到N／P人工骨材料上，并植入每只兔左侧背部皮下为实验组；以不复合成骨细胞的N／P人工骨材料植入右侧背部皮下作对照，分别于植入后不同时间点取材，经大体观察、组织学检查和免疫组织化学方法检测。结果实验组2周时材料周围有少许炎性细胞聚集，4周时有类骨质形成，8周时有成熟骨组织形成，其中可见骨髓腔；对照组2、4周时仅见大量纤维组织长入材料内，8周时材料内纤维组织增多，但无成骨发生。结论N／P人工骨可作为理想的骨组织工程支架材料。

IN VIVO ECTOPIC OSTEOGENESIS OF NACRE/POLYLACTIC ACID ARTIFICIAL BONE COMBINED WITH ALLOGENIC OSTEOBLASTS

Objective To study the mechanism of ectopic osteogenesis of nacre/Polylactic acid (N/P) artificial bone combined with allogenic osteoblasts, and to explore the possibility as a scaffold material of bone tissue engineering. a(c)Methods The allogenic osteoblasts seeded onto N/P artificial bone were co cultured in vivo 1 week. The N/P artificial bone with allogenic osteoblasts were implanted subcutaneously into the left back sites of the New Zealand white rabbits in the experimental group and the simple N/P artificial bone into the right ones in the control group. The complexes were harvested and examined by gross observation, histologic analysis and immunohistochemical investigation 2, 4 and 8 weeks after implantation respectively. Results In experimental group, the osteoid formed after 4 weeks, and the mature bone tissue with bone medullary cavities formed after 8 weeks; but in control group there was no new bone formation instead of abundant fibrous tissue after 4 weeks, and more fibrous tissue after 8 weeks. Conclusion N/P artificial bone can be used as an optical scaffold material of bone tissue engineering. ?3/4