应用骨髓基质细胞片层构建组织工程骨的实验研究

目的 应用犬骨髓基质细胞片层构建组织工程骨,为临床提供组织工程骨来源.方法 分离培养传代犬骨髓基质细胞(bone marrow stromal cell,BMSC).将经成骨诱导的第3代BMSC接种于温度反应性培养皿中,制备BMSC细胞片层.制备犬同种异体脱钙骨基质(decalcification bone matrixes,DBM).实验用16只犬分为4组,每组4只,采用自身对照.将复合体BMSC片层-人重组骨形态生成蛋白2( rhBMP-2) -BMSC-DBM植入犬左侧背阔肌肌筋膜下为实验侧,同法右侧植入DBM-rhBMP-2-BMSC为对照侧.术后4、8、12、16周取材行组织学观察,评价体内异位成骨的情况.结果 实验侧成骨优于对照侧,成骨面积实验侧＞对照侧,两侧差异有统计学意义(P＜0.05).术后16周,实验侧板层骨连接成片,可见骨单位,骨髓腔内可见红骨髓.结论 BMSC细胞片层可促进功能性组织工程骨的形成.

Construction of tissue engineering bone with bone marrow stromal cell sheets

Objective To construct tissue engineering bone with bone marrow stromal cell(BMSC)sheets of dogs.Methods BMSC were derived from dog bone marrow and cell sheets were prepared with temperature-responsive dishes after the cells were induced by osteogenesis.Allogeneic dogs decalcification bone matrixes(DBM) were prepared.Sixteen dogs were divided into 4 groups.The MSC cell sheets-rhBMP2-BMSC-DBM were implanted under the left latissimus dorsi myofascial as the experimental side; while the thBMP-2-BMSC-DBM were implanted in the right side as the control.Ectopic bone formation in vivo was evaluated by histological examination 4,8,12,16 weeks after operation.Results The osteogenesis in the experimental group was better than that in the control group.New bone area in the experimental side was larger than that in the control group,and the difference was significant ( P ＜ 0.05 ).After 16 weeks,lamellar bone was connected into a film in the experimental group.Haversian system and red bone marrow could be seen.Conclusions BMSC cell sheets could promote the bone formation of functional tissueengineered bone.