中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (33): 5309-5314.doi: 10.3969/j.issn.2095-4344.0665

• 脂肪干细胞 adipose-derived stem cells • 上一篇    下一篇

骨形态发生蛋白14成骨诱导脂肪间充质干细胞复合丝素蛋白/羟基磷灰石支架修复骨缺损

丁 涛1,汤峰林1,陆 淼1,顾三军2,王建兵2,刘 浩2   

  1. 1无锡市人民医院骨科,江苏省无锡市 214000;2无锡市第九人民医院关节外科,江苏省无锡市 214000
  • 修回日期:2018-07-22 出版日期:2018-11-28 发布日期:2018-11-28
  • 通讯作者: 刘浩,硕士研究生,医师,无锡市第九人民医院关节外科,江苏省无锡市 214000
  • 作者简介:丁涛,男,1978年生,江苏省无锡市人,汉族,2010年苏州大学毕业,博士,副主任医师,主要从事组织工程学、脊柱外科学的基础及临床研究。
  • 基金资助:

    南京医科大学科技发展基金重点项目(2016NJMUZD069)

Bone defect repair with bone morphogenetic protein 14 transfected adipose-derived stem cells seeded onto a silk fibroin/hydroxyapatite scaffold

Ding Tao1, Tang Feng-lin1, Lu Miao1, Gu San-jun2, Wang Jian-bing2, Liu Hao2   

  1. 1Department of Orthopedics, Wuxi People’s Hospital, Wuxi 214000, Jiangsu Province, China; 2Department of Orthopedics, Wuxi 9th People’s Hospital, Wuxi 214000, Jiangsu Province, China
  • Revised:2018-07-22 Online:2018-11-28 Published:2018-11-28
  • Contact: Liu Hao, Master candidate, Physician, Department of Orthopedics, Wuxi 9th People’s Hospital, Wuxi 214000, Jiangsu Province, China
  • About author:Ding Tao, MD, Associate chief physician, Department of Orthopedics, Wuxi People’s Hospital, Wuxi 214000, Jiangsu Province, China
  • Supported by:

    the Scientific Development Foundation of Nanjing Medical University, No. 2016NJMUZD069

摘要:

文章快速阅读:

文题释义:
骨形态发生蛋白14成骨诱导的脂肪间充质干细胞:
构建携带大鼠骨形态发生蛋白14基因的慢病毒过表达载体(LvBMP14)并完成慢病毒包装;将重组慢病毒转染大鼠脂肪间充质干细胞,其本质是向细胞导入特异性的基因,让细胞合成和分泌骨形态发生蛋白14蛋白,诱导其向成骨细胞持续分化。
丝素蛋白/羟基磷灰石支架:由丝素蛋白和羟基磷灰石2种材料复合而成的人工骨支架。组织工程学中,单一材料很难同时满足组织相容性好、孔隙率高、力学强度高、适合细胞黏附等要求,而丝素蛋白和羟基磷灰石二者具有较强的结合力,优势互补,满足组织工程支架材料的条件。

 

摘要
背景:
临床上较大骨缺损往往难以自行修复,而通常采用的自体骨、异体骨移植也逐渐显现出其局限性。目前,组织工程技术的开展可以有望解决这一难题。利用转基因技术对干细胞进行成骨诱导,再将其种植在人工支架材料上体外构建组织工程化骨,为大面积骨缺损的修复带来新的希望。
目的:探讨丝素蛋白/羟基磷灰石支架材料与骨形态发生蛋白14转染脂肪间充质干细胞的生物相容性,并检验二者构建的组织工程化骨用于修复骨缺损的效果。
方法:胶原酶消化法分离培养大鼠脂肪间充质干细胞,第3代细胞使用携带骨形态发生蛋白14基因的重组慢病毒转染,利用荧光显微镜计算转染效率。制备丝素蛋白/羟基磷灰石支架,将转染成功后的脂肪间充质干细胞与丝素蛋白/羟基磷灰石支架材料体外复合,通过扫描电镜和MTT法评估材料对细胞的生物相容性。最后将上述组织工程化骨植入实验组大鼠尾椎缺损处,将空白转染的脂肪间充质干细胞复合支架植入对照组大鼠尾椎缺损处,通过摄片及micro CT检查来评估骨缺损的修复效果。
结果与结论:①骨形态发生蛋白14转染的脂肪间充质干细胞在丝素蛋白/羟基磷灰石支架材料上能够良好地黏附、增殖;②术后8周,实验组骨缺损处密度明显增高,可见大量骨痂形成,骨连续性恢复较好。对照组骨缺损处仍可见未完全吸收的支架材料影,周围无明显新生骨组织,未能将骨缺损处连接;③结果表明,丝素蛋白/羟基磷灰石支架材料对骨形态发生蛋白14转染的脂肪间充质干细胞具有良好的生物相容性,二者复合构建的组织工程化骨可促进骨缺损修复,效果良好。


中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程
ORCID: 0000-0002-4601-8391(丁涛)

关键词: 骨缺损, 脂肪间充质干细胞, 骨形态发生蛋白14, 丝素蛋白, 羟基磷灰石, 干细胞

Abstract:

BACKGROUND: In clinic, large bone defects are often difficult to repair naturally. Traditional methods including autologous and allogeneic bone grafts gradually show their limitations. However, the development of tissue engineering technology is expected to solve this problem. Transgenic technology is used to induce osteogenic induction of stem cells, and then induced cells are seeded onto artificial scaffold materials to construct tissue-engineered bone in vitro, which brings new hope for the repair of large-area bone defects.
OBJECTIVE: To explore the biocompatibility of bone morphogenetic protein 14 (BMP14) transfected adipose-derived stem cells with silk fibroin (SF)/hydroxyapatite (HA) scaffolds and to evaluate the effect on repairing bone defects with this tissue-engineered bone.
METHODS: Rat adipose-derived stem cells were isolated and cultured in vitro using collagenase digestion method. The third passage cells were transfected by lentivirus with BMP14 gene. Transfection efficiency was counted under fluorescent microscope. Meanwhile, the SF/HA scaffolds was prepared. Transfected cells were then seeded onto the SF/HA scaffold to prepare tissue-engineered bone. Biocompatibility of the prepared tissue-engineered bone was tested by scanning electron microscope and MTT method. Afterwards, the prepared tissue-engineered bone was implanted into the defect of the rat caudal vertebra as experimental group, and empty transfected cells with SF/HA scaffolds acted as control group. Remediation effect on bone defects was evaluated by X-ray and micro-CT examination.
RESULTS AND CONCLUSION: BMP14 transfected adipose-derived stem cells adhered to the SF/HA scaffold and grew well. At 8 weeks after surgery, X-ray and micro-CT images showed that bone density of the intervertebral space obviously increased and a large number of calli developed in the experimental group, indicating a better recovery in bone continuity, while in the control group, the scaffold material incompletely absorbed was visible in the bone defect, and no obvious new bone tissues formed to fill in the defect. To conclude, these findings reveal that the SF/HA scaffold has good biocompatibility with BMP 14-transfected adipose-derived stem cells, and the composite artificial bone has good outcomes in the repair of bone defects. 


中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

Key words: Adipose Tissue, Mesenchymal Stem Cells, Bone Morphogenetic Proteins, Silk, Hydroxyapatites, Bone Transplantation, Tissue Engineering

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