中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (2): 210-215.doi: 10.3969/j.issn.2095-4344.0008

• 药物控释材料 drug delivery materials • 上一篇    下一篇

不同粒径重组人骨形态发生蛋白2/聚乳酸-聚羟基乙酸共聚物微球制备及体内外释放性能比较

鲍玉成1,王  勇1,张文龙1,谢  祎1,于美丽2 
  

  1. 1天津市海河医院,天津市  300350;2天津市第三中心医院,天津市人工细胞重点实验室,天津市  300170
  • 收稿日期:2017-08-01 出版日期:2018-01-18 发布日期:2018-01-18
  • 通讯作者: 王勇,正高级工程师,天津市海河医院,天津市 300350 于美丽,研究员,天津市第三中心医院,天津市人工细胞重点实验室,天津市 300170
  • 作者简介:鲍玉成,男,1975年生,天津市人,汉族,副主任医师,主要从事骨结核、骨组织工程研究。
  • 基金资助:
    天津市津南科委科技基金(2015001) 

Recombinant human bone morphogenetic protein 2/poly(lactic-co-glycolic acid) copolymer microspheres with different particle sizes: preparation and release performance in vivo and in vitro  

Bao Yu-cheng1, Wang Yong1, Zhang Wen-long1, Xie Yi1, Yu Mei-li2
  

  1. 1Tianjin Haihe Hospital, Tianjin 300350, China; 2Third Central Hospital of Tianjin, Tianjin Key Laboratory of Artificial Cells, Tianjin 300170, China
  • Received:2017-08-01 Online:2018-01-18 Published:2018-01-18
  • Contact: Wang Yong, Senior engineer, Tianjin Haihe Hospital, Tianjin 300350, China Yu Mei-li, Researcher, Third Central Hospital of Tianjin, Tianjin Key Laboratory of Artificial Cells, Tianjin 300170, China
  • About author:Bao Yu-cheng, Associate chief physician, Tianjin Haihe Hospital, Tianjin 300350, China
  • Supported by:
     Jinnan Science and Technology Foundation of Tianjin, No. 2015001

摘要:

文章快速阅读:

 

文题释义:
重组人骨形态发生蛋白2:是存在于人、动物骨骼和牙齿等组织中的一种蛋白质,能诱导间充质细胞分化为骨细胞形成新骨,是骨组织形成过程中最关键的一个调节因子。如果单独在缺损区局部应用重组人骨形态发生蛋白2 细胞生长因子,因其半衰期非常短,易被体液转运或酶类降解,不能充分有效发挥其成骨诱导活性。
聚乳酸-聚羟基乙酸共聚物:由乳酸和乙醇酸聚合而成,在体内经过三羧酸循环最终降解为二氧化碳和水。聚乳酸-聚羟基乙酸共聚物具有无毒安全、生物相容性好、易于骨细胞黏附生长及降解性能可控等优点,是制备缓释微球的理想材料,已被美国FDA批准临床应用,近年来被大量应用于控制降解释放的载体材料。
 
背景:应用生物可降解材料包载骨细胞生长因子制成微球缓释的技术,为生长因子的高效利用提供了可行性。
目的:制备重组人骨形态发生蛋白2/聚乳酸-聚羟基乙酸共聚物纳米和微米微球,通过体内外释放实验比较两种微球的释放行为差异。
方法:通过控制匀浆速度,采用乳化-溶剂挥发法制备重组人骨形态发生蛋白2/聚乳酸-聚羟基乙酸共聚物缓释纳米和微米微球。①体外缓释实验:将两种微球分别溶于PBS中70 d,采用ELISA法检测不同时间点上清液中重组人骨形态发生蛋白2的浓度;②体内缓释实验:将44只新西兰大白兔分为2组,分别在股骨转子缺损处植入重组人骨形态发生蛋白2/聚乳酸-聚羟基乙酸共聚物缓释纳米和微米微球,植入70 d内采用ELISA法检测股骨转子缺损处重组人骨形态发生蛋白2的浓度。
结果与结论:①体外缓释实验:纳米微球前3 d存在突释情况,累计释放将近达到41%,随后呈持续平稳缓慢释放,70 d时达到83%左右;微米微球突释情况较纳米微球小,前3 d累计释放约为20%且持续释放时间长,70 d累计释放约为70%;②体内缓释实验:纳米微球前3 d存在突释情况,累计释放将近35%,随后呈持续平稳缓慢释放,70 d时达到72%左右;微米微球突释情况较纳米微球小,前3 d累计释放约为21%且持续释放时间长,70 d累计释放约为63%左右;③结果表明:重组人骨形态发生蛋白2/聚乳酸-聚羟基乙酸共聚物微米微球缓释释放时间与骨生长周期相适宜,更有利于临床治疗骨缺损修复。

关键词: 生物材料, 重组人骨形态发生蛋白2, 生物可降解材料, 聚乳酸-聚羟基乙酸共聚物(PLGA), 纳米微球, 微米微球, 药物释放, 成骨诱导活性, 骨缺损修复, 骨组织工程

Abstract:

BACKGROUND: The technology of biodegradable materials covering growth factors can be used to make sustained-release microspheres, which provides the feasibility for the efficient utilization of growth factors.
OBJECTIVE: To prepare nano/micron-sized spheres using recombinant human bone morphogenetic protein 2/poly(lactic-co-glycolic acid) (rhBMP-2/PLGA) copolymer and to compare their release behaviors by in vivo and in vitro release experiments.
METHODS: The rhBMP-2/PLGA nano/micron-sized spheres were prepared by emulsion solvent evaporation method to control the rate of pulp mixing. (1) In vitro release experiment: Prepared nano/micron-sized spheres were dissolved in PBS for 70 days, and then ELISA method was used to detect the rhBMP-2 concentration in the supernatant at different time. (2) In vivo release experiment: Forty-four New Zealand rabbits were divided into two groups, and rhBMP-2/PLGA nano/micron-sized spheres were respectively implanted into trochanteric defects. The concentration of rhBMP-2 in the defect site was detected by ELISA within 70 days after implantation.
RESULTS AND CONCLUSION: In vitro sustained release experiment: There was a sudden release of nanospheres in the former 3 days, and the cumulative release nearly reached 41%, followed by a steady and slow release, and then the cumulative release was up to approximately 83% at 70 days. The initial release of micron-sized spheres was less than that of nanospheres, and the cumulative release was about 20% within the former 3 days and reached to 70% at 70 days. In vivo sustained release test: There was a sudden release of the nanospheres, the cumulative release was nearly 35%, followed by a steady and slow release, and then the cumulative release was up to approximately 72% at 70 days. The initial release of micron-sized spheres was less than that of nanospheres, and the cumulative release was about 21% in the former 3 days and increased to about 63% at 70 days. In both in vivo and in vitro release experiments, the release duration of micron-sized spheres was longer than that of nanospheres in the former 3 days. To conclude, the release time of rhBMP-2/PLGA micron-sized spheres fulfills the need of bone growth cycle, therefore, rhBMP-2/PLGA micron-sized spheres are more favorable than rhBMP-2/PLGA nanospheres for bone defect repair in clinical practice.

Key words: Bone Morphogenetic Proteins, Microspheres, Drug Delivery Systems, Tissue Engineering

中图分类号: