Biomed Res Int:nHAC/PLGA支架控释BMP-2和VEGF对成骨作用的协同作用

2018-11-01 MedSci MedSci原创

组织工程骨在巨大骨缺损修复方面具有很大优势;在生长因子的诱导下,种子细胞分化为成骨细胞,支架材料逐渐降解并被新生骨代替,模拟骨再生的实际病理生理过程。然而,需要进行机制研究并进一步开发以指导元素选择和优化。 在本研究中,我们制备了血管内皮生长因子/骨形态发生蛋白-2-纳米羟基磷灰石/胶原(VEGF/BMP-2-nHAC/PLGA)支架,并接种了小鼠MC3T3-E1前成骨细胞,以检测成骨指标和

组织工程骨在巨大骨缺损修复方面具有很大优势;在生长因子的诱导下,种子细胞分化为成骨细胞,支架材料逐渐降解并被新生骨代替,模拟骨再生的实际病理生理过程。然而,需要进行机制研究并进一步开发以指导元素选择和优化。

在本研究中,我们制备了血管内皮生长因子/骨形态发生蛋白-2-纳米羟基磷灰石/胶原(VEGF/BMP-2-nHAC/PLGA)支架,并接种了小鼠MC3T3-E1前成骨细胞,以检测成骨指标和相关信号通路的激活。假设是创建一个模拟骨缺损修复的三维环境,并应用p38丝裂原活化激酶(p38)抑制剂,并将osterix shRNA转移到小鼠MC3T3-E1前成骨细胞中,以进一步研究BMP-2和VEGF之间串扰的分子机制。

结果显示:(1)BMP-2和VEGF可持续地从PLGA微球中释放。(2)nHAC/PLGA载支架占据三维多孔结构,具有优异的物理性能。(3)MC3T3-E1细胞在支架中增殖和分化良好。(4)VEGF/BMP-2载支架成骨分化相关因子表达明显高于其他组;p38抑制剂SB203580降低了osterix表达的细胞核/细胞质比率。

总之,我们制备的活性人工骨可以为MC3T3-E1细胞提供有利的生长空间,同时VEGF和BMP-2处理增强的成骨和成熟可能主要通过激活p38 MAPK通路促进osterix蛋白质核转位。

原始出处:

Ting Wang, Shu Guo, et al., Synergistic Effects of Controlled-Released BMP-2 and VEGF from nHAC/PLGAs Scaffold on Osteogenesis. Biomed Res Int. 2018; 2018: 3516463.

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    2019-04-26 venlin
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    2019-01-23 sunylz
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    2019-06-22 HNYYM
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    2018-11-03 zhaojie88
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