评价负载 BMP-2 和 VEGF 的 3D 打印羟基磷灰石复合支架的体外和体内增强成骨能力。

Evaluation of BMP-2 and VEGF loaded 3D printed hydroxyapatite composite scaffolds with enhanced osteogenic capacity in vitro and in vivo.

机构信息

Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, China.

Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, China; Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China.

出版信息

Mater Sci Eng C Mater Biol Appl. 2020 Jul;112:110893. doi: 10.1016/j.msec.2020.110893. Epub 2020 Mar 21.

Abstract

Large-sized bone defect repair is a challenging task in orthopedic surgery. Porous scaffolds with controlled release of growth factors have been investigated for many years. In this study, a hydroxyapatite composite scaffold was prepared by 3D printing at low temperature and coating with layer-by-layer (LBL) assembly. Bone morphogenic protein-2 (BMP-2) and vascular endothelial growth factors (VEGF) were loaded into the composite scaffolds. The release of dual growth factors was analyzed in vitro. The cell growth and osteogenic differentiation were assessed by culturing MC3T3-E1 cells onto the scaffolds. In an established rabbit model of critical-sized calvarial defect (15 mm in diameter), the osteogenic and angiogenic properties after implantation of scaffolds were evaluated by micro-computed tomography (micro-CT) and stained sections. Our results showed that the scaffolds possessed well-designed porous structure and could release two growth factors in a sustained way. The micro-CT analysis showed that the scaffolds with BMP-2/VEGF could accelerate new bone formation. Findings of immunochemical staining of collagen type I and lectin indicated that better osteogenic and angiogenic properties induced by BMP-2 and VEGF. These results suggested that the novel composite scaffolds combined with BMP-2/VEGF had both osteogenic and angiogenic abilities which could enhance new bone formation with good quality. Thus, the combination of 3D printed scaffolds loaded with BMP-2/VEGF might provide a potential solution for bone repair and regeneration in clinical applications.

摘要

大尺寸骨缺损的修复是骨科领域的一项极具挑战性的任务。多年来,人们一直在研究具有生长因子控释功能的多孔支架。在本研究中,采用低温 3D 打印技术制备了羟基磷灰石复合支架,并通过层层自组装(LBL)进行了涂层处理。将骨形态发生蛋白-2(BMP-2)和血管内皮生长因子(VEGF)载入复合支架中。体外分析了双重生长因子的释放情况。通过将 MC3T3-E1 细胞培养在支架上,评估了细胞的生长和成骨分化情况。在建立的兔临界尺寸颅骨缺损(直径 15mm)模型中,通过微计算机断层扫描(micro-CT)和染色切片评估了支架植入后的成骨和血管生成特性。结果表明,支架具有设计良好的多孔结构,可以持续释放两种生长因子。micro-CT 分析表明,负载 BMP-2/VEGF 的支架可以加速新骨形成。胶原 I 型和凝集素免疫化学染色的结果表明,BMP-2 和 VEGF 诱导了更好的成骨和血管生成特性。这些结果表明,新型复合支架结合 BMP-2/VEGF 具有成骨和血管生成能力,可以通过良好的质量来增强新骨形成。因此,负载 BMP-2/VEGF 的 3D 打印支架的组合可能为临床应用中的骨修复和再生提供一种潜在的解决方案。

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