Figure 1. Schematicdiagram of the overall study design. Figure 2. (A) Macroscopic features, (B) SEM images, (C) pore size and (D) porosity of five concentrations of MECM-basedhydrogels.
紧接着研究者对混合支架的特性进行了研究,发现混合支架能较好地模拟活体组织结构,具有较好的力学性能,并且复合支架材料具有良好的生物相容性和较低的免疫原性(图4)。 Figure 4. A 3D reconstruction model (A2) of the rabbit meniscus (A1) wasgenerated to calculate its size. We then designed a 3D wedge-shaped model withcircumferentially and radially oriented fibers (A4), which simulated thenatural collagen fiber arrangement within the native meniscus (A3). Finally, weinjected the optimized MECM-based hydrogel into the 3D-printed porous PCLscaffold (A5) to construct a PCL-MECM based hydrogel hybrid scaffold (A6). (B)The compression and tensile moduli of the hybrid scaffold and the nativemeniscus. (C) H&E images of the hybrid scaffold’s immune response in vivoat 1 week and 1 month. Figure 5. (A) Scaffold implantation and experiment grouping schema. The blue arrow indicatesa well preserved medial collateral ligament. (B) Macroscopic observations of knee joints at 3 and 6 months after implantation. Excised menisci are shown onthe right. (C) Meniscus covering rates at 3-and 6-months post-operation. Figure 6. (A) Histological staining and immunohistochemical analyses of the regenerated menisci. (B) H&E staining images of the femoralcondyle and tibial plateau cartilage. (C) Ishida histological score for the regenerated menisci. (D) The total collagen and GAG contents, (E)the tensileand compressive moduli of the regenerated menisci. Figure 7. Image evaluation. (A) X-ray and (C) MRI images of rabbit knee joints; (B) K-L grading for X-ray; (D) WORMS assessment for MRI. 本研究由中国人民解放军总医院骨科研究所郭全义教授团队和北京积水潭医院周一新教授团队合作完成,并于2019年10月发表于ACS Appl Mater Interfaces。 Mingxue Chen, Zhaoxuan Feng, Weimin Guo, Dejin Yang, Shuang Gao, Yangyang Li, Shi Shen, Zhiguo Yuan, Bo Huang, Yu Zhang, Mingjie Wang, Xu Li, Libo Hao, Jiang Peng, Shuyun Liu, Yixin Zhou*, and Quanyi Guo*. ACS Appl Mater Interfaces 2019,11(4): 41626-41639.供稿:韩峰审校:朱彩虹编辑:陈起新 |
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