The State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310028, People's Republic of China.
Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310028, People's Republic of China.
Biofabrication. 2021 May 5;13(3). doi: 10.1088/1758-5090/abf995.
Tubular scaffolds serve as a controllable extracellular environment to guide the repair and regeneration of tissues. But it is still a challenge to achieve both excellent mechanical properties and cell compatibility of artificial scaffolds for long-term structural and biological stability. In this study, a four-step solution casting method was developed to fabricate dual-layer cell-laden tubular scaffolds for nerve and bile duct regeneration. The dual-layer tubular scaffold consisted of a bone marrow mesenchymal stem cells (BMSCs)-laden hydrogel inner layer and an outer layer of gelatin methacrylate (GelMA)/polyethylene glycol diacrylate. While the inner layer had a good biocompatibility, the outer layer had desired mechanical properties. The interfacial toughness, Young's modulus, maximum tensile strain, and compressive modulus of dual-layer tubular scaffolds were 65 J m, 122.37 ± 23.21 kPa, 100.87 ± 40.10%, and 39.14 ± 18.56 N m, respectively. More importantly, the fabrication procedure was very cell-friendly, since the BMSC viability encapsulated in the inner layer of 10% (w/v) GelMA reached 94.68 ± 0.43% after 5 d of culture. Then, a preliminary evaluation of the potential application of dual-layer tubular scaffolds as nerve conduits and biliary scaffolds was performed, and demonstrated that the cell-laden dual-layer tubular scaffolds proposed in this work are expected to extend the application of tubular scaffolds in tissue engineering.
管状支架可作为一种可控的细胞外环境,指导组织的修复和再生。但是,要实现人工支架的优异机械性能和细胞相容性,以实现长期的结构和生物稳定性,仍然是一个挑战。在这项研究中,开发了一种四步溶液浇铸法来制备用于神经和胆管再生的双层细胞负载管状支架。双层管状支架由骨髓间充质干细胞(BMSCs)负载的水凝胶内层和明胶甲基丙烯酸酯(GelMA)/聚乙二醇二丙烯酸酯外层组成。内层具有良好的生物相容性,而外层具有所需的机械性能。双层管状支架的界面韧性、杨氏模量、最大拉伸应变和压缩模量分别为 65 J m、122.37±23.21 kPa、100.87±40.10%和 39.14±18.56 N m。更重要的是,由于内层中 10%(w/v)GelMA 包封的 BMSC 活力在培养 5 天后达到 94.68±0.43%,因此制造过程非常适合细胞。然后,对双层管状支架作为神经导管和胆管支架的潜在应用进行了初步评估,并证明了本工作中提出的细胞负载双层管状支架有望扩展管状支架在组织工程中的应用。