Jung Chi Sung, Kim Byeong Kook, Lee Junhee, Min Byoung-Hyun, Park Sang-Hyug
1Departments of Molecular Science and Technology, Ajou University, 206, World Cup-ro, Yeongtonggu, Suwon, 16499 Korea.
2Department of Nature-Inspired Nano Convergence System, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103 Korea.
Tissue Eng Regen Med. 2017 Dec 28;15(2):155-162. doi: 10.1007/s13770-017-0104-8. eCollection 2018 Apr.
The extracellular matrix (ECM) is known to provide instructive cues for cell attachment, proliferation, differentiation, and ultimately tissue regeneration. The use of decellularized ECM scaffolds for regenerative-medicine approaches is rapidly expanding. In this study, cartilage acellular matrix (CAM)-based bioink was developed to fabricate functional biomolecule-containing scaffolds. The CAM provides an adequate cartilage tissue-favorable environment for chondrogenic differentiation of cells. Conventional manufacturing techniques such as salt leaching, solvent casting, gas forming, and freeze drying when applied to CAM-based scaffolds cannot precisely control the scaffold geometry for mimicking tissue shape. As an alternative to the scaffold fabrication methods, 3D printing was recently introduced in the field of tissue engineering. 3D printing may better control the internal microstructure and external appearance because of the computer-assisted construction process. Hence, applications of the 3D printing technology to tissue engineering are rapidly proliferating. Therefore, printable ECM-based bioink should be developed for 3D structure stratification. The aim of this study was to develop printable natural CAM bioink for 3D printing of a tissue of irregular shape. Silk fibroin was chosen to support the printing of the CAM powder because it can be physically cross-linked and its viscosity can be easily controlled. The newly developed CAM-silk bioink was evaluated regarding printability, cell viability, and tissue differentiation. Moreover, we successfully demonstrated 3D printing of a cartilage-shaped scaffold using only this CAM-silk bioink. Future studies should assess the efficacy of implantation of 3D-printed cartilage-shaped scaffolds.
众所周知,细胞外基质(ECM)为细胞附着、增殖、分化以及最终的组织再生提供指导性线索。用于再生医学方法的脱细胞ECM支架的应用正在迅速扩展。在本研究中,开发了基于软骨脱细胞基质(CAM)的生物墨水来制造含功能性生物分子的支架。CAM为细胞的软骨分化提供了适宜的软骨组织环境。当将盐析、溶剂浇铸、气体成型和冷冻干燥等传统制造技术应用于基于CAM的支架时,无法精确控制支架几何形状以模拟组织形状。作为支架制造方法的替代方案,3D打印最近被引入组织工程领域。由于计算机辅助构建过程,3D打印可以更好地控制内部微观结构和外观。因此,3D打印技术在组织工程中的应用正在迅速增加。因此,应开发可打印的基于ECM的生物墨水用于3D结构分层。本研究的目的是开发可打印的天然CAM生物墨水用于不规则形状组织的3D打印。选择丝素蛋白来支持CAM粉末的打印,因为它可以进行物理交联且其粘度易于控制。对新开发的CAM-丝生物墨水的可打印性、细胞活力和组织分化进行了评估。此外,我们仅使用这种CAM-丝生物墨水成功展示了软骨形状支架的3D打印。未来的研究应评估3D打印的软骨形状支架植入的效果。