You Fu, Eames B Frank, Chen Xiongbiao
Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada.
Department of Anatomy and Cell Biology, College of Medicine, University of Saskatchewan, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada.
Int J Mol Sci. 2017 Jul 23;18(7):1597. doi: 10.3390/ijms18071597.
Extrusion-based bioprinting (EBB) is a rapidly developing technique that has made substantial progress in the fabrication of constructs for cartilage tissue engineering (CTE) over the past decade. With this technique, cell-laden hydrogels or bio-inks have been extruded onto printing stages, layer-by-layer, to form three-dimensional (3D) constructs with varying sizes, shapes, and resolutions. This paper reviews the cell sources and hydrogels that can be used for bio-ink formulations in CTE application. Additionally, this paper discusses the important properties of bio-inks to be applied in the EBB technique, including biocompatibility, printability, as well as mechanical properties. The printability of a bio-ink is associated with the formation of first layer, ink rheological properties, and crosslinking mechanisms. Further, this paper discusses two bioprinting approaches to build up cartilage constructs, i.e., self-supporting hydrogel bioprinting and hybrid bioprinting, along with their applications in fabricating chondral, osteochondral, and zonally organized cartilage regenerative constructs. Lastly, current limitations and future opportunities of EBB in printing cartilage regenerative constructs are reviewed.
基于挤压的生物打印(EBB)是一项快速发展的技术,在过去十年中,它在软骨组织工程(CTE)构建体的制造方面取得了重大进展。通过这项技术,含细胞的水凝胶或生物墨水已被逐层挤压到打印平台上,以形成具有不同尺寸、形状和分辨率的三维(3D)构建体。本文综述了可用于CTE应用中生物墨水配方的细胞来源和水凝胶。此外,本文还讨论了应用于EBB技术的生物墨水的重要特性,包括生物相容性、可打印性以及机械性能。生物墨水的可打印性与第一层的形成、墨水流变学特性以及交联机制有关。此外,本文还讨论了两种构建软骨构建体的生物打印方法,即自支撑水凝胶生物打印和混合生物打印,以及它们在制造软骨、骨软骨和区域组织化软骨再生构建体中的应用。最后,综述了EBB在打印软骨再生构建体方面的当前局限性和未来机遇。