Park Ju Young, Shim Jin-Hyung, Choi Song-Ah, Jang Jinah, Kim Myungshin, Lee Sang Hwa, Cho Dong-Woo
Division of Integrative Biosciences and Biotechnology, POSTECH, Pohang, Korea.
J Mater Chem B. 2015 Jul 21;3(27):5415-5425. doi: 10.1039/c5tb00637f. Epub 2015 Jun 5.
When large engineered tissue structures are used to achieve tissue regeneration, formation of vasculature is an essential process. We report a technique that combines 3D printing with spatial and temporal control of dual growth factors to prevascularize bone tissue. Human dental pulp stem cells (DPSCs) that have both osteogenic and vasculogenic potential were printed with bone morphogenetic protein-2 (BMP-2) in the peripheral zone of the 3D printed construct, and with the vascular endothelial growth factor (VEGF) in the central zone, in which a hypoxic area forms. The structure was implanted in the back of a mouse and tissue regeneration was assessed after 28 d. Microvessels were newly formed in the hypoxic area of the printed large volume structure, and angiogenesis from the host tissue was also observed. Bone regeneration was faster in prevascularized structures than in nonvascularized structures. The 3D-printed prevascularized structure could be a promising approach to overcome the size limitation of tissue implants and to enhance bone regeneration.
当使用大型工程化组织结构来实现组织再生时,血管形成是一个必不可少的过程。我们报告了一种将3D打印与双生长因子的空间和时间控制相结合的技术,以预先形成骨组织的血管。具有成骨和血管生成潜力的人牙髓干细胞(DPSC)与骨形态发生蛋白-2(BMP-2)一起打印在3D打印构建体的外周区域,并与血管内皮生长因子(VEGF)一起打印在形成缺氧区域的中央区域。将该结构植入小鼠背部,并在28天后评估组织再生情况。在打印的大体积结构的缺氧区域新形成了微血管,并且还观察到来自宿主组织的血管生成。预先形成血管的结构中的骨再生比未形成血管的结构更快。3D打印的预先形成血管的结构可能是克服组织植入物尺寸限制并增强骨再生的一种有前途的方法。