Kundu Joydip, Shim Jin-Hyung, Jang Jinah, Kim Sung-Won, Cho Dong-Woo
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Kyungbuk, South Korea.
Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology (POSTECH), Kyungbuk, South Korea.
J Tissue Eng Regen Med. 2015 Nov;9(11):1286-97. doi: 10.1002/term.1682. Epub 2013 Jan 24.
Regenerative medicine is targeted to improve, restore or replace damaged tissues or organs using a combination of cells, materials and growth factors. Both tissue engineering and developmental biology currently deal with the process of tissue self-assembly and extracellular matrix (ECM) deposition. In this investigation, additive manufacturing (AM) with a multihead deposition system (MHDS) was used to fabricate three-dimensional (3D) cell-printed scaffolds using layer-by-layer (LBL) deposition of polycaprolactone (PCL) and chondrocyte cell-encapsulated alginate hydrogel. Appropriate cell dispensing conditions and optimum alginate concentrations for maintaining cell viability were determined. In vitro cell-based biochemical assays were performed to determine glycosaminoglycans (GAGs), DNA and total collagen contents from different PCL-alginate gel constructs. PCL-alginate gels containing transforming growth factor-β (TGFβ) showed higher ECM formation. The 3D cell-printed scaffolds of PCL-alginate gel were implanted in the dorsal subcutaneous spaces of female nude mice. Histochemical [Alcian blue and haematoxylin and eosin (H&E) staining] and immunohistochemical (type II collagen) analyses of the retrieved implants after 4 weeks revealed enhanced cartilage tissue and type II collagen fibril formation in the PCL-alginate gel (+TGFβ) hybrid scaffold. In conclusion, we present an innovative cell-printed scaffold for cartilage regeneration fabricated by an advanced bioprinting technology.
再生医学旨在通过细胞、材料和生长因子的组合来改善、修复或替换受损组织或器官。组织工程学和发育生物学目前都涉及组织自组装和细胞外基质(ECM)沉积的过程。在本研究中,使用具有多头沉积系统(MHDS)的增材制造(AM)技术,通过逐层(LBL)沉积聚己内酯(PCL)和包封软骨细胞的海藻酸盐水凝胶来制造三维(3D)细胞打印支架。确定了用于维持细胞活力的合适细胞分配条件和最佳海藻酸盐浓度。进行了基于细胞的体外生化分析,以测定不同PCL-海藻酸盐凝胶构建体中的糖胺聚糖(GAGs)、DNA和总胶原蛋白含量。含有转化生长因子-β(TGFβ)的PCL-海藻酸盐凝胶显示出更高的ECM形成。将PCL-海藻酸盐凝胶的3D细胞打印支架植入雌性裸鼠的背部皮下空间。4周后对取出的植入物进行组织化学[阿尔新蓝和苏木精-伊红(H&E)染色]和免疫组织化学(II型胶原蛋白)分析,结果显示PCL-海藻酸盐凝胶(+TGFβ)混合支架中软骨组织和II型胶原纤维形成增强。总之,我们展示了一种通过先进生物打印技术制造的用于软骨再生的创新型细胞打印支架。