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通过桌面立体光刻3D打印和静电纺丝制造高度对齐的神经支架

Fabrication of a Highly Aligned Neural Scaffold via a Table Top Stereolithography 3D Printing and Electrospinning<sup/>.

作者信息

Lee Se-Jun, Nowicki Margaret, Harris Brent, Zhang Lijie Grace

机构信息

1 Department of Mechanical and Aerospace Engineering, The George Washington University , Washington, District of Columbia.

2 Department of Neurology and Pathology, Georgetown University , Washington, District of Columbia.

出版信息

Tissue Eng Part A. 2017 Jun;23(11-12):491-502. doi: 10.1089/ten.TEA.2016.0353. Epub 2017 Jan 11.

Abstract

Three-dimensional (3D) bioprinting is a rapidly emerging technique in the field of tissue engineering to fabricate extremely intricate and complex biomimetic scaffolds in the range of micrometers. Such customized 3D printed constructs can be used for the regeneration of complex tissues such as cartilage, vessels, and nerves. However, the 3D printing techniques often offer limited control over the resolution and compromised mechanical properties due to short selection of printable inks. To address these limitations, we combined stereolithography and electrospinning techniques to fabricate a novel 3D biomimetic neural scaffold with a tunable porous structure and embedded aligned fibers. By employing two different types of biofabrication methods, we successfully utilized both synthetic and natural materials with varying chemical composition as bioink to enhance biocompatibilities and mechanical properties of the scaffold. The resulting microfibers composed of polycaprolactone (PCL) polymer and PCL mixed with gelatin were embedded in 3D printed hydrogel scaffold. Our results showed that 3D printed scaffolds with electrospun fibers significantly improve neural stem cell adhesion when compared to those without the fibers. Furthermore, 3D scaffolds embedded with aligned fibers showed an enhancement in cell proliferation relative to bare control scaffolds. More importantly, confocal microscopy images illustrated that the scaffold with PCL/gelatin fibers greatly increased the average neurite length and directed neurite extension of primary cortical neurons along the fiber. The results of this study demonstrate the potential to create unique 3D neural tissue constructs by combining 3D bioprinting and electrospinning techniques.

摘要

三维(3D)生物打印是组织工程领域中一种迅速兴起的技术,用于制造微米级极其精细和复杂的仿生支架。这种定制的3D打印构建体可用于软骨、血管和神经等复杂组织的再生。然而,由于可打印墨水的选择有限,3D打印技术通常对分辨率的控制有限,且机械性能受损。为了解决这些限制,我们将立体光刻和静电纺丝技术相结合,制造了一种具有可调多孔结构和嵌入排列纤维的新型3D仿生神经支架。通过采用两种不同类型的生物制造方法,我们成功地利用了化学成分不同的合成材料和天然材料作为生物墨水,以提高支架的生物相容性和机械性能。由聚己内酯(PCL)聚合物和与明胶混合的PCL组成的微纤维被嵌入3D打印的水凝胶支架中。我们的结果表明,与没有纤维的支架相比,带有静电纺丝纤维的3D打印支架显著提高了神经干细胞的粘附。此外,与裸对照支架相比,嵌入排列纤维的3D支架显示出细胞增殖增强。更重要的是,共聚焦显微镜图像表明,带有PCL/明胶纤维的支架极大地增加了原代皮质神经元的平均神经突长度,并引导神经突沿纤维延伸。这项研究的结果证明了通过结合3D生物打印和静电纺丝技术创建独特的3D神经组织构建体的潜力。

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