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Bioprinting of coaxial multicellular structures for a 3D co-culture model

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机构: [a]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China [b]Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, People's Republic of China [c]Department of Neurosurgery, Beijing Luhe Hospital, Capital Medical University, Beijing 101149, People's Republic of China [d]Department of Precision Medicine and Healthcare, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, People's Republic of China
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关键词: Alginate hydrogel Co-culture model Coaxial nozzle Collagen

摘要:
With three dimensional (3D) bioprinting technology, it is feasible to fabricate various types of tissue models, in which multiple kinds of cells can be co-cultured. In this study, a novel 3D coaxial co-culture model in vitro was established by direct bioprinting. Using a four-layer coaxial nozzle, novel coaxial multicellular structures were fabricated, which contained two layers of alginate hydrogel as shell and two layers of hollow channels for cell perfusion. Sodium alginate (Na-Alg) was crosslinked by calcium cation with the contact of coaxial flows, forming a tubular coaxial structure of hydrogel. Human umbilical vein endothelial cells (HUVECs) and human umbilical vein smooth muscle cells (HUVSMCs) were used for a typical vascular co-culture model. Collagen solutions loaded with HUVECs and HUVSMCs were perfused into the layers of hollow channels and gelled at 37 ℃. The forming effect was favorable with good integrity. Pertinent process parameters of the bioprinting were investigated. Mechanical properties of four-layer coaxial structures were evaluated, indicating the higher mechanical strength than monolayer hydrogel structure. Cell viability assay after cell perfusion showed that the process of cell perfusion was feasible. In 7-day culture, cells maintained a steady proliferation. The immunohistochemical expression of HUVECs and HUVSMCs was detected in the structure. Cell work showed good biological functions of this 3D coaxial co-culture model. © 2018 Elsevier B.V.

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第一作者机构: [a]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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通讯机构: [a]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China [c]Department of Neurosurgery, Beijing Luhe Hospital, Capital Medical University, Beijing 101149, People's Republic of China [d]Department of Precision Medicine and Healthcare, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, People's Republic of China [*1]Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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