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Vascularization for sufficient supplies of oxygen/nutrients and removal of waste in thicker tissue is one of the major challenges in tissue engineering. Here, we used three-dimensional bio-printing technology to engineer a vascular structure within hydrogel scaffold. Through layer-by-layer approach, we seeded endothelial cells in tubular form, which is embedded within three-dimensional collagen scaffold...
Cells cultured within a 3D environment acquire phenotypes and respond to stimuli analogous to in vivo development. This approach can be applied to the study of tumorigenesis in vitro. In this study, collagen I hydrogels were engineered as a platform for in vitro solid tumor development. Cell seeding density, scaffold thickness, and matrix stiffness were varied to characterize the development of a...
This paper describes a centimeter-scale living cell fabric made of cell-containing core-shell hydrogel fibers, “cell fiber.” We improved core-shell fiber applicable to various types of cells, and precisely characterized their biofunctions and mechanical properties. Using these cell fibers, we demonstrate a centimeter-scale living cell fabric woven by our micro weaving machine. We believe that our...
This paper describes core-shell hydrogel wires for constructing 3D heterogeneous hydrogel microstructures containing biomaterials. A core hydrogel layer contains biomaterials such as cells, and a shell hydrogel layer covers the core to realize a mechanically-robust hydrogel wire. Using this core-shell gel wires, we demonstrate a woven sheet with heterogeneous gel wires by using our stereolithographically-made...
In this study, we report a newly developed three-dimensional (3D) biological printer using non-contact, electromechanical microvalves with a nozzle diameter of 150 mum. To control and utilize this printer for life science applications, we developed an easy-to-use control software with a graphic user interface (GUI). First, using the printer, we tested the viability of dispensed mammalian cells after...
dasiaBrain on Chippsila technologies based on two-dimensional in-vitro neural cultures have attracted much interest in both basic and applied neuroscience over the past two decades. Extending this technology towards more brain-like three-dimensional geometries while maintaining the ability to record and/or control the neural activity is an important neural engineering challenge. We have developed...
Microscale technologies are emerging as enabling tools for tissue engineering and biology. Here, we present our experience in developing microscale technologies to regulate cell-microenvironment interactions and generate engineered tissues. Specifically, we will describe the use of microengineered shape-controlled hydrogels to generate biomimetic 3D tissue architectures, the utility of surface patterning...
We created 3D tissue constructs epitaxially by printing cell-laden hydrogel droplets. The ability to bioengineer 3D tissues is a powerful new approach to treat diverse diseases such as cancer, loss of tissue function, or organ failure. Inspired by the molecular beam epitaxy technique, a common semiconductor manufacturing technology, we present a platform that prints the first example of a 3D smooth...
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