Abstract
The fabrication of 3D tissues retaining the original functions of tissues/organs in vitro is crucial for optimal tissue engineering and regenerative medicine. The fabrication of 3D tissues also contributes to the establishment of in vitro tissue/organ models for drug screening. Our laboratory has developed a fabrication system for functional 3D tissues by stacking cell sheets of confluent cultured cells detached from a temperature-responsive culture dish. Here we describe the protocols for the fabrication of 3D tissues by cell sheet engineering. Three-dimensional cardiac tissues fabricated by stacking cardiac cell sheets pulsate spontaneously, synchronously and macroscopically. Via this protocol, it is also possible to fabricate other tissues, such as 3D tissue including capillary-like prevascular networks, from endothelial cells sandwiched between layered cell sheets. Cell sheet stacking technology promises to provide in vitro tissue/organ models and more effective therapies for curing tissue/organ failures.
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Change history
03 May 2013
In the version of this article initially published, the amount of gelatin powder to be added to Hank's balanced salt solution to give a 10-ml total volume when fabricating a gel was given as 0.75 mg. It should be 0.75 g. The error has been corrected in the HTML and PDF versions of the article.
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Acknowledgements
This work was supported by grants from the Global Center of Excellence Program, Multidisciplinary Education and Research Center for the establishment of Regenerative Medicine (MERCREM); the Innovation Center for Fusion of Advanced Technologies by special coordination funds for promoting science; the High-Tech Research Center Program from the Ministry of Education, Culture, Sports, Science and Technology (MEXST), Japan; and the Japan Society for the Promotion of Science (JSPS) through the ′Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program),′ initiated by the Council for Science and Technology Policy (CSTP).
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Contributions
Y.H. designed and conducted experiments, analyzed data and wrote the paper. T. Shimizu designed and conducted experiments, analyzed data and wrote the paper, and supervised this project. T. Sasagawa, H.S., K.S., T.K., W.S. and S.S. designed and conducted experiments. M.Y., M.U. and T.O. supervised the project.
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Competing interests
Tatsuya Shimizu and Yamato Masayuki are consultants for CellSeed, Inc. Tetsutaro Kikuchi is an employee of CellSeed, Inc. Teruo Okano is an investor in CellSeed, Inc. and an investor/developer designated on the patent for temperature-responsive culture surfaces. No other competing financial interests exist.
Supplementary information
Supplementary Video 1
Layering of two mouse myoblast C2C12 cell sheets using a simple pipetting method. The C2C12 cell sheets were fabricated as described in method 4 of the Supplementary Methods. The size of the two culture dishes is 35 mm. (MOV 9567 kb)
Supplementary Video 2
Preparation of a gelatin gel-coated plunger-like manipulator and placement of the manipulator with a plunger-guiding cover onto a temperature-responsive culture dish. Similar procedures are performed when using fibrin gel. (MOV 9457 kb)
Supplementary Video 3
Transplantation of a layered-cardiac cell sheet onto the dorsal subcutaneous tissue. The cell sheet constructs were lifted onto a sterile polyethylene terephthalate (PET) film and transplanted onto the dorsal subcutaneous tissue by sliding it from the PET film using two forceps (straight and warping type). (MOV 2018 kb)
Supplementary Video 4
Detaching of a cardiac cell sheet by low temperature treatment (20 oC). The phase contrast microscopic image was recorded by a digital video recorder through a CCD camera. (MOV 3170 kb)
Supplementary Video 5
Spontaneous, synchronous, and macroscopic beating of a layered cardiac cell sheet in a culture dish and on fibrin gel. These layered cell sheets were macroscopically observed by using a digital video camera. (MOV 3747 kb)
Supplementary Methods
Fabrication of a cardiac cell sheet using neonatal rat cardiac cells; Preparation of a temperature-responsive culture dish; Fabrication and histological observation of prevascularized three-dimensional cell-dense tissues; and Fabrication of a C2C12 cell sheet. (PDF 90 kb)
Supplementary Table 1
Fabrication conditions for several cell sheets. (PDF 35 kb)
Supplementary Figures 1–5
Supplementary Fig. 1 (PDF 717 kb)
Detailed explanation of cell sheet layering using a simple pipetting method. (a) Spread and adhere the first recovered cell sheet onto culture material. (b) To layer the cell sheets, place and spread a second recovered cell sheet onto the dish which will adhere to the first cell sheet. Three-dimensional tissue is fabricated by repeating the same procedures. All culture dishes in the figure are 35-mm.
Supplementary Fig. 2
Detailed explanation of cell sheet layering using a hydrogel-coated plunger-like manipulator. (a) The upper silicon mold with a circular hole is put on the lower silicon mold. (b) The color of the gelatin solution changes to red from yellow by the addition of NaOH. (c) A hydrogel-coated plunger-like manipulator is fabricated by using hydrogel solution, two silicone molds, and a plunger-like manipulator. (d, e) After removing the hydrogel overflow, take out the two silicon molds from the manipulator to expose the hydrogel. (f) Place the hydrogel-coated manipulator with a plunger-guiding cover on a temperature-responsive culture dish (TRCD) containing the confluent cells. (g) After incubation at 20 °C, lift up the manipulator holding a cell sheet. After repeating the same procedures, recover a multi-layered cell sheet on hydrogel by using a scalpel and transfer onto another culture material by using forceps (h) or use directly for transplantation.
Supplementary Fig. 3
The dimensions of the silicon molds and the hole (a), and the plunger-like manipulator with the guiding cover (b). The thicknesses of the silicon molds are approximately 1-2 mm. These dimensions of the manipulators are applied to a 35-mm culture dish and can be scaled up/down depending on the dish size. For example, in the case of a 60-mm dish, the hole size in the silicon mold would be 48-mm.
Supplementary Fig. 4
Recovery of an intact cell sheet by seeding with the optimal cell numbers. (a) With optimal cell numbers an intact cell sheet can be recovered. (b) With less than optimal cell numbers, a broken cell sheet or a cell sheet having many holes is recovered. (c) With sparse number of cells, seeded cells cannot be recovered as an intact cell sheet. All culture dishes are 35 mm.
Supplementary Fig. 5
Transfer a layered cell sheet construct with hydrogel onto another culture material and subsequent in vitro culture of the construct. (a) The cultivation of a layered cell sheet construct on fibrin gel. (b) After re-adhering a layered cell sheet construct onto a culture material surface and removing the gelatin gel, it forms a layered cell sheet construct without any gel.
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Haraguchi, Y., Shimizu, T., Sasagawa, T. et al. Fabrication of functional three-dimensional tissues by stacking cell sheets in vitro. Nat Protoc 7, 850–858 (2012). https://doi.org/10.1038/nprot.2012.027
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DOI: https://doi.org/10.1038/nprot.2012.027
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