Abstract
The creation of single and multilayered adult stem cells (ASCs) sheets is presented. The stem cell sheets preserve the cell–cell and cell–extracellular matrices and are developed by utilizing a thermally reversible methylcellulose (MC) coated tissue culture polystyrene (TCPS) dish. This technique is an improvement and a simplification of earlier noninvasive cell retrieval methods based on the use of a temperature-responsive poly(N-isopropylacrylamide) (PIPAAm) coated TCPS dishes. The optimal combination of MC–water–salt was determined to be 12–14% of MC (mol. wt. of 15,000) in water with 0.5× PBS (~150 mOsm). This solution exhibited a gel formation temperature of ~32 °C. The addition (evenly spread) of 1 ml of 3 mg/ml rat tail type-I (pH adjusted to 7.5) over the MC coated surface at 37 °C improves ASC adhesion and proliferation on the methylcellulose system. Upon confluence, a continuous monolayer ASC sheet was formed on the surface of the MC hydrogel system. When the grown cell sheet was removed from the incubator and exposed to room temperature (~30 °C), it spontaneously and gradually detached from the surface of the thermoresponsive hydrogel, creating an ASC sheet.
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Acknowledgments
The authors thank Dr. Elizabeth Clubb and Dr. James Wade at the Pennington Biomedical Research Center (PBRC) for supplying the liposuction aspirates and their many patients for consenting to participate in this protocol. Acknowledgements are also due to Dr. Gimble, a longtime colleague and friend without whose help this work would never have been initiated. And finally, acknowledgements are also due to Dr. S. Thirumala for performing the seminal experiments reported in this chapter. This work was supported in part by funding from the Louisiana Board of Regents and the Department of Mechanical Engineering at the Louisiana State University (LSU). Anoosha Forghani was supported the NSF EPSCoR LA-SiGMA project under award #EPS-1003897.
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Forghani, A., Devireddy, R. (2018). Methylcellulose Based Thermally Reversible Hydrogels. In: Bunnell, B.A., Gimble, J.M. (eds) Adipose-Derived Stem Cells. Methods in Molecular Biology, vol 1773. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7799-4_5
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DOI: https://doi.org/10.1007/978-1-4939-7799-4_5
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