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        GMP Scale-Up and Banking of Pluripotent Stem Cells for Cellular Therapy Applications

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        Human pluripotent stem cells (PSCs), which include human embryonic stem cells (ESCs) as well as induced pluripotent stem cells (iPSCs), represent an important source of cellular therapies in regenerative medicine and the study of early human development. As such, it is becoming increasingly important to develop methods for the large-scale banking of human PSC lines. There are several well-established methods for the propagation of human PSCs. The key to development of a good manufacturing practice (GMP) bank is to determine a manufacturing method that is amenable to large-scale production using materials that are fully documented. We have developed several banks of hESCs using animal feeder cells, animal-based matrices, or animal-free matrices. Protocols for growing hESCs on mouse embryonic fibroblasts (MEFs) are well established and are very helpful for producing research grade banks of cells. As most human ESCs cultured by research laboratories have been exposed to xenogeneic reagents, it is not imperative that all materials used in the production of a master cell bank be animal-free in origin. Nevertheless, as the field develops, it will no doubt become increasingly important to produce a bank of cells for clinical use without xenogeneic reagents, particularly nonhuman feeder cells which might harbor viruses with potential risk to human health or cell product integrity. Thus, even for cell lines previously exposed to xenogeneic reagents, it is important to minimize any subsequent exposure of the cell lines to additional adventitious agents. We have specifically described procedures for the growth of hESCs on Matrigel, an animal-matrix, and CELLstart, an animal-free matrix, and these can be used to produce hESCs as part of a clinical manufacturing process.
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