Derivation, expansion and differentiation of induced pluripotent stem cells in continuous suspension cultures

David A Fluri, Peter D Tonge, Hannah Song, Ricardo P Baptista, Nika Shakiba, Shreya Shukla, Geoffrey Clarke, Andras Nagy & Peter W Zandstra

We describe derivation of induced pluripotent stem cells (iPSCs) from terminally differentiated mouse cells in serum- and feeder-free stirred suspension cultures. Temporal analysis of global gene expression revealed high correlations between cells reprogrammed in suspension and cells reprogrammed in adhesion-dependent conditions. Suspension culture–reprogrammed iPSCs (SiPSCs) could be differentiated into all three germ layers in vitro and contributed to chimeric embryos in vivo. SiPSC generation allowed for efficient selection of reprogramming factor–expressing cells based on their differential survival and proliferation in suspension culture. Seamless integration of SiPSC reprogramming and directed differentiation enabled scalable production of beating cardiac cells in a continuous single cell– and small aggregate–based process. This method is an important step toward the development of robust PSC generation, expansion and differentiation technology.

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