Three-dimensional culture of chicken primordial germ cells in chemically defined media containing the functional polymer FP003

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Abstract
Scalable production of avian suspension cell exhibits a valuable potential on therapeutic application by producing recombinant protein and as the substrate for virus growth. This study sought to establish a system with chemically defined components for three-dimensional (3D) culture of chicken primordial germ cells (cPGCs), a pluripotent avian cell type. cPGCs were cultured in medium supplemented with the functional polymer FP003. Viscoelasticity was low in this medium, and cPGCs did not sediment,and consequently their expansion was improved. The total number of cPGCs increased by 17-fold after 1week of culture in 3D-FAot medium, an aseric chemically defined medium containing FP003, indicating that this medium enhances the expansion of cPGCs. Moreover, cPGC cell lines stably expressed the germline-specific reporter VASA:tdTOMATO, as well as other markers of cPGCs, for more than 1 month upon culture in 3D-FAot medium, indicating that the characteristics of these cells are maintained. cPGCs harboring both PGK:EGFP and VASA:tdTOMATO robustly expressed both fluorescent proteins upon culture in 3D-FAot, suggesting that this approach is perspective for recombinant protein production. In summary,this novel 3D culture system can be used to efficiently expand cPGCs in suspension without mechanical stirring or loss of cellular properties. This system provides a platform for large-scale culture ofcPGCs in industry.
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