Chemically defined stem cell culture media are often costly, and the use of mitotically arrested mouse embryonic fibroblasts (MEFs) as feeder cells is a popular and cost-efficient way to maintain induced pluripotent stem cells (iPSCs). However, the commonly used mitotic inhibitor mitomycin-C (MMC) is known to cause cellular metabolic stress. Therefore, our aim was to determine whether such stress in feeder cells indirectly affects iPSC growth during coculture.
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