Reprogramming of somatic cells into pluripotent stem cells has been reported by introducing a combination of several transcription factors (Oct3/4, Sox2, Klf4 and c-Myc). The induced pluripotent stem (iPS) cells from patient's somatic cells could be a useful source for drug discovery and cell transplantation therapies. However, to date, most iPS cells were made using viral vectors, such as retroviruses and lentiviruses. Here we describe an alternative method to generate iPS cells from mouse embryonic fibroblasts (MEFs) by continual transfection of plasmid vectors. This protocol takes around 2 months to complete, from MEF isolation to iPS cell establishment. Although the reprogramming efficiency of this protocol is still low, the established iPS cells are most likely free from plasmid integration. This virus-free technique reduces the safety concern for iPS cell generation and application, and provides a source of cells for the investigation of the mechanisms underlying reprogramming and pluripotency.
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We are grateful to Drs. M. Nakagawa, K. Yae, M. Koyanagi and K. Tanabe for scientific discussion, and to K. Takeda and T. Ishii for critical reading of the paper. We also thank T. Ichisaka, K. Okuda, M. Narita, A. Okada, N. Takizawa, R. Kato, R. Iyama, E. Nishikawa, Y. Shimazu and N. Maruhashi for technical and administrative supports. We also thank J. Miyazaki for the CAG promoter. This study was supported in part by a grant from the Program for Promotion of Fundamental Studies in Health Sciences of NIBIO, a grant from the Leading Project of MEXT, a grant from Uehara Memorial Foundation and Grants-in-Aid for Scientific Research of JSPS and MEXT (to S.Y.). K.O. was a JSPS research fellow. H.H. is supported by a Japanese Government (MEXT) Scholarship.
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Okita, K., Hong, H., Takahashi, K. et al. Generation of mouse-induced pluripotent stem cells with plasmid vectors. Nat Protoc 5, 418–428 (2010). https://doi.org/10.1038/nprot.2009.231
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