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Published Online: 21 September 2012

Induced Pluripotency and Oncogenic Transformation Are Related Processes

Publication: Stem Cells and Development
Volume 22, Issue Number 1

Abstract

Induced pluripotent stem cells (iPSCs) have the potential for creating patient-specific regenerative medicine therapies, but the links between pluripotency and tumorigenicity raise important safety concerns. More specifically, the methods employed for the production of iPSCs and oncogenic foci (OF), a form of in vitro produced tumor cells, are surprisingly similar, raising potential concerns about iPSCs. To test the hypotheses that iPSCs and OF are related cell types and, more broadly, that the induction of pluripotency and tumorigenicity are related processes, we produced iPSCs and OF in parallel from common parental fibroblasts. When we compared the transcriptomes of these iPSCs and OF to their parental fibroblasts, similar transcriptional changes were observed in both iPSCs and OF. A significant number of genes repressed during the iPSC formation were also repressed in OF, including a large cohort of differentiation-associated genes. iPSCs and OF shared a limited number of genes that were upregulated relative to parental fibroblasts, but gene ontology analysis pointed toward monosaccharide metabolism as upregulated in both iPSCs and OF. iPSCs and OF were distinct in that only iPSCs activated a host of pluripotency-related genes, while OF activated cellular damage and specific metabolic pathways. We reprogrammed oncogenic foci (ROF) to produce iPSC-like cells, a process dependent on Nanog. However, the ROF had reduced differentiation potential compared to iPSC, suggesting that oncogenic transformation leads to cellular changes that impair complete reprogramming. Taken together, these findings support a model in which OF and iPSCs are related, yet distinct cell types, and in which induced pluripotency and induced tumorigenesis are similar processes.

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cover image Stem Cells and Development
Stem Cells and Development
Volume 22Issue Number 1January 1, 2013
Pages: 37 - 50
PubMed: 22998387

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Published in print: January 1, 2013
Published ahead of print: 26 October 2012
Published online: 21 September 2012
Accepted: 11 September 2012
Received: 5 July 2012

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John W. Riggs
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.
Bonnie L. Barrilleaux
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.
Natasha Varlakhanova
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.
Kelly M. Bush
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.
Vanessa Chan
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.
Paul S. Knoepfler
Department of Cell Biology and Human Anatomy, University of California Davis School of Medicine, Sacramento, California.
Institute for Regenerative Cures, University of California Davis School of Medicine, Sacramento, California.
Institute of Pediatric Regenerative Medicine, Shriners Hospital For Children Northern California, Sacramento, California.

Notes

Address correspondence to:Dr. Paul S. KnoepflerDepartment of Cell Biology and Human AnatomyUniversity of California Davis School of MedicineSacramento, CA 95616E-mail: [email protected]

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No competing financial interests exist.

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