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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Stem cells are undifferentiated cells that divide and produce different types of cells. Ordinarily, cells that have differentiated into a specific cell type are post-mitotic—that is, they no longer divide. However, scientists have found a way to reprogram these mature cells so that they “de-differentiate” and return to an unspecialized, proliferative state. These cells are also pluripotent like embryonic stem cells—able to produce all cell types—and are therefore...
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Kinetic Measurement and Real Time Visualization of Somatic Reprogramming
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cAMP and EPAC Signaling Functionally Replace OCT4 During Induced Pluripotent Stem Cell Reprogramming.

Ashley L Fritz1, Maroof M Adil1, Sunnie R Mao1

  • 1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California, USA.

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|February 11, 2015
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Summary
This summary is machine-generated.

Cyclic AMP (cAMP) signaling can replace the OCT4 transcription factor to induce pluripotency in stem cell reprogramming. This pathway enhances reprogramming by promoting epithelial gene expression and cell proliferation.

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Area of Science:

  • Stem cell biology
  • Molecular and cellular reprogramming
  • Regenerative medicine

Background:

  • Induced pluripotent stem cells (iPSCs) are generated using reprogramming factors like OCT4, SOX2, KLF4, and C-MYC (OSKM).
  • While nuclear factors are crucial, signaling pathways also play a significant role in cellular reprogramming.

Purpose of the Study:

  • To identify signaling pathways that can substitute for individual transcription factors during reprogramming.
  • To investigate the role of cyclic AMP (cAMP) signaling in replacing OCT4 for pluripotency induction.

Main Methods:

  • Quantitative, medium-throughput screening of signaling pathways.
  • Functional assays to assess pluripotency induction and replacement of OCT4.
  • Analysis of downstream signaling components, including EPAC and PKA.

Main Results:

  • Several signaling pathways, including cAMP, could induce alkaline phosphatase positive colonies without OCT4.
  • cAMP signaling was found to be necessary and sufficient for OCT4 replacement in pluripotency induction.
  • The exchange protein directly activated by cAMP (EPAC) pathway, not protein kinase A (PKA), mediates this effect.
  • cAMP signaling promotes reprogramming by upregulating epithelial genes, downregulating mesenchymal genes, and increasing proliferation.

Conclusions:

  • Cyclic AMP (cAMP) signaling functionally replaces OCT4 in inducing pluripotency.
  • EPAC-mediated cAMP signaling offers a novel strategy for reprogramming methodologies.
  • Understanding these signaling mechanisms advances stem cell biology and regenerative medicine.