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Induced Pluripotent Stem Cells01:13

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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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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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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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Defined three-dimensional microenvironments boost induction of pluripotency.

Massimiliano Caiazzo1, Yuya Okawa1, Adrian Ranga1

  • 1Laboratory of Stem Cell Bioengineering, Institute of Bioengineering, School of Life Sciences (SV) and School of Engineering (STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Nature Materials
|January 12, 2016
PubMed
Summary
This summary is machine-generated.

Three-dimensional (3D) environments enhance somatic cell reprogramming into induced pluripotent stem cells (iPSCs) by modulating biophysical cues. This 3D approach accelerates cellular transitions and epigenetic changes, boosting iPSC generation.

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Area of Science:

  • Stem Cell Biology
  • Biomedical Engineering
  • Cellular Reprogramming

Background:

  • Induced pluripotent stem cells (iPSCs) are generated using 2D culture systems, but their efficiency and biological fidelity remain areas for improvement.
  • The impact of a 3D environment, which more closely mimics in vivo conditions, on somatic cell reprogramming is largely unexplored.

Purpose of the Study:

  • To systematically investigate the effects of engineered 3D extracellular matrices on somatic cell reprogramming.
  • To identify key biophysical parameters within the 3D microenvironment that influence induced pluripotent stem cell generation.

Main Methods:

  • Engineered 3D extracellular matrices were created with modulated stiffness, degradability, and biochemical composition.
  • Somatic cells were reprogrammed within these 3D microenvironments to assess the impact of varying biophysical cues.
  • Key cellular events, including mesenchymal-to-epithelial transition and epigenetic remodeling, were analyzed.

Main Results:

  • Modulating the 3D microenvironment's physical properties (stiffness, degradability, composition) significantly impacts iPSC generation.
  • Physical cell confinement within the 3D matrix accelerates the mesenchymal-to-epithelial transition (MET).
  • The 3D environment promotes enhanced epigenetic remodeling compared to traditional 2D cultures.

Conclusions:

  • Biophysical cues within 3D microenvironments play a crucial, previously unrecognized role in promoting somatic cell reprogramming.
  • 3D culture systems offer a more biologically relevant platform for generating induced pluripotent stem cells.
  • The physical properties of the 3D microenvironment synergize with reprogramming factors to increase somatic cell plasticity and iPSC generation efficiency.