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Inhibition of transforming growth factor β (TGF-β) signaling can substitute for Oct4 protein in reprogramming and

Fangzhi Tan1, Cheng Qian1, Ke Tang2

  • 1From the State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.

The Journal of Biological Chemistry
|December 31, 2014
PubMed

Insights

Inhibiting transforming growth factor-beta (TGF-β) signaling can replace Oct4 in reprogramming and maintain pluripotency in stem cells by modulating FGF/MEK/ERK signaling pathways.

Area of Science:

  • Stem cell biology
  • Developmental biology
  • Cell signaling

Background:

  • Mouse pluripotent stem cells (PSCs), including embryonic stem cells (ES cells) and induced PSCs (iPSCs), are crucial models for studying early embryonic development.
  • Key signaling pathways like LIF/STAT3, Wnt/β-catenin, and FGF/MEK/ERK are known to regulate pluripotency.
  • The precise role of transforming growth factor-beta (TGF-β) signaling in pluripotency generation and maintenance remains largely undefined.

Purpose of the Study:

  • To investigate the function of TGF-β signaling in the generation and maintenance of pluripotent stem cells.
  • To determine if TGF-β signaling inhibition can influence the reprogramming process and sustain pluripotency.
  • To elucidate the molecular mechanisms by which TGF-β signaling impacts PSCs.

Main Methods:

  • Utilized SB431542, a specific inhibitor of TGF-β signaling.
  • Assessed the effect of TGF-β inhibition on the reprogramming of cells into induced PSCs (iPSCs).
  • Examined the impact of TGF-β inhibition on maintaining the pluripotency of existing iPSCs and ES cells, including modulation of FGF/MEK/ERK signaling.

Main Results:

  • Inhibition of TGF-β signaling using SB431542 demonstrated the ability to substitute for Oct4 during the reprogramming of somatic cells into iPSCs.
  • Sustained inhibition of TGF-β signaling was shown to maintain the pluripotency of both iPSCs and ES cells.
  • TGF-β signaling inhibition was found to modulate the FGF/MEK/ERK signaling pathway, suggesting a mechanistic link.

Conclusions:

  • TGF-β signaling plays a previously unrecognized role in the generation and maintenance of pluripotent stem cells.
  • Inhibiting TGF-β signaling is a viable strategy to enhance reprogramming efficiency and sustain pluripotency in PSCs.
  • Targeting TGF-β signaling offers a novel approach for stem cell research and therapeutic applications.
Keywords:
ERKES CellInduced Pluripotent Stem Cell (iPSC)Oct4ReprogrammingTGF-β

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