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Translationally controlled tumor protein (TCTP) downregulates Oct4 expression in mouse pluripotent cells

Xiang Cheng1, Junhua Li, Jie Deng

  • 1Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

BMB Reports
|January 28, 2012
PubMed

Insights

Translationally controlled tumor protein (TCTP) downregulates Oct4 expression in mouse pluripotent stem cells. This protein suppresses Oct4 transcription, reducing stem cell pluripotency by binding to the Oct4 promoter region.

Area of Science:

  • Stem Cell Biology
  • Molecular Biology
  • Gene Regulation

Background:

  • Oct4 is a key transcription factor essential for maintaining pluripotency in embryonic stem cells.
  • Translationally controlled tumor protein (TCTP) is implicated in various cellular processes, but its role in stem cell regulation is less understood.

Purpose of the Study:

  • To investigate the regulatory role of TCTP in Oct4 expression within mouse pluripotent stem cells.
  • To determine the impact of TCTP on stem cell pluripotency and Oct4 promoter activity.

Main Methods:

  • Quantitative analysis of TCTP mRNA levels in somatic versus pluripotent cells.
  • Overexpression and knockdown studies of TCTP in mouse embryonic carcinoma P19 and embryonic stem (ES) J1 cells.
  • Reporter assays to assess Oct4 promoter activity.
  • Site-directed mutagenesis to identify functional domains of TCTP.

Main Results:

  • Endogenous TCTP mRNA levels were significantly lower in pluripotent cells compared to somatic cells.
  • TCTP overexpression reduced Oct4 transcription and diminished stem cell pluripotency.
  • The N-terminal region of TCTP (amino acids 1-60) was critical for suppressing Oct4 promoter activity.
  • TCTP suppressed Oct4 promoter activity in a dose- and time-dependent manner.
  • TCTP knockdown led to increased Oct4 expression.

Conclusions:

  • TCTP acts as a negative regulator of Oct4 expression in mouse pluripotent cells.
  • TCTP downregulates Oct4 by binding to the Sf1 site on the Oct4 promoter.
  • TCTP plays a crucial role in modulating stem cell pluripotency through Oct4 regulation.

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