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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Translationally controlled tumor protein (TCTP) downregulates Oct4 expression in mouse pluripotent cells

  • Cheng, Xiang (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University) ;
  • Li, Junhua (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University) ;
  • Deng, Jie (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University) ;
  • Li, Zhenzhen (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University) ;
  • Meng, Shuyan (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University) ;
  • Wang, Huayan (Department of Animal Biotechnology, College of Veterinary Medicine, Northwest A&F University)
  • Received : 2011.07.20
  • Accepted : 2011.10.06
  • Published : 2012.01.31
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Abstract

The present study aimed to investigate the function of translationally controlled tumor protein (TCTP) in the regulation of Oct4 in mouse embryonic carcinoma P19 cells and mouse J1 embryonic stem (ES) cells. The mRNA level of endogenous TCTP in somatic cells was 2-4 folds higher than that in pluripotent P19 and J1 ES cells. Overexpression of TCTP in mouse pluripotent cells not only reduced the level of Oct4 transcription, but also decreased the pluripotency of stem cells. The N-terminal end of TCTP (amino acids 1-60) played an important role in suppressing the Oct4 promoter. Moreover, overexpression of TCTP in P19 cells suppressed the Oct4 promoter activity in a dose- and a time-dependent manner. In addition, knockdown of TCTP by small interfering RNA increased the expression of Oct4. Our study indicates that TCTP downregulates the Oct4 expression by binding the Sf1 site of Oct4 promoter in mouse pluripotent cells.

Keywords

References

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