Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Interaction of Microtubule-associated Protein 1B Light Chain(MAP1B-LC1) and p53 Represses Transcriptional Activity of p53

  • Kim, Jung-Woong (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Lee, So-Youn (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Jeong, Mi-Hee (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Jang, Sang-Min (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Song, Ki-Hyun (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Kim, Chul-Hong (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Kim, You-Jin (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University) ;
  • Choi, Kyung-Hee (Laboratory of Molecular Biology, Department of Life Science, College of Natural Sciences, Chung-Ang University)
  • Published : 2008.06.30
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Abstract

The tumor suppressor and transcription factor p53 is a key modulator of cellular stress responses, and can trigger apoptosis in many cell types including neurons. In this study, we have shown that Microtubule-associated protein 1B(MAP1B) light chain interacts with tumor suppressor p53. MAP1B is one of the major cytoskeletal proteins in the developing nervous system and essential in forming axons during elongation. We also demonstrate that both p53 and MAP1B-LC1 interact in the nucleus in HEK 293 cells. Indeed, we show that the MAP1B-LC1 negatively regulates p53-dependent transcriptional activity of a reporter containing the p21 promoter. Consequently, MAP1B light chain binds with p53 and their interaction leads to the inhibition of doxorubicin-induced apoptosis in HEK 293 cells. Furthermore, these examinations might be taken into consideration when knock-down of MAP1B-LC1 is used as a cancer therapeutic strategy to enhance p53's apoptotic activity in chemotherapy.

Keywords

References

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