Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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INVOLVEMENT OF p27CIP/KIP IN HSP25 OR INDUCIBLE HSP70 MEDIATED ADAPTIVE RESPONSE BY LOW DOSE RADIATION

  • Seo, Hang-Rhan (Laboratory of Radiation Effect and Korea Institute of Radiological and Medical Sciences) ;
  • Chung, Hee-Yong (Department of Microbiology, College of Medicine, Hanyang University) ;
  • Lee, Yoon-Jin (Laboratory of Radiation Effect and Korea Institute of Radiological and Medical Sciences) ;
  • Baek, Min (Atomic Energy Policy Division, Atomic Energy Bureau, Ministry of Science and Technology) ;
  • Bae, Sang-Woo (Laboratory of Radiation Effect and Korea Institute of Radiological and Medical Sciences) ;
  • Lee, Su-Jae (Laboratory of Radiation Experimental Therapeutics, Korea Institute of Radiological and Medical Sciences) ;
  • Lee, Yun-Sil (Laboratory of Radiation Effect and Korea Institute of Radiological and Medical Sciences)
  • Published : 2006.04.01
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Abstract

Thermoresistant (TR) clones of radiation-induced fibrosarcoma (RIF) cells have been reported to show an adaptive response to 1cGy of low dose radiation, and HSP25 and inducible HSP70 are involved in this process. In this study, to further elucidate the mechanism by which HSP25 and inducible HSP70 regulate the adaptive response, HSP25 or inducible HSP70 overexpressed RIF cells were irradiated with 1cGy and the cell cycle was analyzed. HSP25 or inducible HSP70 overexpressed cells together with TR cells showed increased G1 phase after 1cGy irradiation, while RIF cells did not. $[^3H]-Thymidine$ and BrdU incorporation also indicated that both HSP25 and inducible HSP70 are involved in G1 arrest after 1cGy irradiation. Molecular analysis revealed upregulation of p27Cip/Kip protein in HSP25 and inducible HSP70 overexpressed cells, and cotransfection of p27Cip/Kip antisense abolished the induction of the adaptive response and 1cGy-mediated G1 arrest. The above results indicate that induction of an adaptive response by HSP25 and inducible HSP70 is mediated by upregulation of p27Cip/Kip protein, resulting in low dose radiation-induced G1 arrest.

Keywords

References

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