Journal of Radiation Protection and Research

The Korean Association for Radiation Protection (대한방사선방어학회)
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Effect of Cytosine Arabinoside, 3-Aminobenzamide and Hydroxyurea on the frequencies of radiation-induced micronuclei and aneuploidy in human lymphocytes

DNA 회복 저해제 Cytosine Arabinoside, 3-Aminobenzamide 및 Hydroxyurea가 방사선에 의해 유도된 소핵과 이수성에 미치는 영향

  • Cho, Yoon-Hee (School of Public Health and institute of Health and Environment, Seoul National University) ;
  • Kim, Yang-Jee (School of Public Health and institute of Health and Environment, Seoul National University) ;
  • Kang, Chang-Mo (Korea Institute of Radiological and Medical Sciences) ;
  • Ha, Sung-Whan (College of Medicine, Seoul National University) ;
  • Chung, Hai-Won (School of Public Health and institute of Health and Environment, Seoul National University)
  • Published : 2005.12.30
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Abstract

This study was carried out to examine the effect of the DNA repair inhibitors, Cytosine Arabinoside(Ara C), 3-Aminobenzamide(3AB) and Hydroxyurea(HU) on the frequencies of radiation-induced micronuclei(MNi) and aneuploidy. Irradiated lymphocytes(1-3Gy) were treated with DNA repair inhibitors, Ara C, 3AB and HU for 3 hours and CBMN assay - FISH technique with DNA probe for chromosome 1 and 4 was performed. The frequencies of x-ray induced MNi and aneuploidy of chromosome 1 and 4 were increased in a dose-dependent manner. Ara C, 3AB and HU enhanced the frequencies of radiation-induced MNi and the frequencies of radiation-induced aneuploidy of chromosome 1 and 4 were enhanced by HU and Ara C while no effect was observed by 3AB. The frequency of radiation-induced aneuploidy of chromosome 1 was higher than that of chromosome 4. These results suggest that there are different mechanisms involved in the formation of MNi and aneuploidy by radiation.

소핵분석은 방사선의 생물학적 선량계로서 활용되고 있으나 이의 생성 기전은 아직까지 확실치 않다. 본 연구에서는 사람 림프구에 방사선을 조사한 후 DNA 손상회복 저해물질, Cytosine Arabinoside(Ara C)와 3-Aminobenzamide(3-AB) 그리고 Hydroxyurea(HU)를 특정 세포주기에 처리하고 소핵분석과 FISH기법을 이용하여 방사선에 의한 소핵 및 이수성의 정도를 구명하고자 하였다. 방사선 선량에 따라 소핵과 이수성의 빈도는 양반응 관계를 보이며 증가하였고 DNA 손상회복 저해물질 처리 후 소핵의 빈도는 모든 DNA 손상 회복 저해물질에 의해 증가하였으며 Ara C, 3AB, HU 순으로 나타났다. 이수성의 빈도는 HU와 Ara C에 의해서 크게 증가하였으나, 3AB는 아무런 영향을 주지 않았다. 또한 1번 염색체가 4번 염색체보다 방사선에 의한 소핵형성 및 이수성에 더 많이 관여되었다. 본 연구 결과, 방사선에 의한 소핵 및 이수성의 형성 과정은 여러 다른 기전이 관여하고 있음을 알 수 있었다.

Keywords

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