Focus formation of DNA repair proteins in normal and repair-deficient cells irradiated with high-LET ions

被引:80
作者
Karlsson, KH [1 ]
Stenerlöw, B [1 ]
机构
[1] Uppsala Univ, Div Biomed Radiat Sci, Dept Oncol Radiol & Clin Immunol, Rudbeck Lab, SE-75185 Uppsala, Sweden
关键词
D O I
10.1667/RR3171
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
To investigate the repair of clustered lesions within the DNA/chromatin, the focus formation and persistence of foci of the phosphorylated histone protein H2AX and the repair protein MRE11 were studied in normal cells and in cells lacking DNA-PKcs (M059J) or ATM (GM2052D) after irradiation with high-LET nitrogen ions or low-LET photons. There was a rapid formation of MRE11 and gamma-H2AX foci, and 0.5 h after high-LET irradiation, the number of foci in normal cells correlated well with the number of particle hits per cell nucleus. After 8 h of repair, there were significantly more gamma-H2AX foci than MRE11 foci remaining in the normal cells, independent of radiation quality. The difficulty in repairing clustered breaks was detected as slower rejoining of DSBs (measured by DNA fragmentation analysis), as quantification of the amount of gamma-H2AX over time, and as a larger fraction of repair foci remaining after 24 It in cells irradiated with high-LET ions. These data indicate that clustered lesions are repaired by a pathway involving the same proteins that repair sparsely distributed breaks. Further, for both low- and high-LET radiation, no reduction of the initial number of gamma-H2AX and MRE11 foci was detected in M059J cells up to 21 h after irradiation, which was in accordance with a complete absence of DSB rejoining in these cells. In the GM2052D cells there was also a higher level of foci remaining after 21 h; however, this was not accompanied by unrejoined DSBs, indicating that these foci not only represent DSBs but also may be a sign of persistent problems even when breaks are rejoined. (C) 2004 by Radiation Research Society.
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页码:517 / 527
页数:11
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