Journal
RADIATION PROTECTION DOSIMETRY
Volume 99, Issue 1-4, Pages 197-198Publisher
NUCLEAR TECHNOLOGY PUBL
DOI: 10.1093/oxfordjournals.rpd.a006760
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Endpoints related to cell cycle perturbations were investigated in human primary fibroblasts irradiated with 1-4 Gy of either protons (7.7 and 28.5 keV.mum(-1)) or X rays. Regardless of the quality of radiation, 8 h after irradiation cells accumulated in the G2 Phase, but such accumulation Was maintained at 24 It front treatment only in 28.5 keV.mum(-1) protons. A marked G1/S-transition block was observed in proton as well as in X ray-treated cultures up to 2 4 h, with doses as low, as I Gy. On the other hand, the number of cells positive to p21 antibody reaction was higher after proton than after X ray treatment, indicating that the 'complexity' of lesions may play a critical role in the induction of p21.
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