Abstract
To assess the DNA damage induced by MBRT and BB radiations on glioma cells. The analysis of fluorescent intensity emitted per nucleus was plotted versus DNA content 2 and 17h after irradiations. At around cell-doubling time (17h) after exposures, the remaining DNA radiation damage could be correlated with cellular death. A higher γH2AX IF intensity per cell could be detected 2 and 17h after MBRT when compared with BB. 17h after MBRT, misrepaired damaged cells remained arrested in both G1 and G2 phases. A pronounced G2 phase arrest was detected at 17h after MBRT and BB. However, only after MBRT, a dose-dependent increasing number of damaged cells appeared arrested also in the G1 phase, and a higher amount of cells more prone to undergo apoptosis were detected. The threshold dose required to enhance the effectiveness of both synchrotron radiation techniques was 12Gy.
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