mFISH ANALYSIS OF IRRADIATED HUMAN FIBROBLASTS: A COMPARISON AMONG RADIATIONS WITH DIFFERENT QUALITY IN THE LOW-DOSE RANGE.

The present investigation aimed to characterise the shape of dose-response curve and determining the frequency distribution of various aberration types as a function of dose and radiation quality in AG01522 primary human fibroblasts in the 0.1- to 1-Gy dose range. For this purpose, the cells were irradiated with 7.7 and 28.5 keV A mu m(-1) low-energy protons, 62 keV A mu m(-1 4)He(2+) ions (LNL Radiobiology facility) or X rays and samples collected for 24-colour mFISH analysis. X rays and 7.7 keV A mu m(-1) protons displayed a quadratic dose-response curve solely for total and simple exchanges, whereas for high-linear energy transfer radiations, a linear dose-response curve was observed for all the aberration categories, with the exception of complex exchanges.