Purpose: We compared clonogenic activity in 27 manlike growth radiophone lines that depart in makeup after low-dose-rate (LDR) or high-dose evaluate (HDR) irradiation. We rhythmic status to LDR-induced redistribution in the radiophone wheel in octad of these radiophone lines.Methods and Materials: We rhythmic clonogenic activity after up to 96 hours of LDR (0.25 Gy/h) irradiation. We compared these with clonogenic activity after HDR irradiation (50 Gy/h). Using line cytometry, we rhythmic LDR-induced redistribution as a duty of instance during LDR irradiation in octad of these radiophone lines.Results: Coefficients that exposit clonogenic activity after both LDR and HDR irradiation segregate into quaternary sensitiveness groups that assort with radiophone genotype: organism (mut)ATM, wild-type TP53, mutTP53, and an unnamed factor in radioresistant glioma cells. The LDR and HDR sensitiveness correlates at modify doses (∼2 Gy HDR, ∼6 Gy LDR), but not at higher doses (HDR > 4 Gy; LDR > 6 Gy). The evaluate of LDR-induced expiration of clonogenic activity changes at roughly 24 hours; wild-type TP53 cells embellish more nonabsorptive and mutTP53 cells embellish more sensitive. Redistribution evoked by LDR irradiation also changes at roughly 24 hours.Conclusions: Radiosensitivity of manlike growth cells to both LDR and HDR irradiation is makeup dependent. Analysis of coefficients that exposit cancellated sensitiveness segregates 27 radiophone lines into quaternary statistically crisp groups, apiece associating with limited genotypes. Changes in cancellated sensitiveness and redistribution in the radiophone wheel are strongly instance dependent. Our accumulation found a genotype-dependent time-dependent help that predicts clonogenic survival, explains the oppositeness dose-rate effect, and suggests doable clinical applications. (Source: International Journal of Radiation Oncology * Biology * Physics)

Tags: ATM, glioma