Significant Suppression of CT Radiation-Induced DNA Damage in Normal Human Cells by the PrC-210 Radioprotector

摘要

While computed tomography (CT) is now commonly used and considered to be clinically valuable, significant DNA doublestrand breaks (gamma-H2AX foci) in white blood cells from adult and pediatric CT patients have been frequently reported. In this study to determine whether gamma-H2AX foci and X-ray-induced naked DNA damage are suppressed by administration of the PrC-210 radioprotector, human blood samples were irradiated in a CT scanner at 50-150 mGy with or without PrC-210, and gamma-H2AX foci were scored. X-ray-induced naked DNA damage was also studied, and the DNA protective efficacy of PrC-210 was compared against 12 other common "antioxidants." PrC-210 reduced CT radiation-induced gamma-H2AX foci in white blood cells to near background (P 0.0001) at radiation doses of 50-150 mGy. PrC-210 was most effective among the 13 "antioxidants" in reducing naked DNA X-ray damage, and its addition at 30 s before an (OH)-O-center dot pulse reduced to background the (OH)-O-center dot insult that otherwise induced 95% DNA damage. A systemic PrC-210 dose known to confer 100% survival in irradiated mice had no discernible effect on micro-CT image signal-to-noise ratio and CT image integrity. PrC-210 suppressed DNA damage to background or near background in each of these assay systems, thus supporting its development as a radioprotector for humans in multiple radiation exposure settings. (C) 2018 by Radiation Reward' Society