|Title||Acceleration of atherogenesis in ApoE-/- mice exposed to acute or low-dose-rate ionizing radiation|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2015|
|Authors||Mancuso, Mariateresa, Pasquali Emanuela, Braga-Tanaka, III I., Tanaka S., Pannicelli A., Giardullo Paola, Pazzaglia Simonetta, Tapio S., Atkinson M.J., and Saran Anna|
|Keywords||animal experiment, animal model, animal tissue, aorta atherosclerosis, apolipoprotein E, article, atherogenesis, atherosclerosis, atherosclerotic plaque, controlled study, descending aorta, Female, gamma radiation, gelatinase B, in vivo study, Ionizing radiation, Long term exposure, low energy radiation, macrophage, mouse, nonhuman, radiation dose, Radiation exposure, radiation hazard, radiation response, smooth muscle fiber, thoracic aorta|
There is epidemiological evidence for increased non-cancer mortality, primarily due to circulatory diseases after radiation exposure above 0.5 Sv. We evaluated the effects of chronic low-dose rate versus acute exposures in a murine model of spontaneous atherogenesis. Female ApoE-/- mice (60 days) were chronically irradiated for 300 days with gamma rays at two different dose rates (1 mGy/day; 20 mGy/day), with total accumulated doses of 0.3 or 6 Gy. For comparison, age-matched ApoE-/- females were acutely exposed to the same doses and sacrificed 300 days post-irradiation. Mice acutely exposed to 0.3 or 6 Gy showed increased atherogenesis compared to age-matched controls, and this effect was persistent. When the same doses were delivered at low dose rate over 300 days, we again observed a significant impact on global development of atherosclerosis, although at 0.3 Gy effects were limited to the descending thoracic aorta. Our data suggest that a moderate dose of 0.3 Gy can have persistent detrimental effects on the cardiovascular system, and that a high dose of 6 Gy poses high risks at both high and low dose rates. Our results were clearly nonlinear with dose, suggesting that lower doses may be more damaging than predicted by a linear dose response.
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