Adaptive response and split-dose effect of radiation on the survival of mice |
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Authors: | Ashu?Bhan Tiku Email author" target="_blank">R?K?KaleEmail author |
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Institution: | (1) Free Radical Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, 110 067 New Delhi, India |
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Abstract: | Although the importance of radiation-induced adaptive response has been recognized in human health, risk assessment and clinical
application, the phenomenon has not been understood well in terms of survival of animals. To examine this aspect Swiss albino
mice were irradiated with different doses (2–10 Gy) at 0015 Gy/s dose rate and observed on a regular basis for 30 days. Since
almost 50% lethality was seen with 8 Gy, it was selected as the challenging dose for further studies. Irradiation of mice
with conditioning doses (0.25 or 0.5 Gy) and subsequent exposure to 8 Gy caused significant increase in the survival of mice
compared to irradiated control. The splitting of challenging dose did not influence the efficiency of conditioning doses (0.25
Gy and 0.5 Gy) to induce an adaptive response. However conditioning doses given in fractions (0.25 Gy + 0.25 Gy) or (0.5 Gy
+ 0.5 Gy) were able to modulate the response of challenging dose of 8 Gy. These results clearly showed the occurrence of adaptive
response in terms of survival of animals. The conditioning dose given in small fractions seemed to be more effective. The
findings have been discussed from a mechanistic point of view. The possible biological implications, potential medical benefits,
uncertainties and controversies related to adaptive response have also been addressed |
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Keywords: | Adaptive response low dose radiation survival |
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