PMID: 8946030Nov 4, 1996Paper

Two types of X-ray-induced radioresistance in mice: presence of 4 dose ranges with distinct biological effects

Mutation Research
M YonezawaY Hosokawa

Abstract

Preirradiation with 0.05 Gy of X rays 2 months before a second exposure to a mid-lethal dose significantly enhanced the survival rate in both female and male ICR strain mice. The radioresistance was observed between 2-2.5 months after exposure to 0.05 Gy. It did not appear within 1.5 months, and disappeared after 3 months. This radioresistance was induced only by whole-body preirradiation (not by partial irradiation of the head or the trunk). On the other hand, preirradiation with 0.30 Gy as well as 0.50 Gy resulted in radioresistance 2 weeks later, but not 2 months later. The radioresistance was induced by whole-body preirradiation or partial preirradiation of the trunk. No radioresistance was evident after exposure of intermediate preirradiation doses of 0.15 and 0.20 Gy administered before 2 months and 2-5 weeks, respectively. The present and previous results show that the biological effects of ionizing radiation may be distinguished with the following four radiation dose ranges; (1) below 0.025 Gy: no radioresistance after 2 months; (2) 0.05-0.10 Gy: significant radioresistance after 2-2.5 months; (3) 0.20 Gy: no radioresistance after 2-5 weeks; and (4) 0.30-0.50 Gy or more: significant radioresistance after 2 weeks. These ...Continue Reading

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