More efficient induction of genotoxicity by high-LET Fe-particle radiation than low-LET X-ray radiation at low doses

作     者：Bing Wang Takanori Katsube Kaoru Tanaka Yasuharu Ninomiya Hirokazu Hirakawa Cuihua Liu Kouichi Maruyama Masahiro Murakami Tetsuo Nakajima Akira Fujimori Mitsuru Nenoi Bing Wang;Takanori Katsube;Kaoru Tanaka;Yasuharu Ninomiya;Hirokazu Hirakawa;Cuihua Liu;Kouichi Maruyama;Masahiro Murakami;Tetsuo Nakajima;Akira Fujimori;Mitsuru Nenoi

作者机构：National Institutes for Quantum Science and TechnologyChiba263-8555Japan 

出 版 物：《Radiation Medicine and Protection》 (放射医学与防护（英文）)

年 卷 期：2023年第4卷第1期

页      面：11-18页

核心收录：

学科分类：1004[医学-公共卫生与预防医学(可授医学、理学学位)] 100402[医学-劳动卫生与环境卫生学] 10[医学] 

基　　金：This research was financially supported in part by the Ministry of Education Culture Sports Science and Technology(MEXT)Grant-in-Aid for Scientific Research on Innovative Areas Grant Number 15H05935“Living in Space”and Research Project Grants(22B-258 and 14J-286)with Heavy Ions at HIMAC QST Japan. 

主　　题：Fe-particle radiation Genotoxicity Genomic instability Micronucleated erythrocyte C57BL/6J mice 

摘      要：Objective:To understand differential effects on induction of genotoxicity and genomic instability(GI)by high-LET particle radiation and low-LET photon radiation,based on ground-based experiments using total body irradiation(TBI)of mice with Fe-particle radiation and X-ray radiation.Methods:TBI was delivered to C57BL/6J Jms strain female mice of 8 weeks old at a dose ranging from 0.1 to 3.0 Gy of Fe-particle radiation or at a dose ranging from 0.1 to 5.0 Gy of X-ray radiation.Induction of genotoxicity and GI by TBI was determined respectively at 1 and 2 months after exposure using frequency of micronuclei in bone marrow erythrocytes as the endpoint.Inhibition of bone marrow cell proliferation by TBI was measured as reduced erythropoiesis.Physiological conditions were also investigated.Results:TBI,regardless of the type of radiation,caused statistically significant increase in genotoxicity at 1 month after exposure,but did not induce GI at 2 months after exposure even at higher doses(1.0 Gy).The doseresponse curve for the frequency of micronucleated polychromatic erythrocytes induced by Fe-particle radiation and X-ray radiation was y=0.7798 t 1.7889x–0.5978x^(2)(R^(2)=0.8109)and y=0.7421 t 1.3792x–0.2588 x^(2)(R^(2)=0.8081),respectively.The dose-response curve for the frequency of micronucleated normochromatic erythrocytes induced by Fe-particle radiation and X-ray radiation was y=0.7191 t 1.4545x–0.4978x^(2)(R^(2)=0.7047)and y=0.658 t 1.344x–0.2531x^(2)(R^(2)=0.7853),respectively.In general,high-LET Fe-particle radiation was more efficient in inducing genotoxicity than low-LET X-ray radiation at lower doses(0.5 Gy).Conclusions:These results further confirm that exposure to TBI,even at higher doses and regardless the type of radiation,does not induce GI in C57BL/6J strain mice measured as increased micronuclei in bone marrow erythrocytes.These findings indicate that radiation-induced GI is mouse strain dependent and suggest that more comprehensive studies should be done to explore the late health consequences from exposure to high-LET radiation at low doses.