低氧联合辐照对小鼠骨髓造血细胞的影响作用研究  

Effects of combined hypoxia and irradiation on mouse bone marrow hematopoietic cells

作　　者：杨欣海 陈芳[1] 全勇 胡梦佳 芦玉凯 陈乃成 许杨[1] 王崧[1] 王军平[1] YANG Xinhai;CHEN Fang;QUAN Yong;HU Mengjia;LU Yukai;CHEN Naicheng;XU Yang;WANG Song;WANG Junping(Department of Anti-Radiation Medicine,State Key Laboratory of Trauma and Chemical Poisoning,Institute of Combined Injury,Faculty of Military Preventive Medicine,Army Medical University(Third Military Medical University),Chongqing,China)

机构地区：[1]陆军军医大学(第三军医大学):军事预防医学系防原医学教研室,全军复合伤研究所,创伤与化学中毒全国重点实验室,重庆

出　　处：《陆军军医大学学报》2025年第7期681-690,共10页Journal of Army Medical University

基　　金：国家自然科学基金重点项目(82430103)。

摘　　要：目的探究高原低氧环境联合辐照损伤对小鼠骨髓造血细胞的影响。方法165只C57BL/6雄性小鼠(10~12周,体质量20~25 g)按随机数字表法进行分组:正常对照组(Control组,n=33)、6 Gy单纯辐照组(6 Gy组,n=43)、6 Gy低氧辐照组(Hy-7 d+6 Gy组,n=43),7 Gy单纯辐照组(7 Gy组,n=12)、7 Gy低氧辐照组(Hy-7 d+7 Gy组,n=12)、7 Gy持续低氧治疗组(Hy-7 d+7 Gy+Hy组,n=12)、6 Gy持续低氧治疗组(Hy-7 d+6 Gy+Hy,n=10);Hy-7 d+6 Gy组、Hy-7 d+7 Gy组、Hy-7 d+7 Gy+Hy组、Hy-7 d+6 Gy+Hy组于常压低氧舱内进行7 d预处理(氧浓度12%),其余组小鼠在正常氧环境中饲养;6 Gy、Hy-7 d+6 Gy组、Hy-7 d+6 Gy+Hy组小鼠在低氧预处理结束后进行^(60)COγ射线全身一次性辐照6 Gy;7 Gy、Hy-7 d+7 Gy组、Hy-7 d+7 Gy+Hy组小鼠在低氧预处理结束后进行^(60)COγ射线全身一次性辐照7 Gy;Control组、6 Gy组、7 Gy组小鼠全程正常氧环境饲养,Hy-7 d+7 Gy组、Hy-7 d+6 Gy组小鼠辐照损伤后继续低氧饲养24 h后恢复正常氧环境饲养,Hy-7 d+7 Gy+Hy组、Hy-7 d+6 Gy+Hy组小鼠辐照后持续低氧环境饲养。Control、6 Gy、Hy-7 d+6 Gy组小鼠制备骨髓细胞悬液,采用全自动细胞计数仪计数小鼠骨髓有核细胞数量,采用HE染色观察小鼠骨髓腔病理形态改变,采用流式细胞术检测造血干/祖细胞(Lin^(-)Sca1^(+)c-Kit^(+),LSK)、髓系祖细胞(myeloid progenitor,MP)以及成熟T/B髓系细胞数量;7 Gy、Hy-7 d+7 Gy、Hy-7 d+7 Gy+Hy组小鼠从低氧预处理后开始持续监测30 d的生存率;6 Gy、Hy-7 d+6 Gy、Hy-7 d+6 Gy+Hy组小鼠采取尾血,使用全自动血液分析仪检测红细胞(red blood cell,RBC)、白细胞(white blood cell,WBC)、血红蛋白(hemoglobin,HGB)、血小板(platelet,PLT)等的动态变化;Control、6 Gy、Hy-7 d+6 Gy组小鼠于辐照后17 d处死后获取骨髓细胞悬液并进行单细胞测序及分析。结果①与Control组相比,6 Gy组小鼠辐照后全骨髓有核细胞数量显著减少(P<0.01),HE染色显示骨髓血窦扩张�Objective To determine the effects of hypoxia pre-treatment combined with radiation damage on the hematopoietic cells in the bone marrow of mice.Methods A total of 165 male C57BL/6 mice(10~12 weeks old,weighing 20~25 g)were randomly divided into 7 groups:normal control(Control,n=33),6 Gy irradiation(6-Gy,n=43),7 d hypoxia-6 Gy irradiation(Hy-7 d+6 Gy,n=43),7 Gy irradiation(7 Gy,n=12),7 d hypoxia-7 Gy irradiation(Hy-7 d+7 Gy,n=12),7 Gy continuous hypoxia treatment(Hy-7 d+7 Gy+Hy,n=12),and 6 Gy continuous hypoxia treatment(Hy-7 d+6 Gy+Hy,n=10).The mice of the hypoxia treatment groups were given 7-day hypoxic pretreatment(12%oxygen)in a normobaric hypoxic chamber,while those of the other groups were housed in normoxic condition.After pretreatment,the mice of the irradiation groups were exposed to a single 6 or 7 Gy of whole-body^(60)COγ-irradiation in normoxia.The mice of the hypoxia and irradiation groups were kept in hypoxic condition in 24 h post-irradiation followed by being resumed to normoxia,while those of the continuous hypoxia treatment groups were remained in hypoxia.After bone marrow cell suspensions were prepared from the Control,6 Gy,and Hy-7 d+6 Gy groups,bone marrow nucleated cells(BMNCs)were counted via automated cell counter.HE staining was employed to observe pathologic changes in medullary cavity,and flow cytometry was used to assess Lin^(-)Sca1^(+)c-Kit^(+)(LSK)hematopoietic stem/progenitor cells,myeloid progenitors(MPs),and mature T/B/myeloid cells.The mice of the 7 Gy,Hy-7 d+7 Gy,and Hy-7 d+7 Gy+Hy groups were monitored for 30-day survival after hypoxic pretreatment.The dynamic changes in the counts of red blood cells(RBC),white blood cells(WBC)and platelets(PLT),and hemoglobin(HGB)level were observed in the 6 Gy,Hy-7 d+6 Gy,and Hy-7 d+6 Gy+Hy groups with aid of a fully automatic blood analyzer.Single-cell RNA sequencing was performed on bone marrow cell suspension derived from the mice euthanized in 17 d after irradiation from the Control,6 Gy,and Hy-7 d+6 Gy groups.Results①Compared to the

关 键 词：低氧预处理 骨髓造血干/祖细胞 急性放射损伤 造血功能 单细胞转录组技术 

分 类 号：R331.22[医药卫生—人体生理学] R339.54[医药卫生—基础医学] R363.121