氮氧自由基R-1对人肝细胞L-02的辐射防护作用

目的 探讨氮氧自由基R-1(简称R-1)对人肝细胞L-02的辐射防护作用.方法 在L-02细胞培养液中,加入终浓度为0、0.125、0.25、0.5、1、2、4、8、16、32μmol/L的R-1,作用24、48和72 h.用MTT法测定R-1的毒性作用,以筛选合适的R-1浓度.后续实验选择0.125、0.25、0.5、1 μmol/L 4个浓度组检测其防护作用.设终浓度4 mmol/L的细胞保护剂WR2721为阳性对照组.采用60Coγ射线照射,吸收剂量为0、1、2、4、8 Gy,照射72 h后,进行MTT比色法.L-02细胞分为2组:照射前30 min加药组和照射后立即加药组.终浓度均为0.25 μmol/L,吸收剂量为4 Gy,照射后72 h进行MTT比色实验.照射后10 d,用克隆形成实验检测不同浓度的R-1对L-02细胞活力的影响.选用防护效果最佳的0.25μmol/L浓度对细胞进行预处理,分别在4 Gy照射后的24、48和72 h,用倒置显微镜观察细胞形态的变化,Hoechst 33258荧光染色法和流式细胞仪检测细胞凋亡.结果 当R-1浓度低于1 μmoL/L时,与0 μmol/L组相比,L-02细胞各时间点的吸光度(A)值无明显变化;而浓度高于2 μmol/L时,与0 μmol/L组相比,其A值随浓度的增高而下降.选用0、0.125、0.25、0.5、1μmol/L的浓度组.与照射组相比,R-1各浓度组的A值和克隆形成率明显提高,其中0.25μmol/L组的作用最明显.与照射组相比,0.25 μmol/L预处理组的L-02细胞贴壁好,折光性强,轮廓清晰,凋亡细胞和死亡细胞明显较少.结论 R-1能有效地防护60Coγ射线对L-02细胞的辐射损伤,其防护作用可能与减少细胞凋亡有关.

Abstract：

Objcetive To investigate the protective effects of the nitroxides R-1 on human liver cells exposed to ionizing radiation.Methods Human liver cells L-02 were cultured and irradiated with 60Co γ-rays at the doses of 0,1,2,4,and 8 Gy,in order to screen the proper irradiation dose.WR2721 at the terminal concentration of 4 mmol/L was used as positive control.L-02 cells irradiated with 4 Gy were added with R-1 at the terminal concentration of 0.25 μmol/L at 30 min before irradiation or immediately after irradiation.MIT method was used to screen the proper conditions for follow-up experiment 72 h later.L-02 cell culture fluid was added with R-1 at the concentrations of 0,0.125,0.25,0.5,and 1 μmol/L,respectively for 30 min before irradiation at the doses of 0,1,2,4,and 8 Gy to ealculate clone formation rate at 10 d post-irradiation.L-02 cells were cultured and divided into 4 groups:control group without any treatment.drug group pretreated by 0.25 μmol/L R-1 only,irradiation group,irradiated at 4 Gy only,and drug + irradiation group with combination of 0.25 μmol/L R-01 and 4 Gy irradiation.The inverted microscopy and Hoechst 33258 staining and flow eytometry were used to observe the apoptosis of the cells at 24,48,and 72 h later.Results Nitroxides R-1 did not inhibit the viability of L-02 cell when its concentration was less than 1 μmol/L and it inhibited the L-02 cell growth when the concentration wu higher than 2 μmoL/L.The A value and colony formation rate of different concentration of R-1 groups were all higher than those of the irradiation group,and the effect of the 0.25 μmol/L drug concentration group was the most significant.Consequently,the concentration 0.25 μmoL/L was selected for follow-up experiment.Compared with the irradiation group,the L-02 cells of the pretreatment group showed solid adherence, increased refraction,clear outline,less apoptotic and dead cells at 4 Gy post-irradiation.Conclusions Nitroxides R-1 can protect the human liver cells from 60Coγ-ray induced injury effectively.The mechanism of its protective effect may be the reduction of apoptosis.     

神舟载人系列任务保障中空降医疗救护现状与对策

目的针对空降医疗救护组在载人航天飞行搜救过程中的卫勤保障现状和做法,分析探讨卫勤保障对策。方法根据以往载人神舟飞船的卫勤保障做法、经验及救护现状,进行回顾性总结并制订对策。结果针对保障现状,结合历次载人航天卫勤保障,总结出主要做法:(1)严格筛选素质过硬人员;(2)集体提升伞降训练技能;(3)不断强化培训急救技术;(4)逐步修订完善保障预案;(5)重点突出现场急救能力;(6)仔细进行检讨反思总结。同时提出4点对策:(1)建立常态化的空降医疗救护力量梯次培养制度;(2)形成合理化的载人航天急救卫生装备器材配置;(3)落实经常化的空降医疗救护人员考核奖惩机制'(4)探索实用化的载人航天搜救卫勤保障方式、模式。结论总结出的对策,对空降医疗救护组日后完成载人航天卫勤保障工作提供有益启示。     

氮氧自由基R-1对人肝细胞L-02的辐射防护作用

Objcetive To investigate the protective effects of the nitroxides R-1 on human liver cells exposed to ionizing radiation.Methods Human liver cells L-02 were cultured and irradiated with 60Co γ-rays at the doses of 0,1,2,4,and 8 Gy,in order to screen the proper irradiation dose.WR2721 at the terminal concentration of 4 mmol/L was used as positive control.L-02 cells irradiated with 4 Gy were added with R-1 at the terminal concentration of 0.25 μmol/L at 30 min before irradiation or immediately after irradiation.MIT method was used to screen the proper conditions for follow-up experiment 72 h later.L-02 cell culture fluid was added with R-1 at the concentrations of 0,0.125,0.25,0.5,and 1 μmol/L,respectively for 30 min before irradiation at the doses of 0,1,2,4,and 8 Gy to ealculate clone formation rate at 10 d post-irradiation.L-02 cells were cultured and divided into 4 groups:control group without any treatment.drug group pretreated by 0.25 μmol/L R-1 only,irradiation group,irradiated at 4 Gy only,and drug + irradiation group with combination of 0.25 μmol/L R-01 and 4 Gy irradiation.The inverted microscopy and Hoechst 33258 staining and flow eytometry were used to observe the apoptosis of the cells at 24,48,and 72 h later.Results Nitroxides R-1 did not inhibit the viability of L-02 cell when its concentration was less than 1 μmol/L and it inhibited the L-02 cell growth when the concentration wu higher than 2 μmoL/L.The A value and colony formation rate of different concentration of R-1 groups were all higher than those of the irradiation group,and the effect of the 0.25 μmol/L drug concentration group was the most significant.Consequently,the concentration 0.25 μmoL/L was selected for follow-up experiment.Compared with the irradiation group,the L-02 cells of the pretreatment group showed solid adherence, increased refraction,clear outline,less apoptotic and dead cells at 4 Gy post-irradiation.Conclusions Nitroxides R-1 can protect the human liver cells from 60Coγ-ray induced injury effectively.The mechanism of its protective effect may be the reduction of apoptosis.     

氮氧自由基R-1对人胃上皮细胞GES的辐射防护作用

目的探讨氮氧自由基R-1(下称R-1)对人胃上皮细胞GES电离辐射的防护作用。方法应用MTT法检测R-1对GES细胞24 h、48 h和72 h的毒性作用。给予0、1、2、4、8Gy的60Co-γ射线辐照后72 h和12 d分别采用MTT法和克隆形成实验,检测不同浓度R-1对GES细胞辐射防护作用。选取防护效果最佳的0.125μmol/L浓度组对GES细胞进行预处理,给予4Gy的60Co-γ射线照射后的24 h、48 h、72 h分别采用Hoechst33258荧光染色法和流式细胞仪观察GES细胞凋亡。结果与0μmol/L浓度组相比,当R-1的浓度低于1μmol/L时,GES细胞各时间点的吸光值无明显变化(P>0.05),而浓度高于2μmol/L时,其吸光值随浓度的增高下降(P<0.05)。选用0.1、0.125、0.25、0.5、1μmol/L的浓度组检测辐射防护作用,与0μmol/L组相比,R-1各浓度组的吸光值和克隆形成率提高(P<0.05)。故采用辐射防护效果最佳的0.125μmol/L浓度组处理后续实验,与照射组相比,药物+照射组的GES细胞数量明显增多、折光性强、轮廓清晰、微核和核碎裂数量减少、凋...     

超宽带电磁辐射对大鼠垂体和睾丸超微结构及性激素水平的影响

目的 观察超宽带(ultra-wideband,UWB)电磁辐射对大鼠垂体和睾丸超微结构以及血清中性激素水平的影响。方法 将SD雄性大鼠随机分为辐照组和对照组。辐照组大鼠接受脉冲数为30万次的UWB辐照,并于辐照后6、12、24、48 h,应用透射电子显微镜观察垂体及睾丸超微结构的改变,放射免疫法检测大鼠血清中睾酮(T)、黄体生成素(LH)及促卵泡激素(FSH)水平。结果 在辐照后各时间点,大鼠垂体和睾丸均出现不同程度的损伤。在辐照后24h,垂体和睾丸损伤程度最重。垂体嗜碱细胞内质网扩张,胞浆中有空泡,出现脂滴,淋巴细胞渗出,染色质边集;睾丸组织中,精原细胞、支持细胞和间质细胞均出现染色质边集、内质网扩张,毛细血管内皮细胞线粒体肿胀、空泡化,淋巴细胞渗出。辐照组血清中T水平在辐照后24、48 h分别为(1209.7±115.7)、(1340.5±331.1)μg/L,明显低于相应对照组f分别为(2721.8±178.9)、(2820.9±321.4) μg/L],差异均有统计学意义（P＜0.05）,而LH和FSH均未发生明显改变。结论 UWB电磁辐射可导致大鼠垂体和睾丸超微结构发生变化,对大鼠血清中T含量有一定程度的影响,可能是UWB辐照引起大鼠生殖系统发生改变的原因之一。     

依达拉奉联合叶酸、维生素E在急性缺血性脑卒中治疗中的效果

目的：探讨依达拉奉联合叶酸、维生素E对急性缺血性脑卒中（AIS）患者的治疗效果。方法：选取2021年9月至2022年6月于周口市惠济康复医院治疗的94例AIS患者，按随机数字表法划分成对照组和观察组，每组47例。所有患者均接受抗血小板治疗、改善微循环等常规治疗，对照组在此基础上应用叶酸、维生素E治疗，观察组在对照组基础上加用依达拉奉治疗，两组均连续治疗2周。比较两组患者治疗前及治疗2周后神经功能、血流变指标[血浆黏度、红细胞比容（HCT）、血小板聚集率]、血清同型半胱氨酸（Hcy）水平、炎症因子[超敏C反应蛋白（hs–CRP）、肿瘤坏死因子–α(TNF–α)]、血管内皮功能指标[一氧化氮（NO）、内皮素1(ET–1)]水平。结果：治疗2周后，两组患者血清Hcy水平及中国卒中量表（CSS）评分、血浆黏度、HCT、血小板聚集率、血清hs–CRP、TNF–α、ET–1水平均低于治疗前，且观察组均低于对照组；NO水平均高于治疗前，且观察组高于对照组，差异均具有统计学意义（P <0.05）。结论：对AIS患者实施依达拉奉联合叶酸、维生素E治疗，可明显减轻机体炎症反应，降低血清Hcy水平，改...