一次性使用滴定管式输液器组织相容性和致畸毒性研究

目的 评价一次性使用滴定管式输液器组织相容性和致畸毒性,为医疗产品安全应用提供依据.方法 对一次性使用滴定管式输液器产品进行细胞毒性试验、豚鼠迟发型接触性致敏试验、皮肤刺激试验以评价其组织相容性,进行染色体畸变试验和微核试验以评价其致畸毒性.结果 一次性使用滴定管式输液器无细胞毒性、不会致敏和引起皮内刺激,无遗传毒性(不会引起染色体畸变),无诱导骨髓多染红细胞微核发生率增高作用.结论 一次性使用滴定管式输液器组织相容性良好、无致畸毒性.     

生物样品中氚的前处理装置的设计

目的 为监测生物样品中氚,设计一套前处理装置,并进行性能评估.方法 使用标准氚水拟合探测效率的标准曲线.利用高、中、低3种不同活度标准氚水和3H-TdR,分别测定自由水氚和有机氚的前处理化学回收率,并对3种生物样品中氚进行比对测量.结果 拟合的标准曲线可以用于环境中氚放射性测量,氚的仪器探测效率为23.3%.该装置在处理加标样的40.0 g的大米样品时,对标准氚水和3H-TdR平均化学回收率为95.4%,重复性较好.本单位和江苏省辐射环境监测管理站的生物样品比对测量结果分别为小麦1.74和1.80 Bq/kg,紫菜3.44和2.50 Bq/kg,茶叶3.28和5.50 Bq/kg,比对结果接近.结论 设计的前处理装置可以用于环境生物样品中有机氚的测量.

Abstract：

Objective To design a new pre-treatment device and to evaluate its efficiency in order to monitor the tritium levels in biological samples.Methods The detection efficiency of tritium was determined with standard tritiated water.Recovery of tritiated water and organically bound tritium (OBT) were detected with high, medium and low activities of standard tritiated water and 3H-TdR (tritiated thymidine), respectively.Comparison of three kinds of biological samples using different pre-treatment devices was shown.Results The standard curve can be used in environmental tritium measurement and the detection efficiency for tritium was 23.3%.When 40.0 g rice with standard HTO or 3H-TdR was pretreated with this device, the average recovery of HTO and OBT was about 95.4% , which showed good reproducibility.The comparison results were similar.Conclusions The pre-treatment device can be used to survey the OBT in environmental biological samples.     

低剂量Χ射线诱导NK细胞增殖治疗白血病裸鼠的实验研究

目的 通过NK细胞分离液直接分离得到小鼠NK细胞,探讨低剂量辐射诱导的NK细胞增殖对K562细胞白血病模型是否有杀伤作用.方法 采用流式细胞术和3H-TdR掺人法分别检测低剂量(照射剂量在20 cGy以内的低LET或5 cGy以内的高LET射线)对NK细胞增殖及活性的影响;流式细胞术检测外周血CD13+细胞表达,ELISA法检测外周血TNF-α含量;体内实验观测实验组和对照组NK细胞输入后裸鼠外周血白细胞计数、肝脏、脾脏及肾脏指数等改变.结果 分离得到的NK细胞纯度达(82.54±0.18)%.80 mGy照射后24 h,NK细胞增殖指数达到最高,为(36.31±1.32)%(t=24.69,P＜0.05);低剂量照射后NK细胞杀伤K562活性为(12.59±0.63)%(t=6.63,P＜0.05),其抑制率为29.52%.结论 低剂量辐射诱导的NK细胞增殖输入对裸鼠白血病的发生发展具有明显的抑制作用.

Abstract：

Objective To separate NK cells of mice from NK cell separation medium and study inhibitory effect of proliferated NK cell induced by low dose radiation on the leukemia model of K562 cells.Methods Flow cytometry and 3H-TdR methods were respectively used to measure proliferation index and activity of NK cells treated with low-dose radiation( which means exposure dose in 20 cGy low LET beam or 5 cGy high LET beam).CD13 + cells were measured by flow cytometry and TNF-α content in blood-serum was detected by ELISA.In vivo,peripheral blood leucocyte count,index of liver,indexes of spleen and kidney were observed in control group and experimental group.Results The purity of NK cell separation was (82.54 ± 0.18)%.The proliferation index of NK cells at 24 hours after 80 mGy irradiated was 36.31 ± 1.32% ,(t =24.69,P ＜0.05).Killing activity of NK cell induced by low dose radiation to K562 cell was (12.59±0.63)%(t=6.63,P＜0.05)and the inhibition ratio was 29.52%.Conclusion The injection of proliferated NK cell induced by low dose radiation demonstrated significant inhibitory effect on the growth of leukemia nude mouse.     

低强度微波对γ射线辐射的防护作用及其可能机制

目的 研究低强度微波对受γ射线照射小鼠的辐射防护作用及其可能机制.方法 96只雄性昆明种小鼠随机分为对照组、微波照射组(微波组,120μW/cm2,900 MHz,比吸收率为0.4 W/kg)、电离组(5 Gy γ射线照射)及微波与γ射线复合照射组(复合组,120μW/cm2微波+5 Gy γ射线照射),每组24只.微波组与复合组小鼠先接受功率密度为120 μW/cm2的微波照射,1 h/d,持续14 d,第15天给予电离组和复合组5 Gy 60Co γ射线一次性全身照射.于照射后3、6、9及12 d处死动物,固定胸骨及脾脏,作病理观察,流式细胞仪检测受照射小鼠的脾细胞凋亡率,同时测定血清中抗氧化酶和脂质过氧化物水平.结果 骨髓病理切片显示,单独γ射线与复合照射均可导致骨髓组织经历典型的凋亡坏死、空虚、再生修复和恢复4个阶段的病理改变,但复合组的病变轻于电离组,恢复也更快;脾损伤病变过程与骨髓造血组织基本相似,复合组病变轻于电离组.流式细胞仪结果 显示,照后6、9 d复合组脾细胞凋亡率(分别为23.02%±15.18%、25.37%±11.62%)明显低于电离组,差异有统计学意义(P<0.05);氧化损伤检测表明,复合组照后3、9、12 d血清中超氧化物歧化酶(SOD)活力较电离组明显升高,6、9、12d丙二醛(MDA)含量明显降低,差异均有统计学意义(P<0.05).结论 特定强度的微波辐射具有一定的辐射防护作用,其作用机制可能与抑制辐射诱导的造血细胞凋亡和抗氧化损伤作用有关.     

LyGDI真核表达载体构建及稳定转染A549细胞株的建立

目的构建Rho蛋白鸟苷解离抑制因子（LyGDI）真核表达载体并建立稳定转染A549细胞株。方法PCR扩增LyGDI基因片段,构建pEGFP-C1-LyGDI真核表达载体,经酶切、PCR、测序验证其正确性。脂质体法转染真核细胞A549,G418筛选建立稳定转染的细胞株,RT-PCR、免疫印迹检测稳定转染的细胞株。结果构建了真核表达载体并建立了稳定转染的A549细胞株,成功表达LyGDI蛋白。结论LyGDI真核表达载体成功构建及稳定转染A549细胞株的建立,为研究LyGDI过度表达对肿瘤侵袭性和转移的影响奠定了实验基础。