Experimental therapeutic effect of combined cytokines on beagle dogs exposed to 4.5 Gy γ-rays

Objective To evaluate the effects of combined administration of recombinant human interleukin-11(rhIL-11),recombinant human G-CSF(rhG-CSF)and recombinant human interleukin-2 (rhIL-2)on acute radiation sickness(ARS)beagles.Methods Sixteen beagle were irradiated with 4.5 Gy60 Co γ-rays to establish ARS models,and were divided into irradiation control group,supportive care group and combined cytokines treatment group.After irradiation irradiation control group was given no treatment,the dogs in supportive care group received purely symptomatic treatment,while combined cytokines treatment group received rhIL-11 50μg/(kg·d)and rbG-CSF 10μg/(kg·d)subcutaneously(0-14 d)and rhIL-2 1×1 06 U/d(29-43 d)besides symptomatic treatment.Manifestation and characteristics of ARS beagles were observed,and the survival time were recorded.At last,post-mortem examination and histological examination were performed.Results All animals underwent nausea,diarrhea and fever.After irradiation,all animals in irradiation control group died in two weeks,and the mean survival time was 12.7 d,while only one died at 33 d in supportive care group.All dogs in combined cytokine group survived at 45 day after exposure,and their haematopoiesis and gastrointestinal tract were recovered.Conclusions Combination of rhIL-11 + rhG-CSF + rhIL-2 treatment could be significantly effective on ARS beagles irradiated by 4.5 Gy60 Co γ-rays,which could accelerate injured haemotopoiesis and intestinal tract recovery,increase the survival rate and improve the life quality of animals.     

Initial research of screening for the differentially expressed proteins in beagles irradiated with 4.5 Gy60 CO γ-rays by two-dimensional gel electrophoresis and mass spectrometry

Objective To explore the mechanisms of cytokines on acute radiation disease in irradiated beagles.Methods The sera of beagles irradiated with 4.5 Gy γ-rays with cytokines treatment was collected at different time points post irradiation.The two-dimensional gel electrophoresis(2-DE)was used to isolate and compare the differentially expressed proteins in sera.HD-MS was used to analyze the differentially expressed proteins with significance,and the amino acid sequences should be determined. Results High resolution 2-DE gel map was obtained.There were six differentially expressed proteins in sera of irradiated beagles at different time points.Four protein spots were successfully identified by MS.A significant spot was identified as serum amyloid A(SAA)by HD-MS,with relative molecular mass of 13 077 and isoelectfie point of 6.26.Expression of SAA was not found 1 d pre-irradiation and 36 d postirradiation,but increased slightly 1 d(0.2166)and significantly 14 d post-irradiation(0.4577). Conclusions The expression of serum amyloid A was consistent with the process of acute radiation injury,which might indicate the turnover of the disease.     

Clotting mechanism in beagles irradiated by 4.5 Gy γ-rays

Objective To explore the clotting mechanism in beagles irradiated by 4.5 Gy γ-rays after treatment with supportive care,or supportive care and combined cytokines.Methods Sixteen beagles were divided into irradiation control group,Supportive care group and combined cytokines treatment group.Platelet aggregation test,thrombelagtography (TEG) and the time measurement were analyzed in vitro.Results In irradiation group and supportive care group,the platelet aggregation rates in beagles were decreased markedly and the k value of TEG was increased 7 d post-irradiation,while those indexes in combined cytokines treatment group changed little.At 14 d post-irradiation,each parameter of TEG in irradiated group changed obviously.The values of r,k,r+k and M were elevated significantly,clotting time and the maximum coagulation time of thrombus delayed,the Ma value was decreased markedly,and the maximum elasticity amplitude of thrombus was diminished.All parameters in combined cytokines treatment group were better than those in supportive care group.The thrombin time was prolonged obviously in irradiated group 14 d post-irradiation,while the thrombin time was the longest at 2-3 weeks post irradiation in supportive care group and combined cytokines treatment group(P>0.05).Conclusions Cytokines could improve the platelet aggregation and the blood clotting functions of beagles suffering from acute radiation sickness.     

喹硫平与利培酮治疗老年精神分裂症对照研究

目的探讨喹硫平对老年首发精神分裂症的临床疗效及安全性。方法6例首发老年精神分裂症患者随机分成两组,分别给与喹硫平与利培酮治疗8周,用阳性和阴性症状量表（PANSS）和副反应量表（TESS）评定疗效和不良反应。结果两组疗效相当（P〉0．05）,喹硫平不良反应显著少于利培酮（P〈0．05）。结论喹硫平对老年精神分裂症安全有效。     

内源性抑郁症生物学病因研究进展

目前,内源性抑郁症在医学上被理解为一种综合征,病人表现为抑郁心境、兴趣丧失、食欲下降、体质量减轻、早醒以及情感的昼夜变化。内源性抑郁症可能存在着某些生物学上的变化,受某些因素诱发,但病情呈自主性,病前病人有稳定的性格,需要积极地治疗,电休克、抗抑郁剂治疗有良好的效果。近几年来,国外对内源性抑郁症的病因研究越来越多。     

丝素蛋白材料细胞相容性的研究

目的：研究再生丝素膜对大鼠真皮细胞生长和细胞遗传学的影响。方法：采用静置贴壁培养法在再生丝素膜上培养大鼠真皮细胞，并用活细胞计数法和常规染色体检测技术，观察再生丝素膜对细胞生长和染色体的影响。结果 再生丝素膜能支持细胞正常生长，呈现正常的生长繁殖曲线且染色体的形态和数目正常。结论 再生丝素膜对大鼠真皮细胞具有良好的细胞相容性。     

F1t3/FL结构、功能及对脐血造血干/祖细胞体外扩增作用的研究

Flt3是主要表达于造血干/祖细胞上的一种Ⅲ型酪氮酸激酶受体,Flt3配基(FL)是一种早期造血生长因子,与造血凋控密切相关.FL在脐血造血干/祖细胞体外扩增中发挥重要作用,并具有其他方面的功能.本文就Flt3/FL的结构、功能及其在脐血造血干/祖细胞体外扩增中的作用作一综述.     

ING4基因真核表达载体的构建及其功能

目的：构建真核表达载体pcDNA3.0-ING4,观察ING4基因对人肝癌SMMC7721细胞周期及凋亡的影响。方法：小鼠肝组织经RT-PCR扩增,构建真核表达载体pcDNA3.0-ING4,分别用双酶切、PCR、基因测序进行鉴定,将其转导进入人肝癌SMMC7721细胞,检测ING4基因的表达情况及其对细胞周期的影响,应用荧光显微镜和激光扫描共聚焦显微镜观察细胞凋亡情况。结果：RT-PCR产物为约750bp的条带,基因测序正确,转导进入人肝癌细胞株SMMC7721后可延长G2期,其凋亡率（23.66％）明显高于对照组（13.75％）。结论：成功分离得到了小鼠ING4基因并成功构建真核表达载体pcDNA3.0-ING4,该质粒转染人肝癌SMMC7721细胞后可延长G2期并可促使细胞凋亡。     

重组腺病毒Ad-ING4和Ad-PTEN对肝癌细胞的抑制作用

 [摘要] 目的：用构建好的重组腺病毒Ad-ING4和Ad-PTEN感染人肝癌SMMC-7721细胞,检验对细胞的作用。方法：用构建好的重组腺病毒Ad-ING4和Ad-PTEN感染QBI-293A细胞,对病毒进行扩增并测定其效价,荧光显微镜下观察感染效果。用扩增得到的Ad-ING4和Ad-PTEN感染SMMC-7721细胞,流式细胞术及MTT检测作用效果。结果：空腺病毒组的凋亡率为3.4±1.3%,Ad-ING4组和Ad-PTEN组分别为49.7±4.8%和11.4±3.2%,均显著高于空腺病毒组（p＜0.01）;Ad-ING4组和Ad-PTEN组的细胞增殖在48h～96h时较正常组明显下降（p＜0.05）。结论：Ad-ING4和Ad-PTEN对SMMC-7721细胞均有显著抑制作用, 尤其是Ad-ING4。     

人抑瘤素M基因重组逆转录病毒载体的构建及鉴定

目的构建携带人Oncostatin M（OSM，抑瘤素M）基因的逆转录病毒载体。方法用DNA重组技术，以pcDNA3．1finyc-his（-）A-hOSM重组质粒为模板PCR扩增人OSM基因，酶切连接到带有GFP标记的逆转录病毒载体pEGZ／MCS．HA上，连接产物转化大肠杆菌DH5a，筛选阳性克隆，抽提质粒，用PCR法、限制性内切酶EeoRI和BamHI双酶切法及测序鉴定。然后以脂质体转染法，将重组的逆转录病毒载体与辅助质粒HIT456、HIT60共同转染入包装细胞系293T以包装病毒。结果构建了重纽人抑瘤素M基因逆转录病毒载体，PCR产物电泳可见约750bp处有特异性条带，EcoRI和BamH，双酶切，电泳出现两个条带，约750bp处亦有相应条带。核酸测序结果与GenBank中所报道的人抑瘤素M基因的CDS序列完全一致。转染293T细胞在倒置荧光显微镜下可见绿色荧光，且细胞有病变。提示构建携带人OSM基因的逆转录载体成功。结论携带人抑瘤素M基因的重组逆转录病毒载体pEGZ／MCS-HA-hOSM成功构建为此基因的临床应用和实验研究奠定了基础。