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1.
目的进一步了解汉滩病毒核蛋白氨基端的抗原特性. 方法构建汉滩病毒S基因5端311 bp片段的原核表达载体,并诱导表达和纯化了Mr 3.6×104的融合蛋白(汉滩病毒核蛋白氨基端Mr 1.0×104与Mr 2.6×104 GST融合);用mAb,以Western-blot和ELISA方法对该蛋白的抗原位点进行了鉴定. 结果与完整核蛋白反应的mAb中仅有部分与Mr 3.6×104融合蛋白反应,而与核蛋白氨基端Mr 2.6×104片段反应的5株mAb(1A8,A35,8E8,3A9,3G11)都能与Mr 3.6×104融合蛋白反应. 结论汉滩病毒核蛋白氨基端Mr 1.0×104以内存在一个或几个线性表位,而羧基端可能主要起着维持完整核蛋白立体构象的作用,并影响识别立体表位的mAb与该蛋白的结合.  相似文献   

2.
李新红  杨为松 《医学争鸣》1997,18(3):256-258
提高汉滩病毒核蛋白的表达量,进一步研究核蛋白的功能,并利用其建立HFRS的血清学诊断方法。利用已有的含PRPL启动子的汉滩病毒核蛋白编码区的表达载体-S22,通过酶切和连接的方法,将汉滩病毒S片段核蛋白的编码区基因插入融合蛋白表达载体pGEX-4T-1和GST基因的3’末端,构建了一种表达核蛋白的融合质粒-pTHanS。结果;经薄层扫描仪扫描,pTHanS核蛋白的表达量占细胞总蛋白量的32%。并对  相似文献   

3.
目的:在本室前期工作的基础上构建汉滩病毒M基因G2片段与S基因0.7kb片段嵌合基因的重组腺病毒.方法:构建含有汉滩病毒G2S0.7嵌合基因的转移载体pShuttle-G2S0.7,然后通过特异性的酶切将嵌合基因与腺病毒DNA相连,电转化E.coli JM109并用PCR方法进行筛选和鉴定,获得重组腺病毒Adeno-G2S0.7DNA,转染HEK293细胞得到重组腺病毒.进一步对重组腺病毒滴度和表达产物进行鉴定.结果:构建了含G2S0.7嵌合基因重组腺病毒,滴度可达10^13~10^15pfu/L;该重组腺病毒感染HEK293细胞后,表达出可被抗汉滩病毒核蛋白及糖蛋白G2的特异性单抗(mAb)所识别的融合蛋白.结论:利用腺病毒表达系统,成功地表达同时具有核蛋白及糖蛋白G2生物学活性的融合蛋白G2S0.7,为进一步研究其免疫学特性奠定了基础.  相似文献   

4.
张芳琳  徐志凯  阎岩  白文涛  吴兴安  罗雯  赵茜 《医学争鸣》2001,22(14):1287-1289
目的 在本室前期工作的基础上,进一步进行汉坦病毒S基因0.7kb片段的真核表达及基因免疫的研究。方法 构建汉坦病毒76-118株S基因5'端700bp片段的真核表达载体pcDNA3.1-S0.7,脂质体转染COS-7细胞,免疫荧光检测表达结果;用该质粒免疫BALB/c小鼠,并用免疫荧光法及ELISA法检测免疫的体液免疫应答效果。结果 免疫荧光检测结果表明,目的基因在COS-7细胞中获得瞬时表达;用pcDNA3.1-S0.7基因免疫小鼠可引起抗汉坦病毒核蛋白(NP)特异性的抗体应答。结论 汉坦病毒S基因0.7kb片段可刺激机体产生特异的抗汉坦病毒体液免疫应答。为进一步进行细胞免疫反应的检测及基因疫苗的研究提供实验基础。  相似文献   

5.
原核表达汉滩病毒囊膜糖蛋白G1和G2的免疫学特性   总被引:2,自引:2,他引:0  
目的 研究大肠杆菌表达的汉滩病毒囊膜糖蛋白G1和G2的免疫原性和免疫保护作用。方法 将大肠杆菌表达的G1和G2免疫小白鼠,测定免疫小鼠血清中汉滩病毒抗体的间接免疫荧光抗体和中和抗体滴度并利用被动免疫保护试验观察G1和G2免疫小鼠血清和脾细胞对汉滩病毒致死性感染乳鼠的保护作用。结果 表达G1和G2免疫小鼠血清中抗汉滩病毒抗体的滴度分别为1:160,1:320;G1,G2共同免疫不能提高免疫效果;NP  相似文献   

6.
目的 探讨新型呼肠病毒R4株S片段免疫小鼠后引发的免疫应答。方法 构建4个不同S基因节段的重组真核表达质粒,并免疫小鼠;ELISA检测血清以研究R4特异性抗体升高水平,并对其抗体亚型进行鉴定;ELISPOT检测小鼠淋巴细胞INF-γ的表达情况。结果 与对照组相比,4个重组质粒免疫的小鼠血清都有明显的R4特异性抗体升高,尤其以S1和S3基因免疫后抗体水平较高,且均以IgG2a占绝对优势;S1基因免疫组小鼠的细胞免疫应答最强。结论 S1基因重组质粒免疫小鼠后可同时引发较强的体液免疫和细胞免疫应答,是较为理想的疫苗备选基因片段。  相似文献   

7.
0 引言 汉滩病毒属布尼亚病毒科汉坦病毒属,主要引起人类肾综合征出血热,我国是肾综合征出血热发生和流行的主要疫区. 故寻找安全有效、低廉的疫苗是控制本病流行和发生的关键[1],基因免疫是将编码外源蛋白的核酸表达质粒直接转化到机体,以激发机体产生针对外源蛋白的特异性免疫应答的过程. 由于基因免疫具有同时激发机体的体液免疫和细胞免疫的特点,操作简单,成本低廉, 特别适合传染病的预防和治疗. 本研究将汉滩病毒S片段编码区基因(核蛋白编码区基因)插入到真核表达载体pVR1012中,成功地构建了重组表达质粒pVRS22, 并用该质粒进行了体外非洲绿猴肾传代细胞Vero-E6细胞的瞬时转染.  相似文献   

8.
SARS病毒N蛋白真核表达质粒构建及诱导的体液免疫   总被引:2,自引:0,他引:2  
目的构建SARS病毒核衣壳蛋白(N)的真核表达质粒,并研究其在小鼠体内诱导的体液免疫应答。方法采用PCR方法体外扩增SARS病毒N蛋白基因片段,定向克隆入真核表达栽体pVAC,构建pVAC-N重组质粒;大量制备该重组质粒,经基因枪腹部皮内注射免疫BALB/c小鼠三次,间接ELISA法测定免疫鼠IgG抗体效价。结果成功构建了重组表达质粒pVAC-N,免疫小鼠后可诱导产生出特异性的IgG抗体。结论构建的真核表达质粒pVAC-N能诱导小鼠产生特异性抗体,为SARS疫苗的进一步研究打下基础。  相似文献   

9.
SARS病毒S1蛋白N端片段在大肠杆菌中的表达、纯化与鉴定   总被引:1,自引:0,他引:1  
目的:获得纯化的重组SARS病毒S1蛋白N端部分,研究其与机体产生针对SARS病毒免疫应答的规律和机制.方法:将编码SARS病毒S1蛋白N端334个氨基酸残基的基因进行克隆,并在原核表达系统中表达,获得了纯化的重组蛋白.利用SARS患者恢复期已知的SARS抗体阳性血清,鉴定纯化的重组S1蛋白片段.结果:克隆表达的重组蛋白基因序列与公布的SARS病毒S1蛋白N端的基因序列相同,所表达的重组蛋白相对分子质量约为64 000.3份SARS患者恢复期的血清均与重组蛋白反应,在相对分子质量64 000处形成特异性的反应条带,而来自SARS流行前的正常人对照血清则不能与重组蛋白反应.结论:获得的重组蛋白与SARS病毒抗体呈现特异性的反应,为进一步研究SARS病毒感染免疫应答机制和制备SARS病毒的重组疫苗奠定基础.  相似文献   

10.
目的构建以SARS冠状病毒(severe acutere spiratory syndrome coronavlrus,SARs.c0V)S蛋白3个保守片段基因的组合为抗原基因DNA疫苗,采用肌肉注射的方法接种小鼠后观察机体产生免疫应答的情况。方法将人工合成的S蛋白3个保守片段基因组合(称为Sa)克隆至真核表达载体pcDNA3、1(-),随之将重组质粒进行小鼠肌肉免疫,定期检测血清中抗SARS—CoV的病毒特异性抗体水平,流式细胞仪观察其淋巴细胞表型变化,PCR法检测质粒分布,免疫组化检测抗原表达。结果疫苗注射后15d就能在血清中检测出病毒特异性抗体,并且疫苗能在机体中持续表达抗原引发机体持续的免疫应答,直到注射后45d免疫应答都不见减弱;以CTLT淋巴细胞为主的CD8+T淋巴细胞的百分比含量增加极显著,引起强大的体液免疫和细胞免疫;而空载体质粒对照组未检测出明显的特异性免疫应答。结论以S蛋白3个保守片段基因组合为抗原基因的DNA疫苗通过肌注能诱导小鼠针对SARS病毒强大的免疫应答。  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  相似文献   

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