首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
目的研究结核分枝杆菌Ag85B-Esat6-HspX融合基因的免疫原性。方法将40只BALB/c小鼠随机分成4组,NS组、BCG组、pcDNA-HspX组和pcDNA-Ag85B-Esat6-HspX组,每组10只。BCG组只在0周时皮内注射卡介苗1次。NS组、pcDNA-HspX组及融合基因组分别于0、2、4周肌肉注射生理盐水和重组质粒DNA,共免疫3次。在免疫的第2周,4周及最后一次免疫后2周检测体血清中的总IgG水平。同时,最后一次免疫后2周,取脾细胞检测细胞免疫反应。结果构建的融合基因重组质粒DNA免疫动物后能产生针对结核杆菌特定抗原的特异性细胞免疫和体液免疫应答,具有较强的免疫原性。结论结核分枝杆菌Ag85B-Esat6-HspX融合基因可作为DNA疫苗进行保护作用的研究。  相似文献   

2.
江山  朱道银  蒋英  骆旭东  陈全 《医学争鸣》2003,24(21):1973-1975
目的:构建结核分枝杆菌分泌蛋白Ag85B-Ag85A融合基因及其双价抗原真核表达载体.方法:采用gene SOE-ing法将Ag85B和Ag85A编码基因用疏水甘氨酸接头(Gly4Ser)3行PCR扩增融合,经限制性内切酶消化后克隆入pcDNA3.1( )中构建真核表达质粒pCDAg85B-A,酶切、DNA测序鉴定,用脂质体法将pCDAg85B-A转染COS-7细胞,采用RT-PCR,ELISA方法检测其表达.结果:Ag85B-Ag85A融合基因定向克隆人pcDNA3.1( ),双向测序表明碱基无突变,Ag85B-Ag85A融合基因在真核细胞中能表达.结论:成功构建结核分枝杆菌分泌蛋白Ag85B-Ag85A融合基因及其双价抗原真核表达载体,为结核病基因疫苗的研究奠定基础.  相似文献   

3.
目的: 构建融合表达结核分枝杆菌(Mycobacterium tuberculosis, MTB)分泌蛋白Ag85B-ESAT6真核表达载体,研究该重组载体在体外的表达和在小鼠体内诱生体液免疫应答的能力. 方法: 设计含不同酶切位点的Ag85B和ESAT6引物,采用PCR的方法从MTB毒株H37Rv-DNA中分别扩增出相应大小的DNA片段,将片段分别与pGEM-T-easy载体连接后测序. 将测序正确的Ag85B和ESAT6按照不同的酶切位点克隆入真核表达载体pcDNA3,挑选出阳性克隆,分别命名为AZ-pcDNA3-EF和EZ-pcDNA3-AF,将重组质粒电转CHO细胞,RT-PCR检测融合蛋白mRNA的表达,间接免疫荧光测定CHO细胞内融合蛋白的表达;用重组质粒免疫BALB/c小鼠,ELISA测定特异性抗体的滴度. 结果: PCR获得的Ag85B和ESAT6序列与GenBank报道的一致. RT-PCR可检测融合基因转录出mRNA,转染重组质粒的CHO细胞内有较强的免疫荧光,AZ-pcDNA3-EF质粒免疫小鼠血清特异性抗体滴度为1∶ 1000,EZ-pcDNA3-AF质粒免疫小鼠血清特异性抗体滴度为1∶ 1500. 结论: Ag85B和ESAT6融合基因真核表达载体构建成功,有望为结核病的预防提供有效的基因疫苗.  相似文献   

4.
目的:构建E.coli.-BCG(Bacille Calmette-Guerin)穿梭载体,在母牛分枝杆菌细胞壁融合表达结核分枝杆菌(MTB)的分泌蛋白Ag85B-ESAT-6.方法:用聚合酶链反应(PCR)]从MTB毒株H37Rv基因中扩增出结核分枝杆菌19000抗原(19-ss)胞壁区及其上游调控元件基因,克隆入E.coli.-BCG穿梭载体pOLYG中,构建表达蛋白能嵌入细胞壁中的E.coli.-BCG穿梭载体.用间接免疫荧光染色法观察该载体携带所构建的结核分枝杆菌分泌蛋白Ag85B和ESAT-6基因在母牛分枝杆菌宿主中的融合表达.  相似文献   

5.
结核分枝杆菌Ag85B-MPT64融合基因的构建表达   总被引:5,自引:0,他引:5  
骆旭东  陈全  蒋英  江山  朱道银 《医学争鸣》2003,24(12):1088-1090
目的:构建结核分枝杆菌(H37Rv)Ag85B-MPT64融合基因并在真核细胞中表达.方法:采用序贯PCR(geneSOEing)法将Ag85B和MPT64编码基因用疏水甘氨酸接头(Gly4Ser)3经PCR扩增融合,定向克隆入pcDNA3.1( )中。采用脂质体转染法将pcDNA/Ag85B—MPT64(pcDNA/AM)转染COS-7细胞,用RT-PCR、ELISA和斑点印迹法检测其表达。结果:Ag85B-MPT64融合基因经双向DNA序列测定,碱基突变率为0.11%(2/1707),突变为无意义突变;重组质粒转染COS-7细胞后经检测证实,该融合基因能在真核细胞中表达。结论:成功地构建了Ag85B-MPT64融合基因并在真核细胞中表达,融合蛋白具有良好的抗原性。  相似文献   

6.
目的:构建结核分枝杆菌Ag85B和MPT64编码基因的共表达载体pBud85B-MPT.方法:将结核分枝杆菌Ag85B、MPT64基因同时克隆进多启动子共表达载体pBudCE4.1中,得到真核共表达质粒pBud85B-MPT;将pBud85B-MPT转染COS-7细胞,通过RT-PCR方法检测目的基因的表达.结果:在COS-7细胞中同时检测到Ag85B、MPT64的表达.结论:pBud85B-MPT共表达质粒构建成功,为进一步研究新型结核病疫苗奠定基础.  相似文献   

7.
结核分枝杆菌esat6-cfp10融合基因疫苗的构建及表达   总被引:4,自引:1,他引:4  
目的:构建结核分枝杆菌esat6-cfp10融合基因疫苗并对其在体外进行表达。方法:用PCR技术从MTB毒株H37Rv基因组DNA中扩增cfp10基因,以Hindm和EcoR Ⅰ双酶切后克隆人含esat6基因的pGEM-7zf( )载体中,将测序正确的esat6-cfp10融合基因按照BamH Ⅰ和EcoR Ⅰ酶切位点亚克隆人真核表达载体pcDNA3.1( ),重组质粒酶切鉴定正确后以脂质体转染CHO细胞,分别以RT—PCR方法检测mRNA表达和间接免疫荧光技术检测目的蛋白的表达.结果:PCR获得的cfp10基因序列与献报道一致,大小约为350bp.重组真核表达质粒酶切后可获得约630bp的融合esat6-cfp10基因片段.RT—PCR可获得大小约为350bp的诉CFP10基因,间接免疫荧光检测后表达有Esat6-Cfp10蛋白的阳性细胞着染.结论:成功克隆结核分枝杆菌CFP10基因,构建了融合有esat6-cfp10基因的真核表达质粒并对其在体外进行了表达。  相似文献   

8.
目的:构建结核分枝杆菌Rv2389基因真核表达载体.方法:PCR扩增Rv2389基因,测序正确后克隆入真核表达载体pCDNA3.1(-),重组质粒酶切鉴定正确后以阳离子聚合物转染CHO细胞后, 分别以RT-PCR方法检测mRNA表达和间接免疫荧光技术检测目的蛋白的表达.结果:构建了重组质粒pCDNA- Rv2389, RT-PCR结果证明Rv2389可在CHO细胞中转录,间接免疫荧光检测证明,表达有Rv2389蛋白的细胞着染.结论:成功构建了结核分枝杆菌Rv2389基因的真核表达载体pCDNA-Rv2389,Rv2389基因可以在CHO细胞中表达.  相似文献   

9.
目的构建结核分枝杆菌Ag85B、TB10.4及Ag85B-TB10.4融合表达载体,并进行抗原的生物信息学分析,为候选疫苗筛选奠定基础。方法从结核分枝杆菌H37Rv菌株中分别扩增出Ag85B基因,TB10.4基因,Ag85B-TB10.4;将Ag85B克隆入pET-28a(+)表达载体中,将TB10.4和Ag85B-TB10.4分别克隆入pET-SUMO表达载体中。上述重组质粒转化入大肠埃希杆菌BL21菌中(DE3),经IPTG诱导表达,并对其进行生物信息学分析。结果 (1)成功将结核分枝杆菌Ag85B和TB10.4,Ag85B-TB10.4基因分别克隆入pET28a(+)和pET-SUMO表达载体中,经IPTG诱导蛋白表达后,对经超声裂解的菌液上清进行SDSPAGE电泳,表明获得了与预期蛋白大小一致的表达产物,重组融合蛋白pET-SUMO-Ag85B-TB10.4蛋白分子质量约为54kDa。(2)生物信息学分析显示Ag85B-TB10.4融合蛋白具有多个潜在抗原位点。结论成功构建了重组质粒pET-28a-Ag85B,pET-SUMO-TB10.4和pET-SUMO-Ag85B-TB10.4,并获得了Ag85B,TB10.4和Ag85B-TB10.4的可溶性原核表达产物;生物信息学分析在Ag85B与TB10.4蛋白加入一段蛋白linker后蛋白的亲水性增强,抗原决定簇面积增大,为后续的功能实验研究奠定了基础。  相似文献   

10.
分泌性表达融合蛋白85B-ESAT-6重组卡介苗的构建和表达   总被引:2,自引:0,他引:2  
目的构建分泌性表达融合蛋白85B-ESAT-6重组卡介苗。方法PCR扩增结核分枝杆菌热休克蛋白60(hsp60)的调控序列和合成T4转录终止序列,分别定向克隆入pBCG2000载体的多克隆位点的上下游,得到E.coli-Mycobacterium穿梭载体质粒pBCG3000。PCR分别扩增出结核分枝杆菌分泌性抗原Ag85B的全编码序列及ESAT-6基因,然后将两基因融合插入pBCG3000载体的hsp60启动子下游得到pBCG3000-85B-ESAT-6分泌性表达质粒。用电穿孔法将pBCG3000-85B-ESAT-6质粒转化BCG细胞,得到重组卡介苗。重组卡介苗经热诱导后,SDS-PAGE电泳和Westernblotting鉴定融合蛋白85B-ESAT-6的表达及其免疫学活性。结果通过PCR、酶切以及测序鉴定,pBCG3000-85B-ESAT-6表达质粒构建完全正确,SDS-PAGE电泳未能直接观察到表达的融合蛋白条带,用ESAT-6蛋白的多抗血清通过Westernblotting证实了该蛋白主要分泌性表达于胞外并具有免疫学活性。结论分泌性表达融合蛋白85B-ESAT-6重组卡介苗构建成功。  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.
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   

13.
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   

14.
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   

15.
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   

16.
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   

17.
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   

18.
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   

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   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号