幽门螺杆菌UreB核酸疫苗的构建

目的:构建含幽门螺杆菌(Helicobacter pylori,Hp)尿素酶B亚单位(UreB)基因的核酸疫苗.方法:抽提Hp标准菌株CCUG17874基因组DNA,应用PCR技术从基因组DNA扩增UreB基因,克隆入PUCmT载体,检测UreB基因序列.经过一系列酶切、连接反应将其克隆入真核表达载体pIRES,转入感受态大肠杆菌DH5α,筛选阳性克隆,通过PCR和酶切反应进行鉴定.通过脂质体法将构建好的重组载体pIRES-UreB转染COS-7细胞,Western印迹分析检测pIRES-UreB表达UreB蛋白的免疫原性.结果:扩增出长约1 700 bp的UreB基因,与基因库Hp UreB序列一致,PCR和酶切鉴定结果证实成功构建了含UreB基因的Hp核酸疫苗pIRES-UreB,并且Western 印迹分析检测到特异性的蛋白条带.结论:构建了具有免疫反应性UreB基因的Hp核酸疫苗,为进一步探索其免疫作用奠定了基础.     

幽门螺杆菌中性粒细胞激活蛋白DNA疫苗的构建及其免疫保护作用

目的:构建携带幽门螺杆菌中性粒细胞激活蛋白(Hp neutrophil-activating protein,Hp-NAP)基因(napA)活减毒鼠伤寒沙门菌重组DNA疫苗,初步观察其对慢性Hp感染的免疫保护作用.方法:应用基因工程技术扩增全长napA,测序并经同源性分析后,将其亚克隆入真核表达载体pIRES,鉴定正确后将重组质粒转化活减毒鼠伤寒沙门菌构建Hp-NAP口服DNA疫苗.口服Hp-SS1建立SS1长期感染小鼠模型,30周后随机均分为3组,每组各5只.治疗组予109cfu/0.4 ml疫苗菌灌胃,1次/周×3周;2个对照组分别予等体积生理盐水或空白质粒.末次免疫4周后行快速尿素酶检测,ELISA测定血清抗体效价.结果:重组真核表达质粒pIRES-napA成功转化活减毒鼠伤寒沙门菌SL7207;所克隆napA与GenBank中SS1-na-pA核苷酸和蛋白质的同源性均＞98%.免疫后4周治疗组75%(3/4)小鼠快速尿素酶检测阴性,对照组均阳性,差异显著(P＜0.05);治疗组血清抗Hp-NAP抗体效价明显升高.结论:成功构建了具有较好免疫保护作用的Hp-NAP口服重组DNA疫苗,为进一步研制多价抗Hp核酸疫苗奠定了基础.     

表达幽门螺杆菌UreB减毒鼠伤寒沙门氏菌对小鼠的免疫保护作用

[目的]构建表达幽门螺杆菌(Helicobacterpylori,Hplori)尿素酶B亚单位(UreB)减毒鼠伤寒沙门氏疫苗菌,研究其对小鼠抗H.pylori的免疫保护作用.[方法]用PCR扩增ureB,将其克隆入高效原核表达质粒pTrc99A,进行基因测序,重组质粒鉴定后导入减毒鼠伤寒沙门氏菌SL261.用SDS聚丙烯酰胺凝胶电泳、Westernblot和薄层扫描进行目的蛋白表达分析.C57BL/6小鼠用重组菌免疫,4周后用H.pyloriSS1攻击,再4周后处死小鼠,取胃做快速尿素酶试验和H.pylori定量培养,对照观察免疫效果.[结果]构建了携带ureB的重组原核表达质粒pTrc99A-ureB,并将它成功转化了减毒鼠伤寒沙门氏菌SL261.重组菌SL3261(pTrc99A-ureB)表达了约66ku的UreB.与对照组比,重组菌免疫组H.pylori定植水平明显下降(P＜0.05).[结论]构建了表达H.pyloriUreB的重组减毒鼠伤寒沙门氏疫苗菌,该菌株对C57BL/6有免疫保护作用.     

人CTLA-4Ig融合基因减毒鼠伤寒沙门菌真核表达载体的构建及表达

目的构建能稳定表达人CTLA4 Ig融合基因的减毒鼠伤寒沙门菌真核表达载体,探讨其在哺乳动物细胞中的表达并对表达产物进行鉴定。方法用touchdown PCR法扩增CTLA-4 Ig融合基因,将PCR产物连接真核表达载体pcDNA3.1( ),构建pcDNA3.1( )-CTLA-4 Ig,用电穿孔仪转入减毒鼠伤寒沙门菌SL7207。将表达质粒转染COS-7细胞,SDS-PAGE、W estern b lot检测转染细胞裂解上清中目的蛋白的表达。结果酶切鉴定和基因序列测定显示重组质粒构建成功。在pcDNA3.1( )-CTLA-4 Ig质粒转染后48 h细胞裂解上清中,检测到CTLA-4 Ig融合蛋白的表达,该蛋白能与抗人CTLA-4单抗特异结合。结论成功构建了能稳定表达人CTLA4 Ig融合基因的减毒鼠伤寒沙门菌真核表达载体,并在哺乳动物细胞中成功表达有生物学活性的重组人CTLA-4 Ig蛋白。     

携带ePNP基因的减毒伤寒沙门菌的构建及目的基因在胰腺癌细胞中的表达

目的构建含有pEGFP-C1-PNP质粒的减毒鼠伤寒沙门菌SL3261菌株,检测其在胰腺癌细胞BxPc-3中的表达。方法 PCR扩增得到PNP基因,构建真核表达载体pEGFP-C1-PNP,并进行酶切、PCR和测序鉴定。利用电转化法将重组质粒转入减毒鼠伤寒沙门菌SL3261,进行形态学和表面抗原稳定性检测。含质粒SL3261菌株与BxPc-3细胞体外共培养,利用荧光显微镜观察和RT-PCR检测绿色荧光蛋白的表达和PNP基因的转录。结果目的基因正确连接pEGFP-C1中,并成功转入减毒鼠伤寒沙门菌,感染细胞亦检测到目的基因的表达。结论成功构建了能携带ePNP基因真核表达质粒的SL3261菌株,且该基因能在胰腺癌细胞中正确表达。     

表达幽门螺杆菌UreB减毒鼠伤寒沙门氏菌对小鼠的免疫保护作用

目的：构建表达幽门螺杆菌（Helicobacter pylori,H.pylori)尿素酶B亚单位（UreB)减毒鼠伤寒沙门氏疫苗菌,研究其对小鼠抗H.pylori的免疫保护作用。方法：用PCR扩增ureB,将其克隆入高效原核表达质粒pTrc99A,进行基因测序,重组质粒鉴定后导入减毒鼠伤寒沙门氏菌SL3261。用SDS聚丙烯安凝胶电泳、Western blot和薄层扫描进行目的蛋白表达分析。C57BL／6小鼠用重组菌免疫,4周后用H.pyloriSS1攻击,再4周后处死小鼠,取胃做快速尿素酶试验和H.pylori定量培养,对照观察免疫效果。结果：构建了携带ureB的重组原核表达质粒pTrc99A-ureB,并将它成功转化了减毒鼠伤寒沙门氏菌SL3261。重组菌SL3261(pTrc99A-ureB）表达了约66ku的UreB。与对照组相比,重组菌免疫组H.lpylori定植水平明显下降（P＜0．05）。结论：构建了表达H.pylori UreB的重组减毒鼠伤寒沙门疫苗菌,该菌株对C57BL／6有免疫保护作用。     

编码hsp60和IL-2的幽门螺杆菌减毒沙门菌核酸疫苗

目的:构建含幽门螺杆菌(Helicobacter pylori, H. pylori)hsp60基因和细胞因子IL-2的核酸疫苗,体外转染COS-7细胞,并鉴定其表达蛋白的免疫原性,体内检测其免疫保护作用.方法:以H. pylori菌株基因组DNA为模板,PCR扩增hsp60基因,从pCIneo-IL-2扩增小鼠IL-2基因,检测hsp60及IL-2的核苷酸序列;通过酶切、连接反应把hsp60和IL-2同时克隆入pIRES;通过脂质体法将pIRES-hsp60-IL-2转染COS-7细胞,SDS-PAGE及Western 印迹法检测表达蛋白的免疫性.重组载体转化入LB5000,抽提质粒,再转化入SL7207,反复传代,鉴定重组核酸疫苗菌的稳定性.以该疫苗菌接种小鼠,4周后H. pylori攻击,再4周后鉴定感染状况.结果:成功扩增出长约1 640 bp的hsp60基因和510 bp的IL-2,测序结果表明扩增出的hsp60基因与H. pylori hsp60序列一致,IL-2序列和小鼠的IL-2序列一致.PCR和酶切鉴定结果证实hsp60和IL-2基因克隆入载体pIRES,成功构建了含hsp60基因和IL-2基因的幽门螺杆菌核酸疫苗pIRES-hsp60-IL-2,并且Western 印迹法检测到相对分子质量为60 000 hsp60蛋白和14 000的IL-2蛋白条带.体内实验显示pIRES-hsp60-IL-2及pIRES-hsp60疫苗接种组分别有79.9%、62.5%小鼠获免疫保护.结论:成功构建了编码hsp60和IL-2基因幽门螺杆菌减毒沙门核酸疫苗,体外实验验证了其免疫原性,体内实验证实其具有免疫保护性.     

表达幽门螺杆菌过氧化氢酶的无抗性减毒鼠伤寒沙门氏菌株的构建

目的构建表达幽门螺杆菌(Hp)过氧化氢酶的无抗性减毒鼠伤寒沙门氏菌疫苗。方法采用缺失腺苷酸环化酶(△cya)、环腺苷酸受体蛋白(△crp)及天门冬氨酸β-半醛脱氢酶(△asd)的鼠伤寒沙门菌(X4072)作为宿主,将编码过氧化氢酶的基因CAT插入Asd 的组成型表达载体pYA248,通过两次转化引入宿主菌,构建表达过氧化氢酶基因平衡致死的减毒鼠伤寒沙门重组菌X4072(pYA248-CAT)。采用桥联法ELISA测定X4072(pYA248-CAT)培养上清液和裂解上清液中过氧化氢酶的抗原性,参照Meacock的方法及重组菌生长曲线的测定来确定重组菌株的稳定性,通过C57BL/6小鼠口服测定半致死量来确定重组菌的安全性。结果成功构建了表达过氧化氢酶的减毒鼠伤寒沙门菌重组菌株X4072(pYA248-CAT)。桥联法ELISA测定表明重组菌X4072(pYA248-CAT)培养上清中过氧化氢酶的含量高于菌体裂解液;重组菌pYA248-CAT在没有选择压力的情况下培养25代,随机挑选的重组菌全部都能生长,且在ELISA测定过氧化氢酶抗原时均显阳性;重组菌的生长曲线测定表明,X4072(pYA248)和X4072(pYA248-CAT)的生长状态基本一致。口服重组菌株X4072(pYA248-CAT) 1.0×1010 cfu,30 d后C57BL/6存活率仍为100%。结论成功构建了表达过氧化氢酶的无抗性的减毒鼠伤寒沙门菌疫苗X4072(pYA248-CA     

结核杆菌Esat6与hGM-CSF双顺反子表达载体的构建及鉴定

目的 从质粒pVAE中克隆目的基因Esat6,与hGM-CSF一起构建双顺反子表达载体pIEG,并进行鉴定.方法 以质粒pVAE为模板扩增出Esat6基因,与pIRES的MCS A进行重组,构建pIEsat6重组质粒.然后再以pORF-hGM-CSF为模板扩增出hGM-CSF基因,与pIRES载体的MCS B进行重组,构建pIGM重组质粒,上述两重组质粒经PCR、限制性内切酶图谱及DNA序列测定分析等多种方法进行鉴定后,再通过酶切、连接把hGM-CSF构建于pIEsat6质粒中,形成双顺反子真核表达载体pIEG.结果 通过PCR可克隆得到相应大小的产物,酶切鉴定所切下的两片段大小约为0.29 kb和0.47 kb,与预计相符.测序结果与报道一致.结论 成功构建结核杆菌Esat6基因与hGM-CSF双顺反子真核表达载体,为进一步研究其结核融合DNA疫苗及其转染DC疫苗原型的免疫保护效果奠定了基础.     

pCDR1Th表位和CTLA4Ig双基因共表达真核表达载体的构建

目的 构建能稳定表达pCDR1 Th表位和CTLA4Ig融合基因的真核表达载体,探讨其在小鼠体内的表达并对表达产物进行鉴定.方法 用Touchdown PCR法扩增CTLA4Ig基因,同时引入pCDR1 Th表位.将PCR产物连接真核表达载体pcDNA3.1( ),构建pcDNA3.1( )-CTLA41g-pCDR1.将构建表达CTLA4Ig-pCDR1减毒鼠伤寒沙门菌SL7207喂饲BALB/c小鼠,取脾脏进行免疫组化鉴定重组蛋白在动物体内的表达.结果 酶切鉴定和基因序列测定显示重组质粒构建成功.重组蛋白在BALB/c小鼠脾脏免疫细胞胞浆中有阳性表达.结论 成功构建了能稳定表达pCDR1 Th表位和CTLA4Ig融合基因的真核表达载体.     

Value of D-Dimers in patients with acute aortic dissection

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.     

Research of combined liver-kidney transplantation model in rats

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.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

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.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

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.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

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.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

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.