赖型钩端螺旋体017株外膜蛋白LipL32基因重组质粒的构建及其细胞毒性的研究

目的构建赖型钩端螺旋体(钩体)017株外膜蛋白LipL32基因的重组质粒,并研究其细胞毒性。方法从钩体017株全基因组中用PCR方法扩增出目的基因,双酶切构建重组质粒,转化大肠杆菌,诱导表达LipL32蛋白,将表达的目的蛋白免疫新西兰大白兔,制备多克隆抗体,Western Blotting鉴定其免疫原性。将目的蛋白纯化、复性后作用于ECV304细胞,通过检测细胞的乳酸脱氢酶(LDH)、NO释放量研究其细胞毒性。结果扩增出816bp的LipL32基因,重组质粒经双酶切、PCR鉴定、测序均表明重组载体构建成功。经IPTG诱导表达的融合蛋白相对分子质量约52×103,主要以包涵体的形式表达,经免疫动物制备得到多克隆抗体,ELISA检测效价达1:32000,Western Blotting显示在目的蛋白位置处有特异性阳性条带。经过LipL32蛋白作用的ECV304细胞LDH、NO释放量和对照组比较有明显升高。结论成功构建LipL32基因重组质粒,该质粒能在大肠杆菌中表达,表达的目的蛋白对细胞有一定的毒性效应。     

钩端螺旋体赖型017株外膜脂蛋白LipL41基因的克隆及原核表达

目的 构建钩端螺旋体外膜脂蛋白LipL41基因的重组原核表达质粒,为进一步制备以LipL41为目的基因的亚单位免疫苗提供实验依据。方法 根据钩端螺旋体L.kirscneri RM52株外膜脂蛋白LipL41基因序列设计引物,以赖型钩端螺旋体017株基因组DNA为模板,进行PCR扩增并DNA测序,以质粒pGEX1λT为载体,插入LipL41基因片段构建重组原核表达质粒,并检测LipL41的表达。结果 测序结果示所得片段为LipL41的编码序列,酶切及PCR分析证实重组质质构建成功,SDS－PAGE和Western blotting分析重组质粒可高效表达蛋白质LipL41。结论 LipL41基因的重组原核表达质粒构建成功,并可在大肠杆菌中高效表达。     

重组钩端螺旋体多抗原位点同源合成基因的表达及其抗原性鉴定

目的：构建重组钩端螺旋体(钩体)优势抗原表位原核表达系统,以期获得高纯度的钩体优势抗原表位重组融合蛋白,为进一步研究钩体快速检测方法奠定基础。方法：利用基因重组的方法构建表达质粒pET-rLP。经IPTG诱导后,获得高效表达带组氨酸标签的以包涵体形式存在的融合蛋白,包涵体蛋白经尿素变性溶解,采用镍离子亲和纯化,利用SDS-PAGE、Western blotting和间接ELISA法鉴定。结果：在相对分子质量为20 000处有1条特异性蛋白条带,为重组钩体优势抗原表位融合蛋白;ELISA结果显示其可与钩体阳性血清特异性结合,而与其他血清无交叉反应。结论：成功构建重组钩体优势抗原表位原核表达系统,并获得高纯度的重组钩体优势抗原表位融合蛋白。     

波摩那型钩端螺旋体外膜蛋白LipL32基因片段的克隆表达

目的　构建L3 2_pGEX_5x_2重组质粒 ,诱导表达重组钩端螺旋体外膜脂蛋白LipL3 2。方法　PCR获取编码LipL3 2的基因片段 ,构建重组克隆载体和表达载体 ,转化受体菌 ,诱导表达重组LipL3 2蛋白。将重组LipL3 2蛋白和钩体抗血清进行Western_blot。结果　扩增出约 750bp的LipL3 2成熟蛋白基因 ,LipL3 2基因插入pGEX_5x_2表达载体 ,表达产物谷胱甘肽S_转移酶 (GST ,2 6× 10 3)与LipL3 2蛋白的融合蛋白的相对分子质量约为 53× 10 3 ,与预期大小一致。Western_blot显示重组LipL3 2蛋白能与钩体抗血清特异结合。结论　LipL3 2蛋白能在大肠埃希菌中表达 ,重组LipL3 2蛋白具有免疫反应性     

钩端螺旋体膜表面蛋白LipL41基因的克隆、序列分析及表达

目的:进一步分析钩端螺旋体LipL41的免疫原性.方法:通过PCR的方法,以我国特有的钩端螺旋体流感伤寒群临海型lin6株(56609)的DNA 为模板,扩增目的基因LipL41,克隆至pcDNA3载体上,以自动测序仪测序后进行序列分析,然后克隆至原核表达载体pGEX-5T进行原核表达,Western印迹分析其免疫原性.结果:获得长1 068 bp的片段,DNA序列分析表明该菌株的LipL41基因与文献报道具有很高的同源性(95.0％～99.4％),在大肠杆菌中获得了表达,并与抗钩端螺旋体血清反应.结论:该抗原为致病性钩端螺旋体所具有的保守性抗原成分,可能在钩端螺旋体病的诊断和预防中发挥作用.     

钩端螺旋体Lipl21基因真核质粒构建及在HeLa细胞的表达

目的构建钩端螺旋体外膜脂蛋白Lipl21基因片段的真核表达重组质粒,利用脂质体体外转染HeLa细胞,探讨其在体外真核细胞中的表达情况,为寻找新的预防钩端螺旋体病的候选疫苗分子提供实验依据. 方法应用PCR技术从钩端螺旋体黄疸出血群赖型56601株基因组模板中扩增Lipl21基因,纯化回收后克隆入pUCM-T载体,再亚克隆入真核表达载体pcDNA3.1（＋）,运用脂质体2000将重组体pcDNA3.1（＋）/LipL21转染入HeLa细胞,免疫组化法观察目的基因的表达. 结果双酶切及测序鉴定证明成功构建LipL21真核表达重组体pcDNA3.1（＋）/LipL21,DNA测序显示重组质粒含有561bp的目的基因片段,读码框架正确,无碱基错配及移码突变.重组质粒pcDNA3.1（＋）/LipL21在体外HeLa细胞中能有效表达目的蛋白LipL21. 结论成功构建了钩端螺旋体Lipl21基因真核表达质粒pcDNA3.1（＋）/Lipl21,且能够在体外真核细胞中表达,为进一步筛选新的预防钩端螺旋体病的候选疫苗分子奠定了一定的实验基础.     

家兔支气管败血波氏杆菌重组蛋白DNT1的原核表达及其间接ELISA方法的建立

目的表达支气管败血波氏杆菌(Bordetella bronchiseptica,Bb)DNT蛋白,并以此建立检测Bb抗体的间接ELISA方法。方法参照GenBank公布的猪源支气管败血波氏杆菌dnt基因序列(AB020025)针对其N-端设计了一对特异性引物,PCR扩增出相应的核苷酸片段。将PCR扩增产物连接至原核表达载体pET-28a(+)载体中,以E.coli BL21(DE3)为表达菌株进行诱导表达,以纯化重组蛋白DNT1作为诊断抗原,通过探索最佳抗原包被量和抗体血清稀释倍数,建立检测支气管败血波氏杆菌重组蛋白DNT1抗体的ELISA方法。结果成功克隆了dntN-端的基因序列,并在E.coli BL21(DE3)中获得高效表达,经SDS-PAGE、Western blot分析显示重组蛋白DNT1具有良好的抗原性。应用重组蛋白DNT1为抗原建立了检测Bb血清抗体的间接ELISA诊断方法。试验确定重组蛋白DNT1抗原的包被浓度为6.25μg/mL,最适血清稀释度为1∶100。结论建立的ELISA检测方法,不仅为Bb抗体检测提供了一种比较实用的血清学检测手段,也为进一步开发Bb检测试剂盒奠定了基础。     

小鼠肝炎病毒N蛋白间接ELISA方法的建立

目的运用重组蛋白作为包被抗原建立检测小鼠肝炎病毒抗体的间接ELISA方法。方法将大肠杆菌表达小鼠肝炎病毒核衣壳蛋白（Nucleocapsid N）的主要抗原域NP（S）纯化后作为诊断抗原,通过条件优化,建立检测小鼠肝炎病毒抗体的间接ELISA方法。结果确定其包被抗原的浓度为300 ng/mL,血清稀释度为1∶200,山羊抗小鼠酶标抗体的稀释浓度为1∶3000。S/P≥0.386则为阳性,S/P〈0.308为阴性,两者之间为可疑。经阻断试验、交叉试验和重复性实验,表明该方法特异性强,重复性好。与国家实验动物检测中心的MHV全病毒ELISA抗体诊断试剂盒比较,特异性、敏感性和符合率分别为94.1%、93.3%和93.9%。用该融合蛋白包被聚苯乙烯板后在-20℃下可保存5个月,应用该方法检测了98份送检的血清样品,有10份检测为阳性。结论本研究建立的间接ELISA特异性强,重复性好,为进一步开发MHV血清抗体诊断试剂盒奠定了基础。     

测定HFRS患者血清中特异性抗体方法初探

作者建立了检测HFRS患者血清特异抗体的捕获ELISA和阻断ELISA,并与间接酶染色和间接免疫荧光抗体技术进行了比较。四种方法的阳性检出率相同。血清的几何平均滴度,捕获ELISA比IFAT高32倍;阻断ELISA、酶染色及IFAT无显著差异。但应用不同抗原,ELISA检测血清滴度亦有不同。     

家兔支气管败血波氏杆菌重组百日咳杆菌粘附素(PRN) 蛋白的原核表达及其间接ELISA方法的建立

目的 表达支气管败血波氏杆菌(Bordetella bronchiseptica,Bb)PRN蛋白,并以此建立检测Bb抗体的间接ELISA方法.方法 参照GenBank公布的猪源支气管败血波氏杆菌prn基因序列(AY376325)设计了一对特异性引物,PCR扩增出相应的核苷酸片段.将PCR扩增产物连接至原核表达载体pGEX-4T-1中,以E.coli BL21( DE3)为表达菌株进行诱导表达,以纯化重组蛋白PRN作为诊断抗原,通过探索最佳抗原包被量和抗体血清稀释倍数等,建立检测支气管败血波氏杆菌抗体的间接ELISA方法.结果 成功克隆了prn全基因序列,并在E.coli BL21( DE3)中获得高效表达,经SDS-PAGE、Western blot分析显示重组蛋白PRN具有良好的抗原性.应用重组蛋白PRN为抗原建立了检测Bb血清抗体的间接ELISA诊断方法.试验确定重组蛋白PRN抗原的包被浓度为500ng/mL,最适血清稀释度为1:40.结论建立的ELISA检测方法,不仅为Bb抗体检测提供了实用的血清学检测手段,也为进一步开发Bb检测试剂盒奠定了基础.     

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.     

Development on Adjustable Calibration Marker for Shock Wave Focus

Shock wave lithotripsy （SWL） is a treatment of choice for upper urinary stones. However, this procedure is inappropriate for obese patients because the focus is often unable to reach the target owing to the limited focal distance in shock wave source. Although treating such patients in a blast path may increase the application length of shock wave source, it＇s difficult to find this path on the lithotripter monitor. For this reason, we invented an adjustable calibration marker in order to set an effective focus in the shock wave hath.     

Study on the TCM Pathogenesis of Angiopathic Complications of Type II Diabetes

Excess production of reactive oxygen species(ROS)of mitochondrion mediated by hyperglycemia is the common pathogenesis of angiopathic complications of diabetes.TCM holds that the damp from the dysfunction of spleen.kidney and liver is the causative factor of complications of diabetes.This is similar to the mechanism of Ros resulting in angiopathic complications of diabetes.When the angiopathic complications of type II diabetes mellitus(T2DM)are difierentiated as caused by turbid damp in TCM can be explained as ROS.Since the obstruction of pathogenic damp in channels and collaterals is said to be the main pathogenesis,the treating principle should be dissolving the damp to remove the obstruction.     

Leptin, Ghrelin and TNF-α before and after Hypo-caloric Traditional Chinese Diet and Auricular Acupuncture

INTRODUCTION Obesity is a complex emergent problem, which can be possibly solved not only by the diet but also by the life style and promotion of a constant physical exercise. 1, 2 No doubt careful attentions must be given to the nutritional condition of obese people, the dietary habits, the somatic build (i.e. distribution of fat mass) and the organic functions linked to formation of the fat mass. All the parameters should be constantly monitored before, during and after a diet treatment. 3, 4, 5     

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.     

Relationship between Dysglycemia and Carotid Atherosclerosis in Tibetan Population

People with dysglycemia are at high risk for atherosclerotic diseases. This study aims at investigating the atherosclerotic vascular damage in dysglycemia and its metabolic origin in Tibetan population.     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

CLINICAL SIGNIFICANCE OF SERUM CYTOKINES IL-1β,sIL-2R,IL-6,TNF-α,AND IFN-v IN ACUTE CORONARY SYNDROME

Objectives To explore serum cytokines levels (including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v) and their significance in patients with acute coronary syndrome (ACS) and the subsequent follow-ups, with attempt to estimate the role of various serum inflammatory markers in the diagnosis and assessment of ACS.Methods The study population include 40 patients with acute myocardial infarction (AMI), 40 patients with unstable angina pectoris (UAP), and 40 controls. Among the 80 patients, 60 patients attended a follow up 4 months later. Serum inflammatory markers including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v were measured by enzyme linked immunosorbent assay.Results Serum IL- 1 β, sIL-2R, IL-6, TNF-α were significantly higher in AMI group or UAP group compared to the control group and became significantly lower 4 months later in the follow-up patients. Serum levels of IFN-v shows no significant difference between AMI group or UAP group and controls, also showing no significant change when measured in follow up patients. There was no correlation between serum creatine kinase-MB isoenzyme levels and serum inflammatory markers either in UAP or AMI group. Furthermore, when divided into two subgroups using Wagner's QRS scoring system in the AMI group, there is no difference of each serum inflammatory marker between ≤ 6 scores group and ＞ 6 scores group.Conclusion Serum levels of certain inflammatory markers may have some diagnostic value for ACS, and can be a useful marker reflecting disease stability.     

Possible Spread of adenovirus type 3 from poultry to humans ：indirect evidence from an outbreak in China

Objective:To explore the epidemiology and etiology for an outbreak of acute respiratory tract infection that occurred in one county of Jiangsu Province, China 2004. Methods: Only cases meeting the case definition were included in the study. We reviewed the medical records of the cases who were admitted to the local hospitals, interviewed cases by a standard questionnaire, and then described the epidemiotogic features and analyzed risk factors by means of a case-control study. We collected pharyngeal swab specimens and sent them to different laboratories for isolation and culture. The laboratory used different detection methods such as DIP, PCR, electron microscope examination and microneutralization assay, to identify and then type the positive specimens. Results:A total of 871 cases were reported during the period from April 18 to July 4,2004. The distribution of onset times presented two peaks, one in late May and another in middle June. The epidemic occurred mainly in the elementary and junior high schools in ten townships of one county, and the mean age of the cases was 12 years (range 7 months to 18 years). The course of the disease was acute, and was characterized by fever accompanied with sore throat and tonsillitis. The WBC count of cases was normal or elevated. The mean duration of illness was 5 days (range 2 to 12 days). No fatalities from illness were reported. A case-control study indicated that the possible risk factors were close contact with a case and/or poultry before onset and sharing of towels among members of the family. The typical CPE was observed through inoculating pharyngeal swab specimens into the HEP-2 cell cultures in different laboratories. An infection of adenovirus type 3 was verified by detecting positive specimens in different methods. Conclusion:This investigation demonstrated that the acute respiratory infection in cases was caused by adenovirus type 3. Cases occurred in over 70 schools in ten townships in 2004, and the route of transmission was possibly close contact with cases or droplet transmission.