高纯度可溶性嵌合蛋白VEGI+的表达纯化

目的:制备纯化的新型血管生长抑制剂可溶性嵌合蛋白VEGI ,为进一步研究其活性奠定基础.方法:应用PCR方法制备血管内皮细胞生长抑制因子(VEGI)与寡肽CTTHWGFTLC相嵌合的融合基因VEGI ,将PCR产物克隆至pGEM-T载体中,经酶切及测序鉴定后,与原核表达载体pET30a( )重组,构建重组表达载体pET30a-VEGI ,转化大肠杆菌BL21并诱导表达,纯化并鉴定表达产物.结果:成功扩增融合基因VEGI ,构建的重组质粒pET30a-VEGI 酶切鉴定结果与预期一致,诱导后表达产物以包涵体为主.SDS-PAGE电泳及Western印迹结果表明,复性纯化后的嵌合蛋白VEGI 相对分子质量约为23 000,纯度约为90%.结论:成功构建了重组表达载体,并在大肠杆菌诱导表达,亲和层析纯化后获得纯度较高的可溶性嵌合蛋白VEGI .     

小鼠周脂素基因的原核表达及纯化

目的构建小鼠周脂素（prilipin,Plin）原核表达载体,表达周脂素蛋白并进行初步纯化,为研究周脂素的功能奠定基础。方法通过酶切从pMD18-Plin重组载体上酶切下周脂素目的基因,定向插入原核表达载体pET-32a（＋）中,转化大肠杆菌BL21（DE3）,IPTG诱导表达。表达产物经SDS-PAGE及Western blot鉴定后,进行纯化。结果构建的pET-32a-Plin载体能够表达周脂素重组蛋白,表达量约占菌体总蛋白的50%,经初步纯化后,纯度达95%以上。结论成功构建了周脂素原核表达载体,并在原核系统中表达了重组蛋白,纯化的蛋白纯度较高,可用于后续试验。     

导向性IFN-α2a-α-MSH基因的克隆、表达、纯化及鉴定

目的:构建导向性IFN-α2a-α-MSH融合基因的原核表达载体,并建立重组蛋白的原核高效表达体系.方法:将本实验室已构建的pET-22b( )IFN-α2a-NGR用BamH Ⅰ和SalⅠ限制性内切酶进行双酶切,将得到的大片段与设计的α-MSH多肽片段退火后的产物进行连接,构建原核表达载体pET-22b( )IFN-α2a-α-MSH,将序列鉴定正确的重组质粒转化入Rosetta-gamiTM2(DE3)大肠杆菌,IPTG诱导表达目的蛋白.对表达产物进行SDS-PAGE及Western Blot鉴定.结果:在大肠杆菌中成功实现了IFN-α2a-α-MSH的稳定高效表达,表达产物以包涵体形式存在,采用超声裂菌的方法,用疏水作用层析技术获得较高纯度的重组蛋白.结论:成功克隆、表达和纯化了IFN-α2a-α-MSH蛋白.     

TAT-EGFP融合蛋白表达载体的构建及表达

目的:构建TAT-EGFP原核表达载体,在E.coli BL21中高效表达并纯化.方法:人工合成编码TAT蛋白转导区的DNA片段,插入载体pET28a后得到pET28a-TAT重组质粒,再连接绿色荧光蛋白(EGFP)基因,组成pET28a-TAT-EGFP重组表达子.转化大肠杆菌,IPTG诱导TAT-EGFP融合蛋白表达.表达产物用十二烷基硫钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)鉴定,组氨酸亲和层析柱纯化融合蛋白.结果及结论:成功地构建了TAT-EGFP融合蛋白的原核表达载体,在诱导后获得了高效表达并纯化,为进一步研究TAT的蛋白转导作用奠定了基础.     

牛γ-干扰素在大肠杆菌中的表达及抗原性鉴定

目的 在大肠杆菌中高效表达牛γ-干扰素(bovine interferon-γ,BovIFN-γ),并对其生物活性进行初步鉴定.方法 依据GenBank上基因序列人工合成BovIFN-γ基因,PCR方法扩增该基因,将其插入PET-28a载体构建原核表达质粒,转化大肠杆菌BL21中,在IPTG诱导下表达BovIFN-γ,并进行Western blot鉴定.Ni-NTA亲和层析法和电洗脱方法纯化表达的重组蛋白,用Western blot和商品化的BovIFN-γ检测试剂盒进行重组蛋白的抗原性检测.结果 成功构建了BovIFN-γ原核表达载体PET-28a- BIFN-γ,并在大肠杆菌中高效表达,表达蛋白约占菌体总蛋白的32％,表达产物主要以可溶性形式存在于菌体裂解液上清中;重组蛋白可与BovIFN-γ单克隆抗体反应,Ni-NTA亲和层析法纯化的重组蛋白抗原活性比电洗脱方法纯化的抗原活性高.结论 在大肠杆菌中成功表达了可溶性的BovIFN-γ蛋白,可与BovIFN-γ单抗发生反应,纯化的重组蛋白具有良好的反应原性.     

重组猪生长抑素的基因克隆、表达与纯化

目的：在大肠杆菌中克隆表达猪重组生长抑素基因,并进行纯化和鉴定．方法：根据GenBank公布的猪生长抑素基因序列,按照大肠杆菌偏爱密码子设计并合成2条DNA单链,退火后获得猪生长抑素基因序列．克隆至原核表达载体pGEX-4T-1质粒中,转化感受态细胞DH5α,经IPTG诱导表达重组融合蛋白并用GST亲和柱对其进行纯化．结果：重组质粒经酶切鉴定和DNA序列测定证明基因完全正确,经IPTG诱导后在大肠杆菌DH5α中得到高水平表达,表达产物经超声和溶菌酶破碎和Glutathione Sepharose4B亲和层析纯化获得重组蛋白．结论：猪生长抑素基因得到了高水平表达,纯化后纯度达到95％以上,为表达产物的大量制备、重组疫苗的进一步优化及在畜牧业生产上的应用研究奠定了基础．     

鼻咽癌人源抗独特型基因工程抗体的原核表达及鉴定

目的构建鼻咽癌人源抗独特型单链抗体原核表达载体，对其产物做初步鉴定，为鼻咽癌疫苗制备奠定基础。方法采用分子克隆技术，PCR扩增G22ScFv基因，并将其克隆到原核表达载体pET25b（＋）上，将重组子转化大肠杆菌BL21（DE3），经IPTG诱导表达后，表达的蛋白经His—tag纯化试剂盒纯化后复性。SDS—PAGE及Western blot分析融合蛋白。结果构建的原核表达载体pET25b（＋）－G22经测序检测，序列正确。在大肠杆菌中G22ScFv以包涵体形式获高效表达，SDS－PAGE及Western blot鉴定表达的目的蛋白Mr为25kD，同时证实载体构建及表达均正确。目的蛋白经试剂盒纯化后电泳分析纯度达95％以上。结论利用基因重组技术，在原核细胞中表达出重组G22ScFv并得到纯化，为研究鼻咽癌疫苗打下了基础。     

土曲霉洛伐他汀合成调控基因lovE的克隆与表达

目的 克隆表达土曲霉洛伐他汀合成调控基因lovE,为研究lovE蛋白的生物学功能奠定基础.方法 利用原核表达载体pET21b(+)构建lovE原核表达质粒,并在大肠杆菌中通过IPTG诱导表达;亲和层析法纯化重组蛋白.结果 构建了pET-lovE原核表达质粒,经原核表达和亲和层析获得6×His-lovE融合蛋白,蛋白纯度...     

重组结核分枝杆菌ESAT6-PPE68融合蛋白的制备

目的 构建结核分支杆菌esat6-ppe68融合基因及其原核表达载体,在大肠杆菌中表达融合蛋白ESAT6-PPE68.方法 用基因拼接(GeneSOEing)法扩增esat6-ppe68融合基因,并将其定向克隆至原核表达载体pGEX-4T-1,构建原核表达重组质粒pGesat6-ppe68.重组子经限制性内切酶分析、聚合酶链式反应及测序鉴定后转化宿主菌大肠杆菌BL21,IPTG(异丙基-β-D硫代半乳糖苷)诱导表达约69 000带谷胱苷肽硫转移酶蛋白(GST)标签的正SAT6-PPE68融合蛋白,经谷胱苷肽-硫-转移酶融合蛋白纯化试剂盒得到纯化的融合蛋白,产物进行SDS-PAGE电泳、Western-blotting鉴定.结果 重组质粒pGesat6-ppe68中目的基因测序结果与报道序列完全相同;在大肠杆菌中以可溶性非包涵体形式表达;表达量约占菌体总蛋白的40%,表达蛋白纯化后获得纯度为90%左右的重组蛋白;Westernblotting结果证实重组蛋白与确诊的结核病患者血清发生特异免疫反应.结论 成功构建了原核表达载体pGesat6-ppe68,获得了rESAT6-PPE68融合蛋白,为rESAT6-PPE68融合蛋白在结核病诊断中的应用奠定了基础.     

人HMGB1基因原核表达载体的构建及其在大肠杆菌中的表达和纯化

目的  构建人高迁移率族蛋白B1（HMGB1）基因的原核表达载体,观察表达水平并纯化重组蛋白。方法  根据GenBank中人HMGB1基因序列,用OptimumGeneTM行密码子优化并合成目的基因,经PCR扩增,NdeⅠ和XhoⅠ双酶切,插入原核表达载体pQE-T7-2的相应位点,构建原核表达质粒pQE-T7-2/HMGB1。经菌落PCR、酶谱分析及序列分析鉴定重组质粒,转化大肠杆菌BL21(DE3),异丙基-β-D-硫代半乳糖苷(IPTG)诱导重组蛋白表达,采用SDS-PAGE和Western blot印迹法鉴定重组蛋白,Ni NTA树脂亲和纯化目的蛋白。结果  成功构建人HMGB1克隆载体和表达载体;表达的目的蛋白约占菌体总蛋白的20%以上,Western blot法显示,重组蛋白能与抗HMGB1抗体和抗His抗体特异结合,亲和层析纯化后纯度达90%以上。结论  成功构建高效稳定的重组人HMGB1原核表达载体,获得纯化人HMGB1蛋白,为进一步研究HMGB1的功能奠定基础。     

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.     

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.