siRNA对肺癌细胞株bcl-2基因表达的抑制

目的研究小干扰RNA(siRNA)对bcl-2基因表达的抑制作用.方法利用Ambion公司提供的设计软件和试剂盒,设计合成以bcl-2基因为靶标的siRNA,通过脂质体将合成的siRNA转入A549和NCI-H460细胞株,以未转染细胞和转染bcl-2的反义药物G3139为对照,经MTT法检测siRNA对细胞生长的抑制,RT-PCR检测bcl-2 mRNA水平,流式细胞仪检测细胞周期的改变和bcl-2蛋白表达,反应siRNA对bcl-2表达的抑制效应.结果siRNA组与对照组细胞存活率各时间点均有显著差异(P<0.05);与反义组在24、48 h也有显著差异(P<0.05),而72 h无差异(P>0.05).转染12 h后,siRNA组bcl-2 mRNA与对照组和反义组有显著差异(P<0.05).转染48 h后,siRNA组bcl-2蛋白阳性率明显低于对照组和反义组,siRNA组和反义组细胞阻滞于S期.结论体外转录合成的siRNA可抑制A549和NCI H46细胞bcl-2基因的表达,效率可达50%以上.     

siRNA对K562和K562/ADM细胞耐药和凋亡的调节

目的 研究联合转染以MRP和bcl-2基因为靶标的siRNA,对白血病细胞株K562和耐药的K562/ADM细胞药物敏感性和凋亡的影响.方法 体外化学合成以多药耐药相关蛋白(MRP)和bcl-2为靶标的siRNA,分别或联合用脂质体转染人阿霉素处理的K562和K562/ADM以单纯化疗处理组和未处理组为对照.转染后24、48、72 h,MTT法检测各组细胞生长抑制率,计算IC50值.转染24 h后RT-PCR检测各组细胞相应靶基因mRNA表达水平,48 h后流式细胞仪检测细胞MRP和bcl-2蛋白表达率和细胞凋亡率.结果 K562/ADM细胞ADM的IC50为12.81 μg/ml,ADM MRP-siRNA组降为3.74 μg/ml,ADM bcl2-siRNA组降为6.82 μg/ml ADM MRP-siRNA bcl2-siRNA组降至2.51 μg/ml;K562细胞ADM的IC50为6.75 μg/dml,ADM MRP-siRNA组降为3.22 μg/ml,ADM bcl2-siRNA组降为3.56 μg/ml,ADM MRP-siRNA bcl2-siRNA降至1.84 μg/ml,有统计学意义(P<0.01).转染以MRP和bcl-2为靶标的siRNA后,细胞相应靶基因的mRNA及蛋白的表达明显减低,细胞凋亡率显著升高,联合转染两种siRNA,细胞的IC50进一步下降,细胞凋亡率进一步升高,与分别转染组相比有统计学差异(P<0.05);结论联合转染以MRP和bcl-2基因为靶标的siRNA,通过降低靶基因蛋白表达,产生协同作用,明显增加耐药和亲本肿瘤细胞药物敏感性和凋亡率.     

耐药肺癌细胞caspase8、bcl-2、细胞色素C及bcl-2 mRNA的异常表达

目的探讨肺癌细胞耐药性与凋亡蛋白caspase8、bcl-2、细胞色素C及bcl-2 mRNA异常表达的关系。方法培养肺癌A 549耐药株(A 549R)和敏感株(A 549S),采用逆转录聚合酶链反应技术(RT-PCR)对两株细胞bcl-2 mRNA进行扩增并作琼脂糖电泳,设-βactin为内对照比较其表达水平;W estern B lot法检测caspase8、bcl-2、细胞色素C蛋白表达并比较两株细胞中上述蛋白质表达水平。结果A 549S凋亡启动蛋白caspase8及细胞色素C的表达高于A 549R(P<0.05),而bcl-2蛋白表达低于后者(P<0.05);bcl-2 mRNA表达相对丰度分别为:A 549S 8.74±1.81,A 549R 10.29±2.92,差异无统计学意义(P>0.05)。结论bcl-2的过度表达可能使caspase8和细胞色素C蛋白表达降低从而造成细胞耐药,但bcl-2的这种过度表达可能是在转录或其后的过程而非基因水平发生。     

联合应用以MRP和bcl-2为靶标的siRNA对鼻咽癌细胞耐药和凋亡的调节

[摘要] 目的 研究联合转染以MRP和bcl－2为靶标的siRNA后,鼻咽癌细胞株CNE2和耐药细胞CNE2/DDP的药物敏感性和凋亡率的改变。方法 以MRP和bcl－2为靶标的siRNA(均为100 umol/L)分别或联合转入顺铂处理的CNE2和CNE2/DDP以单纯化疗处理组和未处理组为对照。转染后24,48,72 h MTT法检测各组生长抑制率,计算IC50值。RT-PCR检测转染12 h各组细胞相应靶基因mRNA表达水平,流式细胞仪检测转染48 h各组MRP和bcl－2蛋白表达率和细胞凋亡率。结果 细胞分别转染以MRP和 bcl－2为靶标的siRNA后,相应靶基因的mRNA及蛋白的表达明显减低,细胞的凋亡率生高,IC50均较单纯化疗组低,有统计学意义（P<0.05）,两者间也有统计学差异（P<0.05）;联合转染两种siRNA后细胞的IC50进一步显著下降,细胞凋亡率显著升高,与各组相比均有统计学差异（P<0.01）。结论 联合以MRP和bcl－2基因为靶标的siRNA,通过降低靶基因蛋白表达,产生协同作用,明显增加耐药和亲本肿瘤细胞药物敏感性和凋亡率。 [关键词] Bcl-2 MRP siRNA 鼻咽肿瘤     

联合应用以MRP和bcl-2为靶标的siRNA对肺癌细胞耐药和凋亡的影响

目的研究联合转染以MRP和bcl-2为靶标的siRNA,肺癌细胞株SW1573和SW1573／R20药物敏感性及凋亡的改变。方法以MRP和bcl-2为靶标的siRNA（均为100μmol／L）分别或联合转入柔红霉素处理的SW1573和SW1573／R20与单纯化疗处理组和未处理组对照。转染后24、48、72h MTT法检测各组生长抑制率,计算IC50值。RT-PCR检测转染12h各组相应靶基因mRNA表达水平,流式细胞仪检测转染48h各组MRP和bcl-2蛋白表达率和细胞凋亡率。结果细胞转染siRNA后,相应靶基因mRNA及蛋白表达明显减低,细胞的凋亡率升高,IC50均较单纯化疗组低,有统计学意义〈0．01）;联合应用两种siRNA后细胞IC50进一步下降,细胞凋亡率显著升高,与各组相比均有统计学差异俨〈0．05）。结论联合以MRP和bcl-2基因为靶标的siRNA,通过降低靶基因蛋白表达,产生协同作用,明显增加耐药和亲本肿瘤细胞药物敏感性和凋亡率。     

siRNA沉默VEGF-C 基因对宫颈癌HeLa细胞的生物学特性影响

目的通过RNA干扰技术抑制宫颈癌细胞VEGF-C表达,探讨干扰后VEGF-C、NF-κB、bcl-2基因的表达。方法根据人VEGF-C mRNA编码序列,设计RNA干扰的靶点,并用脂质体转染人宫颈癌HeLa细胞,通过RT-PCR法观察转染后肿瘤细胞VEGF-C、NF-κB、bcl-2基因的变化。结果转染siRNA 24h、48h可以使HeLa细胞VEGF-C mRNA含量降低,在24h降低80.63%±0.24%(P<0.001);在48h降低38.9%±0.85%(P<0.01);NF-κB mRNA含量也分别降低,在24h降低37.55±2.76%(P<0.05);在48h降低30.5%±3.82%(P=0.056);bcl-2mRNA含量同时分别降低,在24h降低76.95%±1.91%,(P<0.01);在48h降低64.11%±2.96%,(P<0.05))。结论脂质体介导的VEGF-C siRNA转染HeLa细胞后,可以有效抑制VEGF-C的表达;可能通过下调转录因子NF-κB,抑制抗凋亡基因bcl-2的表达。     

低氧条件下RNA干扰阻断Notch3通路对人肺腺癌A549细胞增殖的影响

目的 观察低氧条件下RNA干扰阻断Notch3对人肺腺癌A549细胞增殖的影响.方法 低氧条件下(1％O2)培养人肺腺癌A549细胞,以Notch3 siRNA转染A549细胞(Notch3 siRNA组),RT-PCR和Western blotting法分别检测A549细胞内Notch3及其信号通路下游基因HES1 mRNA和蛋白表达,MTT法检测转染24、48、72 h A549细胞的细胞活力;另设阴性对照组和空白对照组.结果 Notch3 siRNA转染A549细胞后,Notch3、HES1 mRNA和蛋白表达均显著降低(P＜0.05);Notch3 siRNA转染后时间依赖性抑制A549细胞生长,Notch3 siRNA组转染48、72 h细胞活力与阴性对照组和空白对照组比较,差异有统计学意义(P＜0.05).结论 低氧条件下Notch3 siRNA转染人肺腺癌A549细胞可有效抑制Notch3及其下游靶基因HES1的表达,并抑制A549细胞生长.     

Bcl2-siRNA增加人肺腺癌细胞化疗敏感性的研究

目的探讨bcl2-siRNA增加人肺腺癌细胞株A549对顺铂敏感性的作用。方法在人肺腺癌细胞株A549细胞中转染bcl2-siRNA,48 h后加入不同浓度（0、0.5、1、2、3μg/mL）新鲜配置的顺铂溶液,药物作用48 h后,用CCK-8法检测细胞生长抑制率。荧光实时定量PCR（Realtime RT-PCR）检测A549细胞转染bcl2-siRNA后Bcl-2 mRNA的变化。Western Blot检测A549细胞转染bcl2-siRNA后Bcl-2蛋白的变化。结果在A549细胞中转染bcl2-siRNA后,Bcl-2 mRNA的表达下降了93.2%（P=0.037）,Bcl-2蛋白表达也明显降低。同时,细胞对顺铂的敏感性明显增加69.8%（P=0.024）。结论 Bcl2-siRNA能降低A549细胞中Bcl-2 mRNA及蛋白的表达,增加A549对顺铂的敏感性。     

Bcl2-siRNA提高人肺腺癌细胞A549/DDP对顺铂敏感性的研究

目的 探讨Bcl2-siRNA 对人肺腺癌顺铂耐药细胞株A549/DDP 对顺铂敏感性的影响.方法 在人肺腺癌顺铂耐药细胞株A549/DDP 细胞中转染bcl2-siRNA,48h 后加入不同浓度(0、3、6、9、12、15μg/ml) 新鲜配置的顺铂溶液,药物作用48h后,用CCK-8 法检测细胞生长抑制率.荧光实时定量PCR(Real time RT-PCR) 检测A549/DDP 细胞转染bcl2-siRNA 后Bcl-2mRNA 的变化,Western Blot 检测A549/DDP 细胞转染bcl2-siRNA 后Bcl-2 蛋白的变化.结果 在A549/DDP 细胞中转染bcl2-siRNA 后,细胞Bcl-2 mRNA 降低92.6%(P<0.05),Bcl-2 蛋白表达也明显降低,同时细胞对顺铂的敏感性增加57.8%(P<0.05).结论 Bcl2-siRNA 能降低A549/DDP 中Bcl-2 mRNA 及蛋白的表达,增加A549/DDP 对顺铂的敏感性.     

UbcH10基因沉默联合紫杉醇干预对NCI-H226细胞增殖活性和凋亡的影响

目的观察小干扰RNA(siRNA)介导的UbcH10基因沉默联合紫杉醇处理对人肺鳞癌细胞株NCI-H226细胞增殖活性和凋亡的影响。方法化学合成针对UbcH10基因的siRNA-UbcH10序列,脂质体转染siRNA至NCI-H226细胞(siRNA转染组),转染后24 h,采用Real-Time PCR和Western blotting分别检测UbcH10 mRNA和蛋白的表达水平,以未予任何转染细胞作为空白对照,以阴性序列转染细胞作为阴性对照。以紫杉醇(1μmol/L)处理siRNA转染及未转染NCI-H226细胞(siRNA+紫杉醇组和紫杉醇组),分别于转染后24、48 h收集细胞,MTT比色法检测细胞增殖;转染后24 h收集细胞,流式细胞仪检测细胞凋亡;以未经紫杉醇处理的siRNA转染、阴性序列转染和未予转染的NCI-H226细胞作为siRNA转染组、阴性对照组和空白对照组。结果Real-Time PCR和Western blotting检测结果显示:转染后24 h,siRNA转染组UbcH10 mRNA和蛋白的表达较空白对照组和阴性对照组显著下调(P0.01)。MTT比色法检测结果显示,siRNA转染组细胞增殖抑制率显著高于紫杉醇组和对照组(P0.05),而siRNA+紫杉醇组细胞增殖抑制率显著高于siRNA转染组(P0.05)。siRNA转染组细胞凋亡率显著高于紫杉醇组和对照组(P0.05),而siRNA+紫杉醇组细胞凋亡率显著高于siRNA转染组(P0.05),紫杉醇组与对照组细胞凋亡率比较差异无统计学意义(P0.05)。结论 UbcH10基因沉默可显著增强NCI-H226细胞对于化疗药物紫杉醇的敏感性。     

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.