特异性miR-221抑制剂对结直肠癌细胞增殖及凋亡的影响

目的探讨miR-221在结直肠癌细胞中的表达状况及特异性miR-221抑制剂对癌细胞增殖和凋亡的影响。方法应用实时荧光定量PCR(real-time Q-PCR)检测四种人结肠癌细胞系HT-29、Lovo、SW-480、Caco2中miRNA-221表达状况,并以人脐静脉内皮细胞HUVEC作为正常对照;设计并合成miR-221、anti-miR-221(微小RNA抑制剂)寡核苷酸,以脂质体转染Caco2细胞系,以Real-time Q-PCR再次检测转染后细胞中miR-221表达状况,并通过噻唑蓝(MTT)比色法及流式细胞仪观察细胞的增殖和凋亡状态。结果与正常细胞相比,4种人结肠癌细胞系中miR-221表达均显著增高,差异具有统计学意义(P<0.01);癌细胞转染anti-miR-221后,G0/G1期细胞比例明显增加,而S期细胞比例显著下降,并可见细胞凋亡的发生(P<0.01)。结论 miR-221特异性抑制剂可通过抑制细胞增殖同时诱导凋亡而抑制结直肠癌细胞生长,提示miR-221作为结直肠癌生物治疗有效靶点有进一步研究价值。     

microRNA-221在结直肠癌中的表达及其对癌细胞迁移的影响

目的  研究上皮-间质转化（EMT）相关的微小RNA（microRNA,以下简称miRNA）-221在结直肠癌患者中的表达水平,并探索其对结直肠癌细胞迁移水平的影响。方法  选取该院40例结直肠癌患者为研究组,选取同期体检的40例健康人群为对照组。采用实时定量RT-PCR法检测结直肠癌患者癌组织以及癌旁组织中miRNA-221表达水平,同时对比结直肠癌患者及正常人血浆中miRNA-221表达水平。对结直肠细胞采用miRNA-221的mimic及inhibitor分别高、低表达miRNA-221后,采用transwell法分别检测细胞的侵袭水平以及EMT相关蛋白表达。结果  miRNA-221在直肠癌组织的表达水平显著高于癌旁组织,差异有统计学意义（P <0.05）;miRNA-221在直肠癌患者血浆中的表达水平显著高于健康对照人群,差异有统计学意义（P <0.05）。干扰结直肠癌HT-29细胞株中miRNA-221后,结直肠癌细胞迁移能力显著降低（均P <0.05）,且细胞中EMT相关的上皮钙黏蛋白（E-cad）的表达水平降低;而过表达HT-29细胞株中miRNA-221,结直肠癌细胞迁移能力显著增加,且细胞中EMT相关的上皮钙黏蛋白（E-cad）的表达水平增加。结论  结直肠癌患者高表达的miRNA-221通过促进结直肠癌细胞的迁移水平来参与结直肠癌发生发展的进程。

     

微核糖核酸-221对小鼠癫痫神经元细胞的作用及其机制研究

目的 探讨微核糖核酸(miRNA)-221对小鼠癫痫神经元细胞氧化应激和凋亡影响的机制.方法 建立癫痫神经元细胞株模型,随机分为正常对照组、miRNA阴性对照(miRNA-con)组和miRNA-221 mimic转染(miRNA-221)组,每组样本12例.采用实时荧光定量RT-PCR法检测细胞miRNA-221的表...     

MicroRNA-221在恶性肿瘤中的研究进展

miRNA-221在甲状腺癌、肝癌、胶质细胞瘤、恶性黑色素瘤、乳腺癌等多种恶性肿瘤中高表达,其通过抑制相关靶基因的表达促进肿瘤的发生、发展。miRNA-221的研究为恶性肿瘤诊断标志物的筛选和基因治疗靶点的寻找提供了新的方向。     

miRNA-101在胃癌组织和细胞中的表达及对胃癌生物学行为的影响

目的:探讨miRNA-101在胃癌组织和细胞中的表达情况及对胃癌细胞生物学行为的影响.方法:应用实时荧光定量PCR法分析31例胃癌组织和癌旁组织样本以及人胃癌细胞系SGC-7901、MKN45、人正常胃黏膜上皮细胞系GES1中miRNA-101的表达水平;建立miRNA-101重组腺病毒载体感染胃癌细胞系SGC-7901、MKN45,对照组为感染阴性对照病毒的胃癌细胞系SGC-7901、MKN45,MTT法检测miRNA-101对胃癌细胞增殖能力的影响;Transwell小室法检测胃癌细胞的迁移和侵袭能力.结果:胃癌组织中miR-101表达水平明显低于癌旁组织(P<0.01);miR-101在细胞系SGC-7901和MKN45中的表达量明显低于人正常胃黏膜上皮细胞系GES1(P<0.01).孵育48 h后MKN45细胞miRNA-101组的细胞增殖能力低于其对照组(P<0.05);而孵育72 h后SGC-7901细胞和MKN45细胞的miRNA-101组细胞增殖能力均亦低于相应对照组(P<0.05).迁移试验结果显示,miRNA-101组迁移的胃癌细胞SGC-7901和MKN45的平均细胞数明显低于相应对照组(P<0.01);侵袭实验结果显示,miRNA-101组侵袭的胃癌细胞SGC-7901和MKN45的平均细胞数亦明显低于其对照组(P<0.01).结论:miRNA-101在胃癌组织和胃癌细胞系中表达下调,转染miRNA-101可明显降低SGC-7901和MKN45细胞的增殖、迁移、侵袭能力,miRNA-101可能参与了胃癌疾病的发生及发展.     

天麻素通过调节miRNA-221/PI3K/Akt通路对LPS诱导的肺泡上皮细胞损伤的影响

目的 探索天麻素(gastrodin,GAS)及磷脂酰肌醇3-激酶/蛋白激酶B (PI3K/Akt)通路在脂多糖(LPS诱导的肺泡上皮细胞损伤中的作用及可能机制。方法 将人肺泡上皮细胞A549分为正常对照组、LPS组、GAS组、miR-221 siRNA组、control siRNA组,采用RT-qPCR实验检测miRNA-221 mRNA的表达水平;ELISA实验检测细胞培养液中炎性因子的含量;MTT实验检测细胞活力;Western blot实验检测细胞中磷脂酰肌醇3-激酶(PI3K)、磷酸化蛋白激酶B (p-Akt)、蛋白激酶B (Akt)、Bcl-2相关X蛋白(Bax)、B细胞淋巴瘤基因-2 (Bcl-2)及半胱氨酸/天冬氨酸蛋白酶9 (Caspase9)蛋白的表达情况。结果 与LPS组比较,GAS组中GAS可明显降低LPS诱导的A549细胞中miRNA-221 m RNA的表达,升高p-Akt蛋白的表达,差异均具有统计学意义(P<0.05);与LPS组比较,miRNA-221 siRNA组抑制miRNA-221的表达后,可促进LPS诱导的A549细胞中PI3K、p-Akt...     

miRNA-135b 对鼻咽癌细胞侵袭 和转移的促进作用

目的 研究miRNA-135b 对鼻咽癌CNE1 细胞系侵袭和转移的影响和作用机制。方法 用逆转录聚 合酶链反应（RT-PCR）检测miRNA-135b 在鼻咽癌CNE1 细胞系中的表达,分别在鼻咽癌CNE1 细胞系中 过表达和下调miRNA-135b,通过微孔滤膜培养小室及双室联合培养系统（Transwell TM）检测肿瘤细胞迁移和 侵袭能力,采用Western blotting 检测大型肿瘤抑制因子同源蛋白2（LATS2）的表达。结果 miRNA-135b 在 鼻咽癌CNE1 细胞系中高表达,通过增强miRNA-135b 表达,鼻咽癌CNE1 细胞的侵袭和转移能力有所提升; 通过靶向miRNA-135b 干扰载体,下调miRNA-135b 表达,鼻咽癌CNE1 细胞的侵袭和转移能力有所下降。 增强miRNA-135b 表达,LATS2 活性和表达下降,而下调miRNA-135b 表达,LATS2 活性和表达上升。结 论 miRNA-135b 过表达会提升鼻咽癌CNE1 细胞的侵袭和转移能力,下调miRNA-135b 表达可有效抑制鼻 咽癌细胞增殖,促进细胞凋亡。miRNA-135b 的表达可能通过影响LATS2 活性影响鼻咽癌细胞的生长。     

肝癌石蜡包埋组织miRNA提取方法的优化

目的改进并优化从肝癌(HCC)甲醛固定石蜡包埋组织(FFPE)提取并检测微小RNA(miRNA)的方法。方法使用miRNeasy FFPE试剂盒探讨提取HCC石蜡组织miRNA最佳切片厚度及蛋白酶K作用时间。实时定量RT-PCR检测miR-221、miR-146a、let7-a、miR-191、miR-103及RNU6B的表达量。将HCC细胞制成石蜡组织,对比同一细胞系新鲜细胞及石蜡包埋细胞的各个miRNA表达量差异。结果切片厚度30μm,蛋白酶K作用时间48h时提取miRNA效果最佳。各HCC细胞系及临床HCC石蜡组织均有不同水平的miRNA-221、miR-146a、let7-a、miR-191、miR-103及RNU6B表达。同一细胞系新鲜细胞与石蜡包埋后的各miRNA表达无明显差别。结论改良后的miRNeasy FFPE提取方法能提取石蜡组织中的miRNA,可重复性强,可推广用于临床各种石蜡包埋组织的miRNA提取。     

四环素调控TRAIL基因表达对人白血病细胞系Jurkat生物学特性的影响

本实验将人肿瘤坏死因子相关的凋亡诱导配体(TNF—related apoptosis inducing ligand，TRAIL)基因的cDNA片段导入四环素基因调控系统RevTet—On。病毒感染人白血病细胞Jurkat后，建立了四环素调控TRAIL基因表达细胞系Jurkat—RevTet—On-TRE-TRAI(Jurkat3T)和对照细胞系Jurkat—RevTet—On-TRE(Jurkat2T)。通过强力霉素(Dox)诱导TRAIL基因的表达，Western印迹检测到TRAIL蛋白的表达；细胞计数证明了TRAIL的杀伤作用；通过流式细胞术检测到了TRAIL的凋亡诱导作用，生物物理学检测表明TRAIL表达使细胞渗透脆性增大，最大变形能力下降。结果表明TRAIL基因的表达能够促进肿瘤细胞Jurkat的凋亡并引起了Jurkat细胞生物学特性的改变。     

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.     

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.     

Scientific principles and rigorous processes should be followed in developing clinical guidelines for therapeutic interventions of integrative medicine

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.