转化生长因子-β1反义RNA腺病毒载体的构建

目的构建含转化生长因子β1(TGF-β1)反义RNA的重组腺病毒重组体。方法将TGF-β1的cDNA5＇端630bp片段反向插入穿梭载体pAdTraek-CMV,构建为TGF-β1反义RNA的重组体(pAdTrack-antiTGFβ1),将重组体pAdTrack-antiTGFβ1与包装质粒pAdEasy-1共转染BJ5183细菌。用选择培养基筛选同源重组的阳性克隆,同源重组的腺病毒载体转染293细胞,在荧光显微镜下观察细胞中的绿色荧光蛋白(GFP)及PCR扩增目的基因等方法鉴定重组的腺病毒。结果构建了含rGF-β1反义RNA的重组腺病毒,其滴度为2.4×10     

冠心病患者巨噬细胞移动抑制因子水平增高及其与ADMA—NO的关系

目的检测冠心病患者血浆巨噬细胞移动抑制因子（MIF）含量以及探讨MIF在促内皮功能紊乱中的相关病理生理机制。方法将173例冠心病患者分为3个亚组：确诊为冠心病但未接受经皮冠状动脉介入治疗（PEI）的病人（n=33）、刚接受PCI术的病人（7d内）（n=43）、接受PCI术大于6个月的病人（n=97），另选62名健康体检者作为健康对照组。采用ELISA检测血浆MIF含量，qRT-PCR检测外周血白细胞中MIF、CD74mRNA水平。同时以Eahy926细胞为研究对象，采用MIF刺激，观察相关炎性因子的表达及活性氧（ROS）、NO水平。结果冠心病人和健康人群MIF的含量分别为（1422±53.01）pg／ml、（1103±64.52）pg／ml（P〈0.01）。冠心病人群MIF的含量比健康人群显著上升，其接受PCI术后的时间长短与MIF含量无显著关系，但随着时间的延长其MIF的含量有降低趋势。外周血白细胞中MIF、CD74mRNA含量与健康对照组相比有上升趋势，但差异无统计学意义（P〉0.05）。培养细胞中加入20ng／mlMIF时，炎性因子表达增高，二甲基精氨酸二甲胺水解酶2（DDAH2）mRNA量下降显著，ROS增多，NO量下降。结论血浆MIF的升高可能是冠心病的-个危险因素，同时MIF可能通过MIF-ROS-DDAH2-ADMA—NO途径-导致血管内皮功能紊乱，促进动脉粥样硬化的发生与发展。     

血管紧张素转化酶2基因对人内皮细胞巨噬细胞移动抑制因子表达的影响

目的众多研究资料表明,巨噬细胞移动抑制因子(macrophage migration inhibitory factor,MIF)是体内一种重要的细胞因子和炎症介质,其在动脉粥样硬化发生中可能发挥重要作用。动脉粥样硬化中MIF能抑制巨噬细胞游走,促进巨噬细胞在炎症局部浸润,其过度调节可能在单核巨噬细胞的黏     

反义基因治疗对H9C2心肌细胞β_1受体表达的影响

目的 观察阳离子脂质体介导的β1受体反义基因对H9C2心肌细胞β1受体mRNA及受体蛋白表达的影响,寻求最佳转染比率。方法 H9C-2心肌细胞,用去甲肾上腺素（norepinephrine,NE）刺激24h后转染β1受体反义寡核苷酸（β1 antisense oligonucleotide,β1-AS-ODN）,脂质体与β1-AS-ODN的混合摩尔比为2.0、2.5和3.0,分别转染18h、24h和36h;在倒置荧光显微镜下观察心肌细胞的形态;用免疫印迹技术测定心肌细胞β1受体蛋白的时间表达曲线。实验分为4组：NE组、NE加β1受体反向寡核苷酸（β1 inverse oligonucleotides,β1-IN-ODN）组、NE加β1-AS-ODN组、心肌细胞组,用半定量逆转录多聚酶链反应检测心肌细胞β1受体mRNA的表达。结果 β1-AS-ODN分布在心肌细胞的胞浆及细胞核中,转染24h效率达70%,此后平缓降低;NE组的心肌细胞β1受体蛋白显著升高;与NE组相比,脂质体与β1-AS-ODN的混合摩尔比2.0、2.5,和3.0的心肌细胞β1受体蛋白显著降低（P〈0.05,P〈0.01,P〈0.05）;与心肌细胞组比较,NE组和β1-IN-ODN组的心肌细胞β1受体mRNA和受体蛋白显著升高（P〈0.01）;与NE组相比,NE加AS-ODN组的心肌细胞β1受体mRNA和受体蛋白显著降低（P〈0.01）。结论 阳离子脂质体与β1-AS-ODN比率为2.5转染24h效果最好,其机制可能是通过激活核糖核酸酶H降解靶mRNA,在转录和翻译水平抑制目的基因表达。     

高血压大鼠ACE2的表达及其与一氧化氮相关性分析

目的探讨血管紧张素转换酶2(ACE2)在自发性高血压大鼠(SHR)中的表达情况并对其与血清一氧化氮(NO)水平作相关性分析。方法分别采用实时荧光定量PCR,Northern印迹以及免疫印迹技术测定心、肾组织中ACE2的mRNA与蛋白表达情况,同时用硝酸还原酶法检测血清NO含量。结果与WKY对照组相比,SHR大鼠心、肾组织中ACE2的mRNA和蛋白表达均明显下降(ACE2/GAPDH mRNA拷贝数比值为:心脏0·043±0·012vs1.291±0·619;肾脏0·051±0·016vs0·914±0·433,P均<0·01;蛋白相对OD值为:心脏0·729±0·046vs1±0·053;肾脏0·734±0·063vs1.005±0·05,P均<0·01),同时出现血清NO浓度下降[(24.3±8.0vs78.4±27.9)μmol/L,P<0·01)。相关分析发现,大鼠血清NO水平与心、肾组织中ACE2/GAPDH的mRNA拷贝数比值呈正相关(r=0·610,0·521,P均<0·05),而与血压水平则呈负相关(r=-0·656,P<0·05)。结论SHR大鼠心、肾组织中ACE2的mRNA和蛋白表达均明显下降,很可能与体内NO水平降低及血压上升有关。特异性影响ACE2转录和表达的药物将对高血压病的防治有重要的临床应用价值。     

外泌体在心血管疾病中的研究进展*

AIM: Exosomes are bi-lipid membrane originated in the cell endocytosis system and secreted into the extracellular matrix. The cells secrete exosomes into extracellular matrix to impact target cells with the significant functions of cell-cell information transmission and immunological regulation. Recent studies show that cell-cell communication regulated by exosomes can be found in both physiological and pathological conditions of cardiovascular diseases (CVD). Exosomes derived from many types of cells (such as myocardial cells, endothelial cells and stem cells) play an important regulatory role in the pathogenetic mechanism of CVD. Meanwhile, exosome-based investigations have shown huge potential for the treatment of CVD. This review will focus on the biological characteristics and functions of exosomes in the diagnosis and treatment of CVD.     

聚合酶链反应芯片筛选5-氟尿嘧啶对乳鼠心肌细胞心脏毒性差异表达基因的作用

目的应用聚合酶链反应（polymerase chain reaction,PCR）芯片技术观察5-氟尿嘧啶（5-fluorouracil,5-FU）对乳鼠心肌细胞心脏毒性相关基因表达的调控作用。方法利用差速贴壁法分离培养乳鼠心肌细胞．分为对照组和5一FU刺激组。提取并纯化细胞RNA,紫外分光光度计检测RNA提取物浓度、变性琼脂糖凝胶电泳检测其纯度及完整性。选择包含84个已知心脏毒性相关基因的PCR芯片,采用比较阈值（△△Ct）法分析两组基因的表达差异。以表达差异（即上调或下调）大于2倍的基因为有意义的差异基因。结果共有48条基因出现差异表达,其中5条基因表达上调,43条基因表达下调。结论利用PCR芯片技术筛选相关基因,为深入阐明5-FU心脏毒性的作用机制提供了新思路。     

Dysregulation of microRNAs in a mouse model of diabetic myocardial fibrosis

Background Myocardial fibrosis plays a critical role in the process of diabetic cardiac remolding.MicroRNAs (miRNAs) are endogenous,small non-coding RNAs that negatively regulate gene expression in diverse biological and pathological processes.However,the roles of miRNAs in myocardial fibrosis have not been well elucidated.In the present study,miRNAs profiles in the fibrotic myocardium of db/db mice and miRNAs expression in TGF-β1-stimulated mouse cardiac myofibroblasts was examined.Methods Heart function of 18-week-old db/db mice and db/m control mice was detected by echocardiography.miRNA expression profile in diabetic myocardium was detected by miRNA microarray.Quantitative real-time PCR was used to determine the expression of fibrosis-related genes and miRNA precursors of interest.Western blot was used to detect the levels of fibrosis-related proteins,activated Smad3 and total Smad3.Results The result of echocardiography showed that left ventricular systolic and diastolic function was impaired in 18-week-old db/db mice without significant change of ejection fraction (EF) and fractional shortening (FS).Fibrosis-related genes expression was upregulated and the amount of phosphorylated Smad3 was increased significantly in the diabetic myocardium.miRNAs dysregulation was shown in diabetic myocardium,sixty-eight miRNAs,including miR-208b,miR-29b,miR-26b and miR-30e,were increased over two-fold,meanwhile,sixty-two miRNAs were decreased more than two-fold in the myocardium of db/db mice compared to db/m controls.In parallel with a significant upregulation of Col1a1,Col3a1 and CTGF miRNA expression,miR-208b,miR-29b,miR-26b and miR-30e precursors were also shown to be upregulated in TGF-β1-induced C57bl/6 mouse cardiac myofibroblasts.Conclusions microRNAs were dysregulated in diabetic myocardium,with the activation of TGF-β/smad3 pathway,contributing to diabetic myocardial fibrosis.     

细菌-酵母穿梭表达质粒pGBKT7-MIF的构建及转化

【目的】构建并转化能在酵母菌AH10 9中表达巨噬细胞游走抑制因子 (MIF)的穿梭表达质粒pGBKT7 MIF。【方法】用RT PCR方法从人T淋巴细胞中扩增MIF基因全外显子片段 ,并定向克隆入细菌 酵母穿梭表达质粒 pGBKT7中 ;用PEG/LiAC法将pGBKT7 MIF转化感受态酵母菌AH10 9。提取转化酵母菌的质粒DNA ,转化大肠杆菌并行质粒的酶切鉴定。【结果】扩增出人MIFcDNA片段 ,限制性内切酶酶切和DNA测序证实获得正确的重组质粒 pGBKT7 MIF ;获得可在色氨酸缺陷培养基 (SD/ trp)上生长含 pGBKT7 MIF的酵母菌克隆。酶切鉴定表明pGBKT7 MIF已转化入酵母菌AH10 9。【结论】成功构建穿梭质粒 pGBKT7 MIF ,并转化入酵母菌AH10 9。