肝细胞特异性表达Cre重组酶转基因小鼠的建立

目的 构建在小鼠肝细胞中特异表达Cre重组酶的转基因小鼠。方法 利用聚合酶链反应(PCR)获得小鼠肝细胞特异性启动子——白蛋白启动子，指导Cre重组酶在肝细胞中特异表达。通过受精卵显微注射的方法，将转基因载体导入小鼠受精卯中，获得转基因小鼠。利用逆转录聚合酶链反应(RT～PCR)检测转基因小鼠中Cre重组酶转录的组织特异性，并将转基因小鼠与Smad4条件基因打靶小鼠进行杂交，利用PCR和Southern Blot进一步检测Cre重组酶在小鼠体内表达的组织特异性及其介导lox P位点之间发生重组的活性。结果 获得了白蛋白启动子，构建了转基因载体pAlb-Cre。将转基因载体进行显微注射，共注射了837枚小鼠受精卵。PCR检测显示53只子代小鼠中有7只整合了Cre重组酶基因，Southern杂交结果证实共获得6只基因组上整合Cre重组酶基因的首建者小鼠。RT—PCR结果表明其中3只阳性小鼠的子代鼠在肝脏和睾丸中正确转录了外源基因。将在肝脏和睾丸中正确转录了外源基因的两只阳性鼠与Smad4条件基因打靶的小鼠杂交，通过PCR检测发现Cre转基因与Smad4条件基因打靶双阳性的子代鼠在肝脏中特异表达Cre重组酶，并能介导基因组中loxP序列间的基因重组，此结果通过Southern杂交得到了进一步证实。结论 成功构建了在小鼠肝细胞中特异表达Cre重组酶的转基因小鼠，为利用条件基因打靶技术研究基因在肝脏发育及相关疾病中的功能及机制奠定了基础。     

肝癌相关基因DLK1转基因小鼠的构建与鉴定

目的 构建并鉴定肝脏特异性表达的DLKl转基因小鼠.方法 通过基因重组方法,将小鼠DLK1 cDNA片段置于小鼠白蛋白基因增强子和启动子序列下游,构建肝脏特异性表达的DLKl重组质粒,酶切重组质粒得到转基因片段,转基因在体外进行表达鉴定后,显微注射获得DLK1转基因首建小鼠,对首建小鼠进行传代,利用F1代小鼠进行DLK1转基因表达的鉴定.结果 逆转录(RT)-PCR和细胞免疫荧光显示,转基因DLK1片段可在小鼠肝癌细胞系Hep1-6中表达.RT-PCR和免疫组化结果显示,DLK1在F1代成年转基因小鼠肝脏中特异性表达.结论 成功构建了肝脏特异性表达的DLK1转基因小鼠.     

Pax6突变杂合子小鼠糖代谢异常的分子机制

目的探讨Pax6突变杂合子小鼠是否存在糖代谢异常,并对其分子机制进行研究。方法采用腹腔注射葡萄糖耐量试验（IPGTT）,观察Pax6突变杂合子小鼠血糖和胰岛素原／总胰岛素比值的变化,胰岛素耐量试验（ITT）分析胰岛素敏感性的变化;小鼠离体胰岛采用定量PCR和Western印迹分析检测激素原转化酶1（PCI）表达;小鼠胰岛8细胞系用于染色质免疫共沉淀Ch1P分析以确定PAX6蛋白能否与Pc1基因启动子区域相结合,进而采用荧光素酶报告分析观察Pax6突变对Pc1基因表达的影响。结果与野生型小鼠相比,Pax6突变杂合子小鼠在6月龄时存在明显的负荷后高血糖,胰岛素敏感性未见显著变化,胰岛素原／总胰岛素比值不适当升高早于负荷后高血糖,类似人类Pax6基因突变的无虹膜症患者中糖代谢异常的表型特征。Pax6突变杂合子小鼠胰岛中PCI表达水平显著降低。PAX6蛋白可直接结合到Pc1基因启动子区域,野生型PAX6可上调Pc1表达,而突变型PAX6则无此作用。结论PAX6通过PCI介导的胰岛素原剪切加工调控葡萄糖代谢,这是PAX6的一种新功能。PCI缺乏引起的胰岛素原剪切加工缺陷是Pax6突变导致葡萄糖代谢异常的最重要分子机制之一。     

乙型肝炎病毒基因组转基因小鼠模型的制备与鉴定

目的 建立一种新的乙型肝炎病毒(HBV)基因组高效复制与表达转基因小鼠模型,以用于抗HBV药物筛选和乙型肝炎发病机制的研究。方法 以加长的ayw亚型HBV全基因组作为目的基因,采用显微注射技术,转导于小鼠受精卵细胞雄原核,然后将受精卵细胞移植于受体假孕母鼠输卵管内,发育产生子代小鼠。鼠尾组织聚合酶链反应(PCR)筛选、Southern印迹鉴定后,再用酶链免疫吸附法(ELISA)检测血清乙型肝炎表面抗原及e抗原,Southern印迹检测血清HBV DNA。结果 实验获子代小鼠61只,鼠尾组织经PCR筛选、Southern印迹鉴定18只阳性,血清乙型肝炎表面抗原及e抗原、HBV DNA呈阳性反应7只。结论 1.3倍加长的HBV全基因组转基因小鼠具有较高的复制、表达效率。     

胰岛素抵抗的HCV转基因鼠模型的建立

目的 建立胰岛素抵抗的丙型肝炎病毒(HCV)转基因鼠模型.方法 利用携带HCV Core稳定型表达载体,应用基因重组技术和显微注射技术,制备HCV转基因小鼠,用糖耐量试验和胰岛素耐量试验鉴定HCV转基因鼠出现胰岛素抵抗.结果 RT-PCR和Western blot结果表明成功构建了携带HCV Core转基因小鼠模型.1月龄转基因小鼠胰岛素水平明显高于正常鼠,胰岛素耐量试验异常,出现胰岛索抵抗.6月龄转基因小鼠出现肝脂肪变性.结论 成功制备胰岛素抵抗的HCV转基因鼠模型,为研究HCV核心蛋白所致胰岛素抵抗发病机制奠定了基础.     

人BRAF野生型及V600E突变型真核表达载体的构建及表达

目的:构建BRAF野生型和V600E突变型真核表达载体;转染并筛选稳定表达BRAF的胰腺癌细胞株,为探讨BRAF V600E突变在胰腺癌发生发展中的作用提供合适的细胞模型.方法:将BRAF野生型及V600E突变型cDNA克隆于真核表达载体pCMV-Myc中,构建pCMV-Myc-BRAFW)及pCMV-Myc-BRAFV600E重组质粒,酶切鉴定、测序证实序列正确后,利用脂质体将重组质粒转染胰腺癌细胞Panc-1,经G418培养筛选获得抗性细胞克隆,用RT-PCR和Western blot鉴定野生型和V600E突变型BRAF基因在Panc-1细胞中的表达.结果.酶切鉴定和序列分析证实,重组克隆pCMV-Myc—和pCMV-Myc—BRAFV600E序列正确,RT-PCR和Western blot结果显示G418筛选获得的转基因Panc-1细胞稳定表达BRAF和BRAF V600E.结论:成功构建了pCMV-Myc-BRAFW和pCMV-Myc-BRAFV600E真核表达载体,建立了稳定表达BRAF和BRAF V600E的胰腺癌细胞株.稳定表达BRAF和BRAF V600E的胰腺癌细胞株.稳定表达BRAF和BRAF V600E的胰腺癌细胞株.     

pEGFP-C1-PTEN的构建及其在乳腺癌细胞ZR-75-1中的表达

采用分子克隆技术构建重组质粒人野生型PTEN绿色荧光蛋白真核表达载体(pEGFP-C1-PTEN),以脂质体转染法转染人乳腺癌细胞株ZR-75-1中,应用RT-PCR、Western印迹法分析目的 基因的表达.双酶切和特异PCR结果表明克隆的基因片段约1.2 kb,测序法进一步证实该基因为PTEN编码基因,经NCBIBLAST分析与Gene Bank中基因序列完全相同;RT-PCR、Western印迹显示pEGFP-C1-PTEN转染组有PTENmRNA及PTEN蛋白表达.成功构建了人野生型PTEN绿色荧光蛋白真核表达载体pEGFP-C1-PTEN,并将其成功转染入乳腺癌细胞ZR-75-1中,为研究PTEN在肿瘤发生发展中的作用奠定了基础.     

MAGE-1与IL-18共表达DNA疫苗的构建与体外表达

目的构建MAGE-1与IL-18共表达质粒pcIL-18-MAGE并进行体外验证表达。方法设计合成MAGE-1与IL-18引物,PCR扩增其基因片段,分别构建以pcDNA3为载体的小鼠IL-18重组质粒和人MAGE-1重组质粒,pcCMV-IL-18与MAGE-1的PCR产物酶切连接构建共表达质粒pcIL-18-MAGE。脂质体法将构建的重组质粒转染293细胞,RT-PCR和Western印迹法验证MAGE-1和IL-18在转化细胞中的表达。结果成功获得共表达质粒pcIL-18-MAGE,RT-PCR可见目的条带,Western印迹显示转染MAGE-1与IL-18的细胞在蛋白质水平上均有表达。结论成功地构建出既表达mIL-18又表达MAGE-1的共表达质粒pcIL-18-MAGE。     

解偶联蛋白-2基因过表达慢病毒载体的构建

目的构建解偶联蛋白-2（UCP-2）基因慢病毒表达载体。方法用RT-PCR技术从转基因肥胖小鼠肝脏组织中获得UCP-2基因编码区片段,用In-Fusio技术将PCR产物连接入Age I单酶切后的慢病毒转移质粒体pGC-FU,进行鉴定及序列测定。将构建成功的转移质粒和两种辅助包装原件载体质粒pHelper1.0、Helper2.0（VS-VG元件）共转染293T细胞,包装成慢病毒,浓缩纯化后检测滴度。结果RT-PCR产物经电泳证实成功获取UCP-2基因cDNA克隆,鉴定证实慢病毒转移质粒连接构建正确,病毒包装滴度为2×108TU/ml。结论成功构建了UCP-2基因慢病毒表达载体。     

KLF14基因过表达对改善Hepa1-6小鼠肝癌细胞胰岛素抵抗的作用

目的探讨KLF14基因过表达对小鼠肝癌细胞Hepa1-6胰岛素抵抗的影响。方法实时荧光定量PCR(RT-QPCR)检测KLF14基因m RNA在健康C57BL/6J小鼠各组织的表达分布情况;构建小鼠KLF14基因重组真核表达质粒p IRES2-EGFP-KLF14并转染Hepa1-6细胞,RT-PCR法检测KLF14基因m RNA的表达;Western印迹检测KLF14及p-AKT蛋白水平的表达。结果成功构建p IRES2-EGFP-KLF14质粒;转染肝癌细胞48 h后,KLF14 m RNA和蛋白水平明显高于对照组和空载组(P0.01);转录水平上KLF14基因在小鼠体内普遍表达,其m RNA相对表达量由高到低依次为心脏、骨骼肌、肝脏、脂肪、小肠、肾脏、脑、肺、胃、脾、附睾;非转染组给予血清干预后,正常人血清处理组和糖尿病病人血清处理组无明显差异;而转染组给予血清干预后,糖尿病病人血清处理组p-AKT表达量较正常人血清处理组明显增加;在胰岛素刺激情况下,无论转染组或非转染组,给予PI3K抑制剂LY294002后,p-AKT表达受抑。结论 KLF14在C57BL/6J小鼠多种组织均有表达,提示其可能在维持正常生理功能中发挥一定作用;KLF14基因过表达可促进AKT的活化,并且其增加胰岛素敏感性的作用在糖尿病状态下较正常人更为明显。     

Establishment of transgenic mice carrying the gene of human nuclear receptor NR5A2 （hB1F）

AIM: Human hepatitis B virus enhancer II B1 binding factor (hB1F) was cloned and characterized as a novel member of the Ftz-F1 (NR5A) nuclear receptor subfamily. Although progresses have recently been made, its biological function remains largely unidentified. The aim of this study was to establish an hB1F transgenic mouse model to promote the functional study of hB1F. METHODS: Transgene fragments were microinjected into fertilized eggs of mice. The manipulated embryos were transferred into the oviducts of pseudopregnant female mice. The offsprings were identified by PCR and Southern blot analysis. Transgene expression was analyzed with RT-PCR and Western blot analysis. Transgenic founder mice were used to establish transgenic mouse lineages. The F1 and F2 mice were identified by PCR analysis. RESULTS: Seven mice were identified as carrying copies of transgene. RT-PCR and Western blotting results showed that the transgene was expressed in heart, liver, lung, kidney and stomach in one of the transgenic mouse lineages. Genetic analysis of the transgenic mice demonstrated that the transgene was integrated into the chromosome at a single site, and was transmitted stably. CONCLUSION: In this study we established an hB1F transgenic mouse model, which will facilitate the investigation of the biological function of hB1F in vivo.     

Establishment of transgenic mice carrying the gene of human nuclear receptor NRSA2 (hB1F)

AIM: Human hepatitis B virus enhancer Ⅱ B1 binding factor (hB1F) was cloned and characterized as a novel member of the Ftz-F1 (NRSA) nuclear receptor subfamily. Although progresses have recently been made, its biological function remains largely unidentified. The aim of this study was to establish an hB1F transgenic mouse model to promote the functional study of hB1F. METHODS: Transgene fragments were microinjected into fertilized eggs of mice. The manipulated embryos were transferred into the oviducts of pseudopregnant female mice.The offsprings were identified by PCR and Southern blot analysis. Transgene expression was analyzed with RT-PCR and Western blot analysis. Transgenic founder mice were used to establish transgenic mouse lineages. The F1 and F2mice were identified by PCR analysis. RESULTS: Seven mice were identified as carrying copies of transgene. RT-PCR and Western blotting results showed that the transgene was expressed in heart, liver, lung, kidney and stomach in one of the transgenic mouse lineages.Genetic analysis of the transgenic mice demonstrated that the transgene was integrated into the chromosome at a single site, and was transmitted stably. CONCLUSION: In this study we established an hB1F transgenic mouse model, which will facilitate the investigation of the biological function of hB1F in vivo.     

金银花提取物对小鼠肝脏和人肝细胞PGC—1α表达及胰岛素抵抗的影响

目的检测金银花提取物对小鼠肝脏和L02细胞中过氧化物酶体增殖物激活受体7（PPARy）共激活因子1α（PGC--1α）表达及对胰岛素抵抗（IR）的影响。方法分别将ob／ob小鼠、C57／B6J小鼠和L02细胞随机分为对照组和实验组,实验组给予金银花提取物,对照组给予生理盐水。给药后检测小鼠肝脏和L02细胞PGC-1α表达。结果与对照组相比,实验组ob／ob小鼠给予金银花提取物后肝脏PGC-1α mRNA和蛋白表达下调（P〈0．05或P〈0．01）;而实验组C57／B6J小鼠给药后肝脏PGC-1α mRNA表达与对照组比较无统计学差异。给药5d后实验组ob／ob小鼠FPG降低,但实验组与对照组组间胰岛素水平无统计学差异,实验组FPG／FIns比值显著降低。胰岛素耐量实验显示金银花提取物改善了ob／ob小鼠的IR。脂肪酸培养L02细胞,给予金银花提取物后PGC-1α mRNA表达下调（P〈0．05）,而正常培养I．02细胞PGC-1α mRNA表达无变化。结论金银花提取物可以下调PGC-1α在肝脏中的病理性高表达,降低血糖,改善IR。     

Gene expression profile in liver of hB1F transgenic mice

AIM: To analyze the tissue morphologic phenotype and liver gene expression profile of hB1F transgenic mice. METHODS: Transgene expression was analyzed with RT-PCR and Western blotting. For one of the transgenic mouse lines, tissue expression pattern of the transgene was also examined with immunochemical methods. Pathological analysis was used to examine the tissue morphologic phenotype of established transgenic mice. The liver gene expression profile of transgenic mice was analyzed with microchip, and some of the differentially expressed genes were verified with RT-PCR. RESULTS: The expressions of hB1F were shown in livers from 6 of 7 transgenic mouse lines. The overexpression of hB1F transgene did not cause pathological changes. Expressions of three genes were up-regulated, while down-regulation was observed for 25 genes. CONCLUSION: The overexpression of hB1F transgene may cause changes of gene expression profiles in the liver of transgenic mice.     

日本血吸虫果糖二磷酸醛缩酶的重组表达及其在血吸虫生活史各阶段的表达分析

目的 目的 在大肠杆菌中原核表达、 纯化日本血吸虫果糖二磷酸醛缩酶 （rSjFBPA）, 观察其在血吸虫生活史各阶段 的表达。方法 方法 以日本血吸虫成虫cDNA为模板扩增rSjFBPA基因, 克隆至pET28a （+） 质粒后, 再转化入E. coli BL21。 含重组质粒的菌株经IPTG诱导后, 采用SDS?PAGE和Western blotting分析鉴定重组蛋白rSjFBPA是否表达, 用层析法纯 化rSjFBPA并用SDS?PAGE鉴定其纯度。同时, 用RT?PCR方法分析SjFBPA在血吸虫尾蚴、 童虫、 成虫和虫卵各阶段的表 达情况。结果 结果 经PCR扩增出目的基因, 含目的基因的TA克隆质粒经双酶切和测序鉴定, 证明插入片段与预期目的基 因序列相符。Western blotting结果显示, 表达后的重组蛋白可与His?tag单克隆抗体发生特异性反应。经镍亲和层析法 制备了纯化的重组SjFBPA蛋白, 纯化重组蛋白浓度达4 mg/ml。RT?PCR结果显示, SjFBPA在日本血吸虫尾蚴、 童虫、 成 虫和虫卵阶段均有表达。 结论 结论 SjFBPA基因被成功克隆和表达, 其在日本血吸虫尾蚴、 童虫、 成虫和虫卵各阶段均有表 达。     

Association of ENPP1 (PC-1) K121Q polymorphism with obesity-related parameters in subjects with metabolic syndrome

Background The metabolic syndrome (MS), a cluster of several metabolic disorders, is increasingly being recognized as a risk factor for cardiovascular disease. Ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1), originally described as a plasma cell allo‐antigen and named plasma cell membrane glycoprotein (PC‐1), is an inhibitor of insulin‐induced activation of the insulin receptor. The single nucleotide polymorphism (SNP) K121Q in the ENPP1 gene has been studied in relation to obesity, insulin resistance and other features of MS in several populations with conflicting results. We therefore investigate the role of the K121Q SNP in the ENPP1 gene in MS in Caucasians from the province of Segovia in Central Spain (Castille). Design and methods We recruited 794 unrelated persons (46·5% males and 53·5% females), ages 35–74 years from a cross‐sectional population‐based epidemiological survey in the province of Segovia in Central Spain (Castille). Obesity‐related anthropometric measurements included BMI, waist circumference, blood pressure and lipid profile. MS was defined by International Diabetes Federation (IDF) guidelines. K121Q PC‐1 genotypes were determined by polymerase chain reaction‐restriction fragment length polymorphism (PCR‐RFLP). Results The 121Q allele was associated with an increased BMI and waist circumference among subjects fulfilling the criteria for MS. These differences remained statistically significant even after the adjustment for sex, age and degree of glucose tolerance (β = 1·347, P = 0·017 and β = 2·824, P = 0·046; for BMI and waist circumference, respectively). Moreover, among type 2 diabetic patients those carrying the 121Q allele had higher BMI and higher leptin levels than subjects carrying the K121K genotype. Conclusions Our results suggest that the ENPP1121Q allele might contribute to the genetic susceptibility to abdominal obesity among subjects with MS.