CREATE TRANSGENIC RABBITS BY MICROINJECTING HUMAN apoA-Ⅱ GENE INTO FERTILIZED EGGS

Objective To create transgenic rabbits by microinjecting human apolipoprotein A-Ⅱ (apoA-Ⅱ) geneinto one-cell embryos, to study apoA-Ⅱ gene function on plasma lipoprotein metabolism and atherosclerosis. Methods Superovulation and synchronization of estrus were induced in female Japanese White Rabbits by injecting hormone,then mating with male. After collected the fertilized eggs, the human apoA-Ⅱ gene was microinjected into the male pronucleus of eggs. The injected eggs were transferred into recipient female rabbits. Last, extract DNA from the new borns ear and determine whether the newborns were transgenic by polymerase chain reaction (PCR) or Southern blot analysis. Results A total of 822 embryos with microinjection of human apoA-Ⅱ gene were implanted into 28 recipient rabbits. The number of surviving newborns was 37. 3 transgenic positive surviving founders were found with humanapoA-Ⅱ.     

过氧化物酶增殖体激活受体γ2转基因小鼠的制作及其影响因素分析

目的分析影响转基因小鼠制作的因素,优化转基因动物制作过程,建立适合本实验室的转基因小鼠制作方法。方法利用显微注射方法制作转基因小鼠,对超数排卵的程序、受精卵的收集、外源基因的显微注射、胚胎移植和术后护理等影响因素都进行了对比研究。结果优化了转基因小鼠的制作过程,减少了影响胚胎移植成功的不利因素,提高了过氧化物酶增殖体激活受体γ2(PPAR-γ2)转基因小鼠的制作效率(2.9%)。结论成功制作了PPAR-γ2转基因小鼠,优化转基因小鼠的制作程序是提高转基因成功率的可行途径。     

DETECTING LOW DENSITY LIPOPROTEIN RECEPTOR MUTANT GENE OF RABBIT BY PCR

Objective Watanabe Heritable Hyperlipidaemic （WHHL） rabbits with low density lipoprotein receptor （LDLr） gene mutation have provided unprecedented opportunities for the study of human atherusclerusis, in order to confirm LDL receptor gene status in rabbits, we developed a simple PCR technique to detect LDL mutations in rabbits. Methods Rabbits genomic DNA were extracted from ear biopsy, and amplified by PCR to detect 12 bp deletion mutation in WHHL rabbits. PCR products were directly digested with Bgl Ⅰ, and then applied to polyacrylamide gel electrophoresis. Results PCR products from homozygous LDLr ＋/＋ rabbits generated 2 bands of 212 and 94 bp after Bgl Ⅰ digestion, LDLr ＋/- rabbits generated 3 bands （294, 212, and 94 bp）, LDLr -/- animals, however, generated only 1 product （294 bp）. Conclusion This modified PCR method is simple and reliable.     

硒对慢性肝病患者外周血单个核细胞膜流动性的影响

目的　探讨硒对慢性肝病患者外周血单个核细胞 (PBMC)膜流动性的影响。方法　分离健康人和慢性肝病患者的PBMC ,分别体外培养 ,对比观察了预加硒 ( 1.15 6× 10 -7mol·L-1)和不同剂量脂质过氧化诱导剂叔丁基过氧化氢 (tBHP)作用后各组PBMC膜流动性和培养液中过氧化脂质 (MDA)含量变化。结果　健康人PBMC膜流动性随tBHP剂量的增加而降低 ,培养液中MDA含量呈相反变化 ;慢性肝病患者PBMC膜流动性明显下降 ,培养液中MDA含量增加。而经硒预保护作用 6h后两组细胞上述指标均有改善。结论　脂质过氧化反应可影响人PBMC的膜流动性 ,硒对此具有保护作用。     

CREATE TRANSGENIC RABBITS BY MICROINJECTING HUMAN apoA-ⅡGENE INTO FERTILIZED EGGS

Objective To create transgenic rabbits by microinjecting human apolipoprotein A-Ⅱ (apoA-Ⅱ) gene into one-cell embryos, to study apoA-Ⅱ gene function on plasma lipoprotein metabolism and atherosclerosis. Methods Superovulation and synchronization of estrus were induced in female Japanese White Rabbits by injecting hormone, then mating with male. After collected the fertilized eggs, the human apoA-Ⅱ gene was microinjected into the male pronucleus of eggs. The injected eggs were transferred into recipient female rabbits. Last, extract DNA from the new borns ear and determine whether the newborns were transgenic by polymerase chain reaction (PCR) or Southern blot analysis. Results A total of 822 embryos with microinjection of human apoAⅡ gene were implanted into 28 recipient rabbits. The number of surviving newborns was 37. 3 transgenic positive surviving founders were found with human apoA-Ⅱ.     

促肝细胞生长素对小鼠肝纤维化的影响

用四氯化碳致小鼠肝纤维化，分别用促肝细胞生长素（PHGT）和复方丹参注射液进行实验治疗。结果显示：实验治疗组病理显示肝细胞变性坏死经，胶原纤维形成减少，肝细胞再生显著，和复方丹参注射液组相比，无显著差异；透明质酸检测肝纤维化模型组含量明显高于治疗组，而治疗组和对照组相比，无显著差异（P＞0．05）。提示PHGT有抗肝纤维化作用，PHGT对小鼠肝纤维化作用的影响主要是肝细胞得到较好的保护，减轻CCl4造成的肝细胞损伤，终止肝细胞变性坏死，抑制肝纤维化的启动因素，使肝细胞再生。     

PPARγ及其辅激活子MED1重组腺病毒的制备与生物学功能分析

目的制备大量PPARγ与MED1腺病毒,探讨其生物学功能。方法以实验室现有的腺病毒原液为材料,用HEK293a细胞包装腺病毒,CsCl梯度离心法纯化病毒,A260法测定病毒颗粒,并通过细胞感染、小鼠活体尾静脉注射病毒等实验,用HE染色法、Real-time PCR及免疫组化法进一步鉴定病毒的生物学功能。结果获得Ad/LacZ、Ad/PPARγ和Ad/MED1,其浓度分别为2.51×1012、1.57×1012、2.59×1012 VP/mL。C57BL/6J小鼠经尾静脉注射Ad/PPARγ,小鼠出现脂肪肝,肝细胞聚集大量脂滴,且PPARγmRNA和蛋白表达显著增加。同样,用Ad/MED1感染3T3-L1细胞或给小鼠尾静脉注射Ad/MED1,MED1表达水平都显著升高。结论Ad/PPARγ、Ad/MED1及对照Ad/LacZ成功制备,为体外细胞病毒感染以及活体研究PPARγ与MED1的基因功能以及网络调控奠定了实验基础。     

血浆一氧化氮与家兔动脉粥样硬化损伤的关系

目的高胆固醇饲料(HCD)诱导家兔动脉粥样硬化和高脂血症,分析家兔血浆一氧化氮(NO)水平与动脉粥样硬化损伤之间的关系。方法 20只雄性日本大耳白家兔随机分为对照组和实验组,分别饲喂正常饲料或HCD 16周,检测血脂水平,分离主动脉树,苏丹Ⅳ染色,分析动脉粥样斑块面积。苏木精伊红染色、范吉尔森弹性纤维染色以及免疫组织化学染色方法分析主动脉弓部斑块的组织学特征,检测血浆NO水平,并与动脉粥样硬化斑块面积以及斑块中巨噬细胞的表达量进行相关性分析。结果与对照组相比,实验组家兔血浆总胆固醇、甘油三酯、低密度脂蛋白胆固醇及NO水平均显著升高。实验组家兔主动脉血管内壁出现大量动脉粥样硬化斑块。动脉粥样硬化斑块面积大小及斑块内巨噬细胞表达量与血浆中NO水平呈正相关。结论在HCD诱导的家兔动脉粥样硬化斑块中,斑块面积大小及斑块中巨噬细胞表达量均与血浆NO有相关性。这提示血浆NO水平可能与动脉粥样硬化初期发生和发展相关。