肽核酸抑制HBV复制与表达的体外研究

合成肽核酸(PNA)片段,由OligofectamineTm转染至HepG2.2.15细胞与HBV各编码区保守区域相结合。用ELISA方法测定HepG2.2.15细胞中HBsAg、HBeAg滴度,PCR测定HBV DNA含量。通过计算抑制百分率,筛选有效PNA片段。结果在500 mol/L浓度下,PG3 HBsAg、HBeAg、HBV DNA表达抑制率分别为51.03%、55.38%、20.10%;PG6 HBsAg、HBeAg、HBV DNA表达抑制率分别为47.00%、43.10%、51.03%。表明PNA可由OligofectamineTm转染至HepG2.2.15细胞,从而抑制HBV的复制和抗原系统的表达。     

苦参碱与氧化苦参碱体外抗乙肝病毒的比较

目的:观察苦参碱与氧化苦参碱对HepG2.2.1 5细胞分泌HBsAg,HBeAg和Pre-S1的影响,探讨其体外抗乙型肝炎病毒作用.方法:采用HepG2.2.1 5细胞模型进行体外培养,给予不同浓度苦参碱与氧化苦参碱,作用9 d后收集上清液,用MTT法观察药物对HepG2.2.15细胞的抑制作用,用ELISA法检测上清夜中HBsAg,HBeAg和Pre-S1的分泌.结果:苦参碱与氧化苦参碱在浓度为0.001mol/L以下时对HepG2.2.1 5的生长抑制作用较小(低于25%).在浓度为1000 μmol/L到0.1 μmol/L之间,苦参碱和氧化苦参碱对HepG2.2.15细胞分泌HBsAg的抑制率均高于50%,而对HBeAg的抑制率均低于50%;浓度为0.001 mol/L时对Pre-Sl的抑制率分别为53.58%、59.33%.结论:苦参碱与氧化苦参碱均具有一定的抗HBV作用,两者无显著差别,且对HBsAg和Pre-S1的抑制效果优于拉米夫定.     

细胞内La蛋白对乙型肝炎病毒蛋白质表达的影响

目的 探讨细胞内La蛋白对HBV蛋白质表达的影响.方法 针对人La蛋白序列设计特异性的小分子干扰RNA(siRNA),通过体外转录的方法合成双链siRNA,并转染进入稳定表达HBV的HepG2.2.15细胞,实时荧光定量基因扩增技术测定HepG2.2.15细胞中的La蛋白mRNA变化水平;电化学发光分析技术检测HepG2.2.15细胞分泌的HBsAg和HBeAg变化情况.所得数据进行配对假设检验的统计学分析.结果 特异性siRNA干扰La蛋白mRNA的表达,使La蛋白在HepG2.2.15细胞中的表达降低;HepG2.2.15细胞分泌在培养上清液中的HBsAg和HBeAg表达显著下降,相关性分析显示,HBsAg、HBeAg变化水平与La蛋白mRNA变化水平呈正相关,相关系数分别为0.938和0.899.结论 特异性siRNA能够抑制细胞内La蛋白mRNA的表达,La蛋白可通过某种方式影响HBV蛋白质的表达.     

HepG2.2.15细胞模型功能的重新评价:分泌HBVDNA、cccDNA及血清学标志物的动态变化研究

目的研究HepG2.2.15细胞分泌特点及动态变化,建立稳定的抗HBV药物筛选平台。方法采用微量细胞培养法培养HepG2.2.15细胞株,于第3、6、9、12、15d收集培养上清液,采用ELISA方法检测preS1、HBsAg和HbeAg,采用Abbot试剂盒定量检测HBVDNA,采用Roche荧光定量PCR试剂盒检测HBVcccDNA。结果 HepG2.2.15细胞分泌preS1、HBsAg、HBeAg、HBVDNA的量随着细胞培养时间的延长逐渐增加,其中HBsAg在第9d达到分泌高峰,其余均在第12d达到分泌高峰。HBVcccDNA在第9d检测值仍为0,第12d时检测值达24×103copies/ml。结论 HepG2.2.15细胞具有稳定的分泌HBV病毒及相关抗原的生物学功能,是比较理想的病毒复制及抗HBVDNA药物筛选的细胞模型。本研究所用细胞株及实验方法可靠、稳定且重复性好,适用于抗HBV药物筛选等研究。     

九头狮子草水浸膏对2.2.15细胞中对HBsAg、HBeAg的分泌和HBV DNA复制的抑制作用

目的:通过观察九头狮子草水浸膏对2.2.15细胞HBsAg、HBeAg的分泌及HBV DNA复制的影响,探讨其在体外的抗乙型肝炎病毒(HBV)作用。方法:将SD大鼠(n=10)随机分为九头狮子草水浸膏组和正常血清组,前者用九头狮子草水浸膏按2.7g.kg-1.d-1剂量灌胃,后者给予生理盐水10ml.kg-1.d-1灌胃,制备不同浓度含药血清及正常血清。2.2.15细胞培养上清液HBsAg、HBeAg测定采用免疫放射分析法,HBV DNA检测采用PCR杂交试验法,测定不同浓度含药血清抗HBV活性情况。结果:含药血清作用4天、8天时,各含药血清组抑制HBsAg、HBeAg分泌的作用优于空白血清细胞对照(指含正常血清)组(P0.01、P0.05)。作用4天时,不同浓度含药血清的抗HBV作用差异无显著性意义(P0.05);作用8天时,不同浓度含药血清抑制HBeAg分泌的作用差异无显著性意义(P0.05);10%、15%含药血清抑制HBsAg分泌的作用均优于5%含药血清(P0.05),10%、15%含药血清相比较差异无显著性意义(P0.05);作用8天时,各含药血清组HBV DNA低于细胞对照组和空白血清细胞对照(指含正常血清)组(P0.01、P0.05),5%、10%含药血清组与15%含药血清组相比较差异有显著性意义(P0.05)。结论:九头狮子草水浸膏的含药血清在体外细胞培养中对2.2.15细胞分泌HBsAg、HBeAg及HBV DNA复制均有较好的抑制作用,10%含药血清的抑制作用优于5%、15%浓度。     

地塞米松、环磷酰胺和他克莫司三种免疫抑制剂影响HBV复制的体外研究

目的探讨地塞米松(DEX)、环磷酰胺(CYP)和他克莫司(FK506)在体外对HBV蛋白合成、DNA复制的影响。方法将不同浓度的DEX、CYP和FK506作用于HepG2.2.15细胞系,通过MTT实验确定药物安全浓度范围,通过检测细胞培养上清液中HBsAg和HBeAg水平,以及细胞内HBV DNA水平来评价HBV的表达和复制情况。结果DEX、CYP和FK506的药物安全浓度范围分别为0~500、0~1000和0~10μg/mL。与培养基对照处理相比,FK506处理后HBsAg、HBeAg分泌及HBV DNA复制变化差异无统计学意义;CYP处理增加HBsAg分泌,与对照相比差异有统计学意义(P0.05);但HBeAg分泌及HBV DNA复制变化差异无统计学意义;DEX作用减少HBsAg和HBeAg的分泌,与对照相比差异有统计学意义(P0.05);但是细胞内HBV DNA复制水平差异无统计学意义(P0.05)。结论在药物安全浓度范围内,FK506对HepG2.2.15细胞HBV DNA复制无直接抑制或促进作用。CYP处理后增加HepG2.2.15细胞HBsAg表达,但HBeAg表达及HBV DNA复制变化差异无促进作用;DEX处理抑制HepG2.2.15细胞HBsAg和HBeAg表达,但对HBV DNA复制无抑制作用。     

灵猫方通过增强天然免疫功能抑制乙型肝炎病毒复制的研究

目的:研究灵猫方对pHBV1.3转染Hep G2细胞的天然免疫功能的影响,探讨灵猫方抗乙肝病毒(HBV)的作用机制。方法:制备0.25mg/ml和0.5mg/ml灵猫方水提物干预HBV质粒转染HepG2细胞,以0.9%Na Cl溶液作为空白对照组,72h后收集培养上清液,ELISA法检测HBsAg和HBeAg水平;收集细胞提取总RNA,RT-PCR法检测细胞内IFN-α、IFN-β、IFN-λ1及干扰素效应蛋白OAS1、Mx A、PRKmRNA表达水平,RIG-I mRNA表达水平。结果:与空白对照组比较,0.5mg/ml灵猫方干预pHBV1.3转染Hep G2细胞分泌的HBsAg和HBeAg水平明显降低,细胞内IFN-α、IFN-β、IFN-λ1 mRNA及OAS1、Mx A、PRKmRNA表达水平表明显升高(P0.01),RIG-I mRNA表达水平明显升高(P0.01)。结论:灵猫方通过促进pHBV1.3质粒转染HepG2细胞的I、III型干扰素产生,增强天然免疫功能,从而抑制HBV复制,可能是通过RIG-I通路诱导干扰素产生,增加干扰素的形成。     

靶向乙型肝炎病毒X区的siRNAs对HepG2.2.15细胞HBV复制的抑制作用

目的观察siRNA对HBV基因表达和复制的抑制情况。方法针对HBVX区设计并化学合成4条siRNAs,观察在不同浓度下对HepG2.2.15细胞HBV复制的抑制作用。结果 siRNA在30nmoL/L浓度时,4种siRNA对HepG2.2.15细胞HbsAg和HBeAg无明显的抑制作用(P0.05);在60nmoL/L和90nmoL/L浓度下,siR-NA-1和siRNA-4有明显的抑制作用(P0.05),他们对HBsAg和HBeAg的抑制率分别为41%和43%;siRNA能降低HepG2.2.15细胞HBVDNA的拷贝数。结论化学合成的siRNAs可以有效地抑制HBV基因的表达和复制。     

蒙药乙肝1号对HBV转染细胞表达功能的影响

目的:探讨蒙药乙肝1号抗HBV药理作用。方法:采用HBV的2.2.15细胞系作为模型,观察药物对2.2.15细胞分泌HBsAg和HBeAg的抑制效果。结果:蒙药乙肝1号30mg/ml浓度对细胞有毒,最大耐受药物浓度20mg/ml时对HBsAg抑制率为57.81％,半数有效剂量(IC_(50)为5.54±3.44mg/ml,治疗指数TI为5.42±3.42;对HBeAg的抑制率为71.64％,半数有效剂量(IC_(50))为3.69±0.01mg/ml,治疗指数(TI)为6.41±0.03mg/ml。结论:提示蒙药乙肝1号煎剂在体外有一定的抗HBV作用。     

复方六月雪体外抗HBV的实验研究

目的观察复方六月雪(CLYX)体外抗乙型肝炎病毒(HBV)的作用。方法在最大无毒浓度(TC0)基础上观察不同浓度药物作用于HepG2.2.15细胞,分别在第4天和8天收集细胞培养上清液,采用实时荧光定量PCR法检测上清液HBV DNA的含量,采用ELISA法测定上清液HBsAg和HBeAg的滴度。结果无毒浓度的复方六月雪在HepG2.2.15细胞培养中可有效地抑制细胞HBV DNA的复制及HBsAg和HBeAg的分泌。结论CLYX在体外有显著的抗HBV的作用。     

Inhibition of hepatitis B virus gene expression and replication by artificial microRNA

AIM： To investigate the inhibitory effects of hepatitis B virus （HBV） replication and expression by transfecting artificial microRNA （amiRNA） into HepG2.2.15 cells. METHODS： Three amiRNA-HBV plasmids were constructed and transfected into HepG2.2.15 cells. HBV antigen secretion was detected in the cells with transient and stable transfection by time-resolved fluoroimmunoassays （TRFIA）. HBV DNA replication was examined by ？ uorescence quantitative PCR, and the level of HBV S mRNA was measured by semi- quantitative RT-PCR. RESULTS： The efficiency of transient transfection of the vectors into 2.2.15 cells was 55%-60%. All the vectors had significant inhibition effects on HBsAg and HBeAg at 72 h and 96 h after transfection （P 〈 0.01 for all）. The secretion of HBsAg and HBeAg into the supernatant was inhibited by 49.8% ± 4.7% and 39.9% ± 6.7%, respectively, at 72 h in amiRNA- HBV-S608 plasmid transfection group. The copy of HBV DNA within culture supernatant was also significantly decreased at 72 h and 96 h after transfection （P 〈0.01 for all）. In the cells with stable transfection, the secretion of HBsAg and HBeAg into the supernatant was significantly inhibited in all three transfection groups （P 〈 0.01 for all, vs negative control）. The copies of HBV DNA were inhibited by 33.4% ± 3.0%, 60.8% ± 2.3% and 70.1% ± 3.3%, respectively. CONCLUSION： In HepG2.2.15 cells, HBV replication and expression could be inhibited by artif icial microRNA targeting the HBV S coding region. Vector-based artificial microRNA could be a promising therapeutic approach for chronic HBV infection.     

Combination of small interfering RNA and lamivudine on inhibition of human B virus replication in HepG2.2.15 cells

AIM: To observe the inhibition of hepatitis B virus (HBV) replication and expression by combination of siRNA and lamivudine in HepG2.2.15 cells. METHODS: Recombinant plasmid psil-HBV was constructed and transfected into HepG2.2.15 cells. The transfected cells were cultured in lamivudine-containing medium (0.05 μmol/L) and harvested at 48, 72 and 96 h. The concentration of HBeAg and HBsAg was determined using ELISA. HBV DNA replication was examined by real- time PCR and the level of HBV mRNA was measured by RT-PCR. RESULTS: In HepG2.2.15 cells treated with combination of siRNA and lamivudine, the secretion of HBeAg and HBsAg into the supernatant was found to be inhibited by 91.80% and 82.40% (2.89 ± 0.48 vs 11.73 ± 0.38, P < 0.05; 4.59 ± 0.57 vs 16.25 ± 0.48, P < 0.05) at 96 h, respectively; the number of HBV DNA copies within culture medium was also significantly decreased at 96 h (1.04 ± 0.26 vs 8.35 ± 0.33, P < 0.05). Moreover, mRNA concentration in HepG2.2.15 cells treated with combination of siRNA and lamivudine was obviously lower compared to those treated either with siRNA or lamivudine (19.44 ± 0.17 vs 33.27 ± 0.21 or 79.9 ± 0.13, P < 0.05). CONCLUSION: Combination of siRNA and lamivudine is more effective in inhibiting HBV replication as compared to the single use of siRNA or lamivudine in HepG2.2.15 cells.     

Inhibition of hepatitis B virus expression and replication by RNA interference in HepG2.2.15

INTRODUCTION Hepatitis B is a severe infectious disease threatening peoples’ health all over the world. There is still no efficient therapy to control HBV persistent replication, which may lead to the development of liver cirrhosis and hepatocellualar ca…     

长片段RNA抑制HepG2.2.15细胞中HBV基因的表达和复制

目的 评估长的反义RNA干扰片段在培养细胞株中对HBV复制的抑制效应.方法将HBV基因组S区的全部核苷酸序列插入至pTARGETTM载体中,并将重组载体转染入HepG2.2.15细胞中.用酶联免疫吸附法检测HBsAg与HBeAg水平,用荧光定量PCR法检测HBVDNA水平.对数据采用多个独立样本Kruskal-Wallis检验与两两比较的Mann-Whitney U检验.结果 经过处理后,HepG2.2.15细胞上清液中HBsAg表达量(A值)在HBS2组(携带长片段反义RNA)为0.621±0.027,在HBS4组(携带正义RNA)为3.399±0.018,对照组为2.232±0.187;HBeAg表达量(A值)在HBS2组、HBS4组和对照组分别为0.749±0.019、1.548±0.025和1.570±0.044; HBV DNA水平(×104拷贝/ml)在HBS2组、HBS4组、对照组分别为1.597±0.082、3.381±0.297和3.610±0.063.与对照组相比,HBS2组HBsAg、HBeAg和HBV DNA表达量均降低,统计量Z值均为-2.309,P值均＜0.05; HBS4组HBsAg表达量增高(Z=-2.309,P＜0.05),而HBeAg和HBV DNA表达量无明显差异,统计量Z值分别为-0.866、-1.155,P值均＞0.05.结论 长片段反义RNA能抑制HBV基因的表达和病毒复制.

Abstract：

Objective To evaluate the inhibitory effects of long antisense RNA on HBV replication in HepG2.2.15 cells. Methods The coding region of HBV S gene was cloned into pTARGET vector in sense and antisense orientations and the recombinant plasmids were transfected into HepG2.2.15 cells which were divided into HBS2 (antisense RNA) group, HBS4 (sense RNA) group and control group. HBsAg and HBeAg in the culture supernant were detected by ELISA. The HBV DNA in the supernant was quantified by real-time PCR. Results After treatment, the levels of HBsAg in HepG2.2.15 cell supernatants of three groups were 0.621 ± 0.027, 3.399 ± 0.018 and 2.232 ± 0.187 respectively; the levels of HBeAg were 0.749 ± 0.019,1.548 ± 0.025 and 1.570 ± 0.044 respectively and the levels of HBV DNA were 1.597 ± 0.082, 3.381 ± 0.297 and 3.610 ± 0.063 respectively. The expressions of HBsAg and HBeAg and the HBV DNA level in HBS2 group were remarkably reduced as compared to the control (Z = -2.309, P ＜ 0.05); whereas the sense plasmid transfection (HBS4) did not affect HBeAg (Z= -0.866) and HBV DNA (Z = -1.155) levels in the culture supernant but slightly increased the HBsAg level (Z = -2.309). Conclusion Antisense RNA might be a useful tool to repress HBV replication.     

肝舒胶囊在体外细胞培养中抗HBV活性的研究

目的研究肝舒胶囊在2.2.15细胞培养中抗乙型肝炎病毒(HBV)作用。方法用2.2.15细胞体外培养.对肝舒胶囊抗HBV活性进行评价。结果肝舒胶囊5g／L加药后4d对2.2.15细胞HBsAg和HBeAg的抑制率为51.16％和74.83％,在加药后第8天抑制作用达高峰,对HBsAg和HBeAg的抑制率分别为75.72％和80.02％。药物作用12d时．其治疗指数可达7.73和5.39。结论肝舒胶囊在体外细胞培养中对HBsAg和HBeAg的分泌均有较好的抑制作用。     

减毒水痘病毒对乙型肝炎病毒复制的影响

目的观察减毒水痘病毒对乙型肝炎病毒复制的影响。方法分别用减毒水痘病毒接种鸭乙型肝炎模型和HepG22.2.15细胞,以斑点杂交和EIA方法分别检测鸭血清中DHBVDNA和细胞培养上清液中HBsAg、HBeAg的含量。结果减毒水痘病毒两个剂量组均显示鸭血清病毒量下降,200pfu/kg组在给药后第10天和停药5d时,DHBVDNA吸光度（A）平均值分别由给药前1.17±0.29降至0.59±0.45和0.21±0.21,相比差异有显著性（t＝3.51,P＜0.01和t＝7.54,P＜0.001）;400pfu/kg组在给药后第5、10天DHBVDNA无下降,停药5d时DHBVDNAA平均值由给药前0.70±0.25降至0.32±0.17,差异有显著性（t＝3.58,P＜0.01）;减毒水痘病毒对2.2.15细胞分泌HBeAg、HBsAg均有抑制作用,最大抑制率分别为61%和33%,对HBeAg的抑制较HBsAg强。结论减毒水痘病毒在鸭乙型肝炎模型上可以显著降低血清DHBVDNA水平;在体外能够直接抑制2.2.15细胞分泌HBsAg、HBeAg,提示该病毒可能对乙型肝炎病毒复制有干扰或抑制作用。     

APOBEC3F剪接亚型与全长APOBEC3F、APOBEC3G对乙肝病毒作用的比较

目的比较APOBEC3F剪接亚型3F79与完整APOBEC3F以及APOBEC3G对HepG2.2.15细胞中HBV DNA复制及HBsAg、HBeAg抗原分泌的影响。方法用PCR合成法扩增人APOBEC3F剪接亚型3F79,构建真核表达载体pEGFPC1-3F79和原核表达质粒pET28a-3F79,将pEGFPC1-3F79与含有全长APOBEC3F和APOBEC3G的质粒Pflag-APOBEC3F、PC-APOBEC3G-HA转染入HepG2.2.15中,检测转染后细胞上清中HBV DNA以及HBsAg和HBeAg的水平。结果构建的重组载体经酶切和PCR鉴定,表明3F79基因正确地插入。将pEGFPC1-3F79与Pflag-APOBEC3F、PC-APOBEC3G-HA转染HepG2.2.15细胞后,pEGFPC1-3F79对细胞中HBV的复制及HBsAg和HBeAg的分泌无明显的抑制作用(P0.05),而转染含有完整APOBEC3F和APOBEC3G质粒的HepG2.2.15细胞与对照组相比,HBsAg、HBeAg、HBV DNA含量明显下降,差异有统计学意义(P0.05)。结论 3F79不能像完整APOBEC3F和APOBEC3G一样抑制HepG2.2.15细胞中HBV DNA复制以及抗原的分泌。     

Antisense oligonucleotide targeting at the initiator of hTERT arrests growth of hepatoma cells

AIM:To evaluate the inhibitory effect of antisense phosphorothioate oligonucleotide (asON) complementary to the initiator of human telomerase catalytic subunit (hTERT) on the growth of hepatoma cells.METHODS:The as-hTERT was synthesized by using a DNA synthesizer. HepG2.2.15 cells were treated with ashTERT at the concentration of 10μmol/L. After 72h, these cells were obtained for detecting growth inhibition,telomerase activity using the methods of MTT,TRAP-PCR-ELISA, respectively. BALB/c(nu/nu) mice were injected HepG2.2.15 cells and a human-nude mice model was obtained. There were three groups for anti-tumor activity study. Once tumors were established, these animals in the first group were administered as-hTERT and saline.Apoptosis of tumor cells was detected by FCM. In the 2nd group, the animals were injected HepG2.2.15 cells together with as-hTERT. In the third group, the animals were given as-hTERT 24 hours postinjection of HepG2.2.15 cells. The anti-HBV effects were assayed with ELISA in vitro and in vivo.RESULTS: Growth inhibition was observed in cells treated with as-hTERT in vitro. A significant different in the value of A570-A630 was found between cells treated with as-hTERT and control (P&lt;0.01) by MTT method. The telomerase activity of tumor cells treated with as-hTERT was reduced,the value of A4so nm was 0.42 compared to control (1.49) with TRAP-PCR-ELISA. The peak of apoptosis in tumor cells given as-hTERT was 21.12%, but not seen in saline-treated control. A prolonged period of carcinogenesis was observed in the second and third group animals. There was inhibitory effect on the expression of HBsAg and HBeAg in vivo and in vitro.CONCLUSION: As-hTERT has an anti-tumor activity, which may be useful for gene therapy of tumors.     

三螺旋形成寡核苷酸抑制乙型肝炎病毒复制及抗原合成的实验研究

目的 探讨三螺旋形成寡核苷酸抗乙型肝炎病毒（ＨＢＶ）作用。方法 针对ＨＢＶ核心启动子ＳＰ１位点,合成２１ｍｅｒ硫代磷酸三螺旋形成寡核苷酸及２１ｍｅｒ无关对照寡核苷酸。采用ＬＥＩＳＡ,斑点杂交法分别检测了经寡核苷酸处理的ＨｅｐＧ２．２．１５细胞及空白对照组细胞培养上清ＨＢｓＡｇ,ＨＢｅＡｇ及ＨＢＶ ＤＮＡ水平。结果 ＴＦＯ２１组２．２．１５细胞ＨＢｓＡｇ及ＨＢＶ ＤＮＡ分泌量明显低于空白对照组。ＴＦ