Effect of IL-18 on peripheral blood mononuclear cells of chronic hepatitis B and hepatitis B virus DNA released by HepG2.2.15 cell lines

BACKGROUND: Interleukin-18 (IL-18), a pro-inflamma- tory cytokine that induces interferon-γ (IFN-γ) production in T cells and natural killer cells, plays a critical role in the T-lymphocyte helper type 1 ( Th1) response. This study was designed to explore the effect of IL-18 on peripheral blood mononuclear cells ( PBMCs) derived from chronic hepatitis B (CHB) and on hepatitis B virus (HBV) DNA released by HepG2.2.15 cell lines, which were transfected with hepatitis B virus gene in vitro. METHODS: PBMCs isolated from 25 healthy people and 25 patients with CHB were stimulated with HBcAg and IL-18 of various concentrations for 72 hours. The levels of IFN-γ in the supernatants of cultured PBMCs were determined by ELISA. After the stimulation of IL-18 of various concentra- tions, PBMCs derived from one patient were co-cultured for 96 hours with HepG2. 2. 15 cells which had been cul- tured for 24 hours, and then the supernatants were collected by centrifugation and used for HBV DNA quantitative as- say. RESULTS: When PBMCs were stimulated by HBcAg and IL-18 at various concentrations, the levels of IFN-γ in the supernatants of CHB groups were much higher than those in normal control groups, at 0.2 ng/ml: t =11.70, P< 0.01; at 1.0 ng/ml: t =16.19, P<0.01; and at5.0 ng/ml: t =20.12, P <0.01. In the CHB groups, the levels of IFN-γ in the supernatants of PBMCs stimulated by HBcAg alone were lower than both those stimulated by HBcAg and EL-18 at various concentrations and those stimulated by HBcAg and EL-18 (5.0 ng/ml) together with EL-12 (mild: t = 2.20, P<0.05; moderate; t=2.97, P<0.05; severe; t = 0.66, P >0.05). The content of HBV DNA in the superna- tant of co-cultivation of HepG2. 2. 15 cells and PBMCs without stimulated materials was higher than that stimula-ted by HBcAg and EL-18 at various concentrations of HBc- Ag and IL-18 together with IL-12/IFN-α1lb. CONCLUSION: DL-18 can induce IFN-γ secretion and pro- bably play a key role in the modulation of both innate and adaptive immunity. It has implications in improving im- munoregulatory effect and increasing the ability of immune cells to kill cells infected by virus.

Establishment and characterization of four human hepatocellular carcinoma cell lines containing hepatitis B virus DNA

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Tea Polyphenols Exerts Anti-hepatitis B Virus Effects in a Stably HBV-transfected Cell Line

In this study, the anti-HBV effects of tea polyphenols （TP） were examined. After cells were exposed to TP for 3, 6, 9 days, amounts of HBsAg, HBeAg and HBV-DNA released into the supernatant of the cultured HepG2 2.2.15 cells were detected. TP, to some extent, inhibited the secretion of HBsAg and strongly suppressed the secretion of HBeAg in a dose-dependent （P〈0.01） and time-dependent manner, with 50% maximal inhibitory concentration （IC50） value being 7.34μg/mL on the 9th day, but the time-dependence was not significant （P=0.051）. Expression of HBV-DNA in the supernatant of the cell culture also was significantly decreased in a dose-dependent fashion （P〈0.01）. The ICS0 of TP in inhibiting HBV DNA was 2.54 pg/mL. It concluded that TP possessed potential anti-HBV effects and may be used as a treatment alternative for HBV infection.

Efficacies of β-L-D4A against Hepatitis B virus in 2.2.15 cells

AIM:To investigate the antiviral effect of beta-L-enantiomer of 2',3'-didehydro-2',3'-dideoxyadenosine (β-L-D4A) on 2.2.15 cells transfected with the hepatitis B virus (HBV) genome. METHODS:Lamivudine (3TC) as a positive control. Then, HBV DNA in treated 2.2.15 cells and the Hepatitis B surface antigen (HBsAg) in the culture supernatants were detected to determine the inhibitory effect of β-L-D4A. At the same time, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) was used to detect the survival ratio of 2.2.15 cells. RESULTS:β-L-D4A has a dose-dependent inhibitory effect on HBV DNA replication;this effect was apparent when the concentration was above 1 mol/L. When β-L-D4A was at the highest concentration, 100 mol/L, the HBsAg inhibition ratio was above 50%. The Therapeutic index (TI) of β-L-D4A was above 2.1. CONCLUSION:β-L-D4A has a dose-dependent inhibitory effect on the replication of HBV DNA and the secretion of HBsAg at low toxicity.

Construction of a replication-competent hepatitis B virus vector carrying secreted luciferase transgene and establishment of new hepatitis B virus replication and expression cell lines

BACKGROUND Previously,we have successfully constructed replication-competent hepatitis B virus(HBV)vectors by uncoupling the P open reading frame(ORF)from the preC/C ORF to carefully design the transgene insertion site to overcome the compact organization of the HBV genome and maintain HBV replication competence.Consequently,the replication-competent HBV vectors carrying foreign genes,including pCH-BsdR,carrying blasticidin resistance gene(399 bp),and pCH-hrGFP,carrying humanized renilla green fluorescent protein gene(720 bp),were successfully obtained.However,the replication efficiency of the former is higher but it is tedious to use,while that of the latter is poor and cannot be quantified.Hence,we need to search for a new reporter gene that is convenient and quantifiable for further research.AIM To establish a helpful tool for intracellular HBV replication and anti-viral drugs screening studies.METHODS We utilized the replication-competent HBV viral vectors constructed by our laboratory,combined with the secreted luciferase reporter gene,to construct replication-competent HBV vectors expressing the reporter gene secretory Nanoluc Luciferase(SecNluc).HepG2.TA2-7 cells were transfected with this vector to obtain cell lines with stably secreted HBV particles carrying secNluc reporter gene.RESULTS The replication-competent HBV vector carrying the SecNluc reporter gene pCHsNLuc could produce all major viral RNAs and a full set of envelope proteins and achieve high-level secreted luciferase expression.HBV replication intermediates could be produced from this vector.Via transfection with pTRE-sNLuc and selection by hygromycin,we obtained isolated cell clones,named HBV-NLuc-35 cells,which could secrete secNLuc recombinant viruses,and were sensitive to existing anti-HBV drugs.Using differentiated HepaRG cells,it was verified that recombinant HBV possessed infectivity.CONCLUSION Our research demonstrated that a replication-competent HBV vector carrying a secreted luciferase transgene possesses replication and expression ability,and the established HBV replication and expression cell lines could stably secrete viral particles carrying secNluc reporter gene.More importantly,the cell line and the secreted recombinant viral particles could be used to trace HBV replication or infection.

Effects of SAHA on proliferation and apoptosis of hepatocellular carcinoma cells and hepatitis B virus replication

AIM: To investigate the effects of suberoylanilide hydroxamic acid(SAHA) on proliferation and apoptosis of a human hepatocellular carcinoma cell line(HepG2.2.15) and hepatitis B virus(HBV) replication.METHODS: HepG2.2.15 cells were treated with different concentrations of SAHA.Cell morphology was examined by confocal laser scanning microscopy,and cell proliferation was determined using a MTT colorimetric assay.Flow cytometry was used to detect apoptosis and determine cell cycle phase,while hepatitis B surface antigen and hepatitis B e antigen content were measured using chemiluminescence.Reverse transcription polymerase chain reaction was performed to measure HBV DNA in cell lysate.RESULTS: Cell proliferation rates were significantly reduced by the addition of SAHA.The inhibitory effect of SAHA on cell proliferation was both time-and dosedependent.After 24 h of treatment with SAHA,the early cell apoptotic rate increased from 3.25% to 21.02%(P = 0.041).The proportion of G0 /G1 phase cells increased from 50.3% to 65.3%(P = 0.039),while that of S phase cells decreased from 34.9% to 20.6%(P = 0.049).After 48 h of treatment,hepatitis B surface antigen and hepatitis B e antigen content increased from 12.33 ± 0.62 to 25.42 ± 2.67(P = 0.020) and 28.92 ± 1.24 to 50.48 ± 1.85(P = 0.026),respectively.Furthermore,HBV DNA content increased from 4.54 ± 0.46 to 8.34 ± 0.59(P = 0.029).CONCLUSION: SAHA inhibits HepG2.2.15 cell proliferation,promotes apoptosis,and stimulates HBV replication.In combination with anti-HBV drugs,SAHA may potentially be used cautiously for treatment of hepatocellular carcinoma.

Regulation of microRNA by hepatitis B virus infection and their possible association with control of innate immunity

Hepatitis B virus(HBV)chronically infects more than350 million people worldwide.HBV causes acute and chronic hepatitis,and is one of the major causes of cirrhosis and hepatocellular carcinoma.There exist complex interactions between HBV and the immune system including adaptive and innate immunity.Tolllike receptors(TLRs)and TLR-signaling pathways are important parts of the innate immune response in HBV infections.It is well known that TLR-ligands could suppress HBV replication and that TLRs play important roles in anti-viral defense.Previous immunological studies demonstrated that HBV e antigen(HBeAg)is more efficient at eliciting T-cell tolerance,including production of specific cytokines IL-2 and interferon gamma,than HBV core antigen.HBeAg downregulates cytokine production in hepatocytes by the inhibition of MAPK or NF-κB activation through the interaction with receptor-interacting serine/threonine protein kinase.MicroRNAs(miRNAs)are also able to regulate various biological processes such as the innate immune response.When the expressions of approximately 1000 miRNAs were compared between human hepatoma cells HepG2 and HepG2.2.15,which could produce HBV virion that infects chimpanzees,using real-time RT-PCR,we observed several different expression levels in miRNAs related to TLRs.Although we and others have shown that HBV modulates the host immune response,several of the miRNAs seem to be involved in the TLR signaling pathways.The possibility that alteration of these miRNAs during HBV infection might play a critical role in innate immunity against HBV infection should be considered.This article is intended to comprehensively review the association between HBV and innate immunity,and to discuss the role of miRNAs in the innate immune response to HBV infection.

Synergistic effect of a novel oxymatrine-baicalin combination against hepatitis B virus replication, a smooth muscle actin expression and typeⅠcollagen synthesis in vitro

AIM: To study the effect of oxymatrine-baicalin combination (OB) against HBV replication in 2.2.15 cells and a smooth muscle actin (αSMA) expression, typeⅠ, collagen synthesis in HSC-T6 cells. METHODS: The 2.2.15 cells and HSC-T6 cells were cultured and treated respectively. HBsAg and HBeAg in the culture supernatants were detected by ELISA and HBV DNA levels were determined by fluorescence quantitative PCR. Total RNA was extracted from HSC-T6 cells and reverse transcribed into cDNA. The cDNAs were amplified by PCR and the quantities were expressed in proportion to p actin. The total cellular proteins extracted from HSC-T6 cells were separated by electrophoresis. Resolved proteins were electrophoretically transferred to nitrocellulose membrane. Protein bands were revealed and the quantities were corrected by p actin. RESULTS: In the 2.2.15 cell culture system, the inhibitory rate against secretion of HBsAg and HBeAg in the OB group was significantly stronger than that in the oxymatrine group (HBsAg, P=0.043; HBeAg, P=0.026; respectively); HBV DNA level in the OB group was significantly lower than that in the oxymatrine group (P = 0.041). In HSC-T6 cells the mRNA and protein expression levels of a SMA in the OB group were significantly lower as compared with those in the oxymatrine group (mRNA, P = 0.013; protein, P-0.042; respectively); The mRNA and protein expression levels of typeⅠcollagen in the OB group were significantly lower as compared with those in the oxymatrine group (mRNA, P<0.01; protein, P<0.01; respectively). CONCLUSION: OB combination has a better effect against HBV replication in 2.2.15 cells and is more effective against a SMA expression and typeⅠcollagen synthesis in HSC-T6 cells than oxymatrine in vitro.

The effect of mycophenolate acid on hepatitis B virus replication in vitro

OBJECTIVE: To use 2.2.15 cell line to determine the effects of mycophenolate acid (MPA) on hepatitisB virus (HBV) replication and viral protein synthesis in vitro.METHODS: The 2.2.15 cells were treated with different concentration of MPA (1-50 μg/ml) for 12days. HBsAg and HBeAg were detected in the supernatant fluid by ELISA and intracellular HBV DNAwas analyzed quantitatively by slot blot hybridization.RESULTS: MPA could suppress the expression of HBsAg and HBeAg, and the higher concentration ofMPA induced lower expression of HBsAg and HBeAg. The suppression rates of MPA for HBsAg andHBeAg at a concentration of 50 μg/ml were 34.2% and 24.1% respectively. The expression of HBVDNA was only 49% as compared with controls when treated with MPA at a concentration of 50 μg/ml.CONCLUSIONS: Mycophenolate acid can suppress the expression of HBsAg and HBeAg as well as thereplication of HBV DNA in the 2.2.15 cell. The suppressive degree is dose-dependent.

Interleukin-10 Is Expressed in HepG2.2.15 Cells and Regulated by STAT1 Pathway

This study investigated the expression profiles of IL-10 gene in three human hepatoma cell lines including Huh7, HepG2, and HepG2 transfected with a plasmid containing hepatitis B virus （HBV） named HepG2.2.15. RT-PCR analysis demonstrated that IL-10 message RNA was absent in HepG2 and Huh7 cells, whereas it was present in HepG2.2.15 cells, which was consistent with ELISA result. Furthermore, except for lamivudine other antiviral treatments did not significantly decrease the HBV DNA level in HepG2.2.15 cells, while they had different effects on the expression of IL-10 protein, although stimulation by LPS had no significant effect. In addition, except for poly（I：C）, the other treatments decreased the expression of IL-10 protein to different degrees, but had no sig-nificant effects on the expression of NF-κB and MyD88. Meanwhile, all treatments we used had effect on the expression of STAT1. In conclusion, IL-10 was expressed in HepG2.2.15 cells and STAT1 pathway might be involved in the regulation of IL-10 expression in HepG2.2.15 cells, but it was not the sole pathway, the exact mechanism warrants further study.

甘草甜素对HBsAg低表达HepG2.2.15细胞株HBV感染及TLR2、4的影响

目的:探讨甘草甜素(GL)对HepG2.2.15细胞上清HBV DNA、e抗原分泌,Toll样受体2、4(TLR2、4)信号分子的表达及对细胞增殖的影响。方法:实时荧光定量PCR检测HBV DNA表达,ELISA检测HBV所分泌抗原,MTT检测细胞增殖活性,直接免疫荧光流式细胞术(FCM)检测TLR2、4在细胞株上表达的阳性细胞率,并与空白对照组对比。结果:HBsAg在该细胞株低表达,但HBeAg则明显阳性,因此研究了GL对e抗原的影响,给药后第3d e抗原总体均数间差异显著(P<0.01),但只有400μg/ml组与对照组间比较显著降低(P<0.05),800μg/ml组则较其余GL组明显升高(P<0.01)。HBV DNA给药后第3 d总体均数间比较差异有显著性,只有50μg/ml组较对照组降低,但无统计学意义(P>0.05),其余各组均较对照组升高;各组TLR2、4数值总体均数间有显著差异(P<0.01)。除200μg/ml组外,各剂量组与对照组比较显示两者均显著上调(P<0.05),但均无剂量依赖关系;MTT实验显示200μg/ml以下三个剂量组均可促进细胞增殖,但只有200μg/ml组与对照组间差异显著(P<0.05);400、800μg/ml两组均显著抑制细胞增殖(P<0.01);而MTT分别与HBeAg、HBV DNA呈显著负相关(P<0.05)。结论:研究表明,GL对HepG2.2.15变异株的病毒复制及e抗原分泌可能具有双向作用;细胞的存活数与病毒复制及e抗原呈负相关;TLR2在变异株低表达,GL呈非剂量依赖关系上调TLR2、4表达,至少在该细胞株GL影响HBV的机理与TLR2、4信号的改变无关,但有可能在体内通过免疫途径影响HBV。

甘草甜素对HepG2.2.15细胞株HBV感染的影响

目的探讨甘草甜素(GL)对HepG2.2.15细胞上清液中HBsAg、HBeAg、HBV DNA的作用,及对细胞存活率的影响。方法实时荧光定量PCR检测HBV DNA的表达,ELASA检测HBV所分泌抗原,MTT检测细胞的增殖活性,计算细胞存活率。结果给药后各组HBsAg分泌结果显示总体均数间差异显著(P=0.000),GL各组与对照组比较差异有统计学意义(P<0.01),抑制作用存在剂量依赖关系;而对HBeAg水平的影响因剂量不同而表现为升高和降低两种趋势,除50μg/mL组外,其余各组与对照组比较,差异均有统计学意义(P<0.05),但800μg/mL组HBeAg分泌增加,400μg/mL以下组为HBeAg降低;HBV DNA的表达显示GL各组与对照组比较,差异均有统计学意义(P<0.05),但400μg/mL以下组为HBV DNA降低,800μg/mL组出现HBV DNA复制增强;MTT实验显示,200μg/mL以下3个剂量组均可促进细胞增殖(P<0.01),400、800μg/mL2组均显著抑制细胞增殖(P<0.01);MTT分别与HBeAg和HBV DNA水平呈显著负相关(P<0.01),但与HBsAg呈显著正相关(r=0.869,P=0.000)。结论GL对HepG2.2.15细胞株上清中的HBeAg和HBV DNA水平可能具有双向作用,而对HBsAg具有剂量依赖的抑制作用,提示GL的使用应注意选择适应证及合适的剂量。

刺参糖胺聚糖对HepG2.2.15细胞分泌HBsAg和HBeAg的影响

目的:研究刺参糖胺聚糖对HepG2.2.15细胞HBsAg和HBeAg的抑制作用。方法:采用不同浓度的刺参糖胺聚糖作用于HepG2.2.15细胞,MTT法检测药物的细胞毒性,ELISA法检测培养上清中的HBsAg和HBeAg。结果:刺参糖胺聚糖对HepG2.2.15细胞分泌HBsAg和HBeAg的抑制作用存在时间和浓度依赖性。与对照组相比,给予8、4、2及1mg/mL4种不同浓度的刺参糖胺聚糖作用3、6d后,各药物处理组均能显著抑制HBsAg和HBeAg的分泌(P<0.01)。结论:刺参糖胺聚糖具有一定的抗HBV活性。

甘草甜素对HepG2.2.15细胞株HBeAg水平及TLR4表达的影响

目的探讨甘草甜素(GL)对HepG2.2.15细胞上清HBeAg分泌,Toll样受体4(TLR4)信号分子的表达及对细胞增殖的影响。方法实时荧光定量PCR检测TLR4表达;直接免疫荧光流式细胞术(FCM)检测表达TLR4的阳性细胞率;ELASA检测HBV所分泌抗原;MTT检测细胞增殖活性,并与空白对照组比较。结果给药后HBVe抗原(HBeAg)的分泌结果显示,总体均数间差异显著(P<0.05),但甘草甜素各组与对照组比较差异无统计学意义;GL各组TLR4 mRNA及流式细胞TLR4的表达总体均数间均有显著差异(P<0.01),分别与对照组相比差异有显著性(P<0.01),100μg/mL组尤其明显;MTT实验显示,200μg/mL以下三个剂量组均可促进细胞增殖,50μg/mL组与对照组间差异显著(P<0.05);400μg/mL、800μg/mL两组均显著抑制细胞增殖(P<0.01);而MTT结果与HBeAg水平呈显著负相关(P<0.01),与TLR4表达无相关关系(P>0.05)。结论研究表明,甘草甜素对HepG2.2.15的e抗原分泌可能具有双向作用;细胞的存活率与e抗原呈负相关;TLR4在HepG2.2.15细胞株低表达,GL可上调TLR4表达,甘草甜素可影响先天免疫中的TLR4信号分子,有可能在体内通过免疫途径影响HBV复制和抗原分泌。

胎盘免疫调节因子对HepG 2.2.15细胞毒性及HBV DNA分泌作用的影响

目的观察胎盘免疫调节因子（PF）在体外的抗乙肝病毒（HBV）作用及安全性。方法将质量浓度分别为0．032—20．000mg／ml的PF作用于体外培养的人肝癌细胞系HepG 2．2．15细胞，通过MTT比色法观察细胞增殖抑制率及半数毒性质量浓度（TC50），以荧光定量PCR法检测HBV DNA水平（以拉米夫定为阳性对照组）。结果PF处理后细胞增殖抑制率为0．75％～58．21％且呈浓度依赖性，作用72h后TC50为13．61mg／ml；PF作用72h和144h后，细胞上清液中HBV DNA拷贝量显著降低，与阳性对照组水平相似。结论PF在体外有显著抗HBV作用，且细胞毒性较小。

HBV preS2反义锁核酸在HepG22.2.15细胞内的抗病毒效果

目的:探讨针对HBVpreS2基因mRNA翻译起始区的反义锁核酸(LNA)片段在2.2.15细胞内抗HBV复制和表达的作用.方法:分别合成三段互补于HBV preS2基因mRNA翻译起始区同一靶位的反义锁核酸、全硫代反义寡核苷酸、未修饰寡核苷酸及无关对照序列,以阳离子脂质体作为载药体系作用于HepG22.2.15细胞,采用时间分辨免疫荧光技术(TRFIA)和荧光定量聚合酶链技术(FQ-PCR)动态检测细胞上清液中HBsAg和HBV DNA的含量,并比较其抑制HBV DNA复制与表达的作用;以四甲基偶氮唑蓝(MTT)法检测LNA对细胞的毒性.结果:加入LNA后第1天,即出现对HBsAg表达和HBV DNA复制的抑制作用,第7天,未修饰反义寡核苷酸组、全硫代修饰反义寡核苷酸组、反义锁核酸组对HBsAg表达的抑制率分别达45.79%、52.92%和67.21%;对HBV DNA复制的抑制率分别达35.15%、40.69%和52.16%.其中LNA抑制病毒活性最强且对细胞代谢无影响.各组与对照组比较均有显著性差异(均P<0.01),且反义LNA组与其他ASODN组比较也有显著性差异(均P<0.05).结论:针对preS2基因的反义锁核酸体外能有效抑制HBV的复制与表达,故preS2基因可作为乙型肝炎基因治疗的有效靶位.

pGenesil-siHBV X对HepG2.2.15细胞HBV表达和复制的抑制效果研究

目的研究针对HBVX基因区设计的小干扰RNA(siRNA)表达载体质粒pGenesil-siHBVX对HepG2.2.15细胞HBV表达和复制的抑制效果及特异性。方法针对HBVX区设计siRNA表达载体质粒pGenesil-siHBVX。分别用培养液(空白对照)、脂质体Metafectene、pGenesil空载体、pGenesil-siHK(阴性对照)、pGenesil-siAFP(特异性对照)、pGenesil-siHBVX处理或转染HepG2.2.15细胞各3次。于每次转染后24h,取各组细胞培养上清液,用时间分辨荧光免疫测定技术检测上清液中HBsAg和HBeAg含量,用化学发光法检测AFP含量,用PCR荧光定量技术检测HBV-DNA复制水平。结果pGenesil-siHBVX转染能抑制HepG2.2.15细胞对HBV标志物的表达,且抑制作用随转染次数增加而增强。第3次转染后,pGenesil-siHBVX组细胞上清液中HBsAg、HBeAg和HBV-DNA检测结果分别为(6.26±1.07)ng/ml、(0.13±0.05)Ncu/ml和(3.01±0.40)×107拷贝/ml,与空白对照组的(22.50±1.39)ng/ml、(1.12±0.11)Ncu/ml和(12.33±1.28)×107拷贝/ml比较,差异有统计学意义(t值分别为12.80、12.21、9.71,P<0.05);pGenesil-siHBVX转染不影响细胞对AFP的表达(t=0.18,P=0.86)。结论pGenesil-siHBVX可以有效和特异地抑制HepG2.2.15细胞HBV-DNA的复制及HBsAg和HBeAg表达。

PTD-HBcAg融合蛋白诱导特异性CTL在HepG2.2.15细胞抑制HBV复制的研究

目的探讨PTD-HBcAg融合蛋白诱导小鼠体内特异性CTL并抑制HepG2.2.15细胞HBV复制的作用。方法 PTD-HBcAg、HBcAg和阴性对照分别与等体积的弗氏佐剂乳化后皮下免疫小鼠;第14d,分离脾淋巴细胞并分别用PTD-HBcAg、HBcAg、PTD和PBS加强刺激后收集上清,检测细胞因子IFN-γ、IL-12、IL-4和IL-10;刺激后的淋巴细胞作为效应细胞与HepG2.2.15细胞共培养,检测,效应细胞对HBsAg、HBVDNA的抑制作用及对HepG2.2.15细胞、HepG2细胞的杀伤效果。结果 PTD-HBcAg组分泌的IFN-γ、IL-12、IL-4和IL-10与HBcAg组和阴性对照组比较差异有统计学意义(P<0.05);PTD-HBcAg融合蛋白组较HBcAg组和阴性对照组有更明显的病毒抑制作用(P<0.05);PTD-HBcAg组对HepG2.2.15细胞的杀伤率明显高于HBcAg组和阴性对照组(P<0.05)。结论 PTD-HBcAg可诱导HBV特异性CTL,能有效抑制HepG2.2.15细胞HBV的复制。

替芬泰对HepG2-2.2.15细胞HBV-DNA的抑制作用

目的探讨替芬泰对Hep G2-2.2.15细胞HBV-DNA的抑制作用。方法以Hep G2-2.2.15细胞作为实验模型,通过MTT法检测替芬泰对Hep G2-2.2.15细胞的毒性,确定替芬泰对Hep G2-2.2.15细胞的半数中毒浓度(TC50)。在替芬泰浓度为50μg·ml-1时未见明显的细胞毒性,所以设替芬泰3个剂量组为50、25、12.5μg·ml-1,拉米夫定50μg·ml-1作为阳性对照药,收集给药3、6 d的细胞。用实时荧光定量PCR法检测DNA载量。结果替芬泰对Hep G2-2.2.15细胞的TC50为180.70μg·ml-1。随着替芬泰药物浓度的增加,Hep G2-2.2.15细胞内的HBV-DNA拷贝数相应减少,并有明显的浓度依赖性。结论替芬泰对Hep G2-2.2.15细胞内HBV-DNA有显著的抑制作用,有效浓度为12.5μg·ml-1,最佳浓度为50μg·ml-1。