重组腺病毒载体负载树突状细胞诱导乙肝病毒特异性细胞毒性T淋巴细胞
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中华细胞与干细胞杂志(电子版) 2012年11月第2卷第4期 Chin J Cell Stem Cell (Electronic Edition), Nov 2012,Vol.2, No.4261重组腺病毒载体负载树突状细胞诱导乙肝病毒特异性细胞毒性T淋巴细胞
陶然 李进 张克 马世武 姜维 李溢柔 周向军
•实验研究•
DOI:10.3877/cma.j.issn.2095-1221.2012.04.006作者单位:518057 深圳市源兴生物医药科技有限公司(陶然、李进、姜维、李溢柔、周向军);广东省南方医科大学附属南方医院感染内科(张克、马世武)通讯作者:周向军,Email:joe@beike.cc
【摘要】 目的 本研究利用重组腺病毒载体将乙肝病毒基因导入树突状细胞(DC)内表达成内源性蛋白,探索DC体外抗原负载并诱导乙肝病毒(HBV)特异性细胞毒性T淋巴细胞(CTL)的有效方法。方法 分离外周血单个核细胞(PBMC)并诱导成DC。用HFP3肽辅助腺病毒载体进行抗原负载,检测DC细胞内乙肝核心抗原基因的表达,比较
成熟前后DC的表面分子,研究DC诱导的乙肝病毒核心抗原(HBcAg)特异性CTL的增殖。应用统计软件SPSS17.0进行统计分析,以P <0.05为差异有统计学意义。结果 重组腺病毒CHB3感染的DC能有效表达HBcAg蛋白。HFP3辅助感染能显著提高感染效率达3 ~ 10倍。腺病毒载体负载的DC表面CD80、CD86、CCR7的表达有所上调,但差异无统计学意义(平均荧光强度CHB3/iDC:CD80,46.2 ± 14.6 / 29.9 ± 7.9,P = 0.209;CD86,142.0 ± 12.9 / 113.3 ± 6.5,P = 0.430;CCR7,49.3 ± 3.0 / 36.4 ± 4.6,P = 0.054)。Cocktail促成熟
后,CD80、CD83、CD86、CCR7显著上调(平均荧光强度Cocktail-CHB3/iDC:CD80,97.1 ± 8.1 / 29.9 ± 7.9,P = 0.0019;CD83,75.4 ± 8.4 / 26.8 ± 1.5,P = 0.017;CD86,176.2 ± 14.8 /
113.3 ± 6.5,P = 0.021;CCR7,75.3 ± 3.4 / 36.4 ± 4.6,P = 0.0016),HLA-DR分子维持高表达。
CHB3负载的DC与自体T细胞共培养,可检测到HBcAg特异性CTL比例明显增高(1例
由0.25﹪增至1.98﹪,另1例由0.19﹪增至1.37﹪)。结论 在优化的条件下,重组腺病毒载体CHB3能够有效地介导抗原蛋白HBcAg在DC内高水平表达,加入HFP3辅助感染能在较低的感染剂量下获得较高的感染效率,有利于维持DC的活性。重组腺病毒载体CHB3结合HFP3的抗原负载方案能有效地诱导HBcAg特异性CTL。
【关键词】 树突细胞; 腺病毒; 肝炎核心抗原,乙型; T淋巴细胞,细胞毒性
Efficient induction of hepatitis B virus specific CTL through adenovirus infected human dendritic cells TAO Ran*, LI Jin, ZHANG Ke, MA Shi-wu, JIANG Wei, LI Yi-rou, ZHOU Xiang-
jun. *Tsinghua Yuanxing Bio-Pharm Science & Technology Co. Ltd, Shenzhen 518057, China
Corresponding author:ZHOU Xiang-jun, Email:joe@beike.cc【Abstract】 Objective This study investigated transduction and expression of HBV gene in dendritic cells by recombinant adenovirus vectors to establish a reliable methodology for the DC-antigen load in vitro and induction of HBV-specific CTL. Methods To address this issue, we optimized conditions for adenovirus infection using recombinant adenoviral vector rAd-GFP or CHB3 (rAd expressed HBcAg) and a small peptide (HFP3). We also assessed the efficiency of infection of DCs as well as the effect on cell surface marker expression and DC functions. The data in the study was analysed by statistical software SPSS17.0. The statistical significance was determined by Student’s t-test;P < 0.05 was considered statistically significant. Results Our results demonstrated that HFP3 significantly enhanced in vitro transduction of rAds into 中华细胞与干细胞杂志(电子版) 2012年11月第2卷第4期 Chin J Cell Stem Cell (Electronic Edition), Nov 2012,Vol.2, No.4262DCs. Enhancement of rAds infection efficiency by HFP3 is 3-10 times higher than the no-HFP3 control group. The up-regulation of CD80, CD86, CCR7 on the surface of CHB3/HFP3-loaded DCs was not significantly different (P = 0.209, P = 0.430, P = 0.054). But after these DCs were stimulated by a cocktail of cytokines, the expression of CD80, CD83, CD86, and CCR7 were significant increased (P < 0.05) and the expression of HLA-DR maintained at high level. More importantly, the percentage of HBcAg-specific CTL was obviously up-regulated after T cells were cocultured with CHB3/HFP3-loaded DCs. Conclusions Therefore, our study provides evidence that HFP3 might serve as promising strategy for rAd-mediated antigen loading of DCs. DCs transferred by the CHB3 and HFP3 could efficiently activate HBcAg-specific cytotoxic T cells.【Key words】 Dendritic cell; Adenovirus; Hepatitis B core antige; T
lymphocyte, Cytotoxic
特异性细胞免疫反应是机体清除感染病毒和变异细胞的主要机制,体内特异性细胞免疫反应的启动需要抗原递呈细胞(antigen presenting cells,APC),主要包括树突状细胞(dendritic cells,DC)对抗原的递呈[1-2]。慢性乙肝患者体内针对乙肝病毒(hepatitis B virus,HBV)的特异性免疫应答低下,DC功能障碍(如捕获抗原能力下降或成熟受阻等)被认为是主要原因之一[3-5]。本研究探索了用携带有HBV核心抗原(hepatitis B core antigen,HBcAg)基因的重组腺病毒CHB3体外感染DC进行抗原负载的方法和效果,为慢性乙肝患者体内免疫反应低下提供解决方案。材料和方法一、实验材料1.研究标本:健康志愿者,知情告知并签署知情同意书,肝素钠抗凝管抽取外周静脉血50 ml。2.主要试剂:淋巴细胞分离液(美国Hyclone公司);GM-CSF、IL-4、Cocktail、IL-2(美国PeproTech公司);1640培养液,AIM-V培养液(美国Invitrogen公司);PAA淋巴细胞培养液(德国PAA公司);CD86- FITC、CD83- PE、CD80- PEcy5、HLA-DR-FITC、CD14-APC、CCR7-PE、FITC羊抗鼠荧光二抗(美国BD公司);HBcAg-pentamer-PE检测试剂(美国Proimmune公司)。二、实验方法1.外周血单个核细胞(peripheral blood mononuclear cells,PBMC)的分离及DC的体外培养:700 × g离心20 min分离血浆,剩余血应用磷酸盐缓冲液(phosphate buffer saline,PBS)1:3稀释后,淋巴细胞分离液分离PBMC,细胞
计数,用RPMI1640基培重悬细胞,调整细胞密度为5 × 106个/ml,接种于24孔板中,每孔接种1 ml,然后置于37℃、5﹪CO2培养箱内静置培
养,1.5 h后,在超净工作台内,吸除未贴壁细胞,并应用无菌杜氏磷酸缓冲液(dulbecco's phosphate buffered saline,DPBS)液洗涤细胞3次,最后加
入rhGM-CSF( 800 U/ml)、rhIL-4( 400 U/ml)、青霉素100 U/ml、链霉素100 U/ml,并分别用2﹪自体血浆(autologous plasma,AP)的RPMI1640完全培养基(或AIM-V)0.5 ml,37℃、5﹪CO2培养箱内培养。10 h后,吸除上清,并用RPMI1640基培洗涤细胞3次,最后应用上述加入细胞因子、抗生素和含有 2﹪AP的RPMI1640完全培养基(或AIM-V)1 ml,37℃、5﹪CO2培养箱内培养。体