ObjectiveTo study the effects of dendritic cells (DC) transfected with recombinant vaccinia virus encoding Epstein Barr virus (EBV) latent membrane protein 2A(LMP2A) gene,and to provide evidence for further investiga...ObjectiveTo study the effects of dendritic cells (DC) transfected with recombinant vaccinia virus encoding Epstein Barr virus (EBV) latent membrane protein 2A(LMP2A) gene,and to provide evidence for further investigation on the therapeutic vaccines against EBV associated malignancies. MethodsMature DC were transfected with EBV LMP2A recombinant vaccinia virus (rVV LMP2A). Before and after the transfection,the expression of surface antigens on mature DC including CD1a,CD83,CD40,CD80,HLA DR was measured by fluorescence activated cell sorter (FACS) and the function of DC to stimulate allogeneic T cells proliferation was measured by mixed leukocyte reactions (MLR). ResultsLMP2A protein was highly expressed (66.1 %) in DC after the transfection of rVV LMP2A. No significant changes in the primary surface antigens expression and in the MLR were detected during the transfection. Transfected DC still had strong potential in stimulating the proliferation of allogeneic T cells. ConclusionRecombinant vaccinia virus was an effective and non perturbing vector to mediate the transfection of LMP2A into DC. The functions of mature DC were not affected significantly by the transfection of Vac LMP2A. This study could provide evidence for the further immunotherapy of EBV associated malignancies,e.g. nasopharyngeal carcinoma (NPC).展开更多
目的:研究成脂诱导剂MDI对活化的人肝星状细胞的作用及其机制。方法:体外培养人肝星状细胞系LX-2细胞,实验分为4组,即空白对照组、溶剂对照组、重组人转化生长因子β1(TGF-β1)组、TGF-β1+MDI组。油红O染色法检测细胞内脂滴变化,实时...目的:研究成脂诱导剂MDI对活化的人肝星状细胞的作用及其机制。方法:体外培养人肝星状细胞系LX-2细胞,实验分为4组,即空白对照组、溶剂对照组、重组人转化生长因子β1(TGF-β1)组、TGF-β1+MDI组。油红O染色法检测细胞内脂滴变化,实时荧光定量PCR(RT-qPCR)法检测肝纤维化标志物肌动蛋白α2(ACTA2)、Ⅰ型胶原蛋白α1(COL1A1)、金属蛋白酶组织抑制剂1(TIMP1)基因相对表达量。线粒体特异性荧光探针检测TGF-β1/MDI干预后LX-2细胞内线粒体数量的变化。采用western blotting法检测各组蛋白磷酸酶2A催化性C亚基(PP2Ac)蛋白表达。结果:与空白对照组和溶剂对照组比较,TGF-β1组LX-2细胞胞体增大、呈多边形且胞质增多、未见明显脂滴、线粒体数量增加,肝纤维化标志物ACTA2、COL1A1和TIMP-1mRNA表达水平以及PP2Ac去甲基化蛋白表达水平升高(均P<0.01)。与TGF-β1组比较,TGF-β1+MDI组细胞变小、胞质内小脂滴数量增加、线粒体数量减少,ACTA2、COL1A1和TIMP-1 m RNA表达水平以及PP2Ac去甲基化蛋白表达水平降低(均P<0.05)。结论:TGF-β1和MDI可能通过调控肝星状细胞的PP2Ac去甲基化水平调控人肝星状细胞活化,且与脂质生成以及线粒体数量有关。展开更多
蛋白磷酸酶2A的癌性抑制因子(cancerous inhibitor of protein phosphatase 2A,CIP2A)是2007年发现的一种癌蛋白,它能够抑制蛋白磷酸酶2A(protein phosphatase 2A,PP2A)对c-Myc蛋白降解,稳定c-Myc蛋白的过表达水平,进而导致细胞恶性转...蛋白磷酸酶2A的癌性抑制因子(cancerous inhibitor of protein phosphatase 2A,CIP2A)是2007年发现的一种癌蛋白,它能够抑制蛋白磷酸酶2A(protein phosphatase 2A,PP2A)对c-Myc蛋白降解,稳定c-Myc蛋白的过表达水平,进而导致细胞恶性转化和肿瘤形成。文中就CIP2A在恶性肿瘤中的表达及其相关分子生物学机制的研究进展作一综述。展开更多
文摘目的 探究蛋白磷酸酶2A癌性抑制因子(CIP2A)和CD44v6在尖锐湿疣(CA)患者皮损组织中的表达,分析二者与CA患者HPV基因型分布及其预后的相关性。方法 选取本院2020年4月至2023年4月收治的CA患者100例作为研究组,根据预后情况将患者分为预后良好组和不良组,收集术中保留的皮损组织;另选取本院同期行外阴整形或包皮环切术者100例作为对照组,收集切下的外阴组织或正常包皮组织。实时荧光定量PCR法检测组织标本中的CIP2A、CD44v6 mRNA表达水平。比较研究组与对照组、不同HPV分型组、预后良好组与预后不良组中CIP2A、CD44v6 mRNA的表达水平,分析CA组织中CIP2A、CD44v6的表达与临床特征的关系,采用多因素COX回归分析CA患者预后的影响因素;绘制ROC曲线分析CIP2A、CD44v6对CA患者预后不良的预测价值。结果 研究组CIP2A、CD44v6 mRNA的表达水平显著高于对照组(CIP2A:2.19±0.40 vs 1.01±0.24,t=25.24,P<0.05;CD44v6:1.75±0.33 vs 1.02±0.22,t=18.41,P<0.05)。低危组、高危组和混合组CIP2A、CD44v6 mRNA表达水平均依次升高(均P<0.05)。预后不良组CIP2A、CD44v6 mRNA表达水平显著高于预后良好组(CIP2A:3.58±0.62 vs 1.62±0.31,t=21.05,P<0.05;CD44v6:2.57±0.49 vs 1.42±0.26,t=15.26,P<0.05)。CIP2A、CD44v6的表达与疣体数目和直径有关(均P<0.05)。多因素COX回归分析结果显示,CIP2A、CD44v6的表达以及疣体数目、直径是影响CA患者预后的危险因素(P<0.05)。ROC曲线显示,CIP2A预测CA患者预后不良的AUC为0.866,CD44v6的AUC为0.860,二者联合的AUC为0.928,二者联合优于各自单独预测(Z_(联合vs CIP2A)=2.72、Z_(联合vs CD44v6)=2.73,P均<0.05)。结论 CA患者组织中CIP2A、CD44v6的表达水平显著升高,二者均与HPV基因型分布及其预后有关。CIP2A和CD44v6联合可提高对CA患者预后预测的准确性。
基金This paper is supported by grant from the National Natural Science Foundation of China(No.30 1 70 880 )
文摘ObjectiveTo study the effects of dendritic cells (DC) transfected with recombinant vaccinia virus encoding Epstein Barr virus (EBV) latent membrane protein 2A(LMP2A) gene,and to provide evidence for further investigation on the therapeutic vaccines against EBV associated malignancies. MethodsMature DC were transfected with EBV LMP2A recombinant vaccinia virus (rVV LMP2A). Before and after the transfection,the expression of surface antigens on mature DC including CD1a,CD83,CD40,CD80,HLA DR was measured by fluorescence activated cell sorter (FACS) and the function of DC to stimulate allogeneic T cells proliferation was measured by mixed leukocyte reactions (MLR). ResultsLMP2A protein was highly expressed (66.1 %) in DC after the transfection of rVV LMP2A. No significant changes in the primary surface antigens expression and in the MLR were detected during the transfection. Transfected DC still had strong potential in stimulating the proliferation of allogeneic T cells. ConclusionRecombinant vaccinia virus was an effective and non perturbing vector to mediate the transfection of LMP2A into DC. The functions of mature DC were not affected significantly by the transfection of Vac LMP2A. This study could provide evidence for the further immunotherapy of EBV associated malignancies,e.g. nasopharyngeal carcinoma (NPC).
文摘目的:研究成脂诱导剂MDI对活化的人肝星状细胞的作用及其机制。方法:体外培养人肝星状细胞系LX-2细胞,实验分为4组,即空白对照组、溶剂对照组、重组人转化生长因子β1(TGF-β1)组、TGF-β1+MDI组。油红O染色法检测细胞内脂滴变化,实时荧光定量PCR(RT-qPCR)法检测肝纤维化标志物肌动蛋白α2(ACTA2)、Ⅰ型胶原蛋白α1(COL1A1)、金属蛋白酶组织抑制剂1(TIMP1)基因相对表达量。线粒体特异性荧光探针检测TGF-β1/MDI干预后LX-2细胞内线粒体数量的变化。采用western blotting法检测各组蛋白磷酸酶2A催化性C亚基(PP2Ac)蛋白表达。结果:与空白对照组和溶剂对照组比较,TGF-β1组LX-2细胞胞体增大、呈多边形且胞质增多、未见明显脂滴、线粒体数量增加,肝纤维化标志物ACTA2、COL1A1和TIMP-1mRNA表达水平以及PP2Ac去甲基化蛋白表达水平升高(均P<0.01)。与TGF-β1组比较,TGF-β1+MDI组细胞变小、胞质内小脂滴数量增加、线粒体数量减少,ACTA2、COL1A1和TIMP-1 m RNA表达水平以及PP2Ac去甲基化蛋白表达水平降低(均P<0.05)。结论:TGF-β1和MDI可能通过调控肝星状细胞的PP2Ac去甲基化水平调控人肝星状细胞活化,且与脂质生成以及线粒体数量有关。
文摘蛋白磷酸酶2A的癌性抑制因子(cancerous inhibitor of protein phosphatase 2A,CIP2A)是2007年发现的一种癌蛋白,它能够抑制蛋白磷酸酶2A(protein phosphatase 2A,PP2A)对c-Myc蛋白降解,稳定c-Myc蛋白的过表达水平,进而导致细胞恶性转化和肿瘤形成。文中就CIP2A在恶性肿瘤中的表达及其相关分子生物学机制的研究进展作一综述。
