EXPRESSION AND SUBCELLULAR LOCALIZATION OF DNA-PK IN NASOPHARYNGEAL CARCINOMA CELL LINES CNE1 AND CNE2 WITH DIFFERENT RADIOSENSITIVITY

Exploring mechanism of radioresistance and searching for some suitable radiosensitized approaches isone of the ways to improve the curative rate of nasopharyngeal carcinoma. As we know, radiosensitivity is highly correlated with the number of DNA double strand breaks (DSBs) and the extent of it’s repair[1], and the ability of DSBs repair is one of the important factors influencing radiosensitivity. In mammalian cells, the nonhomologous end joining (NHEJ) is the predominan pathway of DSB…     

免疫酶法检测血清EB病毒—IgA／VCA对鼻咽癌诊断的价值

应用免疫酶法对放疗前鼻咽癌病人９９０例、放疗后临床缓解鼻咽癌病人１１６８例、放疗后复发的鼻咽癌病人７６例、头颈部其它恶性肿瘤病人９６例、鼻咽部非癌疾病２１９２例和正常人２３２１名血清的ＥＢ病毒ＩｇＡ／ＶＣＡ抗体进行了检测，阳性率分别为９５．９５％、７７．３９％、９８．６８％、３２．２９％、１２．５４％和０．１７％。结果提示免疫酶法检测ＩｇＡ／ＶＣＡ抗体对鼻咽癌诊断及监测病情有重要的临床价值。     

Epstein—Barr病毒潜伏膜蛋白1的研究进展

ＥｐｓｔｅｉｎＢａｒｒ病毒(ＥＢ病毒)是1种全球性分布、人群感染率较高的人致瘤性疱疹病毒。大量的血清学、流行病学及分子生物学等方面的研究,发现ＥＢ病毒的感染与Ｂｕｒｋｉｔｔ淋巴瘤、鼻咽癌、传染性单核细胞增多症以及霍奇金病等密切相关,其中ＥＢ病毒与鼻咽癌的关系尤     

联合检测EBNA1-IgA和EA-IgG在鼻咽癌血清学诊断中的价值

目的　探讨联合检测EBNA1 IgA和EA IgG在鼻咽癌血清学诊断中的价值。方法　收集 5 6例未经治疗的鼻咽癌患者和 5 8例健康成年人血清 ,用酶联免疫吸附法 (ELISA)检测EBNA1 IgA和EA IgG ,比较其单独或联合检测的灵敏度、特异度、阳性预测值、正确率和优势比。结果　EBNA1 IgA的灵敏度 (91.0 7% )高于EA IgG(87.5 0 % ) ,EA IgG的特异度 (87.93% )高于EBNA1 IgA (84 .4 8% )。二者联合检测的特异度为 94 .83% ,阳性预测值为 0 .9375 ,阳性似然比为 15 .5 4 35 ,优势比为 75 .0 0 0 0。4 5例EBNA1 IgA阳性的鼻咽癌患者与EA IgG阳性结果相吻合 ;5例EBNA1 IgA阴性的鼻咽癌患者中 ,有 4例EA IgG阳性 ;7例EA IgG阴性的鼻咽癌患者中 ,有 6例EBNA1 IgA阳性。结论　EBNA1 IgA和EA IgG在血清学检测中有较高的灵敏度和特异度 ,二者联合检测有互补作用 ,可提高鼻咽癌血清学诊断的可靠性。大多数鼻咽癌患者为EBNA1 IgA和EA IgG双阳性     

广西五地区25万自然人群EB病毒VCA-IgA联合EBNA1-IgA鼻咽癌筛查结果分析

目的 对广西五地南宁市青秀区、崇左市江州区、桂平市、宾阳县以及田东县30～59岁自然人群共248 437人进行鼻咽癌血清学筛查,并对危险人群进行鼻咽活检以期促进广西鼻咽癌的早诊早治.方法 以上5地各级卫生部门对所在片区30～59岁自然人群进行登记造册,ELISA法检测筛查自然人群血清中EBNA1-IgA和VCA-IgA...     

六种抗EB病毒抗体检测在鼻咽癌血清学诊断中的比较

目的:评估EBNA1-IgA,EBNA1-IgG,Zta-IgA,Zta-IgG,VCA-p18-IgA和VCA-p18-IgG六种酶联免疫吸附检测(ELISA)在血清学诊断鼻咽癌中的应用,探讨哪种ELISA组合更有功效.方法:收集85例治疗前鼻咽癌患者和132例健康成人血清.应用六种EB病毒特异性重组融合蛋白ELISA,检测血清抗EB病毒的抗体水平.采用灵敏度、特异度、优势比等参数来评估它们在诊断鼻咽癌中的效率.结果:单独采用一种检测时,Zta-IgG和EBNA1-IgA的灵敏度与特异度均可达0.8106以上.Zta-IgG/EBNA1-IgG和Zta-IgG/EBNA1-IgA两种检测双阳性的特异度提高至0.9621以上.Zta-IgG/EBNA1-IgA/EBNA1-IgG或Zta-IgG/EBNA1-IgG/Zta-IgA三种检测均阳性者,其特异度不仅可达0.9824,优势比也明显升高(分别为206.4242和196.5000).85例患者血清中无1例同时呈Zta-IgG/EBNA1-IgA/EBNA1-IgG阴性者.结论:临床血清学诊断鼻咽癌,首选Zta-IgG或EBNA1-IgA.同时检测两种ELISA,宜采用Zta-IgG/EBNA1-IgA或Zta-IgG/EBNA1-IgG.三种ELISA同时检测,可以提高特异度.推荐Zta-IgG/EBNA1-IgA/EBNA1-IgG或Zta-IgG/EBNA1-IgG/Zta-IgA三项.     

Systematic review on Epstein-Barr virus (EBV) DNA in diagnosis of nasopharyngeal carcinoma in Asian populations

Objective: To conduct a meta-analysis to investigate the value of EBV DNA in diagnosis of nasopharyngealcancer (NPC) in Asian populations, and provide important evidence for screening. Methods: Prospective orrespective case-control or cohort studies regarding the detection role of EBV DNA for NPC were included inour study. We conducted a comprehensive literature search in PubMed, EMBASE, and the Chinese BiomedicalDatabase (CBM database between January 1980 and March 2012. Results: A total of 18 studies with 1492 NPCcases and 2641 health controls were included. Almost of the included studies were conducted in China, andonly one other conducted in Thailand. The overall results demonstrated that the pooled sensitivity, specificity,positive likelihood (+LR) and negative likelihood (-LR) were 0.73 (0.71-0.75), 0.89 (0.88-0.90), 8.84 (5.65-13.84)and 0.19(0.11-0.32), respectively. The overall EBV DNA detection showed the largest area of 0.932 under thesummary receiver operator curve (SROC). The accuracy of detection by plasma for NPC (0.86) was higherthan in serum (0.81), with largest areas under the SROC of 0.97 and 0.91, respectively. Conclusion: Our resultsdemonstrated the EBV DNA detection in plasma or serum has high sensitivity and specificity in diagnosis ofNPC, especially in Chinese populations with a high risk of cancer.     

血浆EB病毒DNA检测在鼻咽癌中的应用进展

EB病毒(Epstein-Barr virus,EBV)与鼻咽癌的发生、发展密切相关,采用PCR方法对鼻咽癌患者不同阶段的血浆EB病毒DNA (EBV DNA)进行定量检测可有效评估患者对治疗的反应,预测复发、转移的风险,治疗前的EBV DNA基线浓度与肿瘤负荷密切相关,而治疗后的EBV DNA含量与肿瘤复发转移关系更密切.EBV DNA定量检测有望成为一种新的肿瘤预后指标.本文就鼻咽癌患者不同时期的EBV DNA水平在诊断、分期、疗效评估和预后预测中的应用进行综述.     

MicroRNAs in nasopharyngeal carcinoma

MicroRNAs（miRNAs） provide insight into both the biology and clinical behavior of many human cancers, including nasopharyngeal carcinoma（NPC）. The dysregulation of miRNAs in NPC results in a variety of tumor-promoting effects. Furthermore, several miRNAs are prognostic markers for NPC. In addition to cellular miRNAs, NPC samples also often contain miRNAs encoded by Epstein-Barr virus, and these miRNAs may impact NPC biology by targeting both cellular and viral genes. Given their numerous putative roles in NPC development and progression, a thorough understanding of the impact of miRNA dysregulation in NPC is expected to shed light on useful biomarkers and therapeutic targets for the clinical management of this disease. In this review, we describe the efforts to date to identify and characterize such miRNAs in the context of NPC.     

Effects of eb virus encoded LMP1 on differentiation of nasopharyngeal carcinoma cells

Latent membrane protein 1 (LMP1) is encoded by the BNLF1 fragment of Epstein-Barr virus (EBV) and recognized as an important oncoprotein nowadays. It is popularly known that EBV infection is closely associated with the development of nasopharyngeal carcinoma (NPC), and LMP1 would play its crucial role in nasopharyngeal carcino- genesis. LMP1 has a variety of carcinogenic functions. LMP1 can immortalize and malignantly transform normal lymphocytes or epithelial cells with the cooperat…     

EBV-LMP1对鼻咽癌细胞系CNE1细胞凋亡的影响

背景与目的:已证实EB病毒编码的潜伏膜蛋白1(latentmembraneprotein,LMP1)具有转化致瘤作用,在鼻咽癌的发生发展中起重要作用。LMP1的转化致瘤作用可能与细胞凋亡有关,本实验目的是观察EBV-LMP1对鼻咽癌细胞系CNE1细胞凋亡的影响,探索LMP1在鼻咽癌发生发展中的可能机制。方法:用电转染的方法将带有绿色荧光蛋白GFP报道系统的EB病毒LMP1基因真核表达质粒导入CNE1,用荧光显微镜检测报道基因GFP的表达情况;用免疫组化法及Westernblot法检测目的基因LMP1的表达情况;用流式细胞仪、荧光染色及DNA片段分析等方法检测在有地塞米松磷酸钠或无血清饥饿诱导的情况下LMP1对CNE1细胞凋亡的影响。结果:CNE1G细胞(转染空载质粒PAT-GFP的CNE1细胞)及CNE1GL(转染目的基因质粒PAT-GFP-LMP1的CNE1细胞)有绿色荧光蛋白表达,CNE1细胞(未经转染的CNE1细胞)无绿色荧光蛋白表达;CNE1GL细胞LMP1呈阳性表达,而CNE1及CNE1G细胞均为阴性。CNE1、CNE1G及CNE1GL3组细胞分别用地塞米松磷酸钠或无血清1640培养液处理后均有凋亡出现,且两种诱导方法均能使CNE1GL组细胞的凋亡指数(apoptosisindex,AI)较CNE1及CNE1G组明显增高(P<0.05),而CNE1与CNE1G组的凋亡指数无明显差别。3组细胞常规培养下则无凋亡出现。结论:LMP1基因成功导入CNE1细胞     

中山市鼻咽癌高发现场13年前瞻性研究

目的本课题为评估EB病毒血清学筛查鼻咽癌的前瞻性研究,并比较EB病毒血清学VCA/IgA阳性、阴性人群鼻咽癌的发病危险.方法对中山市30～59岁的42048人进行血清EB病毒VCA/IgA、EA/IgA检测等.所有人群随访至1999年底.结果筛查13年阳性人群各年发病率始终高于阴性人群,平均发病率约为阴性人群的20倍.筛查组、阳性随访组早期(Ⅰ、Ⅱ)诊断率分别为87.88%、83.33%,显著高于医院门诊病人的54.41%(x2=28.62、X2=9.92,P＜0.01).阴性组早诊率为49.12%,与门诊组差异无显著意义(x2=0.62,P＞0.05).结论VCA/IgA阳性人群在较长时期维持较高的患病危险,是筛查的重点;筛查的各种宣传手段可以有效地提高人群防癌意识;如以前报道,检测血清EB病毒抗体可以检出早期鼻咽癌.     

鼻咽癌中EBV感染与某些基因产物表达的关系

目的　观察EB病毒RNA(Epstin Barrvirus ,EBV)、膜蛋白 (LMP 1)、c erbB 2、CyclinD1,bcl 2和p5 3蛋白在鼻咽癌组织中的表达 ,探讨其相互间关系及其在鼻咽癌发生发展中的作用。方法　采用原位分子杂交技术检测了 36例鼻咽癌组织中EBV编码的encodedsmallRNAs(EBERs)、用免疫组化技术检测LMP 1、CyclinD1、c erbB 2、bcl 2和 p5 3蛋白的表达。 结果　36例鼻咽癌组织中全部检出EBVRNAs ,阳性率为 10 0 % (36 /36 ) ,LMP14 4 .4 % (16 /36 ) ,CyclinD15 2 .8% (19/36 ) ,c erB 25 8.3% (2 1/36 ) ,bcl 2 4 4 .4 % (16 /36 ) ,p5 333.3% (12 /36 )。鼻咽癌组织中EB病毒感染与c erB 2、CyclinD1癌基因的表达、p5 3抑癌基因的失活之间有明显的关系。结论　鼻咽癌与EB病毒作为致瘤病毒激活癌基因蛋白的表达密切相关。鼻咽活检组织中有EBERs及LMP 1的检出 ,对确定鼻咽癌的诊断具有一定的价值。