E6-AP三种转录本在宫颈癌的表达及临床意义

目的:探讨E6-AP3种转录本在宫颈癌的表达及其临床意义。方法:免疫组织化学SP法检测30例宫颈癌组织及20例正常宫颈组织中E6-AP蛋白的表达,分析E6-AP的表达与宫颈癌病理分级之间的关系。同时用W estern blot检测E6-AP在正常宫颈脱落细胞和宫颈癌脱落细胞的表达水平。RT-PCR方法明确E6-AP 3种转录本在正常宫颈组织和宫颈癌组织中的表达。结果:RT-PCR结果显示E6-AP3种亚型在宫颈癌组织中均存在,并且表达高于正常子宫颈组织,其中Ⅱ型表达水平很低,以Ⅰ型和Ⅲ型为主。免疫组化和W estern B lot结果显示E6-AP在宫颈癌组织表达水平高于正常宫颈组织。结论:E6-AP表达升高可能与宫颈癌的发病机制相关。     

HPVE6/E7致病机制及在宫颈癌中研究进展

【摘要】人乳头瘤病毒（Human Papillomavirus,HPV）感染是宫颈癌的主要危险因素,癌基因HPVE6/E7的表达对于恶性肿瘤的转归和维持起着重要作用。近年发现Wnt/β-catenin信号转导通路、钙粘蛋白、CD4+CD8+T细胞、STK31等均参与HPV E6/E7致病。利用SiRNA、4-1BB等技术为宫颈癌防治提供了新的视角。本文就HPV E6/E7的生物学特性、致病机制及在宫颈癌中所起的作用、可能的发展方向作一综述。     

HPV16 E6小干扰RNA与宫颈癌细胞中E6 p53 p21关系的研究

目的 探讨HPV16E6小干扰RNA（siRNA）与宫颈癌CaSki细胞中E6、p53、p21之间的关系。方法 2004年9月至2005年3月于四川大学华西第二医院,应用化学合成针对HPV16E6的siRNA借脂质体转染CaSki细胞,实时荧光定量逆转录-聚合酶链反应（RT-PCR）和流式细胞术检测E6siRNA转染前后细胞中HPV16E6、p53、p21mRNA及其蛋白表达的变化。结果 转染24h,E6mRNA的表达显著低于空白组（P〈0.05）。各时间点p53、p21mRNA的表达差异无显著性意义（P〉0.05）。转染48h,E6蛋白表达明显下调,p53、p21蛋白表达相应升高。结论 HPV16E6siRNA能特异、高效地沉默宫颈癌细胞E6mRNA的表达,减少对野生型p53的降解,恢复p53蛋白的功能活性。RNA干扰（RNAi）技术可为HPV感染相关性疾病提供一种新的特异性基因治疗方法。     

宫颈癌及癌前病变组织中Notch1及HPV16 E6/E7表达的研究

目的 探讨Notch1受体和人乳头瘤病毒16感染在宫颈癌前病变和宫颈癌发生发展中的作用。方法 采用免疫组化SP法检测18例宫颈上皮内瘤变（cervical intraepithelial neoplasia,CIN）和35例宫颈癌标本中Notch1受体及HPV16E6/E7蛋白的表达,以34例正常宫颈组织及慢性宫颈炎组织作为对照。比较各组间Notch1及HPV16E6/E7表达的差异,并分析Notch1与HPV16E6/E7表达的关系。结果 Notch1蛋白在细胞胞浆、胞核及胞膜中表达,HPV16E6/E7在细胞核中表达。从对照组到CIN组到宫颈癌组,Notch1及HPV16E6/E7的表达均逐渐增强（P〈0.01）。Notch1的阳性表达与宫颈癌不同分期、分化程度、淋巴结是否转移无关（P〉0.05）。在宫颈癌组中Notch1与HPV16E6/E7的表达均呈正相关性（P〈0.01）。结论 Notch1表达与HPV16E6/E7感染可能与CIN及宫颈癌的发生密切相关,两者在宫颈癌的发病机制中可能协同发挥作用。     

高危型HPV16 E6蛋白表达抑制宫颈癌细胞株p63α表达的研究

目的:探讨高危型HPV16 E6蛋白的表达对宫颈癌细胞株中p63α表达的影响。方法:用RT-PCR法从SiHa中扩增出带酶切位点的HPV16 E6的片段,将HPV16 E6基因片段克隆到p3×flag-CMV-Myc-24真核表达载体上,通过脂质体转染入宫颈癌细胞株后,W estern blot检测p63α的表达。结果:成功构建HPV16 E6真核表达载体,转染至宫颈癌SiHa和Caski细胞株中,p63α均低于对照组。结论:高危型HPV E6能够抑制p63α的表达,提示p63α与HPV E6的相互作用在子宫颈癌发病中发挥重要作用。     

人乳头状瘤病毒E6、E7原癌蛋白致癌的机制

高危型人乳头状瘤病毒E6、E7基因编码的原癌蛋白是导致宫颈癌的重要原因,其致癌机制主要与p53,pRb有关,还与端粒酶激活、干扰素调控因子3、E6靶蛋白1、p21、组蛋白脱乙酰脂酶以及凋亡有关。     

β-D-葡聚糖通过下调HPV16 E6和重新激活p53调节HPV16阳性宫颈癌细胞的生物学行为

目的:研究β-D-葡聚糖在宫颈癌细胞中的作用及可能机制。方法:CCK-8法检测β-D-葡聚糖对宫颈癌细胞CaSki、HeLa和SiHa细胞增殖的影响,伤口愈合试验检测细胞迁移情况,流式细胞术检测细胞周期和细胞凋亡情况。采用实时荧光定量聚合酶链式反应(qRT-PCR)检测细胞中HPV16 E6/E7、HPV18 E6/E7、p53和p21 mRNA表达水平,Western blot检测N-钙黏蛋白、E-钙黏蛋白、p53、波形蛋白、p21蛋白表达水平。以宫颈癌CaSki细胞为研究对象,在雌性BALB/c小鼠皮下注射成瘤,验证β-D-葡聚糖在体内对肿瘤生长的抑制作用。结果:β-D-葡聚糖对不同宫颈癌细胞增殖的影响不同,对CaSki细胞增殖有显著的时间依赖性抑制作用,对HeLa细胞增殖无显著影响,对SiHa细胞作用72h后表现为促进增殖作用(P<0.05)。β-D-葡聚糖对CaSki、HeLa和SiHa细胞的迁移都有抑制作用(P<0.05)。β-D-葡聚糖对CaSki、SiHa的细胞周期有调节作用并能促进其凋亡(P<0.05),但对HeLa细胞无显著影响。与对照组相比,β-D...     

HPV E6E7、宫颈液基细胞学、阴道镜活检在宫颈癌的筛查价值研究进展CSCD

宫颈癌常因高危型人乳头状瘤病毒(HPV)持续感染进展而来,患者早期症状常不显著,仅在宫颈癌晚期出现阴道出血等症状,通过接种疫苗和定期筛查是预防宫颈癌最有效的方法。HPV E6E7检测、宫颈液基细胞学检查(TCT)和阴道镜活检是常用的宫颈癌筛查检测手段,本研究总结国内外相关研究,综述了TCT、HPV E6E7检测和阴道镜活检在宫颈癌筛中的应用,以期为推进宫颈癌的防治提供一定的理论基础。     

HPV E6/E7 mRNA检测在宫颈癌筛查中应用价值的Meta分析

目的:评价HPV E6/E7 mRNA检测在宫颈癌筛查中的临床应用价值。方法:检索数据库并筛选英文文献,对纳入文献进行质量评估,提取纳入研究的特征信息。以宫颈组织病理诊断为金标准,研究HPV E6/E7 mRNA检测在宫颈癌筛查中应用价值的相关文献进行Meta分析。结果:共纳入10篇文献,纳入文献稳定性好,研究对象共计44477例。对参与筛查人群诊断级别CINⅡ及以上(CINⅡ~+)的宫颈病变,HPV E6/E7 mRNA检测和HPV DNA二代杂交捕获检测(HC2)的合并敏感度分别为0.89(95%CI 0.85~0.91)及0.92(95%CI 0.90~0.95);合并特异度分别为0.93(95%CI0.93~0.93)及0.90(95%CI 0.90~0.90)。诊断级别CINⅢ及以上(CINⅢ~+)的宫颈病变,两者合并敏感度无明显差异,HPV E6/E7 mRNA检测的合并特异度较高。结论:与HC2检测相比,HPV E6/E7 mRNA检测CINⅢ~+的宫颈病变表现出较高的特异度。HPV E6/E7 mRNA检测可作为宫颈癌病变启动监测指标,可提早发现高级别病变,提早进行临床干预,改善患者临床结局。     

Human papillomavirus type 16 E6 and E7 gene variations in Indian cervical cancer

OBJECTIVES: Human papillomavirus type 16 is a causative factor for development of cervical cancer. The E6 and E7 genes of HPV 16 are critical to the process of immortalization and transformation of host cells. Recent reports suggest that variants of these two genes may contribute to the risk of malignant progression of cancer in the uterine cervix. However, no data exist on sequence variations of HPV 16 E6 and E7 genes that may exist in India. Therefore, we examined intratype variations in the E6 and E7 viral genes in DNA isolated from HPV 16-positive cervical scrapes and biopsies. METHODS: The open reading frames of the E6 and E7 genes were amplified by PCR and then directly sequenced by the fluorescent dye dideoxy termination method.Results. In addition to the prototype E6 gene sequence, five sets of mutations of the E6 gene were identified. The European prototype (350T) was detected in 9.1% of the study group while the European variant (350G) was seen in 28% of patients. The remaining variants (a combination of the 350G mutation with 335T, 145T, or 419G) were significantly associated with cases compared to controls. The 350G + 145T variant was found at much higher incidence in cases in younger women, suggesting that this variant may be associated with aggressive tumor behavior. Interestingly the 350G + 419G combination was found only in controls. There was no significant association between the four genotypes of E7 and any stage of tumor progression or age. CONCLUSIONS: The results indicate that specific mutations in the E6 gene are found in young Indian women with high-grade squamous intraepithelial lesions and invasive cancer, suggesting that these mutations represent more oncogenically active HPV 16. Whether this increased oncogenecity is due to differences in p53 inactivation, ineffective keratinocyte differentiation, and/or altered response to the immune system by these oncogenic E6 mutants remains to be clarified.     

Analysis of p53 codon 72 polymorphism and its association with human papillomavirus 16 and 18 E6 in Chinese cervical lesions

The aim of this study was to analysis the relationship between p53 codon 72 polymorphism with human papillomavirus (HPV) 16 and 18 E6 in Chinese cervical cancer. A total of 81 cervical squamous cancer (specimens of G1, G2, and G3 are 13, 24, and 44, respectively; and of stage IB, IIA, IIB, and IIIA are 15, 37, 24, and 5, respectively), 18 cervical adenocarcinoma, 88 cervical intraepithelial neoplasm (CIN) (specimens of CIN II and III are 30 and 58), and 60 normal cervical specimens were included in this study. Polymerase chain reaction was used to examine p53 genotypes and HPV 16 and 18 E6. The frequencies of p53 Arg homozygosity in cervical squamous cancer, cervical adenocarcinoma, and CIN (II-III) were 58.02%, 55.55%, and 59.09%, respectively, that was much higher than that of p53 Arg/Pro heterozygosity (30.86%, 27.78%, and 21.59%) and of p53 Pro homozygosity (11.12%, 16.67%, and 19.32%) in each groups and higher than the frequency of p53 Arg homozygosity in normal samples (23.33%). There is no statistic difference in the normal samples for the frequency of p53 Arg homozygosity, p53 Arg/Pro heterozygosity, and p53 Pro homozygosity (23.33%, 40.00%, and 36.67%, respectively). The frequency of p53 Arg homozygosity in high risk (HR)-HPV E6-positive cervical squamous cancer samples (64.06%) is much higher than that in (HR)-HPV E6-negative cervical squamous cancer samples (35.29%) and in HR-HPV E6-positive normal samples (33.33%). No difference of p53 codon 72 polymorphism was found according to FIGO staging and grades. In conclusion, based on the findings of this study, it is suggested that p53 Arg homozygosity could act as a potential risk factor for the tumorigenesis of the cervix. p53 codon 72 polymorphism has no relation with the FIGO staging and grades of cervical cancer. p53 Arg homozygosity and HR-HPV E6 positive simultaneously can predict the fate of cervical lesions.     

Immune response to p53 and HPV-16 E6 proteins in patients with cervical cancer

Park JS, Kim CJ, Um SJ, Hwang ES, Kim HS, Park SN, Namkoong SE, Kim SJ. Immune response to p53 and HPV-16 E6 proteins in patients with cervical cancer. Int J Gynecol Cancer 1998; 8 : 328–335.
To investigate whether p53 autoantibodies could be found in the sera of patients with cervical cancers, we have therefore studied by radioimmunoprecipitation assay, using in vitro translated p53 protein, sera from such patients. The sero-positive patients for p53 were also evaluated in relation to immunoreactivity to p53 antigens by immunohistochemistry, for genomic alterations of p53 by PCR-SSCP, and for the presence of HPV-16/18 DNAs in the cervical cancer cells. In immunohistochemistry, expression of p53 protein was seen in 47% (14/30) of HPV-16 or -18 positive cervical cancers and 13 % (2/15) of HPV-16/18 negative cervical cancers ( P < 0.01). Eight out of 12 control ovarian cancers (67%) showed positive p53 staining in most tumor cells. Cases of cervical cancer and ovarian cancer, which were positively expressed p53 protein in the tissue or the sera, were studied for genomic alterations in exons 5–8 of the p53 by PCR-SSCP. Serum antibodies to in vitro translated p53 protein were found in two cases from 63 cervical cancers; one patient was stage IIA, having HPV-16 DNA in a tumor of squamous cell type, and another patient was stage IIIB, having HPV-16 and -18 DNAs in an adenocarcinoma. The cervical cancer tissues from the two sero-positive patients were also positive for p53 immunostaining. None of the cervical cancer samples showed aberrant bands, but three of eight cases of ovarian cancer which were positive for p53 protein by immunostaining were shown to have aberrant bands by PCR-SSCP. In contrast to ovarian cancers, alteration of p53 tumor suppressor gene and positive antibody response to p53 protein seem to be rare events in patients with cervical cancer.     

Aptima法人乳头瘤病毒E6/E7 mRNA检测在子宫颈癌筛查中的流行病学分析及其诊断价值

目的 通过Aptima法检测人乳头瘤病毒(HPV)E6/E7 mRNA,研究其分型和定量检测结果在不同年龄和子宫颈活检中的分布情况,探讨其在子宫颈病变中的诊断价值.方法 选取2019年1月至2020年1月于郑州大学第三附属医院行HPV E6/E7 mRNA检测的患者为研究对象,收集HPVE6/E7 mRNA阳性患者的年...     

Polymorphism p53 codon-72 and invasive cervical cancer: a meta-analysis.

OBJECTIVES: Although some studies have reported that the arginine isoform on codon 72 of p53 increases the susceptibility to invasive cervical cancer, such data remain controversial. The objective of this study was to quantitatively summarize the evidence for such a relationship. METHODS: Our data sources consisted of a MEDLINE search of the literature published before December 2002, bibliography review, and expert consultation. Thirty-seven studies met the inclusion criteria. Information on sample size, study design, Hardy-Weinberg equilibrium, and method of genotype determination was abstracted by two reviewers using a standardized protocol. The overall odds ratio (OR) of the p53 gene on invasive cervical cancer was estimated using the Mantel-Haenzel method. RESULTS: The overall OR (95% confidence interval) for cervical cancer among those with the homozygous mutant (Arg/Arg) was 1.2 (1.1-1.3, P=0.001) compared with those with the heterozygous mutant (Arg/Pro). By a cellular type of cervical cancer, the overall OR among those with Arg/Arg was statistically significant in adenocarcinomas (1.7, 1.1-2.6, P=0.024), but not in squamous cell carcinomas (1.1, 0.9-1.2, P=0.960), compared with Pro/Pro. Compared with Arg/Pro, the OR among those with Arg/Arg was statistically significant in HPV types 16 (1,5, 1.2-2.0, P=0.002). CONCLUSIONS: Overall, the p53 gene was associated with increased risk for invasive cervical cancer. However, the risk varied by country, cellular, and HPV type.