重组腺病毒bcl-xs基因对人卵巢癌裸鼠移植瘤作用的研究

目的 观察重组腺病毒bcl-xs基因（adv-bcl-xs基因,简称bcl-xs基因）对人卵巢癌裸鼠移植瘤的生长抑制和荷瘤裸鼠生存率的影响。为卵巢癌的基因治疗提供实验基础。方法 采用以复制缺陷型腺病毒bcl-xs基础感染的人胚肾细胞,使bcl-xs基因对NUTU-19细胞的生长抑制作用并检测其病毒滴度后,将bxl-xs基因导入人卵巢癌裸鼠移植瘤中,观察bcl-xs基因对腹水的生长抑制作用,计算裸鼠的生存时间,并观察bcl-xs基因对裸鼠全身和局部的毒副作用。电镜观察bcl-xs基因的病毒颗粒,以免疫细胞化学染色测定bcl-xs基因表达情况。结果 bcl-xs基因可在人胚肾细胞内扩增,对NUTU-19细胞有抑制和杀伤作用。并在裸鼠体内呈过度表达,使裸鼠腹水形成的时间由5-10d延长至11-23d,裸鼠平均生存时间由24d延长至39d,bcl-xs基因对裸鼠全身和局部无明显毒副作用。结论 bcl-xs基因导入人卵巢癌裸鼠移植肿瘤,能延缓腹水形成,延长裸鼠的生存时间,为卵巢癌的基因治疗提供了一种新方法。     

微小RNA在肿瘤研究方面的进展

微小RNA(miRNA)通过特异性碱基对互补调节其靶mRNA的基因表达,参与细胞的增殖、分化与凋亡过程.肿瘤细胞中miRNA表达水平与正常细胞有显著差异.miRNA可以表现为致癌基因和抑癌基因,与肿瘤的发生发展密切相关,并有望成为新的治疗靶点.     

Amplifying tumour-specific replication lesions by DNA repair inhibitors - a new era in targeted cancer therapy

Many anti-cancer drugs used in the clinic today damage DNA, resulting in cell death either directly or following DNA replication. Many anti-cancer drugs are exclusively toxic to replicating cells and toxic lesions are formed when a replication fork encounters a damaged DNA template. Recent work shows that replication lesions, similar to those produced during anti-cancer therapy, are commonly associated with cancer aetiology. DNA replication lesions are present in cancer cells owing to oncogene expression, hypoxia or defects in the DNA damage response or DNA repair. Here, I review how novel therapies can exploit endogenous replication lesions in cancer cells and convert them to toxic lesions. The aim of these therapies is to produce similar lesions to those produced by DNA damaging anti-cancer drugs. The difference is that the lesions will be cancer-specific and produce milder side-effects in non-cancerous cells.     

乳癌组织中人宫颈癌癌基因的表达及意义

目的 探讨人宫颈癌癌基因（HCCR）在乳癌组织表达及意义。方法 TRIZOL法提取乳癌组织和癌旁正常组织以及乳癌病人和正常人外周血单个核细胞（PBMC）的RNA,用RT—PCR技术检测HCCR mRNA在不同样品中的表达水平。结果 在乳癌组织中,HCCR mRNA相对表达强度为0．836±0．106,癌旁正常组织中其相对表达强度为0．438±0．132,差异有显著性（t=6．63,P〈0．05）。在PBMC中,乳癌病人HCCR mRNA的表达强度为0．206±0．089,而正常人未检测出,两者比较差异有显著性（t=2．34,P〈0．05）。结论 HCCR基因可能参与了乳癌的发生与发展,与乳癌的病理过程有一定的相关性。     

Inflammation and cancer: the oncogene-driven connection

Inflammation has long been suspected to contribute to tumor growth. However, the concept that oncogenes, known for decades as responsible for cell neoplastic transformation, build up an inflammatory pro-tumorigenic microenvironment is emerging only in the last few years. The well known oncogenes RAS and MYC have been causally linked to tumor angiogenesis through different ways. Moreover, in thyroid tumors, where many of the genetic tumor-initiating events have been identified, the oncogenes driving tumorigenesis were proved able to induce an inflammatory program. This minireview will focus on growing evidence implicating the role of intrinsic, oncogene-driven pathways leading to pro-tumoral inflammation.     

MDM2蛋白和MDM2 mRNA在尖锐湿疣中的表达

目的 研究尖锐湿疣中MDM2蛋白及MDM2 mRNA的表达情况,探讨MDM2在尖锐湿疣增殖及癌变中的作用。方法 分别采用免疫组化染色及原位杂交方法检测外阴尖锐湿疣和正常人皮肤组织中MDM2蛋白及mRNA的表达情况,同时用PCR法检测人乳头瘤病毒(HPV)型别。结果 32例外阴尖锐湿疣中MDM2蛋白阳性表达18例(56.25%),MDM2 mRNA阳性表达22例(68.75%)。MDM2蛋白与mRNA共同阳性表达14例。PCR检测示尖锐湿疣皮损中HPV6/11型28例(87.5%),HPV16/18型4例(12.5%)。在18例MDM2蛋白阳性表达的标本中,HPV6/11型15例,HPV16/18型3例。在22例MDM2 mRNA阳性表达的标本中,HPV6/11型18例,HPV16/18型4例。而正常人皮肤中MDM2蛋白及MDM2 mRNA均未见表达。结论 MDM2的异常表达可能与尖锐湿疣过度增殖及癌变有关。     

Gene therapy strategies for the treatment of cancer. A review

This review summarizes current trends in cancer gene therapy. The diversity of approaches and rapid application of technical improvements reflects the interest in this emerging field. Major topics include the restoration of tumor suppressor genes and inhibition of oncogenes, stimulation of the immune response against tumors, and sensitization of cancer cells to systemically administered prodrugs. Special attention is focused on methodstumor targeting and the development of new vectors.      

Elf-1在胃癌组织中的表达及其临床意义

目的 探讨转录因子Elf-1在胃癌组织中的表达及其与胃癌临床病理学特征的关系.方法 采用免疫组织化学染色的方法检测70例胃癌组织及相应的癌旁组织、远癌黏膜组织中Elf-1的表达,分析Elf-1表达与胃癌及其临床病理特征的关系.结果 Elf-1在胃癌、癌旁组织、远癌黏膜组织中表达的阳性率分别为88.6%、55.7%、5.0%,Elf-1在胃癌中的表达率明显高于癌旁组织及远癌黏膜组织,差异有显著性(Hc=70.11,P<0.01);Elf-1在胃癌中的表达与分化程度、浸润深度、临床分期及淋巴结转移有关(Hc=-4.81～19.62,P<0.01).结论 Elf-1与胃癌的发生及发展有关,检测Elf-1的表达水平对于胃癌早期诊断及预后评估具有重要参考价值.     

甲状腺结节CT纹理分析参数与结节内癌基因表达水平的相关性研究

目的:分析甲状腺结节CT纹理分析参数与结节内癌基因表达水平的相关性.方法:选取医院行甲状腺结节切除术治疗的112例甲状腺结节患者,收集结节病灶标本145个,依据结节病理诊断结果将其分为良性组(36例,53个结节)和恶性组(76例,92个结节).采用荧光定量聚合酶链反应(PCR)法检测结节内癌基因和抑癌基因表达水平,分析...     

Expression of c-raf-1 and A-raf-1 during regeneration of rat liver following surgical partial hepatectomy

The major objective of this study was to investigate the expression of members of the raf family of proto-oncogenes during rat liver regeneration. The steady-state level of expression of both c-raf-1 and A-raf-1 increased three- to fivefold 18-24 h following partial hepatectomy, and it returned to basal levels by 72 h. Expression of c-myc and Ha-ras mRNA was increased at 3 and 18-24 h, respectively, confirming previous reports. Increased steady-state levels of c-raf-1, A-raf-1, and Ha-ras mRNA were also detected in hepatocytes isolated from rat liver 24 h after partial hepatectomy. Thus, elevated expression of the raf genes closely correlated with that of Ha-ras, beginning at 12 h and reaching maximal levels during the first peak of DNA synthesis following partial hepatectomy.