大肠肿瘤石蜡标本P53 mRNA RT-PCRIS比较研究

目的：探讨大肠肿瘤Ｐ５３ｍＲＮＡ转录改变。方法：对９例大肠癌和３例良性大肠肿瘤石蜡标本的肿瘤灶、移行区和自身正常肠组织,应用反转录原位ＰＣＲ技术进行了研究。结果：３例良性肿瘤中仅１例在肿瘤区组织检出弱阳性,９例大肠癌中,肿瘤区检出７例阳性,移行区检出４例阳性,自身正常肠组织检出１例阳性。结论：在肿瘤早期即可能出现Ｐ５３基因ｍＲＮＡ改变,应用ＲＴ－ＣＰＲＩＳ检出ｐ５３ｍＲＮＡ的阳性率高于常规免疫组化法,ＲＴ－ＰＣＲＩＳ具有很高的灵敏度和特异性,且可与组织结构联系进行分析。     

人鼻咽与鼻咽癌组织p53调节基因差异表达的研究

目的 用cDNA Array比较鼻咽癌组织及正常组织基因表达谱,研究鼻咽癌组织内p53调节基因表达差异。方法 Atlas人类肿瘤cDNA表达阵列7742－1滤膜杂交后,用AtlasImage 1.01a分析膜杂交结果,RT－PCR反应验膜杂交结果,免疫组化证实基因在蛋白质水平的表达改变。结果 在588个肿瘤相关基因中,共有134个基因表达上调,88个基因表达下调。膜上有p53调节基因32种,其中13种显示差异表达,有11个表达上调,2个表达下调。结论 在鼻咽癌组织内,p53的功能失控,MDM2、p21和Bax可能对鼻咽癌细胞的生长起重要的调控作用。     

Abnormal expression of MDM-2 in breast carcinomas

MDM-2 is a cellular oncoprotein that binds to the p53 protein and abrogates its growth-suppressing function. At least seven MDM-2 mRNAs and five proteins (p90, p85, p76, p74, and p57) have been reported in tissue culture. MDM-2 gene amplification occurs in human sarcomas and high-grade gliomas. MDM-2 overexpression without gene amplification has been reported in leukemias and lymphomas. Here we report MDM-2 mRNA overexpression in 24 (73%) out of 33 cases of human breast carcinoma as compared with normal breast tissue. The MDM-2 overexpression was seen in the absence of MDM-2 gene amplification. MDM-2 protein expression was studied by western blot analysis in 21 of these cases of carcinoma. We found complete concordance between MDM-2 mRNA overexpression and MDM-2 protein levels. MDM-2 proteins were overexpressed in 15 of 21 breast carcinoma tissue samples but not in normal breast tissue controls. Ten of these fifteen cases overexpressed MDM-2 p57 protein, two cases overexpressed both p57 and p90, and three cases overexpressed only p90. MDM-2 overexpression was confirmed by immunohistochemistry. p53 overexpression was also studied by immunohistochemistry; 69% of breast carcinomas that overexpressed the MDM-2 mRNA had detectable nuclear p53 protein. These findings demonstrate that MDM-2 oncoprotein expression is altered in primary human breast carcinomas at both mRNA and protein levels. In addition, our results suggest that MDM-2 p57 protein represents the main MDM-2 protein altered in breast carcinomas.     

Expression of P53, P27 and KI-67 in colorectal cancer patients of various ethnic origins: clinical and tissue microarray based analysis

BACKGROUND: This study was conducted to determine survival according to the expression of molecular markers in colorectal cancer (CRC) patients of various ethnic origins. METHODS: Resection of primary tumor was conducted on 171 patients with CRC. Corresponding archived paraffin-embedded blocks were retrieved and tissue microarray (TMA) constructed. Immunohistochemical staining of the TMA for p53, p27 and Ki-67 was quantified by two independent pathologists. Survival was analyzed using the Kaplan-Meier product limit method. RESULTS: With a median follow-up of 65 months, 56 patients (32.7%) died of disease. AJCC stage correlated with disease-free (DFS, P < 0.0001) and overall survival (OS, P < 0.0001). IHC staining was positive for Ki-67 in 77.4%, p53 in 55.8% and p27 in 54.2% of patients. Primary tumor marker expression did not correlate with DFS or OS. The 5-year DFS for Ashkenazi Jews was 75%, significantly higher than Sephardic Jews (SJ) 64% and Palestinian Arabs (PA) 38%, P = 0.001. CONCLUSIONS: Ethnicity among Ashkenazi and SJ and PA appears to have a significant impact on disease outcome in patients with CRC patients, while primary tumor expression of p53, p27 and Ki-67 was unrelated to disease outcome.     

转染外源p53基因在荷瘤裸鼠人肠癌细胞中表达的检测

采用直接注射外源ＤＮＡ－脂质体复合物的方法分别在荷瘤裸鼠人肠癌组织中转染外源正义ｐ５３ｃＤＮＡ和反义ｐ５３ｃＤＮＡ的重组表达质粒及非整合型哺乳动物表达载体ｐＲＥＰ９，并以注射等量生理盐水为对照，然后应用链菌素亲生物蛋白－过氧化酶免疫组化法检测肿瘤组织中突变型ｐ５３蛋白的表达。结果表明：体外培养ＳＷ１１１６细胞中约有５０％为突变型ｐ５３蛋白阳性；转染反义ｐ５３ｃＤＮＡ表达质粒组的裸鼠移植瘤细胞ｐ５３蛋白阳性率为２５％，而注射生理盐水、转染ｐＲＥＰ９及正义ｐ５３ｃＤＮＡ表达质粒组阳性率分别为６６．７％，７７．８％，６６．７％；前者与后三者之间有显著住差异（Ｐ＜０．０１，Ｘ［２］检验），但各组间肿瘤大小并无显著性差异。据此认为，肿瘤体内直接转染外源反义ｐ５３基因能封闭肠癌ＳＷ１１１６细胞中突变型ｐ５３基因的表达。     

应用cDNA微阵列芯片筛选胃癌相关基因

目的 :应用cDNA微阵列芯片技术筛选人胃腺癌和相对应正常胃黏膜间的差异表达基因。方法 :将 8192条人类基因PCR产物按微阵列排列点样于化学涂层的载玻片上 ,即制成cDNA微阵列芯片 ;抽提胃腺癌和相对应正常胃黏膜组织的RNA并纯化mRNA ;将等量的胃腺癌和相对应正常胃黏膜组织的mRNA分别逆转录合成荧光分子标记的cDNA做探针 ,混合后杂交上述cDNA微阵列芯片 ;经严格洗片后扫描芯片荧光信号图象 ,计算机分析后比较 2种组织中差异表达的基因。结果 :在 8192条基因中 ,共有 3 2 7条基因在胃腺癌和相对应正常胃黏膜组织间差异表达 ,其中 179条基因下调 ,14 8条基因上调。结论 :胃腺癌发生过程中有多基因的参与 ;cDNA微阵列芯片技术是筛选人胃腺癌相关基因的有效方法。     

非小细胞肺癌组织中FHIT、P53和P16蛋白的异常表达及其与临床病理的关系

目的 :研究非小细胞肺癌组织 (NSCLC)中脆性组氨酸三联体 (FHIT)蛋白 (Fhit)、P5 3蛋白 (P5 3)和P16蛋白 (P16 )异常表达及其与临床病理的关系。方法 :应用免疫组织化学方法检测NSCLC组织中Fhit、P5 3及P16的表达 ,用 χ2 检验分析其异常表达与临床病理参数之间的相关性。结果 :NSCLC组织中Fhit、P5 3及P16的异常表达率分别为 6 2 .2 % (5 6 / 90 )、4 8.9% (4 4 / 90 )和 4 6 .7% (4 2 / 90 ) ;除了Fhit异常表达显著多见于鳞癌 (SqCC ,P <0 .0 0 1)和吸烟者 (P =0 .0 32 )、P16多见于非鳞癌 (non SqCC)以及P5 3异常多见于N2淋巴结转移 (P =0 .0 39)外 ,三者的异常表达与其他临床病理参数 (包括年龄、性别、肿瘤大小和分期等 )均无相关性。结论 :Fhit的表达缺失 ,与P5 3、P16异常表达一样 ,是非小细胞肺癌中常见事件。     

人胃癌腹膜高转移潜能细胞系的基因表达分析

目的:比较人胃癌细胞系与其腹膜高转移潜能细胞系的基因表达谱,寻找与胃癌腹膜转移相关的基因表达改变。方法:采用基因芯片技术,比较遗传背景相同但转移力有明显差异的两个细胞系GC9811和GC9811-P,分析其基因表达谱的差异。选取部分基因行RT-PCR进一步验证基因芯片的准确性。结果:在11901个候选基因中,筛选出248个(2.1%)差异表达基因。GC9811-P与GC9811相比,表达上调的基因有218个,下调的有30个,包括DNA合成和错配修复基因如H3F3A、细胞增生基因、蛋白合成与修饰基因、信号传导基因和离子通道与运输蛋白相关基因等。半定量RT-PCR对PTEN、S100A4和ZNRD1基因检测结果验证了基因芯片数据的可靠性。结论:胃癌腹膜转移是多基因作用的综合结果,筛选的基因对预测胃癌腹膜转移和抗转移干预措施可能有指导意义。     

EXPRESSION OF P53 AND C-MYC IN MOUSE LUNG CANCER INDUCED BY COAL BURNING

ＥＸＰＲＥＳＳＩＯＮＯＦＰ５３ＡＮＤＣ－ＭＹＣＩＮＭＯＵＳＥＬＵＮＧＣＡＮＣＥＲＩＮＤＵＣＥＤＢＹＣＯＡＬＢＵＲＮＩＮＧＬｉｎＣｈｕｎｙａｎ林春艳，ＤａｉＸｕｄｏｎｇ戴旭东，ＳｕｎＸｉｗｅｎ孙喜文，ＬｉＦｅｎｇｈｕａ李风华，ＳｈｉＹｕｂｏ石于波（Ｃａ...     

Differential gene expression profiles of DNA repair genes in esophageal cancer cells after X-ray irradiation

Bckground and Objective: Various factors affect the radioresistance of tumor cells, with unknown molecular mechanism(s). Many genes have been found to associate with the radioresistance of tumor cells, however, the precise mechanism of these genes have not been elucidated. This paper was to analyze the differential expressions of DNA repair genes in esophageal carcinoma cells at different time after X-ray irradiation, and to investigate the role of these DNA repair genes in radiation resistance. Methods: Es...     

肺癌p14ARF和p16INK4a基因协同表达缺失及其意义

目的：研究抑癌基因位点ＩＮＫ４ａ－ＡＲＦ在肺肿瘤细胞中的表达状况,揭示ｐ１４ＡＲＦ和ｐ１６ＩＮＫ４ａ协同表达缺失与肺癌发生发展的相关性。方法：用ＲＴ－ＰＣＲ和Ｗｅｓｔｅｒｎ ｂｌｏｔ对６株肺癌细胞（ＳＰＣ－Ａ－１,Ｃａｌｕ－１,Ｈ４４６,ＳＨ７７,Ａ５４９,Ｈ４６０）的ＩＮＫ－４ａ－ＡＲＦ基因位点在ｍＲＮＡ、蛋白水平上进行检测,对ＰＣＲ产物进行纯化和测序分析。结果：６株肺癌细胞中,有３株细胞（Ｈ４     

Secretory expression of p53(N15)-Ant following lentivirus-mediated gene transfer induces cell death in human cancer cells

p53 (N15)-Ant 32-peptide has been considered a novel and effective peptide for cancer therapy. To further enhance its anticancer effect and overcome the limitation of peptide therapy, a recombinant lentivirus was constructed in this study with the following strategies: the secretory expression of therapeutic peptide and lentivirus gene transfer system. The results demonstrated that LV-NT4(Si)-p53 (N15)-Ant could significantly suppress cell growth and induce rapid cell death in MCF-7 (overexpressed wild-type p53), HepG2(wide-type p53), OVCAR-3 (mutant type p53) and H1299 (null p53)cells in time-dependent manners through successful gene transfer and secretory expression of therapeutic peptide at 48 h post-infection. Transmission electron microscopy and flow cytometric analysis revealed that LV-NT4(Si)-p53 (N15)-Ant could induce two different kinds of cell death (necrosis and apoptosis) by two different mechanisms, since p53 (N15)-Ant peptide has the potential of blocking interaction of mdm-2 with other protein target, and on the other hand, it could form S-shape helix-loop-helix structures, which is able to rapidly disrupt cancer cell membranes. Based on these finding, LV-NT4 (Si)-p53 (N15)-Ant may be a novel recombinant virus because it induces cell death by two different pathways.     

野生型p53基因蛋白在氨肽酶抑制剂诱导人白血病细胞株K562细胞凋亡的实验研究

目的研究野生型p53基因蛋白对国产氨肽酶抑制剂乌苯美司(ubenimex)诱导人白血病细胞凋亡的影响及其作用机制。方法真核转导试剂FuGEMNE^TM6转导入K562细胞，免疫组化法检测细胞p53蛋白的表达，DNA片段原位末端标记及流式细胞仪(FCM)检测细胞凋亡，Rhodamin(Rh)123染色后，FCM检测细胞线粒体跨膜电位。结果p53基因cDNA转导的细胞p53蛋白表达增加；p53基因转导能促进ubenimex诱导K562细胞凋亡并增加ubenimex诱导的K562细胞线粒体跨膜电位(△ψm)的下降。结论野生型p53基因转导能促进ubenimex诱导K562细胞凋亡，并可能参与线粒体信号传导通路的调控。     

应用低密度芯片初步筛选胃癌淋巴转移相关基因的研究

目的:运用低密度cDNA芯片技术初步筛选影响胃癌淋巴结转移的分子标志。方法:运用自制低密度cDNA芯片检测15例胃癌患者原发癌灶和淋巴结转移癌中多个基因mRNA表达,并用RT-PCR方法进行验证,分析其与胃癌侵袭和淋巴结转移的相关性。结果:hTERT在淋巴结转移癌中表达明显高于胃原发癌灶(P= 0．001)。原发癌灶中MMP-7和Heparanase表达在小结节孤立型淋巴结病例中明显高于大结节融合型者(P值分别为0．022和0．002),而CDH1表达明显降低(P= 0．002);淋巴结转移癌灶中CDH1表达在小结节孤立型淋巴结病例中亦明显降低(P=0．046)。按淋巴结转移个数分成轻重两组(≤6个为轻度转移,≥7个为重度转移),原发癌灶中MMP-7和hTERT表达在重组明显高于轻组(P值分别为0．001和0．005);淋巴结转移癌灶中MMP-7、S100A4和hTERT基因表达在重组明显增高(P值分别为0．000 05、0．007和0．016),而nm23H1和CDH1表达明显降低(P值分别为0．013和0．001)。胃原发癌中MMP-7、Heparanase、S100A4过表达和(或)nm23H1、CDH1、KAI-1表达降低或缺失者,胃癌多侵透浆膜,且浆膜受侵面积较大。结论:hTERT、MMP-7、S100A4、Heparanase、CDH1和nm23H1基因表达与胃癌淋巴结转移关系密切,可望成为胃癌淋巴结转移诊断和治疗的分子靶点。     

组织芯片应用于原发性鼻咽癌中p53表达的高通量分析

目的 :通过对不同临床分期鼻咽癌(NPC)中 p5 3蛋白表达的进一步研究 ,探讨高通量组织微阵列技术 (high throughputtis suemicroarray)应用于大规模临床标本高效筛查的可行性。方法 :用组织阵列仪 (tissuearrayer)制备连续系列分区排列的组织芯片 ,然后用 p5 3单抗免疫组织化学法检测一张组织芯片上 3 2 0例各类型的鼻咽活检组织标本中 p5 3蛋白表达 ,并分析 p5 3表达在不同鼻咽组织的分布状况及其与临床分期的相关性。结果 :在正常鼻咽黏膜组织、癌旁组织及癌组织中 p5 3蛋白的检出率分别为 0 ( 0 / 2 9)、16 7% ( 4 / 2 4)及 61 4% ( 164 /2 67) ,NPC组织中 p5 3蛋白表达率明显高于其他鼻咽非癌组织 ,P <0 0 0 1,其中癌旁 4例全为弱阳性 ,癌组织中 164例中弱阳性为112例 ,占 41 9% ( 112 / 2 67) ,而强阳性为 5 2例 ,占 19 5 % ( 5 2 / 2 67) ;p5 3表达与鼻咽癌的临床分期无显著相关性 ,P =0 0 78,而p5 3过表达 (强阳性 )却与鼻咽癌的临床中晚期密切相关 ,P =0 0 0 71。结论 :鼻咽癌中 p5 3蛋白的高频核积累提示p5 3蛋白功能的抑制在鼻咽癌的发生发展中起重要作用 ;应用组织芯片 (tissuechip)大规模高效筛查临床组织标本是可行性的 ,具有快速、方便、经济的特点