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1.
目的: 研究4.1B蛋白在食管鳞状细胞癌组织中的表达及异常表达的分子机制.方法: 采用免疫组织化学法检测110例石蜡包埋食管鳞状细胞癌及癌旁组织中4.1B蛋白的表达水平.随机选取其中29例,应用微卫星PCR技术检测4.1B等位基因的杂合子丢失情况.应用甲基化特异PCR技术检测33例新鲜食管鳞状细胞癌手术标本的4.1B基因启动子区域的甲基化状态.结果: 食管鳞状细胞癌组织中4.1B蛋白的阳性表达率为60.9%(67/110),癌旁正常组织的阳性表达率为94.5%(104/110),2组之间差异有统计学意义(X2=35.945,P<0.01).食管鳞状细胞癌高、中、低分化组的阳性表达率分别为74.4%(29/39)、61.8%(21/34)和45.9%(17/37),3组之间差异有统计学意义(X2=6.453,P<0.05).在20.7%(6/29)的食管鳞状细胞癌组织中,分别于D18S481、D18S62和D18S391这3个微卫星位点检测到4.1B等位基因的杂合子缺失.在33例新鲜手术标本中,有69.7%(23/33)的食管鳞状细胞癌组织检测出4.1B基因启动子区域的甲基化.结论: 4.1B蛋白在食管鳞癌组织中的阳性表达率明显低于癌旁正常组织,食管鳞状细胞癌的分化程度与其表达量呈正相关;启动子区域的异常甲基化可能是4.1B蛋白阴性表达的重要原因.  相似文献   

2.
Esophageal squamous cell carcinoma (ESCC) is one of the most common malignancies worldwide. To identify potential diagnostic markers for ESCC and therapeutic targets for ESCC, we used Serial Analysis of Gene Expression (SAGE) on one ESCC sample. We obtained a total of 14 430 tags, including 5765 that were unique. By comparing SAGE tags from the ESCC sample with those from normal human squamous esophagus, we found several genes that were differentially expressed between ESCC and normal squamous esophagus. Among these, we focused on the ADAM metallopeptidase with thrombospondin type 1 motif, 16 (ADAMTS16) gene because quantitative RT‐PCR analysis showed a high level of ADAMTS16 expression in eight out of 20 ESCC samples (40%), but not in 15 kinds of normal tissues. Western blot analysis also showed upregulation of ADAMTS16 protein in ESCC tissues. Furthermore, ADAMTS16 protein was detected in culture media from the TE5 esophageal cancer cell line. Knockdown of ADAMTS16 in TE5 cells inhibited both cell growth and invasion ability. Our present SAGE data provide a list of genes potentially associated with ESCC. ADAMTS16 could be a novel diagnostic and therapeutic target for ESCC. (Cancer Sci 2010; 101: 1038–1044)  相似文献   

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目的:分析食管鳞癌(ESCC)细胞系的染色体异常,为将来寻找食管癌相关基因提供线索。方法:采用比较基因组杂交法(CGH)分析3种ESCC细胞系的染色体DNA拷贝数改变情况。结果:9q(3/3)、3q(2/3)、5q(2/3)、5p(2/3)、8q(2/3)、12p(2/3)和20q(2/3)为常见的染色体增加区。4q(2/3)和6q(2/3)是常见的染色体丢失区。结论:这些常见的染色体异常有助于寻找和定位食管癌相关基因。  相似文献   

5.
Li Y  Chen L  Nie CJ  Zeng TT  Liu H  Mao X  Qin Y  Zhu YH  Fu L  Guan XY 《Cancer research》2011,71(19):6106-6115
Deletions on chromosome 3p occur often in many solid tumors, including esophageal squamous cell carcinoma (ESCC), suggesting the existence at this location of one or more tumor suppressor genes (TSG). In this study, we characterized RBMS3 gene encoding an RNA-binding protein as a candidate TSG located at 3p24. Downregulation of RBMS3 mRNA and protein levels was documented in approximately 50% of the primary ESCCs examined. Clinical association studies determined that RBMS3 downregulation was associated with poor clinical outcomes. RBMS3 expression effectively suppressed the tumorigenicity of ESCC cells in vitro and in vivo, including by inhibition of cell growth rate, foci formation, soft agar colony formation, and tumor formation in nude mice. Molecular analyses revealed that RBMS3 downregulated c-Myc and CDK4, leading to subsequent inhibition of Rb phosphorylation. Together, our findings suggest a tumor suppression function for the human RBMS3 gene in ESCC, acting through c-Myc downregulation, with genetic loss of this gene in ESCC contributing to poor outcomes in this deadly disease.  相似文献   

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Background. A critical role of Epstein-Barr virus (EBV) in carcinogenesis of nasopharyngeal squamous cell carcinoma and gastric adenocarcinoma is strongly suspected. We analyzed the possible EBV association for Japanese squamous cell carcinoma (SCC)-dominant esophageal cancer cases. Methods. We retrospectively screened 36 surgically resected esophageal cancer lesions from 36 patients maily with SCC using in situ hybridization (ISH) for EBV-encoded small RNA1 (EBER-1). EBV DNA analysis using real-time quantitative polymerase chain reaction (Q-PCR) was performed for three recent cases. Results. We found no EBER-1-positive cancer cell in any tested esophageal cancer lesion. There were many EBER-1-positive tumor-infiltrating lymphocytes in the basaloid SCC lesion and a small number of positive lymphocytes in the other five advanced SCC lesions (14.7% of SCC). One SCC lesion with a highcopy number of EBV DNA had EBER-1-positive lymphocytes. Conclusions. EBV is rarely associated with esophageal SCC, and may appear through tumor-infiltrating lymphocytes in some advanced lesions.  相似文献   

8.
A human oncoprotein-designed cancerous inhibitor of PP2A (CIP2A) has been recently identified, which can stabilize c-Myc protein by inhibiting its degradation mediated by protein phosphatase 2A (PP2A) in tumor cells and promote the proliferation of various cancer cells. Esophageal squamous cell carcinoma (ESCC) is a highly aggressive cancer with poor prognosis worldwide. However, the underlying molecular mechanism of the development of ESCC is still poorly understood. In the present study, the CIP2A expression between normal and malignant esophageal tissues was compared by immunohistochemical analysis; moreover, the mechanisms of CIP2A-mediated tumorigenesis were investigated by evaluating its role in cell proliferation, cell cycle, apoptosis and senescence. We found that the positive staining of CIP2A was found in 36 of 40 (90%) of cancer tissues, whereas only 8 of 40 (20%) normal esophageal mucosa exhibited positive CIP2A staining. The CIP2A is significantly overexpressed in human esophageal tumors when compared with normal tissues (χ2 = 39.6, P < 0.01). On the other hand, the CIP2A expression was not associated with age, gender, tumor burden, or differentiation status. Depletion of CIP2A expression led to impaired clonogenicity and senescence, which is the primary mechanism of CIP2A in oncogenesis. Therefore, CIP2A may be a candidate in diagnosis and therapy of esophageal cancer.  相似文献   

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Tumor Biology - The three amino acid loop extension (TALE) class myeloid ecotropic viral integration site 1 (MEIS1) homeobox gene is known to play a crucial role in normal and tumor development. In...  相似文献   

11.
Esophageal squamous cell carcinoma (ESCC) is one of the most common lethal tumors in the world. Thus, it is very urgent to develop new therapeutic targets against this disease. The mevalonate (MVA) pathway, paced by its rate-limiting enzyme, hydroxymethylglutaryl coenzyme A reductase, is required for the generation of several fundamental end products including cholesterol and isoprenoids. The function of the MVA pathway in ESCC has not been investigated. In this study, it was found that the MVA pathway was upregulated in ESCC clinical samples. Statin, the inhibitor of the MVA pathway, exerted potent cytotoxicity against human ESCC cells by inhibiting cell growth and proliferation, while it exerted lesser effects on non-tumorigenic SHEE cells. Further study revealed that statin could potently induce cell apoptosis and cell cycle arrest and also dose-dependently inhibit the growth of xenograft tumors in nude mice. With regard to the molecular mechanism, statin treatment was related to decreased extracellular signal-regulated kinase activation and proliferating cell nuclear antigen, cyclin D1 expression, and increased cleavage of poly(ADP-ribose) polymerase. Taken together, our findings suggest that the MVA pathway plays an important role in the progression of ESCC by modulating cell growth and statin might be a potential therapeutic agent in ESCC.  相似文献   

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To evaluate the potential of zinc finger protein 1 (ZPR1) as a diagnostic biomarker and explore the underlying role for esophageal squamous cell carcinoma (ESCC). A human proteome microarray was customized to identify anti-ZPR1 autoantibody, and enzyme-linked immunosorbent assay (ELISA) was adopted to assess the diagnostic performance of anti-ZPR1 autoantibody in 294 patients with ESCC and 294 normal controls. The expression of ZPR1 protein was measured by immunohistochemistry. The effect of ZPR1 on the proliferation, migration, and invasion of ESCC cells was investigated through CCK-8, wound healing, and Transwell assays. The expression level of anti-ZPR1 autoantibody (fold change = 2.77) in ESCC patients was higher than that in normal controls. The receiver operating characteristic (ROC) analysis manifested anti-ZPR1 autoantibody achieved area under the ROC curve (AUC) of 0.726 and 0.734 to distinguish ESCC from normal controls with sensitivity of 50.0% and 42.3%, and specificity of 91.0% and 92.0% in the test group and validation group, respectively. The positive rate of ZPR1 protein was significantly higher in ESCC tissues (75.5%, 80/106) than paracancerous tissues (9.4%, 5/53). Compared with the human normal esophageal cell line, the expression level of ZPR1 mRNA and protein in ESCC lines (KYSE150, Eca109, and TE1) had an increased trend. The knockdown or overexpression of ZPR1 reduced and enhanced the proliferation, migration, and invasion of ESCC cell, respectively. ZPR1 was a potential immunodiagnostic biomarker for noninvasive detection and could be a promotional factor in tumor progression of ESCC.  相似文献   

14.
PGP9.5/UCHL1 is a member of the carboxyl-terminal ubiquitin hydrolase family with a potential role in carcinogenesis. We previously identified PGP9.5 as a putative tumor-suppressor gene and methylation of the promoter as a cancer-specific event in primary cancer tissues. In this current study, we analyzed PGP9.5 methylation in 50 esophageal squamous cell carcinoma (ESCC) primary tumors with well characterized clinicopathologic variables including patient outcome. Two independent modalities for methylation analysis (TaqMan methylation-specific PCR and combined bisulfite restriction analysis) were used to analyze these samples. The two data sets were consistent with each other, as the 21 patients (42%) with highest methylation levels by TaqMan analysis all showed visible combined bisulfite restriction analysis bands on acrylamide gels. Using an optimized cutoff value by TaqMan quantitation, we found that patients with higher PGP9.5 methylation ratios in the primary tumor showed poorer 5-year survival rates than those without PGP9.5 methylation (P = 0.01). A significant correlation was also seen between PGP9.5 promoter methylation and the presence of regional lymph node metastases (P = 0.03). Multivariate analysis subsequently revealed that PGP9.5 methylation was an independent prognostic factor for ESCC survival (P = 0.03). These results suggest that PGP9.5 promoter methylation could be a clinically applicable marker for ESCC progression.  相似文献   

15.
The coinhibitory molecules, B7-H3 and B7-H4, have shown negative regulation in T cell activation and tumor-associated macrophage (TAM) polarization in tumor-specific immunity. Here, we investigated the expression of B7-H3 and B7-H4 in human and murine esophageal squamous cell carcinoma (ESCC) tissues to define their clinical significance and mechanism in a tumor microenvironment. In the present study, B7-H3 and B7-H4 were expressed in 90.6 and 92.7 % samples, respectively. High B7-H3 and B7-H4 expression was associated with advanced TNM stage and lymph node metastasis (p?<?0.05, respectively). Patients with both B7-H3 and B7-H4 high-expressed tumors had the poorest prognosis (26.7 months), whereas those with both low-expressed tumors had the best survival (56.7 months). B7-H3 and B7-H4 expression were inclined to be positively related to the infiltration intensity of Treg cells and TAMs (p?<?0.05, respectively), and B7-H3 expression is negatively associated with the intensity of CD8+ T cells (p?<?0.05). In 4-nitroquinoline 1-oxide (4-NQO)-induced murine models, high B7-H3 expression could only be detected at carcinoma stage, but abnormal B7-H4 expression appeared a little earlier at dysplasia stage. In vitro studies revealed that knockdown of B7-H3 on tumor cells suppressed ESCC cell migration and invasion, while knockdown of B7-H4 could inhibit ESCC cell growth. Overall, B7-H3 and B7-H4 are involved in ESCC progression and development and their coexpression could be valuable prognostic indicators. Interference of these negative regulatory molecules might be a new strategy for treating ESCC.  相似文献   

16.
BACKGROUND: In our previous study, it was suggested that nitrotyrosine, a product of nitrogen species, found in esophageal squamous cell carcinoma (ESCC), may contribute to the progression of esophageal cancer. MATERIALS AND METHODS: To clarify whether nitrotyrosine expression is associated with apoptosis and/or angiogenic factors in ESCC, we have analyzed the relationship between nitrotyrosine presence and the apoptosis-related proteins, Bcl-2 and Bax, or CD34, the marker of vascular endothelial cells, by an immunohistochemical approach. RESULTS: Nitrotyrosine was detected in 21 out of 55 esophageal cancers. The correlation between nitrotyrosine presence and Bcl-2, Bax expression or apoptotic index (AI) was not significant. In contrast, nitrotyrosine presence was significantly correlated with the microvessel density (MVD); nitrotyrosine-positive specimens tended to show a high MAD, while nitrotyrosine-negative specimens tended to be associated with a low MVD (p<0.05). CONCLUSION: Our data suggest that NO induces progression of esophageal carcinoma through its effect on angiogenesis, rather than its effect on tumor apoptosis.  相似文献   

17.
Esophageal squamous cell carcinoma (ESCC) is one of the most common lethal tumors in the world, and the development of new therapeutic targets is needed. Recent studies have shown that aerobic glycolysis, also known as the Warburg effect, mediated the anti-apoptotic effects in cancer cells. Lactate dehydrogenase A (LDHA) which executed the final step of aerobic lactate production has been reported to be involved in the tumor progression. However, the function of LDHA in ESCC has not been investigated. In this study, it was found that LDHA was up-regulated in ESCC clinical samples. Knockdown of the expression of LDHA inhibited cell growth and cell migration in vitro as well as tumorigenesis in vivo. With regard to the molecular mechanism, silencing the expression of LDHA was related to decreased AKT activation and cyclin D1 expression and increased cleavage of PARP and caspase 8. Taken together, our findings suggest that LDHA plays an important role in the progression of ESCC by modulating cell growth, and LDHA might be a potential therapeutic target in ESCC.  相似文献   

18.
目的:探讨Survivin、Survivin-△Ex3及VEGF在食管癌细胞诱导血管形成中作用的相关性.方法:用食管鳞癌肿瘤条件培养基培养人脐静脉内皮细胞,用ELISA法检测肿瘤条件培养基中VEGF蛋白的表达情况.用RT-PCR法检测内皮细胞中Survivin、Survivin-△Ex3及VEGF的表达情况.结果:肿瘤条件培养基中VEGF蛋白表达随培养时间呈上升趋势.实验组人脐静脉内皮细胞中Survivin在更换肿瘤条件培养基后4及10 h时表达明显增加,与对照组比较差异有统计学意义(CMvsRPMI:4 h:1.019 7±0.058 8 vs 0.658 8±0.043 7,P=0.000 5;10 h:0.797 1±0.074 4 vs0.444 9±0.041 2,P=0.001 0),而Survivin-△Ex3在实验组和对照组间的表达差异无统计学意义(CM vs RP-MI:4 h:0.423 7±0.087 0 vs 0.294 0±0.043 1,P=0.109 1;10 h:0.372 7±0.084 8 vs 0.226 4±0.009 2,P=0.078 1),VEGF在4及10 h时表达明显下降,与对照组比较差异有统计学意义(CMvsRPMI:4 h:0.276 7±0.065 8 vs 0.977 8±0.044 5,P=0.000 0;10 h:0.173 9±0.024 1 vs 0.917 8±0.124 7,P=0.004 8).结论:食管癌肿瘤条件培养基可通过VEGF作用于人脐静脉内皮细胞表面的受体,进而增加人脐静脉内皮细胞中Survivin的表达,促进肿瘤新生血管形成,同时抑制血管内皮细胞中VEGF的表达,这为食管癌肿瘤血管形成的发生机制及防治提供一定的实验依据.  相似文献   

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目的:分析食管鳞癌组织的常见基因组DNA改变,以期获得可能用于该病诊断和预后判断的分子标志。方法:对112例食管鳞癌手术组织标本,提取基因组DNA采用聚合酶链式反应(PCR)和变性聚丙烯酰胺凝胶电泳(PAGE)检测位于染色体3p和13q上的6个微卫星的杂合性丢失(LOH)情况,并与我们已报道的高频基因突变进行联合分析。结果:在被测的微卫星中,D3S1768的LOH频率最高,为48.9%;D3S2452的LOH最低,为28.8%。当与所测突变联合分析时,发现一个较优的组合,包括D3S1768、D13S171、D13S1493、TP53和TTN,该组合中任意2个标志同时出现异常改变的频率为75.6%,远高于任何单一标志的改变频率。生存分析的结果显示,在本组病例中所测微卫星LOH频率与患者生存率之间无统计学相关性,但PBRM1和SYNE2基因突变多存在于生存期较短的病例中。当将基因突变与淋巴结转移联合分析时,发现这两类指标同为阳性患者的总生存期显著短于仅有其一阳性或均为阴性的患者(P=0.027)。结论:食管鳞癌组织中存在较高频率的微卫星D3S1768杂合性丢失,包括TP53突变的标志物组合有助于提高检测食管鳞癌的敏感度,PBRM1、SYNE2基因突变联合淋巴结转移可作为食管鳞癌预后判断的指标。  相似文献   

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微小 RNA(miRNA)可通过细胞信号转导、上皮间质转化、血管生成等调控机制影响食管鳞状细胞癌细胞的增殖、凋亡、侵袭和转移。特定的血清 miRNA 可作为食管鳞状细胞癌诊断、预后的新型肿瘤标志物。近来研究表明 miRNA 可提高食管鳞状细胞癌放疗敏感性甚至逆转多药耐药,具有极大的临床价值。  相似文献   

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