Pinx1 在口腔鳞癌中的表达及意义

目的:研究Pinx1在口腔鳞状细胞癌(OSCC)中的表达及意义。方法:免疫组织化学染色检测Pinx1在60例OSCC和20例正常口腔黏膜组织(NOM)中的表达情况。结果:Pinx1在NOM上皮中高表达,高表达率为100.00%,在OSCC中高表达率为65.00%,Pinx1高表达率明显低于NOM(P＜0.05),随着分化程度的降低,Pinx1表达呈降低趋势(P＜0.05),伴有淋巴结转移的病例中Pinx1表达水平显著低于不伴有淋巴结转移的OSCC(P＜0.05),Pinx1的表达情况与患者性别年龄无关。结论:Pinx1可能与OSCC的发生、发展及转移有关。     

p53-p21waf1通路在口腔鳞状细胞癌中心体扩增中的作用及意义

目的 了解口腔鳞状细胞癌(oral squamous cell cancer,OSCC)p21waf1蛋白表达与中心体扩增的相关性,探讨p53-p21waf1通路在OSCC中心体扩增中的作用及意义.方法 8例正常口腔黏膜及27例OSCC石蜡包埋组织,采用间接免疫荧光双重染色法了解OSCC组织中心体扩增情况;采用流式细胞术及免疫组织化学方法对相应组织p21waf1蛋白表达量及突变型p53蛋白进行检测,分析三者间的相关性.结果 中心体数目扩增(＞2个/细胞)可见于78%(21/27)的OSCC组织,p21waf1蛋白表达量在有中心体扩增的OSCC组织中[(0.878±0.081)]低于无中心体扩增的OSCC组织[(0.952±0.018),t=3.838,P=0.001],OSCC组织中心体扩增程度与p21waf1蛋白表达量间存在负相关关系(r=0.472,P＜0.05);p21waf1蛋白表达量在OSCC组织p53阳性组[(0.823±0.071)]低于p53阴性组[(0.909±0.075),t=3.905,P＜0.01],两者间存在负相关关系(r=-0.491,P＜0.05).结论 p53-p21waf1通路可能参与了OSCC中心体循环调控,p53突变导致的p21waf1蛋白表达下调在OSCC中心体扩增中可能起一定作用.     

Osteopontin (OPN) distribution in premalignant and malignant lesions of oral epithelium and expression in cell lines derived from squamous cell carcinoma of the oral cavity

The objectives of this study were to assess the immunolocalization of human osteopontin (OPN) in oral lesions and to identify human cell lines of oral squamous cell carcinoma (OSCC) origin that express OPN mRNA. OPN was localized using immunohistochemistry in the following oral specimens: normal epithelium (n=6), epithelial hyperplasia (n=4), epithelial dysplasia (n=28), carcinoma in situ (n=11) and squamous cell carcinoma (n=43). Cell lines UMSCC-1, MDA TU 138, MDA 686LN, SCC4, SCC9, SCC25, CAL 27 and MDA 1483 were characterized for OPN mRNA expression using Northern blotting. OPN was not detected in normal oral epithelium. Intracellular and intercellular immunore-activity was seen in 75% of hyperplasias, 57% of dysplasias, 54% of carcinoma in situ and 67% of squamous cell carcinomas. UMSCC-1 expressed high levels of OPN mRNA. We conclude that OPN protein is detectable in premalignant and malignant lesions arising from oral epithelium. UMSCC-1 may be a useful cell line in which to conduct in vitro studies designed to clarify the role of OPN in OSCC.     

The clinical significance of CDK1 expression in oral squamous cell carcinoma

Objectives: To evaluate the clinical significance of cyclin-dependent kinase 1 (CDK1) in 77 oral squamous cell carcinomas (OSCC) using immunohistochemical methods. Study Design: Immunohistochemical expression of CDK1 was compared with various clinicopathological features in 77 OSCC and 60 controlled epithelia adjacent to the tumours. In addition, correlation of CDK1 expression and prognostic and the 5-year accumulative survival rate of OSCC were investigated. Results: The CDK1 protein was expressed in 52 cases of 77 tumor tissues (67.5%), compared with 21 cases of 60 controlled (35.0%). The expression of CDK1 was significantly correlated with the histological grade of OSCC (P<0.05). The CDK1 protein was over-expressed in recurrent tumors or in those with lymph node metastasis. Statistical analysis showed a significant reduction in the 5-year accumulative survival rate in CDK1 positive cases compared with CDK1 negative cases (P<0.05). Namely, the CDK1 positive patients had poor prognosis. Conclusions: The expression of CDK1 might serve as malignant degree and prognostic markers for the survival of OSCC. Key words:Cyclin-dependent kinase 1 (CDK1), oral squamous cell carcinoma (OSCC), immunohistochemistry, cell proliferation.     

MDC1蛋白在口腔鳞状细胞癌中的表达及意义

目的：探讨口腔鳞状细胞癌中MDC1（mediator of DNA damage cheekpoint protein1）蛋白的表达水平及意义。方法：采用免疫组织化学Envision法检测10例正常口腔黏膜、60例口腔鳞状细胞癌中MDC1的表达水平．并分析其与临床病理参数之间的关系。结果：MDC1蛋白在口腔鳞状细胞癌中表达高于正常口腔黏膜，两者之间差异有统计学意义（P=0．042），而且MDC1蛋白的表达升高与淋巴结转移有关（P=0．033），但与病理分级（P=0．986）、患者的年龄（P=0．723）、性别（P=0．142）无关。结论：MDC1蛋白在口腔鳞状细胞癌中表达增高，提示它可能在肿瘤的发生和发展中具有一定的作用，为进一步理解细胞DNA损伤与肿瘤发生的关系提供了依据。     

口腔黏膜癌变过程中Bmi-1及P16蛋白的表达及意义

目的:了解Bmi-1及P16蛋白在口腔黏膜癌变过程中的表达情况,探讨Bmi-1-P16通路在口腔鳞癌发生发展中的作用及意义。方法::正常口腔黏膜10例、上皮异常增生31例、口腔鳞癌61例的石蜡包埋组织,采用免疫组化SP法检测Bmi-1及P16表达情况,分析二者的相关性及其临床病理学意义。结果:Bmi-1在正常口腔黏膜、上皮异常增生及OSCC组织中的阳性率分别为0%、29%(9/31)和62.3%(38/61);P16在正常、上皮异常增生及OSCC组中的阳性率分别为100%(10/10)、77.4%(24/31)和47.5%(29/61)。OSCC中Bmi-1阳性率在P16阴性组高于P16阳性组,差异有统计学意义(P<0.05),Spearman相关分析显示两者间具负相关关系(r=-0.414,P<0.05)。Bmi-1阳性表达及Bmi-1高表达且P16失表达与OSCC临床分期及淋巴结转移密切相关(P<0.05)。结论:Bmi-1过表达是口腔黏膜癌变过程中的早期事件,口腔鳞癌中Bmi-1过表达可能与P16失表达有关并与临床分期及淋巴结转移密切相关,有可能作为临床评估口腔鳞癌浸润、转移和预后的参考指标之一。     

口腔鳞状细胞癌中CADM1蛋白的表达及意义

目的：研究细胞粘附分子1（cell adhesion molecule 1,CADM1）在口腔鳞状细胞癌（Oral squamous cell car-cinoma,OSCC）中的表达,探讨其在OSCC病变中的作用及其临床意义。方法：应用免疫组织化学法S-P法检测52例OSCC及30例正常的口腔黏膜组织中CADM1蛋白的表达,数据采用SPSS13.0统计软件进行χ2检验。结果：CADM1蛋白在高分化组阳性表达率为87.50%、中分化组阳性表达率为42.86%、低分化组阳性表达率为20.00%,三者之间对比有显著性差异（P〈0.05）,与正常对照组有显著性差异（P〈0.01）;在临床分期为早期（Ⅰ级＋Ⅱ级）组中阳性表达率为72.22%,晚期（Ⅲ级＋Ⅳ级）组中阳性表达率为35.29%,二者之间存在显著性差异（P〈0.05）。结论：CADM1蛋白的表达与OSCC的病理分级、临床分期关系密切,提示CADM1蛋白缺失可能是OSCC的发生机制之一。     

口腔鳞癌组织中Galectin-1表达及其临床意义

目的:探讨口腔鳞癌组织中半乳糖凝集素1(Galectin-1)基因与蛋白质的表达水平及其临床意义。方法:分别采用荧光实时定量RT-PCR和免疫组织化学方法,检测Galectin-1在30例口腔鳞癌患者的癌组织及癌旁组织中mRNA和蛋白质表达水平,其表达水平与临床病理指标之间的关系采用SPSS10.0软件包进行统计分析。结果:口腔鳞癌组织中Galectin-1 mRNA和蛋白质表达水平均显著高于癌旁组织(P<0.01)。Galectin-1的表达水平与烟酒嗜好、肿瘤大小、淋巴结转移、临床分期、病理分化程度无显著相关性。结论:在口腔鳞癌组织中Galectin-1 mRNA和蛋白质表达上升,可能与肿瘤的发生、发展有关。     

口腔鳞状细胞癌中细胞核吸光度值变化与P53表达的相关性

目的:研究口腔鳞状细胞癌细胞核吸光度值与P53表达之间的相关性。方法:应用计算机辅助高清晰图像分析处理技术、免疫组织化学方法对45例典型病例和10例癌旁正常组织进行细胞核吸光度测量及P53检测,并进行统计学评价。结果:核平均吸光度、核积分吸光度、P53在正常黏膜、异常增生以及高、中、低分化鳞癌各组别间均有显著差异(P<0.001);P53表达与核平均吸光度呈负相关关系(r=-0.868,P<0.01),与核积分吸光度呈正相关关系(r=0.856,P<0.01)。结论:细胞核的吸光度值与P53表达呈关联关系,可以作为口腔鳞状细胞癌诊断有参考意义的指标。     

Shifts in cellular localization of moesin in normal oral epithelium, oral epithelial dysplasia, verrucous carcinoma and oral squamous cell carcinoma

BACKGROUND: Moesin, a member of ERM (ezrin/radixin/moesin) family, links actin filaments of cell surface structure to the cell membrane. The purpose of the study is to assess the shifts in cellular distribution of moesin in normal oral epithelium, oral epithelial dysplasia (OED), verrucous carcinoma (VC), and oral squamous cell carcinoma (OSCC). METHODS: The expression of moesin was evaluated immunohistochemically in paraffin-embedded tissues of 59 specimens of OSCC, 35 specimens of OED, 17 specimens of VC, and five specimens of normal oral epithelium. RESULTS: In the normal oral epithelia, all specimens showed a pattern of membranous expression against the anti-moesin antibody in the basal layer cells. In the OED specimens, moesin was dominantly expressed in the cell membrane except for the cornified layer. In VC and OSCC specimens, almost the whole of the carcinoma cells were stained with anti-moesin antibody. However, in OSCC samples, moesin was markedly expressed increasingly in the cytoplasm and decreasingly in the cell membrane, as compared with OED and VC. In addition, there was a significant correlation between the pattern of moesin expression and tumor differentiation in OSCC. CONCLUSIONS: Our results suggest that it is useful to detect the moesin expression as adjunct to screening mucosal lesions in the oral cavity.     

转录因子XBP1在口腔鳞状细胞癌中的表达

目的:检测口腔鳞状细胞癌(oral squamous cell carcinoma,OSCC)组织中X盒结合蛋白1 (X box binding protein 1,XBP1)的表达,并探讨其意义。方法:应用qRT-PCR法检测50例OSCC肿瘤和癌旁正常黏膜上皮中剪切型XBP1(XBP1 splicing, XBP1-s)的表达;应用组织芯片技术和免疫组化染色相结合的方法检测100例OSCC癌旁上皮、肿瘤中心、侵袭前沿及淋巴结转移灶中XBP1蛋白的表达。结果:qRT-PCR显示:XBP1-s mRNA表达显著上升(log2(倍数)≥1)的病例与颈淋巴结转移相关(P＜0.05)。免疫组化结果显示:XBP1蛋白在OSCC侵袭前沿和淋巴结转移灶中的表达均高于癌旁上皮和肿瘤中心(P＜0.05);且在淋巴结转移灶中的表达明显高于侵袭前沿(P＜0.05)。此外,XBP1蛋白表达还与OSCC组织病理学分级相关(P＜0.05)。结论:XBP1可能是促进口腔鳞状细胞癌侵袭和转移的一个重要因子。     

Promoter hypermethylation of mismatch repair genes, hMLH1 and hMSH2 in oral squamous cell carcinoma

Objectives:  Major risk factors of oral squamous cell carcinoma (OSCC) are environmental and can lead to DNA mutagenesis. Mismatch repair (MMR) system functions to repair small DNA lesions, which can be targeted for promoter hypermethylation. We therefore wanted to test whether hypermethylation of MMR genes ( hMLH1, hMSH2 ) could contribute to oral carcinogenesis by correlating the information to patient clinical data.
Methods:  Genomic DNA was extracted from 28 OSCC and six normal oral epithelium samples. The methylation status of the two MMR genes was assessed using Methylation Specific PCR after DNA modification with sodium bisulfite. Serial sections of the same tissues were immunostained with antibodies against hMLH1 and hMSH2 protein.
Results:  Promoter hypermethylation was observed in 14/28 OSCC cases. Remarkably, 100% of patients with multiple oral malignancies showed hypermethylation in hMLH1 or hMSH2 compared with 31.5% of single tumor patients. In 10 cancer cases, expression of the hMLH1 and hMSH2 genes by immunostaining showed reduced or absence of expression of one of the genes, although some did not reflect the methylation status.
Conclusions:  Hypermethylation of hMLH1 and hMSH2 might play a role in oral carcinogenesis and may be correlated with a tendency to develop multiple oral malignancies.     

肿瘤转移抑制基因nm_(23)-H_1在口腔粘膜鳞癌和癌前病变中的表达及意义

目的 :通过观察肿瘤转移抑制基因nm2 3 -H1在正常口腔粘膜 (NM)、口腔粘膜白斑 (LK)及口腔粘膜鳞癌 (OSCC)中的不同表达 ,分析其在OSCC及其癌变过程中的表达规律 ,探讨其与肿瘤的分化、浸润和转移的关系。方法 :采用免疫组织化学SP法检测nm2 3 -H1在 8例NM、12例LK及 5 8例OSCC中的不同表达 ,用x2 检验Fisher精确概率法对检测结果进行统计学分析。结果 :nm2 3 -H1在NM及LK中多数为高染 ,分别占 87 2 5 %和 83 3% ,而在OSCC中低染率为 5 6 90 % ,与前两者相比存在着显著差异 (p<0 0 5 ) ;nm2 3 H1的异常表达与肿瘤的分化程度及有无颈淋巴结转移 ,都存在显著相关性 (p <0 0 5 )。结论 :nm2 3 -H1蛋白表达水平是判断肿瘤有无颈淋巴结转移及其分化程度的参考指标。     

Rab38在口腔鳞癌中的表达及临床意义

目的:探讨Rab38在口腔鳞状细胞癌中的表达及其临床意义。方法:采用qRT-PCR法检测60对口腔鳞癌及配对癌旁正常组织中Rab38 mRNA的表达,采用免疫组织化学方法检测149例口腔鳞癌中Rab38蛋白的表达情况,分析Rab38的表达与口腔鳞癌患者临床病理特征及预后的关系。结果:口腔鳞癌组织中的Rab38的mRNA和蛋白表达水平都高于配对癌旁正常组织;Rab38表达与TNM分期和淋巴结转移有关;Rab38高表达的患者总生存时间少于Rab38低表达患者;Rab38表达水平是影响患者总生存率的独立危险因素。结论:Rab38在口腔鳞癌中高表达与患者不良预后关系密切,Rab38可能与口腔鳞癌的发生、发展有关,并可作为判断患者预后的指标。     

口腔黏膜癌变过程中丝氨酸/苏氨酸激酶15的表达及意义

目的了解丝氨酸/苏氨酸激酶15（STK15）在口腔黏膜癌变过程中的表达变化,探讨P53/STK15转激活-非依赖通路在口腔鳞癌（OSCC）发生发展中的作用及意义。方法正常口腔黏膜8例,上皮异常增生患者27例,OSCC患者43例, 石蜡包埋组织,采用免疫组化SABC法了解STK15及P53蛋白表达情况,分析二者的相关性及其临床病理学意义。结果STK15在正常口腔黏膜无表达,在上皮异常增生及OSCC中阳性率分别为40.74%（11/27） 和67.44%（29/43）,各组间差异均有统计学意义（P<0.05）;口腔鳞癌中STK15阳性率在P53阳性组高于P53阴性组,在OSCC有淋巴结转移组高于无淋巴结转移组,差异均有统计学意义（P<0.05）。结论STK15过表达是口腔黏膜癌变过程的早期事件,口腔鳞癌STK15过表达可能与p53突变有关并与OSCC淋巴结转移密切相关,P53/STK15转激活-非依赖通路在OSCC发生发展中可能起重要作用。     

Hypoxia inducible factor‐1α expression in areca quid chewing‐associated oral squamous cell carcinomas

Oral Diseases (2010) 16 , 696–701 Objectives: Hypoxia inducible factor (HIF)‐1α gene expression is mainly induced by tissue hypoxia. Overexpression of HIF‐1α has been demonstrated in a variety of cancers. The aim of this study was to compare HIF‐1α expression in normal human oral epithelium and areca quid chewing‐associated oral squamous cell carcinoma (OSCC) and further to explore the potential mechanisms that may lead to induce HIF‐1α expression. Methods: Twenty‐five OSCC from areca quid chewing‐associated OSCC and 10 normal oral tissue biopsy samples without areca quid chewing were analyzed by immunohistochemistry. The oral epithelial cell line GNM cells were challenged with arecoline, a major areca nut alkaloid, by using Western blot analysis. Furthermore, glutathione precursor N‐acetyl‐l ‐cysteine (NAC), AP‐1 inhibitor curcumin, extracellular signal‐regulated protein kinase inhibitor PD98059, and protein kinase C inhibitor staurosporine were added to find the possible regulatory mechanisms. Results: Hypoxia inducible factor‐1α expression was significantly higher in OSCC specimens than normal specimen (P < 0.05). Arecoline was found to elevate HIF‐1α expression in a dose‐ and time‐dependent manner (P < 0.05). The addition of NAC, curcumin, PD98059, and staurosporine markedly inhibited the arecoline‐induced HIF‐1α expression (P < 0.05). Conclusions: Hypoxia inducible factor‐1α expression is significantly upregulated in areca quid chewing‐associated OSCC and HIF‐1α expression induced by arecoline is downregulated by NAC, curcumin, PD98059, and staurosporine.     

HPV与Survivin在口腔上皮组织中致癌作用研究

目的:研究口腔鳞癌(OSCC)及口腔黏膜白斑(OLK)组织中HPV感染与Survivin的表达,探讨上皮组织肿瘤的形成机制。方法:应用原位杂交法和免疫组化染色法分别检测30例OSCC组织,20例OLK组织及20例正常口腔黏膜组织中HPV及Survivin的表达情况。结果:Survivin在OSCC中的表达高于OLK中的表达,具有统计学意义。HPV阴性的OSCC中Survivin的表达明显高于HPV阳性OSCC组织;HPV阳性的OLK中survivin的表达明显高于HPV阴性的OLK组织。结论:Survivin可能通过抑制细胞凋亡调节HPV对口腔上皮的致癌作用,HPV感染对Survivin的表达水平存在调节作用。