低氧激活HIF-1α诱导舌鳞癌细胞上皮-间质转化

目的：探讨低氧微环境诱导人舌鳞癌细胞上皮-间质转化以及HIF-1α在该过程中的作用。方法 体外常氧（20% O₂）或低氧（1% O₂）状态下培养舌鳞癌SCC9、CAL27细胞48 h,Western免疫印迹和实时定量PCR检测上皮间质标记蛋白vimentin、fibronectin和E-cadherin的表达变化和HIF-1α的表达水平,Transwell小室检测细胞的迁移能力。通过小干扰RNA（HIF-1α-Si）转染舌鳞癌细胞,检测HIF-1α、vimentin、fibronectin与E-cadherin蛋白表达以及细胞迁移能力的变化。应用SPSS13.0软件包对数据进行独立样本t检验。结果 人舌鳞癌细胞SCC9、CAL27在低氧环境中培养48 h后,间质标志蛋白vimentin和fibronectin在蛋白和mRNA水平均显著升高,上皮标志蛋白E-cadherin表达降低,HIF-1α表达上调,细胞迁移能力显著增强。小干扰RNA（siRNA）转染舌鳞癌细胞SCC9、CAL27并于低氧下培养后,HIF-1α表达显著降低,vimentin和fibronectin表达也显著降低,E-cadherin表达升高,细胞迁移能力显著下降。结论 低氧通过上调HIF-1α表达而促进人舌鳞癌细胞发生上皮-间质转化及转移。     

lncRNA-HOTTIP在低氧诱导舌鳞癌细胞上皮-间质转化过程中的作用探讨

目的 探讨lncRNA-HOTTIP在低氧诱导人舌鳞癌细胞上皮-间质转化过程中的作用。方法 体外正常氧（20% O₂）或低氧（1% O₂）状态下培养舌鳞癌SCC9、CAL27细胞48 h,实时定量PCR检测lncRNA-HOTTIP与HIF-1α的表达水平;通过小干扰RNA（Si-HIF1α）转染舌鳞癌细胞,检测HIF-1α敲低后lncRNA-HOTTIP的表达变化;进一步通过小干扰RNA（Si-HOTTIP）转染舌鳞癌细胞,验证敲低lncRNA-HOTTIP后E-cadherin、Fibronectin与Vimentin的蛋白和mRNA水平,以及细胞迁移能力的变化。采用SPSS13.0软件包对数据进行统计学分析。结果 人舌鳞癌细胞SCC9、CAL27在低氧培养48 h后,lncRNA-HOTTIP与HIF-1α均显著升高;Si-HIF1α转染SCC9、CAL27并于低氧培养后,HIF-1α水平显著降低,lncRNA-HOTTIP表达下降。Si-HOTTIP转染SCC9、CAL27并在低氧培养后,lncRNA-HOTTIP水平降低,间质标志蛋白Vimentin和Fibronectin在蛋白和mRNA水平显著降低,上皮标志蛋白E-cadherin表达升高,细胞迁移能力显著降低。结论 低氧可通过上调HIF-1α并激活lncRNA-HOTTIP表达,进而促进人舌鳞癌细胞发生上皮-间质转化及转移。     

MMP-9抑制剂对口腔鳞癌细胞增殖和侵袭能力的影响

目的 观察MMP-9抑制剂对人口腔鳞癌细胞系CAL27增殖和侵袭能力的影响。方法 选取人口腔鳞癌细胞系CAL27进行培养,用不同浓度的MMP-9抑制剂BB-94处理对数期CAL27细胞,通过RT-PCR检测BB-94在基因水平上对MMP-9的抑制效果。细胞免疫化学实验检测BB-94在蛋白水平上对MMP-9的抑制效果。MTT实验检测MMP-9抑制剂BB-94对人口腔鳞癌细胞增殖能力的影响。划痕实验检测MMP-9抑制剂BB-94对人口腔鳞癌细胞迁移能力的影响;Transwell实验检测MMP-9抑制剂BB-94对人口腔鳞癌细胞侵袭能力的影响。结果 MMP-9抑制剂能有效抑制人口腔鳞癌细胞CAL27的增殖、迁移和侵袭能力。结论 抑制MMP-9的表达可以抑制人口腔鳞癌细胞CAL27的增殖、迁移和侵袭等恶性生物学行为。     

天然抗ABCC3 IgG抗体对口腔鳞癌细胞增殖的影响

目的探讨天然抗ABCC3 IgG抗体对口腔鳞癌细胞CAL27和SCC15的影响。方法采用ELISA方法筛查富含天然抗ABCC3 IgG抗体的阳性血浆为实验组,低含天然抗ABCC3 IgG抗体的阴性血浆为对照组。采用qRT-PCR检测ABCC3基因的mRNA表达水平。CCK-8实验和流式细胞术检测天然抗ABCC3 IgG抗体对CAL27和SCC15细胞的增殖、凋亡和细胞周期的影响。结果在CAL27和SCC15细胞中均有ABCC3基因的表达。与阴性对照血浆相比较,富含ABCC3 IgG抗体的阳性血浆可以明显抑制CAL27细胞的增殖(P<0.01),促进CAL27细胞的凋亡(P<0.01),并对CAL27细胞周期中的G2/M期产生阻滞作用(P<0.01),但对SCC15细胞无明显影响。结论天然抗ABCC3 IgG抗体对口腔鳞癌细胞的增殖有抑制作用,可能成为治疗口腔鳞癌的一种有前景的新药物。     

环状RNA hsa_circ_0002203对口腔鳞状细胞癌 细胞增殖、迁移、侵袭和凋亡能力的影响

目的 探讨环状RNA hsa_circ_0002203对口腔鳞状细胞癌（OSCC）细胞系恶性生物学行为的影响。方法 纳入OSCC患者40例,使用实时荧光聚合酶链反应检测环状RNA hsa_circ_0002203在OSCC组织、癌旁组织、OSCC细胞系和人口腔黏膜角质形成细胞（HOK）中的表达水平。慢病毒感染SCC15和CAL27细胞,实时荧光聚合酶链反应检测环状RNA hsa_circ_0002203的表达,细胞计数（CCK-8）实验检测细胞增殖能力,划痕实验和Transwell迁移及侵袭实验检测细胞迁移侵袭能力,流式细胞凋亡实验检测细胞凋亡水平,蛋白质印迹法检测细胞增殖凋亡侵袭相关蛋白的表达。通过裸鼠成瘤实验观察hsa_circ_0002203对SCC15细胞体外成瘤能力的影响。结果 环状RNA hsa_ circ_0002203在OSCC组织的表达低于癌旁组织（P<0.01）,在OSCC细胞系中的表达低于人类角质形成细胞（P< 0.001）。慢病毒感染SCC15和CAL27细胞后hsa_circ_0002203的表达增加;SCC15和CAL27细胞的增殖、迁移和侵袭能力下降,凋亡水平增加;裸鼠肿瘤体积、质量减小,生长速度降低。结论 环状RNA hsa_circ_ 0002203在口腔鳞状细胞癌中的低表达可以增强肿瘤细胞的增殖、迁移和侵袭能力,抑制肿瘤细胞凋亡。     

环状RNA hsa_circ_0002203对口腔鳞状细胞癌细胞增殖、迁移、侵袭和凋亡能力的影响

目的 探讨环状RNA hsa_circ_0002203对口腔鳞状细胞癌（OSCC）细胞系恶性生物学行为的影响。方法 纳入OSCC患者40例,使用实时荧光聚合酶链反应检测环状RNA hsa_circ_0002203在OSCC组织、癌旁组织、OSCC细胞系和人口腔黏膜角质形成细胞（HOK）中的表达水平。慢病毒感染SCC15和CAL27细胞,实时荧光聚合酶链反应检测环状RNA hsa_circ_0002203的表达,细胞计数（CCK-8）实验检测细胞增殖能力,划痕实验和Transwell迁移及侵袭实验检测细胞迁移侵袭能力,流式细胞凋亡实验检测细胞凋亡水平,蛋白质印迹法检测细胞增殖凋亡侵袭相关蛋白的表达。通过裸鼠成瘤实验观察hsa_circ_0002203对SCC15细胞体外成瘤能力的影响。结果 环状RNA hsa_ circ_0002203在OSCC组织的表达低于癌旁组织（P<0.01）,在OSCC细胞系中的表达低于人类角质形成细胞（P< 0.001）。慢病毒感染SCC15和CAL27细胞后hsa_circ_0002203的表达增加;SCC15和CAL27细胞的增殖、迁移和侵袭能力下降,凋亡水平增加;裸鼠肿瘤体积、质量减小,生长速度降低。结论 环状RNA hsa_circ_ 0002203在口腔鳞状细胞癌中的低表达可以增强肿瘤细胞的增殖、迁移和侵袭能力,抑制肿瘤细胞凋亡。     

姜黄素联合紫杉醇对人口腔鳞癌细胞的增殖抑制及凋亡诱导作用

目的:探讨姜黄素和紫杉醇对人口腔鳞癌细胞系CAL27的增殖和凋亡的影响.方法:培养人口腔鳞癌细胞系CAL27,采用不同浓度的姜黄素和紫杉醇及联合用药处理细胞24 h、48 h及72 h.MTT法检测对细胞增殖的影响,Tunel法检测对细胞凋亡的影响,Western印迹法检测对凋亡相关蛋白Bcl-2、Bax和活性caspase-3表达的影响.采用SPSS11.0软件包对数据进行统计学分析.结果:相对于姜黄素或紫杉醇对CAL27的单独作用,两者联合用药能更显著地抑制CAL27细胞增殖和促进CAL27细胞凋亡,更显著地下调Bcl-2表达和Bcl-2/Bax表达比例,上调Bax和活性caspase-3的表达.结论:相比于单一用药,姜黄素和紫杉醇联合用药对CAL27有更好的增殖抑制和凋亡诱导作用.     

莱菔硫烷对RhoC敲低的口腔鳞癌细胞的调控作用

目的 观察莱菔硫烷（sulforaphane,SFN）对RhoC稳定敲低的口腔鳞癌细胞系CAL27 RhoC/shRNA的影响。方法 选取口腔鳞癌细胞系CAL27 RhoC/shRNA进行培养，用不同浓度的SFN处理对数期CAL27RhoC/shRNA细胞，通过RT-PCR和western blot检测SFN对细胞中Nrf2 RNA和蛋白水平的影响。分别通过MTT实验、克隆形成实验和侵袭实验检测SFN对口腔鳞癌细胞增殖能力、克隆形成能力和侵袭能力的影响；PHOD染色检测SFN对口腔鳞癌细胞F-actin聚合能力的影响。结果 应用SFN能有效抑制口腔鳞癌细胞CAL27 RhoC/shRNA的增殖能力、克隆形成能力、侵袭能力和F-actin蛋白聚合能力。结论 SFN可减弱RhoC敲低的口腔鳞癌细胞的恶性能力。     

二甲双胍对口腔鳞癌细胞迁移的体外作用研究

目的:从体外细胞水平研究二甲双胍对口腔鳞癌细胞迁移能力的影响，并初步探讨可能的机制和潜在价值。方法:复苏培养口腔鳞癌细胞系SCC4和CAL27,选用含不同浓度(0、2、5、10、20 mmol/L)二甲双胍培养基处理培养SCC4和CAL27细胞，CCK-8法测定细胞活性。选定二甲双胍低细胞毒性浓度后采用细胞平板克隆、细胞划痕实验测定细胞增殖和迁移能力，明胶酶谱法测定口腔鳞癌细胞的细胞基质金属蛋白酶-2/9(matrix metalloproteinase-2/9,MMP-2/9)的外分泌能力，免疫印迹法对口腔鳞癌细胞内与上皮-间充质转化(epithelial mesenchymal transition, EMT)相关的蛋白表达情况进行测定。结果:低细胞毒性浓度的二甲双胍对口腔鳞癌细胞体外增殖和迁移有显著抑制作用(P<0.05)。二甲双胍能够显著抑制口腔鳞癌细胞的外分泌MMP-2/9的能力(P<0.05)。二甲双胍能显著调控口腔癌细胞中EMT相关通路标志蛋白的表达(P<0.05),抑制其信号转导。结论:二甲双胍可通过下调MMP-2/9外分泌和调控EMT相关信号转导抑制...     

KLF4对口腔鳞癌细胞增殖的抑制作用

目的 探讨KLF4对人口腔鳞癌细胞CAL27的增殖抑制作用.方法 构建KLF4慢病毒表达载体,并转染人口腔鳞癌细胞系CAL27,转染不含KLF4开放读码框的慢病毒载体LV105作为对照.采用RT-PCR、免疫细胞化学法对KLF4表达进行鉴定.MTT实验、流式细胞术检测KLF4对口腔鳞癌细胞系CAL27的增殖抑制作用.结果 RT-PCR、免疫细胞化学实验均表明实验组细胞KLF4的表达明显高于对照组(P＜0.01).MTT实验结果表明与对照组CAL27/LV105组相比,CAL27/KLF4能够抑制细胞的增殖能力(P＜0.01).CAL27/KLF4主要通过使细胞周期中的G2/M期阻滞来抑制CAL27细胞的增殖(P＜0.01).结论 KLF4转染能够抑制口腔鳞癌细胞系CAL27的增殖能力,可能在口腔鳞状细胞癌中作为抑癌基因发挥作用.     

Inhibition of the migration, attachment, spreading, growth and collagen synthesis of human gingival fibroblasts by arecoline, a major areca alkaloid, in vitro

Because betel quid (BQ) chewing has been linked to a higher prevalence of periodontal diseases, the pathobiological effects of arecoline, a main alkaloid found in areca nut, were investigated in cultured human gingival fibroblasts. At concentrations higher than 0.4 mM, arecoline inhibits cell attachment, cell spreading and cell migration in a dose-dependent manner. These inhibitory effects were associated with intracellular depletion of glutathione (GSH). At concentrations of 0.4 mM and 1 mM. arecoline depleted about 26% and 45% of GSH after 2 h incubation. Exposure of cells to areeoline at concentrations lower than 0.4 mM for 2 h showed no significant decrease in either cell viability or intracellular GSH. However, incubation of cells for 24 h in 1 mM arecoline decreased the cell numbers to only 35% of those in the untreated control. Arecoline also decreased cell growth and collagen synthesis in a dose-dependent manner. Because of repeated and long-term exposure to arecoline. BQ chewers could be more susceptible to periodontal damage and less responsive to new attachment procedures.     

人牙髓干细胞的体外分离、培养及鉴定

目的 :体外分离、培养人牙髓干细胞 ,从不同角度对其进行鉴定。方法 :采用胶原酶和Dispase酶联合消化法培养人牙髓干细胞 ,有限稀释法分离纯化 ,将克隆形成的细胞通过透射电镜观察其超微结构、流式细胞仪细胞周期分析及抗波形丝蛋白 (Vimentin)、CD44、骨粘素 (ON)、牙本质涎蛋白 (DSP)免疫组化染色方法进行鉴定。结果 :通过有限稀释法获得了人牙髓干细胞克隆 ,透射电镜下观察这种克隆形成细胞具有干细胞典型的超微结构特点 ,大多数细胞处于G0 /G1期 ,为细胞周期的静止期 ,并具有牙源性未分化间充质细胞的表型特点。结论 :克隆化培养是人牙髓干细胞较为有效的分离纯化方法 ,该方法分离的人牙髓干细胞具有干细胞的结构、细胞周期及表型特点。     

Evaluation of p53, PCNA, Ki-67, MDM2 and AgNOR in oral peripheral and central giant cell lesions

OBJECTIVES: Peripheral giant cell lesion (PGCL) and central giant cell lesion (CGCL) of the jaws have a distinct clinical behaviour. Whether such biological differences are supported by a distinct pattern of proliferation markers or cell cycle associated proteins expression is not known. Therefore the purpose of the present study was to compare the immunohistochemical expression of p53, MDM2, Ki-67, PCNA and the histochemical expression of argyrophilic nuclear organiser region (AgNOR) on PGCL and CGCL of the jaws. MATERIALS AND METHODS: Paraffin wax blocks of 14 cases of PGCL and 12 cases of CGCL were retrieved. A biotin-streptavidin amplified system was used for identification of the antigens. The AgNOR number was also evaluated. RESULTS: Ki-67 immunoreactivity was greater in the mononuclear cells of PGCL compared to CGCL. PCNA and AgNOR staining were similar in PGCL and CGCL. Prominent MDM2 immunoreactivity was observed in all tissues investigated. By contrast, there was no p53 immunoreactivity. CONCLUSIONS: Although CGCL present a more aggressive clinical behaviour, it has a decreased proliferative activity compared to PGCL. Finally, p53, MDM2, PCNA, Ki-67 immunohistochemical expression and AgNOR histochemical expression do not reflect their distinct biological behaviour.     

人脂肪基质细胞的分离、培养、增殖及传代稳定性

目的:建立人脂肪基质细胞分离、培养及扩增的方法,观察其增殖动力学行为,检测其传代稳定性。方法:通过吸脂术获取人的脂肪组织并分离脂肪基质细胞,在普通培养基中进行培养,观察细胞形态,绘制细胞增殖曲线,用油红O染色显示胞内脂滴生成,并检测其是否向脂肪细胞自动分化。结果:人的脂肪组织中可分离出基质细胞,在体外生长形态类似成纤维细胞;其增殖曲线呈S形。在原代及传代培养中均未见脂肪细胞或胞内脂滴生成。结论:成年人脂肪组织中存在的基质细胞可维持在未分化状态下稳定的增殖和传代。     

Immunohistochemical expression of p53, MDM2, Ki-67 and PCNA in central giant cell granuloma and giant cell tumor

Central gaint cell granuloma (CGCG) is a reactive bone lesion that occurs mainly in the jaws. The gaint cell tumour (GCT) is a benign locally aggressive neoplasm located near the articular end of tubular bones. Both lesions are characterised histologically by multinucleated gaint cells in a background of ovoid to spindle-shaped mesenchymal cells. There is a basic question whether both lesions are separate entities or variants of the same disease. The study of cell cycle-associated proteins may give insights into clarifing such question. The expression of these protiens is also important to determine the cell cycle regulation in both tumours. The purpose of this study was to evaluate the immunohistochimical expression of p53, MDM2, Ki-67 and PCNA in CGCG and GCT. The results demonstrated that, despite the lack of p53 immunoreactivity, all the samples showed wide expression of MDM2. The percentage of Ki-67-and PCNA-positive cell in CGCG was statistically higher than that of GCT. Our findings shwo that CGCG has a higher proliferative activity compared with that of the GCT. Our results also suggest that p53 inactivation by MDM2 expression may be involved in the pathogenesis of gaint cell lesions of the jaws and long bones.     

Butyrate,a bacterial metabolite,induces apoptosis and autophagic cell death in gingival epithelial cells

Tsuda H, Ochiai K, Suzuki N, Otsuka K. Butyrate, a bacterial metabolite, induces apoptosis and autophagic cell death in gingival epithelial cells. J Periodont Res 2010; 45: 626–634.©2010 John Wiley & Sons A/S Background and Objective: Butyrate is produced by some types of anaerobic periodontal bacteria. Millimolar concentrations of butyrate are found in mature dental plaque from periodontitis patients. Although butyrate reportedly has a variety of effects in many mammalian cells, its effect on gingival epithelial cells is not well known. In this study, we investigated the effect of butyrate on gingival epithelial Ca9‐22 cell death. Material and Methods: Death of Ca9‐22 cells was assessed after treating the cells with or without butyrate. A SYTOX Green dye, which exhibits strong green fluorescence once it enters dead cells through ruptured cell membranes, was used for cell death detection. Phosphatidylserine redistribution was measured using fluorescein isothiocyanate‐labeled annexin V. The activity of caspase‐3 was measured as the amount of cleaved substrate peptide. Anti‐apoptotic bcl‐2 mRNA expression was measured using real‐time RT‐PCR. Western blotting and fluoromicroscopic analysis with anti‐microtubule‐associated protein 1 light chain 3 (LC3) antibodies were performed for detection of autophagy. Results: Stimulation with millimolar concentrations of butyrate for 48 h induced Ca9‐22 cell death. The stimulation also caused increased caspase‐3 activity, phosphatidylserine redistribution and bcl‐2 down‐regulation, suggesting butyrate‐induced apoptosis. However, the pan‐caspase inhibitor, Z‐VAD‐FMK, did not inhibit cell death completely. This implies the existence of other types of cell death. In addition, markers of autophagy, namely, the conversion of LC3‐I to LC3‐II and increased LC3 accumulation, were observed. Moreover, inhibition of autophagy by 3‐methyladenine suppressed the butyrate‐induced cell death, suggesting that butyrate could induce cell death through autophagy. Conclusion: These data suggest that butyrate induces apoptosis and autophagic cell death.     

舌鳞癌预后与细胞增殖和凋亡的关系

目的：探讨舌鳞癌预后与细胞增殖和凋亡的关系。方法：采用TUNEL法和免疫组织化学法检测52例舌鳞癌细胞中自发性凋亡水平及Bax、Bcl-2、增殖细胞核抗原（proliferating cell nuclea antigen,PCNA)的表达，及其与预后的关系。结果：舌鳞癌中凋亡指数（apoptosis index,AI)、Bcl-2、Bax和PCNA表达的阳性率分别为55．8％、65．4％、73．1％和100．0％。单因素生存分析显示：舌癌患者生存率降低与Bax低表达（P＝0．0020）、PCNA高表达（P＝0．0179）、Bcl-2/Bax比值＞1（P＝0．0072）和高TNM分期（P＝0．0351）有关，但与Bcl-2表达和凋亡指数无关（P＝0．885，P＝0．3536）。结论：Bax、PCNA、Bcl-2/Bax比值和TNM分期一样具有预后价值，综合分析这些指标有助于识别舌癌的生物学特性并准确判断患者的预后。