胰腺癌血清相关蛋白质分子的差异表达

目的 利用双向差异凝胶电泳(2D-DIGE)的方法建立胰腺癌、慢性胰腺炎和正常对照人群外周血清的差异蛋白质双向凝胶电泳图谱并分析差异蛋白质点.方法 双向差异凝胶电泳分离20例胰腺癌患者、10例慢性胰腺炎患者和20例正常对照组人群外周血清蛋白,比较不同血清中蛋白质表达的差异.结果 成功建立胰腺癌、慢性胰腺炎和正常人之间的外周血清蛋白质双向差异凝胶电泳图谱,软件分析共发现了168个明显差异表达的蛋白质点,其中在胰腺癌组与正常对照组的比较中有22个蛋白质点在胰腺癌血清中表达上调,29个蛋白质点下调;在胰腺癌组和慢性胰腺炎组的比较中有24个蛋白质点在胰腺癌血清中表达上调,54个表达下调;在慢性胰腺炎组和正常对照组的比较中有20个蛋白质点表达上调,19个蛋白质点表达下调.结论 双向差异凝胶电泳是快速有效的分离蛋白质新的方法,得到的双向差异凝胶电泳图谱以及显著表达差异的蛋白质点为质谱鉴定提供了实验基础.

Abstract：

Objective To analyze and compare the proteomes expressed by human pancreatic carcinoma, chronic pancreatitis and normal control groups. Methods Differencial expression of the proteomes in peripheral serum was analyzed by fluorescence 2-D difference gel electrophoresis (2D-DIGE). Results 2D-DIGE protein maps in 20 patients with pancreatic cancer, 10 patients with chronic pancreatitis and 20 normal controls were analyzed and 168 spots were identified by gel-analysis software. Between pancreatic cancer group and normal control group 22 protein spots were up-regulated and 29 spots down-regulated; 24 spots were up-regulated and 54 spots down-expressed between pancreatic cancer group and chronic pancreatitis group; 20 spots were up-regulated and 19 spots down-regulated between chronic pancreatitis group and normal control group. Conclusion 2D-DIGE was a rapid and efficient method to separate proteins. 2D-DIGE protein maps and different protein spots would provide an exprimental basis for the phase of mass spectrometry.     

瘢痕疙瘩与正常皮肤的蛋白质组学研究

目的 通过比较瘢痕疙瘩与正常皮肤组织的蛋白质组表达差异,筛选出与瘢痕疙瘩产生相关的蛋白质.方法 2010年1月至6月运用蛋白质组学技术,对8例瘢痕疙瘩组织和3例正常皮肤组织进行差异双向凝胶电泳(2D-DIGE),选择差异蛋白质斑点,进行基质辅助激光解离飞行时间(MALDI-TOF/TOF)质谱分析和生物学信息分析.结果 成功建立瘢痕疙瘩和正常皮肤组织的双向凝胶电泳图谱,瘢痕疙瘩和正常皮肤组织凝胶电泳图谱中平均蛋白质斑点数分别为2978和3053,其中表达差异超过4倍的斑点共有40个,质谱分析和数据库检索共鉴定出32种蛋白质,包括上调蛋白有20种,下调蛋白有12种.从功能上可分为载体蛋白(3种)、信号转导蛋白(4种)、增殖凋亡相关蛋白(2种)、细胞骨架蛋白(6种)、细胞外基质蛋白(8种)、免疫因子(3种)、肿瘤相关蛋白(2种)和未知功能蛋白(4种).结论 蛋白质组学能较好地显示瘢痕疙瘩与正常皮肤组织间的蛋白质表达差异.对这些差异蛋白质进一步深入研究,将有助于揭示瘢痕疙瘩的发病机制,也为发现新的治疗靶点提供线索和依据.

Abstract：

Objective To investigate and search correlative proteins of keloid by comparing the results of differential proteomic analysis between keloid and normal skin. Methods From January 2010 to June 2010 two-dimensional gel electrophoresis was used to define patterns of protein expression in keloid skin from 8 patients and matched normal skin from 3 patients. Differential expression protein spots were showed and analyzed by matrix-assisted laser desorption ionization-time of flying/time of flying(MALDI-TOF/TOF) mass spectrometry. Results This study succeeded to provide a two-dimensional protein profiling comparison between normal skin and keloid. Gel-analysis software identified an average of 2978 spots in keloid while 30S3 spots in normal skin and statistical filtering yielded 40 spots of a 4-fold change, 32 of which were identified by using mass spectrometry, 20 were up-regulated and 12 were down-regulated. Functional analysis revealed that these proteins could be fractionated to carrier proteins (3 proteins), signal transduction proteins (4 proteins) , proliferation and apoptosis related proteins (2 proteins) , cytoskeleton proteins(6 proteins) , extracellular matrix proteins(8 proteins) , immunity related proteins (3 proteins) , tumor related proteins (2 proteins) , and function unknown protein (4 proteins). Conclusions Proteomic analysis can identify the proteins with variance of keloid versus normal skin. The further research to these differential proteins may help reveal the pathogenesis of keloid and provide new treatments for keloid.     

矢车菊素-3-葡萄糖苷对胃癌细胞侵袭转移的影响

目的 观察矢车菊素-3-葡萄糖苷(C3G)对人胃癌细胞株MGC803和SGC7901增殖、迁移和侵袭运动能力的影响,并初步探讨其可能的机制.方法 用C3G处理人胃癌MGC803和SGC7901细胞株,用MTF比色法检测C3G对该细胞系增殖的抑制作用,Transwe1l小室进行迁移实验和人工重组基底膜侵袭实验.用RT-PCR及Western blot方法检测用药前后肿瘤细胞中基质金属蛋白酶2(MMP-2)基因和蛋白的表达水平.结果 C3G在体外明显抑制人胃癌MGC803和SGC7901细胞的增殖,且呈浓度、时间依赖性(P＜0.01),MGC803 24 hIC50=6.27μg/ml,SCC7901 24 h IC50=5.42 μg/ml.经C3G处理后,MGC803和SGC7901细胞迁移、侵袭能力明显降低(P＜0.01),MGC803和SGC7901阴性对照组24 h侵袭细胞数分别为(207±9)个和(115±9)个,C3G 10 μg/ml组侵袭细胞数则分别减少至(24±5)个和(14±6)个.MMP-2基因和蛋白表达水平显著下降(P＜0.01),且呈现浓度依赖性.结论 C3G具有体外抗胃癌细胞增殖的作用,且可能通过抑制肿瘤细胞的迁移和侵袭运动能力来发挥预防肿瘤侵袭的作用,其机制可能与抑制MMP-2的生成有关.

Abstract：

Objective To investigate the effect of cyanidin-3-glucoside extracted from Chinese bayberry on the proliferation. migration and invasion ability of the gastric cancer cell lines MGC803 and SGC7901 in vitro, and explore the possible mechanism of the preventive effects of C3G on tumor metastasis.Methods After treatment by C3G, the growth inhibiting of C3G on MGC803 and SGC7901 was determined by MTF assay, cell migration and invasion ability was evaluated with transwell chamber. Expression of Matrix metalloproteinase 2( MMP-2 )mRNA and protion on cells were analyzed by RT-PCR and Western blot.Results C3G significantly inhibited the proliferation of MGC803 and SGC7901 cells in a concentration and time-dependent manner as measured by MTT method ( P ＜0. 01 ), and the IC50 were: MGC803:24 h IC50 =6. 27 μg/ml;SGC7901:24 h IC50 = 5.42 μg/ml. After the cells were treated with C3G, the migration and invasion ability of MGC803 and SGC7901 cells decreased significantly ( P ＜ 0. 01 ) the number of invasive cells in 24 hours of the negative control MGC803, SGC7901 group was ( 207 ± 9 ) and ( 115 ± 9 ),respectively, while in C3G 10 μg/ml group the number of invasive cells decreased to( 24 ± 5 ) , ( 14 ± 6). In addition, the expression of MMP-2 mRNA and protion decreased abviously ( P ＜ 0. 01 ), all that was in a concentration-dependent manner. Conclusions In vitro, C3G has a concentration- and time-dependent growth inhibiting effect on MGC803 and SGC7901 cells, and may prevent metastasis by affecting migration and invasion ability of tumor cells. This action may be mediated by down-regulation of MMP-2mRNA and protein.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

靶向性蛋白激酶B1和环氧合酶-2 shRNA腺病毒载体的构建和在人胃癌细胞的表达

Objective To construct a short hairpin RNA (shRNA) adenovirus vector targeting protein kinase BI (PKB1/Akt1) and cyclooxygenase-2 (COX-2) and observe their expression in human gastric carcinoma cell line SGC-7901. Methods Akt1 and COX-2 shRNA expression frames were sub-cloned to pGSadeno adenovirus vector by homologous recombination technology to construct pGSadeno-Aktl + COX-2 ( pGSadeno-A + C) vector. Furthermore after screening and amplification,recombinant ade-novirus vector was digested with Pacl and transfected into HEK293 cells. The replication adenovirus rAd5-A + C was packed and amplified in the HEK293 cells, and its titer was detected. After human SGC-7901 cells in vitro were transfected by rAd5-A + C,Akt1 and COX-2 mRNA and protein expression levels were detected by real-time PCR and Western blot respectively. Compared with rAdS-A + C,SGC-7901 and gen-eral rAd5-HK were selected as the negative controls. Results The recombinant adenovirus rAd5-A + C was constructed successfully and its titer reached 1.0 ×1010 pfu/ml. Aktl and COX-2 mRNA expression was downregulated significantly, and their ACt values ( 12.26±0.05 and 5.41±0.09 respectively ) were higher than rAd5-HK group (10.63±0.02 and 3.75 +0.08 respectively) and control group (10.57± 0.02 and 3.73±0.08 respectively) (P <0.01 ). There was no significant difference between rAd5-HK and control groups (P >0.05). Aktl and COX-2 protein expression was downregulated by 70.5% and 63.7% respectively ( P < 0.01 ) in rAd5-HK group as compared with control group ( P > 0.05 ). Conclu-sion The shRNA aclenovirus vector targeting Akt1 and COX-2 can specifically inhibit Akt1 and COX-2 expression,and this may be a new strategy in gastric carcinoma gene therapy targeting Akt1 and COX-2.     

抑制核转录因子κB活性对SGC7901/VCR细胞mdr1表达及凋亡的影响

目的 观察突变型IκBα抑制核转录因子κB(NF-κB)活性对耐药胃癌细胞株SGC7901/VCR中多药耐药基因1(mdr1)的表达及细胞凋亡的影响.方法 突变型IκBα真核表达重组体(pCMV4-mIκBα)经脂质体介导转染至SGC7901/VCR细胞中,凝胶迁移率实验(EMSA)检测SGC7901/VCR细胞核内NF-κB活性,逆转录-聚合酶链反应(RT-PCR)和Western blot检测细胞内mdr1的表达,荧光分光光度法检测罗丹明123(Rh123)的胞内聚集,流式细胞术检测细胞凋亡.结果 pCMV4-mIκBα瞬时转染人SGC7901/VCR细胞24 h后,可显著抑制NF-κB活性达64%,抑制mdr1的表达达75%,使Rh123在细胞内的聚集增加2.3倍.转染24 h后SGC7901/VCR细胞凋亡率为(14.15±1.52),与对照组(4.37±1.31)比较差异有统计学意义(P＜0.01).结论 突变型IκBα抑制NF-κB活性对耐药胃癌细胞株mdr1的表达有直接抑制作用,并促使耐药胃癌细胞凋亡.     

氨基末端激酶参与胃癌顺铂耐药机制的研究

目的 研究氨基末端激酶(p-JNK)参与胃癌SGC7901/DDP细胞株顺铂耐药的机制.方法 应用JNK通路抑制剂SP600125抑制p-JNK表达,通过四氮唑盐还原法(MTF)检测药物敏感性;流式细胞术分析细胞凋亡率;Western印迹检测p-JNK和耐药蛋白P-糖蛋白(Pglycoprotein,P-gp)在敏感株SGC7901和耐药株SGC7901/DDP中的表达变化.免疫组织化学方法检测含有168例胃癌和27例正常胃的组织芯片中p-JNK和P-gp的表达及分析其关系.结果 SP600125抑制p-JNK表达后,敏感株SGC7901和耐药株SGC7901/DDP的药物敏感性和细胞凋亡率增加(P＜0.01);耐药蛋白P-gP表达水平明显减低(0.21±0.01和0.77±0.05比0.06±0.01和0.52±0.06:P＜0.01).p-JNK和P-gp在胃癌组织中的表达分别为45.8%和51.8%,均显著高于正常胃组织中的7.4%和18.5%(P＜0.01).p-JNK和P-gp的表达呈正相关(P＜0.01).结论 p-JNK通过调节P-gp表达及抗凋亡信号通路参与胃癌顺铂耐药,可成为逆转耐药的新的靶点.     

电穿孔法和化学法在多药耐药胃癌细胞转染中的效果比较

目的:比较电穿孔法和化学法在多药耐药(MDR)胃癌细胞中转染效果。方法:将表达抑癌基因WTX的质粒分别用电穿孔法和两种化学法(Lipofectamine2000、Attractene)转染MDR胃癌SGC7901/VCR细胞,观察转染后细胞中增强型绿色荧光蛋白(e GFP)和目的基因WTX m RNA的表达情况。结果:e GFP分析结果显示,与无耐药的亲代SGC7901细胞比较,两种化学转染法对SGC7901/VCR细胞的转染效率明显降低(均P0.05),而电穿孔转染法未见明显降低(P0.05),且明显高于两种化学转染法对SGC7901/VCR细胞的转染效率(均P0.05)。RT-PCR结果显示,电穿孔转染的SGC7901/VCR细胞中WTX m RNA表达量明显高于两种化学法转染的SGC7901/VCR细胞中的WTX m RNA表达量(均P0.05)。结论:对于MDR胃癌细胞,电穿孔转染法不易受其细胞膜成分的影响,可以保持较好的转染效率。     

Dapper1在胃癌组织中的表达及其对survivin介导的细胞凋亡的调控

目的 研究Dapper1(Dpr1)在胃癌组织中的表达及其对survivin介导的细胞凋亡的调控.方法 用RT-PCR方法检测30例患者胃癌及癌旁正常组织中Dpr1 mRNA的表达情况;用RT-PCR检测SGC7901细胞转染pcDNA3.1-Dpr1质粒前后Dpr1和survivin mRNA表达的变化;用Western blot检测转染前后Dvl-2、β-catenin及survivin蛋白表达的变化;用流式细胞术检测转染后SGC7901细胞凋亡率的变化. 结果本组30例胃癌组织中17例Dapperl mRNA表达下调,发生率为57%,且与胃癌的浸润深度和分化程度相关(P＜0.05);转染pcDNA3.1-Dpr1后SGC7901细胞中Dpr1 mRNA表达水平上调,survivin mRNA表达水平下调;Dvl-2、β-catenin以及Survivin蛋白表达量降低;转染pcDNA3.1-Dpr1质粒后SGC7901细胞的凋亡率升高. 结论 Dpr1能够通过经典WNT通路抑制凋亡相关蛋白survivin的表达,在胃癌细胞的凋亡中发挥重要作用.     

ZBTB8A在胃癌中的表达及其临床意义

目的探讨胃癌中ZBTB8A在胃癌组织及细胞中的表达及其临床意义。方法采用实时荧光定量PCR（RT—PCR）检测ZBTBSAmRNA在正常胃黏膜细胞系GES-1与胃癌细胞系SGC7901和MGC803中的表达差异,以及在104例原发性胃癌组织及其对应癌旁组织和40例正常胃黏膜组织中的表达差异,并分析ZBTB8A表达与胃癌临床病理特征之间的关系。结果ZBTB8AmRNA在胃癌细胞系SGC7901、MGC803和正常胃黏膜细胞系GES-1中的表达量分别为0．00138±0．00015、0．00158±0．00021和0．00036±0．000055,其在SGC7901和MGC803细胞系中的表达量高于GES．1细胞系,差异有统计学意义（均P〈0．01）。ZBTB8AmRNA在胃癌组织、癌旁组织和正常胃黏膜组织中的表达量分别为0．0152±0．0126、0．0070±0．0061和0．0079±0．0036,其在胃癌组织中的表达量高于后两者（均P〈0．01）,而癌旁组织与正常胃黏膜组织表达的差异无统计学意义（P〉0．05）。ZBTB8A表达与胃癌浸润深度、淋巴结转移、肿瘤分期及分化程度有关（均P〈0．05）,但与患者年龄、性别、肿瘤大体分型和组织分型无关（均P〉0．05）。结论ZBTB8A可能是胃癌潜在的致癌因子,并参与胃腺癌细胞分化、浸润和转移等过程。     

胃癌顺铂耐药细胞株的建立和基因表达谱分析

目的 建立人胃癌顺铂耐药细胞株,探讨其基因表达谱与顺铂耐药的相关性.方法 采用浓度梯度递增法诱导胃癌SGC7901细胞株,建立对顺铂耐药的SGC7901/DDP细胞株.应用Affymetrix基因芯片HG-U133 Plus 2.0筛选SGC7901和SGC7901/DDP的耐药相关的差异基因.结果 建立可耐受1.0 mg/L顺铂浓度的耐药株SGC7901/DDP,耐药指数22.85.应用电镜观察其形态学变化,细胞计数法绘制生长曲线,噻唑蓝(MTT)检测检测药物敏感性,流式细胞术分析细胞周期.利用基因芯片筛选得到在耐药细胞株和敏感株中表达差异大于10倍的基因共107条,其中JNK1和JNK2为与耐药相关的明显上调基因.Western blot证实JNK的磷酸化活性形式P-JNK在耐药株中表达明显升高.SP600125抑制P-JNK表达后耐药蛋白P-gp表达明显减低.结论 高通量的基因芯片筛选得到大量有意义的与顺铂耐药相关的差异基因,P-JNK可成为逆转耐药的新的靶点.     

脾酪氨酸激酶基因的再激活对胃癌生成和发展的影响

目的探讨去甲基化酶5-氮-2＇-脱氧胞苷对脾酪氨酸激酶（Syk）基因再表达的影响，以及Syk基因的再表达对胃癌肿瘤生成和发展的影响。方法分别用RT-PCR和MSP法检测SGC7901、MGC803、MKN28和MKN45细胞株中Syk基因表达及甲基化情况；用5-氮-2＇-脱氧胞苷处理人胃癌细胞株5GC7901后，检测此细胞株中Syk基因的甲基化及再表达情况，并用此治疗过的细胞株和未经治疗的细胞株分别接种于裸鼠皮下，对比观察裸鼠的成瘤率。结果SGC7901和MKN45细胞株中没有检测到Syk基因的表达，但可检测到Syk基因的甲基化。检测用5-氮-2＇-脱氧胞苷处理过的人胃癌SGC7901细胞株，Syk基因启动子没有甲基化，RT-PCR可检测到有Syk基因。用无Syk基因表达的SGC7901细胞株接种于10只对照组裸鼠皮下，8周后均有肿块生成；而用有Syk基因再表达的细胞株接种于另10只裸鼠（治疗组）皮下，8周后只有3只有肿块生成；对照组裸鼠的成瘤率显著高于治疗组（χ^2=7．91，P〈0．05）。结论5-氮-2＇-脱氧胞苷通过去甲基化使SGC7901细胞株中Syk基因再表达，Syk基因的再表达抑制了胃癌的生成和发展。     

缺氧诱导因子-1α参与胃癌多药耐药的机制

目的 探讨缺氧诱导因子(HIF)-1α参与胃癌SGC7901/DDP细胞株多药耐药的机制.方法 采用化疗药物顺氯胺铂(顺铂,DDP)按浓度梯度递增法(0.02～1.00mg/L)诱导胃癌SGC7901细胞株,10个月后成功建立对顺铂稳定耐药并具有MDR、MRP4表型的胃癌SGC7901/DDP细胞株,应用HIF-1α通路抑制剂YC-1(75 μmol/L)抑制HIF-1α在敏感株SGC7901和耐药株SGC7901/DDP中的表达,通过噻唑蓝(MTT)比色法检测药物敏感性,流式细胞术分析细胞凋亡率,逆转录一聚合酶链反应(RT-PCR)和Western blot检测敏感株SGC7901和耐药株SGC7901/DDP中HIF-1α和耐药蛋白P-糖蛋白(P-gp)的表达变化.结果 YC-1抑制HIF-1α表达后,耐药株SGC7901/DDP的药物敏感性显著增加,对DDP的半数抑制浓度(IC50)由(52.175±6.163)mg/L降低为(11.078±3.645)mg/L(P＜0.01).耐药株SGC7901/DDP的细胞凋亡率由1.03%增加为14.26%(P＜0.01).耐药株SGC7901/DDP的P-gP在基因和蛋白表达水平均明显减低,分别由1.846±0.135和2.017±0.102下降至0.814±0.057和0.962 ±0.039(P＜0.01).结论 HIF-1α可通过调节P-gP表达及抗凋亡信号通路参与胃癌顺铂耐药,可成为逆转胃癌耐药的新的靶点.     

Notchl参与调节胃癌顺铂耐药的机制

目的 探讨Notchl参与胃癌SGC7901/DDP细胞株顺铂耐药的机制.方法 应用Notchl通路抑制剂MW167抑制Notchl在敏感株SGC7901和耐药株SGC7901/DDP中的表达,通过噻唑蓝(MTT)比色法检测药物敏感性,流式细胞术分析细胞凋亡率,逆转录-聚合酶链反应(RTPCR)和Western blot检测敏感株SGC7901和耐药株SGC7901/DDP中Notch1和NF-kappa B(NF-κB),耐药蛋白P-糖蛋白(P-gP)的表达变化.结果 MW167抑制Notch1表达后敏感株SGC7901和耐药株SGC7901/DDP的药物敏感性显著增加,细胞凋亡率分别为23.71%和12.48%(P＜0.01),NF-κB和耐药蛋白P-gP在基因和蛋白表达水平均明显减低(P＜0.01).结论 Notch1可通过调节P-gP表达及抗凋亡信号通路参与胃癌顺铂耐药,可成为逆转胃癌耐药的新的靶点.     

人肝癌多药耐药细胞系HepG2／ADM和其亲本细胞系HepG2蛋白质双向电泳图谱的差异分析

目的建立人肝癌多药耐药细胞系HepG2／ADM和其亲本细胞系HepG2蛋白质双向电泳图谱，分析两者间蛋白质表达的差异和特点。方法采用MTT法检测HepG2／ADM和HepG2细胞对不同化疗药物的敏感性，利用双向电泳技术分离HepG2／ADM和HepG2细胞的总蛋白质，凝胶银染后，用ImageMaster 2D Platinum软件分析两者之间的差异蛋白。结果相对于正常HepG2细胞，HepG2／ADM细胞表现出明显的多药耐药；HepG2／ADM和HepG2细胞的蛋白质点在双向电泳图谱上的分布模式基本一致；识别了45个在两株细胞之间差异表达的蛋白质点，HepG2／ADM细胞有25个蛋白点表达上调，9个蛋白点表达下调，7个蛋白点在HepG2／ADM细胞特异表达，4个蛋白点在HepG2细胞特异表达。结论本研究初步建立了分辨率较高、重复性较好的HepG2／ADM和HepG2细胞总蛋白质双向电泳图谱，两者之间存在一些差异表达蛋白，为进一步使用蛋白质组学方法研究肝癌多药耐药奠定了良好基础。