WWOX在胆管癌组织中的表达及其对胆管癌细胞生物学行为的影响

目的 研究抑癌基因WWOX表达对胆管癌RBE细胞生长的影响.方法 采用免疫组化方法检测2005年7月至2010年5月54例胆管癌组织、12例正常胆管组织中WWOX蛋白表达水平.将携有WWOX基因的真核表达载体转染胆管癌细胞系RBE细胞(RBE/WWOX组),筛选稳定转染的细胞并扩增培养,以转染空载质粒(RBE/con组)及未经转染(自然生长组)的RBE细胞作为对照.荧光定量RT-PCR和Western Blot法检测WWOX在RBE细胞中的表达情况;噻唑蓝实验检测转染前后各组细胞增殖活性;FCM法检测各组细胞的凋亡;JC-1染色法检测细胞线粒体膜电位;Transwell小室侵袭实验检测各组肿瘤细胞侵袭力;荧光定量RT-PCR和Western Blot法检测胆管癌细胞bcl-2、bax、FasL、caspase-3表达的变化.结果 WWOX在胆管癌中的表达低于正常胆管组织(P＜0.05),蛋白表达的缺失频率为40.7%.建立稳定表达WWOX基因的RBE/WWOX细胞株,mRNA及蛋白表达明显增加.转染后的RBE细胞噻唑蓝吸光度明显下降(P＜0.05).与自然生长组和RBE/con组比较,FCM显示RBE/WWOX组细胞的凋亡率明显增高(P＜0.01),JC-1显示转染后的线粒体膜电位下降(P＜0.01),侵袭实验显示转移至下室滤膜的细胞数明显减少(P＜0.01).荧光定量RT-PCR结果显示bcl-2 mRNA表达是自然生长组的0.12倍,bax、caspase-3 mRNA分别是自然生长组的4.72和2.57倍,FasL mRNA的表达无明显变化;Western Blot法检测发现bcl-2蛋白的表达降低,bax、caspase-3蛋白表达升高,FasL无明显变化.结论 抑癌基因WWOX通过诱导胆管癌细胞凋亡发挥抗肿瘤增殖的作用.

Abstract：

Objective To study the effects of anti-oncogene WWOX on cell growth of cholangiocarcinoma. Methods The expression of WWOX protein was detected with immunohistochemical method-SP in 54 patients with cholangiocarcinoma from July 2005 to May 2010 and 12 samples of normal bile duct tissues. The recombinant WWOX eukaryotic expression plasmid was introduced into RBE cells by liposome-mediated transfection and positive cell clones were selected and amplified. The mRNA and protein expressions in RBE cells stably transfected with WWOX were investigated by quantitative RT-PCR and Western Blot before and after transfection. Cell proliferation was tested by MTT, cell apoptosis was assessed by FCM, the alteration of mitochondria membrane potential (△Ψm) was detected by JC-1 staining method,cell invasion was determined by Transwell chamber assay. The expression change of bcl-2, bax, FasL,caspase-3 mRNA and protein was detected by quantitative RT-PCR and Western Blot. Results The expression of WWOX protein was significantly lower in cholangiocarcinoma than that in normal bile duct tissues and loss of WWOX protein expression was found in 40. 7% of cholangiocarcinoma specimens ( P ＜0.05). RBE cells with stable transfection of WWOX were established. Quantitative RT-PCR showed that the expression of WWOX mRNA was significantly enhanced and Western Blot demonstrated that WWOX protein expression was markedly increased. MTT showed that WWOX gene transfection significantly decreased the proliferation of RBE cells ( P ＜ 0. 05 ). FCM analysis showed that the apoptosis rate after transfection was significantly promoted [( 1.1 ± 0. 6 ) % vs. ( 1.7 ± 0. 5 ) % vs. ( 35.2 ± 4. 4 ) %, P ＜ 0. 01], JC-1 staining method indicated that the experimental group was loss of △Ψm [( 12. 6 ± 1.9 ) % vs. ( 13.6 ± 1.8 ) % vs.(48. 7 ± 2. 9 ) %, P ＜ 0. 01], transwell chamber assay showed that the number of transfected cells that passed the transwell membrane was significantly less than those of control groups ( 77 ± 6 vs. 72 ± 8 vs. 48 ±6, P ＜0. 01 ). Quantitative RT-PCR and Western blotting showed that the expression of bcl-2 mRNA and protein was markedly decreased and the expression of bax, caspase-3 were significantly increased. There was no significant change in the expression of FasI. Conclusion WWOX exerts its antitumor effect against proliferation through inducing cell apoptosis in cholangiocarcinoma.     

Apr-1基因对胆管癌细胞QBC939细胞周期的调节机制研究

目的 研究Apr-1基因对胆管癌细胞的细胞周期调节作用及机制.方法 采用脂质体介导法将Apr-1基因转染胆管癌细胞系QBC939,建立稳定表达Apr-1基因的细胞模型(QBC939-Apr-1).运用RT-PCR检测转染前后QBC939细胞系中Apr-1 mRNA的表达;流式细胞分析以及生长曲线等方法观察目的 基因对该细胞系的细胞周期的影响.采用细胞周期基因芯片,观察Apr-1基因对细胞周期相关基因表达的调节作用.结果 Apr-1基因在QBC939细胞系中呈阴性表达,转染Apr-1基因的QBC939-Apr-1细胞出现了Apr-1 mRNA的表达,成功建立了稳定表达Apr-1基因的细胞模型,该细胞模型表现出细胞生长受抑,细胞周期显示G2期细胞由9%增加至13%(P＜0.01).细胞周期抑制;并且细胞周期基因芯片检测结果发现:Skp2、UBE基因的表达水平出现明显上调,而CDC6、Cyclin H等25种基因的表达下降,其中MRE11A、CKS2、CDK8、CDC45下调在3倍以上.结论 Apr-1基因在体外能够使QBC939细胞的细胞周期在G2期延长,出现细胞周期多种调节基因的表达差异.

Abstract：

Objective To investigate the role and the mechanism of Apr-1 gene on cholangiocarcinoma QBC939 cell lines proliferation and cell cycle regulation. Methods Apr-1 gene was transfected into QBC939 cells by using liposomes to establish a QBC939 cell model ( QBC939-Apr-1 ) stably expressing Apr-1 gene. Apr-1 mRNA expression and the changes in cell cycle and cell growth of QBC939 cells were analyzed by RT-PCR, flow cytometry ( FCM ) and growth curve before and after transfection. The regulatory effect of Apr-1 gene on the expression of cell cycle-related genes was investigated in QBC939 cells before and after Apr-1 transfection using cell cycle gene microarrays. Results Significant suppression of cell growth was observed with the cell model stably expressing Apr-1 gene. Apr-1 over-expression caused cell arrest from 9% to 13% (P ＜0. 01 ) increase in G2 population. Cell cycle gene microarrays demonstrated that the expression of Skp2 、UBE1 was up-regulated, while the expression of MRE11A 、CKS2 、CDK8 、CDC45 was down-regulated by more than 3 folds. Conclusions Apr-1 gene suppresses QBC939 cell proliferation in vitro, QBC939 cells presented with differences in the expression of cell cycle-related genes after Apr-1 gene transfection.     

反义miR-30a-5p对人脑胶质瘤细胞U251生长的抑制作用

目的 观察敲低microRNA(miR)-30a-5p表达对人脑胶质瘤U251细胞生物学特征的影响.方法 用脂质体介导转染寡聚核苷酸抑制物(miR-30a-5p inhibitor)于人脑胶质瘤U251细胞.采用实时聚合酶链反应(real-time PCR)检测转染后U251细胞的miR-30a-5p表达水平以鉴定抑制效果;噻唑蓝(MTT)比色法评价miR-30a-5p inhibitor抑制U251细胞生长的作用;Transwell实验检测细胞侵袭能力变化;流式细胞术检测细胞周期变化;Annexin V法检测细胞早期凋亡.结果 real-time PCR检测结果 显示转染miR-30a-5p inhibitor后,肿瘤细胞miR-30a-5p表达下降,细胞增殖活性降低,细胞侵袭能力明显受到抑制,细胞周期阻滞在G0/G1期及早期凋亡增加.结论 miR-30a-5p可能是癌微RNA(oncomiR)之一,有望成为人脑胶质瘤基因治疗的候选靶点.

Abstract：

Objective To investigate the effect of knock-down of miR-30a-5p on the biological characteristics of U251 glioblastoma cells. Methods miR-30a-5p inhibitor, mediated by Lipofectamine 2000, was transfected to U251 cells for knocking down miR-30a-5p. Real-time polymerase chain reaction (PCR) was conducted to detect the expression of miR-30a-5p in transfected cells. The cell proliferation rate was detected by methyl thiazol tetrazolium (MTT) assay, and cell cycle kinetics was examined by flow cytometry. The cell invasive ability was evaluated by Transwell assay and apoptosis detected by Annexin V assay. Results The expression of miR-30a-5p in the miR-30a-5p inhibitor group was significantly down-regulated. The cell proliferation activity and invasive ability were reduced. Cells were arrested in G0/G1 phase, and apoptosis was induced in cells transfected with miR-30a-5p inhibitor as compared to those of the cells transfected with scramble siRNA and control cells, so suppression of miR-30a-5p expression rendered the glioma cells harboring less aggressive phenotype. Conclusion miR-30a-5p is one of oncomiRs. It may be a candidate target miRNA for gene therapy of gliomas.     

雷帕霉素抑制人前列腺癌细胞增殖及其作用机制

目的 观察雷帕霉素(Rapamycin)对体外培养的人前列腺癌PC-3M-2B4细胞增殖及凋亡的影响,探讨其机制.方法 分别用不同浓度的雷帕霉素(100、200、400、800μg/L)对细胞进行干预后,采用噻唑蓝(MTT)比色法检测细胞增殖变化,流式细胞术检测细胞凋亡变化,Western blot 法检测凋亡相关蛋白bcl-2及bax表达的变化.结果 雷帕霉素能明显抑制PC-3M-2B4细胞的增殖活性,此作用呈现量-效、时-效关系.雷帕霉素呈浓度依赖性诱导细胞凋亡.雷帕霉素作用PC-3M-2B4细胞后,细胞内凋亡抑制蛋白bcl-2的表达明显降低,bax蛋白的表达明显增加.结论 雷帕霉素能够通过调节凋亡相关蛋白bcl-2和bax的表达比例,诱导前列腺癌细胞凋亡,从而抑制肿瘤生长.

Abstract：

Objective To investigate the effects of Rapamycin on the growth and apoptosis of human prostate carcinoma cell line PC-3M-2B4. Methods The inhibitory effect of Rapamycin was observed at 100,200,400,800μg/L on the growth of human prostate carcinoma cell line PC-3M-2B4 in serum-free medium for different concentrations by methyl thiazol tetrazolium (MTF) assays. Flow cytometry (FCM)analysis was used to study the changes of cell apoptosis. The expression level of bcl-2 and bax was determined by Western blotting. Results Rapamycin caused dose-dependent inhibition on the growth of human prostate carcinoma cell line PC-3M-2B4 in a concentration-and time dependent manner. Rapamycin induced the apoptosis of PC-3M-2B4 cells in a concentration-dependent manner. The levels of bcl-2 protein were reduced gradually with the increase of concentration or action time. Conclusion Rapamycin, a mTOR inhibitor, inhibits the growth of human prostate cancer cell and induces apoptosis of human prostate cancer cell. mTOR might be a potential target for anti-prostate cancer.     

二甲双胍对肝癌细胞增殖及凋亡相关基因表达的影响

目的 观察二甲双胍对人肝癌Hep-G2细胞增殖、凋亡及裸鼠皮下瘤生长的影响.方法 噻唑蓝(MTT)比色法分别检测二甲双胍作用于细胞后其细胞活力及生长抑制率;流式细胞术检测二甲双胍作用后细胞周期时相、凋亡率;免疫印迹法(Western blot)检测凋亡相关蛋白的表达;将Hep-G2细胞接种于裸鼠,观察不同浓度二甲双胍对裸鼠皮下瘤生长的影响.结果 20mmol/L二甲双胍作用细胞48h时,细胞生长周期阻滞于G0/G1期,细胞凋亡率为(20.57±3.16)%;Western blot检测显示bcl-2、bcl-xl蛋白表达随着药物浓度的增加而减少,Bid蛋白表达随着药物浓度增加而增加.高剂量二甲双胍组及联合用药组裸鼠皮下瘤体积显著小于对照组,20d时两组抑瘤率分别为40.8%、72.8%.结论 二甲双胍通过线粒体介导的凋亡通路途径来诱导人肝癌细胞发生凋亡,并抑制肝癌细胞裸鼠瘤生长.

Abstract：

Objective To investigate the effect of metformin on proliferation, apoptosis of Hep-G2 cells and tumor growth in nude mice. Methods Hep-G2 cells were treated with metformin at different concentrations, and cell viability was measured by using methyl thiazol tetrazolium (MTT) method. Cell cycle and apoptosis rate were assayed by flow cytometry. The expression of apoptosis-related protein were detected by Western blotting.Nude mice were transplanted with Hep-G2 cells, and tumor growth inhibition rate was detected. Results After Hep-G2 cells were treated with 20 mmol/L metformin for 48 h, the growth cycle was arrested in G0/G1 phase, the apoptosis rate was (20.57±3.16)%, the expression of bcl-2 and bcl-xl proteins was down-regulated after metformin treatment, while the Bid protein was significantly increased, tumor size in the high-dose metformin group, cisplatin combined with metformin group were significantly reduced as compared with control group, and the inhibition rates in the high-dose metformin group, cisplatin combined with metformin group was 40.8% and 72.8% respectively. ConclusionMetformin inhibits proliferation of Hep-G2 cells, and induces apoptosis in vitro and significantly inhibits the growth of hepatocellular carcinoma in nude mice.     

人内皮型一氧化氮合成酶基因转染抑制人血管平滑肌细胞增殖及其机制

目的 探讨人内皮型一氧化氮合成酶基因(heNOS)转染抑制人血管平滑肌细胞(HVSMCs)增殖的机制.方法 以AdCMV-heNOS病毒感染复数分别为50、150、250、300、450 MOI,转染HVSMCs,放射免疫法检测转染HVSMCs中的环一磷酸鸟苷(cGMP)的表达变化;Western blot检测血管平滑肌细胞中p21、p27蛋白的变化,流式细胞术分析对细胞周期分布及凋亡的影响.结果　(1)转染120 h,A570值分别为1.410±0.081、1.357±0.150、1.303±0.311、0.995±0.248、0.731±0.101,其中感染复数300 MOI明显稳定抑制血管平滑肌细胞的增殖.(2)转染72 h,未转染组、Ad-LacZ转染组、Ad-heNOS转染组cGMP的含量分别为(7.91±0.39)、(8.36±0.34)、(12.89±2.06)μnol/L,差异有统计学意义(P＜0.01).(3)转染48 h,Westem blot检测转染组p27、p21表达明显上调,而未转染组虽也有p21、p27的表达,但两组差异有统计学意义(P＜0.05).(4)无血清转染48 h后血清刺激24 h,未转染组、Ad-LacZ转染组、Ad-heNOS转染组G0/G1期分别为(64.23±1.58)%、(64.96±1.36)%、(76.03±2.27)%,差异有统计学意义(P＜0.01).(5)转染3 d,第1天,未转染组、Ad-LacZ转染组、Ad-heNOS转染组细胞凋亡率分别为(4.70±0.56)%、(5.53±0.74)%、(8.53±1.06)%,差异无统计学意义(P＞0.05).第3天,细胞凋亡率分别为(5.40±0.62)%、(8.30±0.80)%、(9.30±0.90)%,差异无统计学意义(P＞0.05).结论　heNOS基因转染HVSMCs抑制细胞增殖,通过p21、p27上调导致细胞周期的阻滞,无诱导细胞凋亡.

Abstract：

Objectiye To invesigate the effect of human endothelial nitric oxide synthase (heNOS ) gene transfer on the proliferation of in vitro cultured human vascular smooth muscle cells (HVSMCs)and the mechanism. Methods The HVSMCs were transfeced with multiplicity of infection (MOI) of 50,150,250, 300,450. cGMP was measured by radioimmunoassay in HVSMCs. The expression levels of p21 and p27 were detected by Western blotting. Cell cycle and apoptosis were assayed by flow cytometry. Results (1) At 120th h, the A570values were respectively 1.410±0.081, 1.357 ±-0. 150, 1.303±0.311,0. 995 ±0. 248 and 0. 731 ±0. 101 at MOI of 50, 150,250,300,450. The proliferation of HVSMCs was significantly and stably inhibited with MOI 300 of AdCMV-heNOS; (2) Af72nd h after the gene transfer,cGMP levels were increased in heNOS-transduced ( 12. 89 ±2. 06) compared to LacZ- (8.36 ±0. 34) and non-tranduced (7. 91 ± 0. 39) cells ( P ＜ 0. 01 ); (3) At 48th h after the gene transfer, the expression of heNOS in HVSMCs up-regulated p21 and p27 (P＜0. 05); (4) After 48 h tronsfected with sersuln-depriveol and for 24 h serum stimulation, the cell cycle was significantly arrested in G0/G1 phase in heNOStransduced group, and G0/G1 was respectively ( 64. 23 ± 1.58 ) %, ( 64. 96 ± 1.36 ) %, ( 76. 03 ±2. 27 ) % in non-, LacZ- and heNOS-transduced cells; ( 5 ) At first and third day afer the gene transfer,there was no increase in apoptosis at the first day in all transduced cells ( P ＞ 0. 05 ). Conclusion Adenovirus-mediated heNOS gene transfer to HVSMCs inhibits cell proliferation via up-regulation of p21 and p27 resulting in a delay in cell progression not apoptosis.     

Exogenous p27KIP1 expression induces anti-tumour effects and inhibits the EGFR/PI3K/Akt signalling pathway in PC3 cells

p27 is a cyclin-dependent kinase inhibitor that regulates the progression of cells from G1 to S phase of the cell cycle. Loss of p27 has been associated with disease progression and with an unfavourable outcome in prostate cancer. In this study, we investigated whether exogenous p27 expression in the human androgen-independent prostate cancer PC3 cell line had any effect on cell growth, and we studied the molecular mechanisms involved. p27 expression was restored in PC3 cells by plasmid delivery. Cell proliferation and apoptosis were assessed in PC3 cells transfected with p27. We also investigated the effects of p27 on the epidermal growth factor receptor （EGFR）/ phosphatidylinositol 3-kinase （PI3K）/Akt signalling pathway in PC3 cells. By restoring p27 expression in PC3 cells, we observed that p27 reduced proliferation and induced arrest in G0/G1 phase. Moreover, p27-transfected PC3 cells underwent apoptosis, as shown by flow cytometric analysis and western blotting analysis of Bcl-2, Bax, Bad, caspase-3 and poly（ADP-ribose）polymerase expression. Furthermore, the p27-induced anti-tumour action corre- lated with inhibition of the EGFR/PI3K/Akt signalling pathway, as confirmed by western blotting analysis and densitometry of EGFR, PI3K （p85）, Akt and p-Akts473 expression. Our results suggest that exogenous expression of p27 inhibits the proliferation of PC3 cells through induction of G1 arrest and apoptosis, and this process correlates with inhibition of the EGFR/PI3K/Akt signalling pathway.     

HCCR-2反义核酸对肝癌HepG2细胞的作用

Objective To investigate the effects of antisense recombinant euraryotic expression vector of HCCR-2 on the proliferation and apoptosis of HepG2. Methods The antisense recombinant eukaryotic expression vector of HCCR-2 was constructed. The vector was stably transfected to the HepG2 cells, and positive clones were selected by G418 (antiseuse vector group), pIRES2-EGFP vector was transfected into the HepG2 cells in the same way (pIRES2-EGFP group). The conditions of the nontransfected HepG2 cells were used as control (HepG2 group). Changes in cell growth curve, cell cycle, cell apoptosis and morphology of HepG2 cells after the transfec-tion were detected by MTT method, flow cytometry and transmission electron microscopy, respectively. All the data were analyzed by one-way ANOVA and chi-square test. Results The expression level of HCCR-2 mRNA was down-regulated to 0.39±0.04 in antisense vector group, and the expression level of HCCR-2 mRNA in pIRES2-EGFP group and HepG2 group were 0.62±0.06 and 0.72±0.03, respectively, with significant difference among the 3 groups (F=43.701, P<0.05). The apoptotic rate of HepG2 cells in antisense vector group, pIRES2-EGFP grop and HepG2 group were 13.30%, 2.51% and 2.07%, respectively, with significant difference among the 3 group (χ2=6.793, 8.721, P<0.05). The growth of HepG2 cells in antisense vector group was retarded, and was blocked in G0/G1 stage. Conclusions The HCCR-2 antisense recombinant eukaryotic expression vector can inhibit the mRNA expression of HCCR-2 and promote the apoptosis of cells. HCCR-2 may be involved in cell regulation and the proliferation of hepatocellular carcinoma cells.     

多囊蛋白1氨基端肽对常染色体显性多囊肾囊肿衬里上皮细胞增殖和凋亡的影响

目的 探讨多囊蛋白1氨基端肽（PC-1NTP）对常染色体显性多囊肾病（ADPKD）肾囊肿衬里上皮细胞增殖、细胞周期和凋亡的影响.方法 用噻唑蓝（MTT）法检测PC-1NTP对ADPKD囊肿衬里上皮细胞增殖的影响.用流式细胞仪分析细胞周期与凋亡状况.用荧光定量PCR检测细胞中细胞周期素cyclinD1、p21WAF1、bax、bcl-2和小染色体维护蛋白2（MCM-2）的mRNA表达.结果 PC-1NTP使ADPKD囊肿衬里上皮细胞G0/G1期细胞百分比显著增多,S期细胞百分比显著减少,并明显抑制其增殖和凋亡;同时细胞中p21和bcl-2 mRNA表达明显增高（P＜0.01）,cyclinD1、bax和MCM-2的mRNA表达明显减弱（P＜0.01或P＜0.05）.结论 PC-1NTP能明显抑制ADPKD囊肿衬里上皮细胞的增殖和凋亡,减慢细胞周期进程,其作用机制可能是通过调节G1/S关卡调节因子cyclinD1/p21WAF1和凋亡调节蛋白bcl-2/bax的表达实现的.PC-1NTP有希望成为治疗ADPKD的可选药物.     

Mechanisms involved in resveratrol-induced apoptosis and cell cycle arrest in prostate cancer-derived cell lines

Resveratrol is a polyphenol found at high concentrations in grapes and red wine with reported anticarcinogenic effects. We studied the molecular mechanism of resveratrol-induced apoptosis and proliferation arrest in prostate derived cells PZ-HPV-7 (nontumorigenic line), LNCaP (androgen-sensitive cancer line), and PC-3 (androgen-insensitive cancer line). Apoptosis and cell cycle distribution were evaluated by flow cytometry and proliferation by MTT assay and direct cell counting. Caspases, bax, bcl-2, cyclins, Cdks, p53, p21, and p27 were measured by Western blot and kinase activities of cyclin/Cdk complexes by immunoprecipitation followed by kinase assays with appropriate substrates. Resveratrol induced a decrease in proliferation rates and an increase in apoptosis in cancer cell lines in a dose- and time-dependent manner. These effects were coincident with cell accumulation at the G0/G1 phase. In LNCaP and PC-3, the apoptosis induced by resveratrol was mediated by activation of caspases 9 and 3 and a change in the ratio of bax/bcl-2. Expressions of cyclin D1, E, and Cdk4 as well as cyclin D1/Cdk4 kinase activity were reduced by resveratrol only in LNCaP cells. In contrast, cyclin B and Cdk1 expression and cyclin B/Cdk1 kinase activity were decreased in both cell lines in the presence of resveratrol. However, modulator proteins p53, p21, and p27 were increased by resveratrol only in LNCaP cells. These effects probably result in the observed proliferation arrest and disruption of cell cycle control. In addition, the specific differences found between LNCaP and PC-3 suggest that resveratrol acts through different mechanisms upon the androgen or estrogen receptor cell status.     

紫龙金对前列腺癌细胞系DU-145的体外作用

目的　探讨中药紫龙金 (ZLJ)对雄激素非依赖型人前列腺癌细胞系DU 14 5的体外作用及其机制。方法　应用四甲基偶氮唑蓝 (MTT)比色法、软琼脂集落生长试验和流式细胞术测定ZLJ对DU 14 5的增殖抑制、集落生长抑制、周期阻滞和诱导凋亡作用 ,应用逆转录 聚合酶链反应 (RT PCR)和Westernblot方法检测对凋亡相关基因 /蛋白bcl 2和bax ,抑癌基因 /蛋白p16表达的影响。结果　ZLJ具有时间和剂量依赖性增殖抑制、G0 /G1期阻滞和诱导凋亡作用 ,作用 72hIC50 为 0 .42g/L ,ZLJ 0 .1g/L作用 14d对DU 14 5细胞集落生长抑制率为 87.9% ,ZLJ 0 .5 g/L作用 2dG0 /G1期细胞比例从 41.3 0 %增高至 76.70 %。ZLJ可以下调bcl 2基因 /蛋白 ,上调bax和p16基因 /蛋白的表达。 结论　ZLJ可能通过抑制DU 14 5细胞的集落生长、增殖抑制、G0 /G1期阻滞、诱导凋亡、下调bcl 2基因 /蛋白 ,上调bax和 p16基因 /蛋白表达等作用机制发挥抗肿瘤作用。     

金属硫蛋白1E对胰腺癌SW1990细胞生长的影响

目的 观察外源性人金属硫蛋白1E(MT1E)基因对胰腺癌SW1990细胞生长的影响.方法 构建MT1E基因真核表达载体,转染SW1990细胞并获得阳性单克隆细胞.用Westernblot技术检测转染前后MT1E蛋白表达,噻唑蓝(MTT)实验检测其增殖能力的变化,流式细胞仪分析细胞周期时相分布.同时检测Cyclin D1与p53的表达.结果 MT1E融合蛋白在SW1990MT1E细胞中表达.MTT结果表明,与SW1990和SW1990MT1E空细胞比较,SW1990MT1E细胞增殖速度明显增快.SW1990MT1E细胞与SW1990和SW1990空细胞比较,G0/G1期细胞明显减少,S期明显增多,差异有统计学意义.SW1990MT1E较SW1990空的细胞Cyclin D1与p53表达明显升高.结论 MT1E能够促进SW1990增殖,可能和上调Cyclin D1促使细胞进入S期增多,通过失活p53蛋白使细胞恶性变.     

Experimental study on inhibitory effects of histone deacetylase inhibitor MS-275 and TSA on bladder cancer cells

ObjectiveTo investigate the inhibitory effect of histone deacetylase (HDAC) inhibitors (MS-275 and TSA) on T24 human bladder cancer cells in vitro, and explore the possible mechanism.MethodsThe MTT assay was employed to evaluate the inhibitory effect of MS-275 and TSA on T24 cell growth. FCM was used to analyze the variation of T24 cell cycle distribution and the apoptotic ratio after T24 cells were treated with MS-275 and TSA. Histone acetylation level was detected by Western blot. mRNA expression of p21 WAF1/CIP1, cyclin A, and cyclin E was measured by FQ-PCR. Dynamic changes of Bcl-2 and bax expression were detected by FCM.ResultsMS-275 and TSA inhibited T24 cell growth in a concentration and time-dependent manner. Treatment with 4 μmol/l MS-275 or 0.4 μmol/l TSA blocked cell cycling in the G0/G1 phase and induced a significant increase in cell apoptosis. MS-275 and TSA significantly increased the level of histone acetylation, induced p21CIP1WAF1 mRNA expression, and inhibited cyclin A mRNA expression, though no significant effect was observed on cyclin E. Bcl-2 expression was down-regulated, while bax expression was up-regulated.ConclusionHDAC inhibitors can block bladder cancer cell cycle in vitro and induce apoptosis. The molecular mechanism may be associated with increased level of histone acetylation, down-regulation of p21WAF1/CIP1 expression, up-regulation of cyclin A expression, and dynamic change of bcl-2 and bax expression.     

IL-6影响骨髓基质细胞凋亡机理的初步探讨

目的通过观察IL-6对体外培养骨髓基质细胞凋亡的影响，探讨骨髓基质细胞凋亡的机理。方法取1月龄SD大鼠的骨髓基质细胞进行体外培养，通过透射电子显微镜观察、bax、bcl-2蛋白免疫组化染色、流式细胞仪检测凋亡细胞周期变化及线粒体跨膜电位改变、RT—PCR法检测凋亡细胞bax、bcl-2 mRNA表达等指标进行观察。结果IL-6组细胞G1期、凋亡率和线粒体膜电位改变均非常显著高于对照组；随着诱导时间的延长，Bcl-2 mRNA表达呈逐渐下降趋势，BaxmRNA表达呈逐渐升高趋势。Bcl-2／Bax：随着诱导时间的延长呈下降趋势。结论IL-6使大量细胞停留在G1期，阻滞细胞进入S期，使DNA合成受阻；IL-6促进凋亡的作用是通过1促进bax从胞浆中移至线粒体膜上而使bax在与bcl-2形成的异二聚体中占据优势来促进线粒体上的PT孔道开放，使内膜离子通道改变，线粒体内膜电位下降或丧失，导致Cyto c等蛋白的释放来调节细胞凋亡。     

Influence of p53 and bcl-2 on chemosensitivity in benign and malignant prostatic cell lines

The administration of cancer chemotherapeutic agents results in an increase in the apoptotic cells in the tumor: therefore, it has been assumed that anticancer drugs exhibit their cytotoxic effects via apoptotic signaling pathways. Characteristics that confer sensitivity to drug-induced apoptosis are, a functional p53 protein and expression of the apoptosis-promoting protein, bax. The role of p53 and bax/bcl-2 in drug-induced apoptosis was assessed in six prostate cell lines, 1532T, 1535T, 1542T, 1542N, BPH-1 and LNCaP using TD(50) concentrations of etoposide, vinblastine and estramustine. Cell death was monitored morphologically by fluorescent microscopy, and by flow cytometry (Annexin-V assay). Apoptotic morphology was rather low and ranged from 0.1% to 12.1%, 3.0% to 6.0% and 0.1% to 8.5% for etoposide, estramustine and vinblastine, respectively. Annexin-V binding and flow cytometry indicated apoptotic propensities of 0% to 4%, 0% to 3% and 0% to 5%, respectively. The percentage of cells responding to drug-induced apoptosis was, on average, higher in the tumor cell lines than in the normal cell lines, but showed no correlation with p53 status. The percentage of cells showing necrosis, assessed by Annexin binding and Propidium Iodide permeability in aqueous medium, tended to be much higher, and was found to be at the level of 5% to 30%. Immunoblotting demonstrated that bax and bcl-2 proteins were expressed at a basal level in all cell lines, but did not increase after exposure to TD(50) doses of the three drugs. The ratio of bax and bcl-2, measured by laser scanning densitometry, was not altered by the drug-induced DNA damage. The results suggest that apoptosis is not a major mechanism of drug-induced cell death in prostate cell lines and appears to be independent of p53 status and bax/bcl-2 expression.     

雌激素对大鼠前列腺平滑肌细胞增殖的影响

目的 观察17β-雌二醇(E2)对大鼠前列腺平滑肌细胞(PSMC)增殖的影响.方法 取体重(253±28)g的雄性SD大鼠30只,无菌切取前列腺,应用酶消化法行原代细胞培养.取3～4代传代细胞,分别加入不同浓度E2(0.1～100)nmol/L处理72 h,应用流式细胞仪检测细胞周期、细胞凋亡及其相关蛋白Cyclin D1,应用western blot法检测bcl-2和bax表达.结果 E2(1、10 nmol/L)促进PSMC从G1期向S期过渡,其S期细胞比率分别为(18.50±4.98)%、(21.16±4.83)%,显著高于对照组(12.39±2.64)%(P＜0.05),并伴随Cyclin D1蛋白表达显著增高.而高浓度E2(100 nmol/L)则抑制细胞增殖,其S期细胞比率为(7.98±1.92)%,显著低于对照组(P＜0.05),并伴随bax表达显著增加和细胞凋亡率显著升高.结论 低浓度E2能够上调CyclinD1表达加速G1期向S过渡从而促进大鼠PSMC增殖,高浓度E2则通过增加bax表达促进细胞凋亡.     

5-氟尿嘧啶诱导直肠癌HR8348细胞凋亡作用的研究

目的　探讨 5 氟尿嘧啶 (5 fluorouracil ,5 FU )体外诱导直肠癌HR83 48细胞凋亡的作用及细胞凋亡与bcl 2、bcl xl、bax及 p5 3表达的关系。 方法　经 5 FU处理HR83 48细胞 2 4h后 ,用甲基绿 派若宁染色法和TUNEL法检测细胞凋亡情况 ,并用SP免疫组织化学法检测HR83 48细胞中bcl 2、bcl xl、bax和 p5 3的表达。 结果　HR83 48细胞经 5 FU作用 2 4h后 ,细胞凋亡指数 (AI)明显高于对照组 ,差异有显著性意义 (P<0 .0 1)。 5 FU作用不同时相bcl 2的表达评分结果与对照组比较差异均无显著性意义 ;不同时相bcl xl的表达评分结果与对照组比较稍降低 ;而bax的表达评分结果随时间延长明显增加 ,2 4h、3 6h的表达评分结果明显高于对照组 (P<0 .0 1) ,而 p5 3在 5 FU组和对照组各时相均未见表达。结论　 5 FU具有诱导HR83 48细胞凋亡的作用 ;5 FU可能通过上调bax的表达并改变bax/bcl xl的比值而诱导HR83 48细胞凋亡。