Modulatory Effects of EPA and DHA on Proliferation and Apoptosis of Pancreatic Cancer Cells

In order to investigate the effects of eicosapentaenoic acid （EPA） and docosahexaenoic acid （DHA） on the proliferation, apoptosis of pancreatic cancer cell line SW1990 cells and the expression of cyclin E mRNA, the SW1990 cells were treated with different concentrations of EPA or DHA （20, 40, 60 μg/mL） for 0, 12, 24, 36 and 48 h respectively. By using MTF method, the inhibitory effects of EPA or DHA on the cell growth were assayed. Real time PCR was used to detect the expression changes of cyclin E mRNA after the SW1990 cells were treated with 40μg/mL EPA or DHA for different time. Flow cytometry was used to test the changes of apoptostic rate in the SW1990 cells treated with different concentrations of EPA or DHA for 24 h. The results showed that EPA and DHA could inhibit the growth of SW1990 cells in a time- and concentration-dependent manner （P〈0.01）. EPA or DHA could also significantly inhibit the expression of cyclin E mRNA in a time-dependent manner （P〈0.05）. EPA or DHA could induce the apoptosis of SW1990 cells in a concentration-dependent manner （P〈0.01）. It was concluded that ω-3 fatty acid could inhibit the proliferation of pancreatic cancer cell line SW1990 cells and promote their apoptosis. The down-regulation of the cyclin E expression by ω-3 fatty acid might be one of the mechanisms for its anti-tumor effect on pancreatic cancer.     

Effects of β-carotene on Biological Behavior of Human Bladder Cancer Cell Line T24

目的:探讨β-胡萝卜素对人膀胱癌T24细胞细胞增殖和凋亡的影响.方法:不同浓度的β-胡萝卜素作用于T24细胞,MTT法检测细胞增殖,流式细胞术检测T24细胞的凋亡指数.结果:MTT法检测结果显示10 μmol/L和20 μmol/L组β-胡萝卜素均能明显抑制T24细胞的生长,抑制率分别为28.83％和63.02％ (P＜0.05);流式细胞术检测显示β-胡萝卜素能诱导T24细胞调亡,5μmol/L组T24细胞的凋亡指数为(0.065±0.018) (P＜0.05),10 μmol/L和20 μmol/L组凋亡指数分别为(0.126±0.022)和(0.190±0.024)(P＜0.01),呈现剂量依赖效应,10 μmol/L组及20 μmol/L组Hochest染色可见凋亡小体形成.结论:β-胡萝卜素抑制T24细胞的生长,并且呈现剂量依赖效应,其机制可能为诱导细胞凋亡.     

Effects of Antisense Oligodeoxynucleotide to Follicle-stimulating Hormone Receptor on the Cell Proliferation and Apoptosis in Cells Derived from Human Ovarian Mucinous Cystadenocarcinoma in Vitro

The human ovarian mucinous cystadenocarcinoma (hOMC) cells were co-cultured with antisense oligodeoxynucleotide (antisense ODN), nonsense ODN, and follicle-stimulating hormone (FSH) at different concentrations for the purpose of observing the effects of antisense ODN to FSH receptor (FSHR) on the proliferation and apoptosis of cultured hOMC cells in vitro. The inhibitory rates of growth were measured by using MTT method on the 2nd, 4th, 6th, 8th and 10th days after the interference of antisense ODN, nonsense ODN, and FSH, respectively. The apoptotic rates and the cell cycles were determined by means of flow cytometry, the apoptosis indexes were detected by us-ing TUNEL, and the expression of caspase-3 was measured by using SP immunohistochemistry. Compared with that in the control group, the proliferative activity of hOMC cells was increased ob-viously in FSH groups (P<0.05 or P<0.01), decreased distinctly in antisense ODN groups (P<0.05 or P<0.01), and unchanged in nonsense ODN groups, respectively. Meanwhile, antisense ODN could significantly antagonize the FSH-promoted cell proliferative activity (P<0.01). Compared with those in the control group, the apoptotic rates and the expression of caspase-3 were dramatically increased in the mid- and high-dose antisense ODN groups (P<0.05 or P<0.01), while the number of cells in G1/G0 phase was significantly decreased and that in S phase distinctly increased (P<0.01). There was no change in nonsense ODN groups (P>0.05). It was suggested that FSH may improve the develop-ment of hOMC cells. However, antisense ODN could inhibit proliferative activity and the FSH-promoted proliferative activity in hOMC cells, at the same time, antisense ODN could inhibit hOMC cell growth by inducing apoptosis.     

The Effects of Nimesulide Combined with Cisplatin on Lung Cancer

To study the effects of cyclooxygenase 2 selective inhibitor Nimesulide (NIM) combined with Cisplatin (DDP) on human lung cancer and the possible mechanisms, the proliferation and ap-optosis of human lung cancer cell line A549 were evaluated by MTT reduction assay and flow cy-tometry respectively. The inhibitory effect on neoplasia in vivo was tested on nude mice subcutane-ously implanted tumor. Our results showed that NIM and DDP could inhibit A549 cell proliferation in a concentration-dependent pattern; this action was enhanced when NIM (25 /μmol/L) was given in combination with DDP and they worked in a synergistic or additive pattern as DDP concentration≥1 μg/ml. NIM and DDP could induce A549 cells apoptosis and the action was augmented when used in combination (P＜0.01). NIM and DDP could inhibit the growth of subcutaneously implan-ted tumors on nude mice (P＜0.05,P＜0.01) and the inhibitory rate of NIM combined with DDP was significantly higher than that of NIM or DDP group (P＜0.01, P＜0.01). It is concluded that combined use of NIM and DDP has significant synergistic antitumor effects on lung cancer cell line A549 and in animals in vivo. The synergy may be achieved by growth inhibition and apoptosis in-duction.     

Effects of POH in Combination with STI571 on the Proliferation and Apoptosis of K562 Cells

Sofar ,the 2 phenylaminopyrimidineSTI5 71isthemostsuccessfulofthemolecularlydesignedATPcompetitorsfromNovartisPharma (Basel,Switzer land) ,whichspecificallyinhibitsAbltyrosinekinaseatmicromolarconcentrations .InhibitionoftheBcr Ablkinaseactivitybythiscom…     

Influence of rmhTNF on the Chemotherapy Treatment of Small Cell Lung Cancer

Tumor necrosis factor(TNF),a kind of solu-ble cytokines that produced by activated humanmacrophages,can kill tumor cells through causingnecrosis[1-3].Because of its serious side effects,clinical uses of wild type TNF are li mited.Thereare reports currently that TNF is rebuilt by bio-technology methods in order to depress its sideeffects andi mprove curative effectiveness[2,4].Recombinant mutant human tumor necrosisfactor(rmhTNF)had already been successfullydevelopedin China.It was author…     

Effect of TSLC1 Gene on Proliferation, Invasion and Apoptosis of Human Hepatocellular Carcinoma Cell Line HepG2

The recombinant plasmid pCI-TSLC1 carrying TSLC1 gene was stably transfected into human hepatocellular carcinoma cell line HepG2. Cell proliferation was analyzed by MTT assay. The ability of migration was determined by transwell and FACSort flow cytometry was used to detect the cell cycle distribution and apoptosis. Western blotting revealed that H4 expressed higher amounts of TSLC1 protein than H15 and H0 did. The growth of TSLCl-transfected cells was significantly suppressed in vitro, and the ability of migration was reduced as well. The re-expression of TSLC1 could induce cell apoptosis. It was concluded that TSLC1 strongly inhibited the growth and ability of migration of HepG2 cell line in vitro and also induced apoptosis, suggesting that TSLC 1 could reduce the tumorigenicity of human hepatocellular carcinoma cell line HepG2 in vitro, which provided a basis for further exploring the roles of TSLC1 in hepatocellular cellular carcinoma.     

Effects of Betulinic Acid on Proliferation and Apoptosis in Jurkat Cells and Its In Vitro Mechanism

The anti-cancer effects of betulinic acid (BA) on Jurkat cells and its in vitro mechanism were examined by using MTT assay. Apoptosis was detected by using Hoechst33258 staining and annexin-Ⅴ/PI double-labeled cytometry. The effects of betulinic acid on the cell cycle of Jurkat cells were studied by propidium iodide method. RT-PCR and Western blotting were used to analyze the changes of cyclin D3, bcl-xl mRNA and protein levels in Jurkat cells after treatment with betulinic acid. Our results showed the proliferation of Jurkat cells was decreased in betulinic acid-treated group with a 24-h IC50 value being 70.00 μmol/L. Betulinic acid induced apoptosis of Jurkat cells in a time-and dose-dependent manner. The number of Jurkat cells treated with betulinic acid showed an increase in G0/G1 phase and decrease in S phase. After treatment with 0, 20, 60, 100 μmol/L betulinic acid for 24 h, the number of Jurkat cells was increased from (31.00±1.25)% to (58.84±0.32)% in G0/G1 phase, whereas it was decreased from (61.45±1.04)% to (35.82±1.95)% in S phase. PBMCs were less sensitive to the cytotoxicity of betulinic acid than Jurkat cells. The expressions of cyclin D3, bcl-xl mRNA and protein were decreased sharply in Jurkat cells treated with betulinic acid. It is concluded that betulinic acid is able to inhibit the proliferation of Jurkat cells by regulating the cell cycle, arrest cells at G0/G1 phase and induce the cell apoptosis. The anti-tumor effects of betulinic acid are related to the down-regulated expression of cyclin D3 and bcl-xl.     

Gli1小分子干扰RNA对人胰腺癌细胞增殖和凋亡的影响

目的:研究锌指转录因子Gli1小分子干扰RNA(siRNA)对人胰腺癌PC-2细胞的增殖和凋亡的影响。方法:筛选出最佳的靶向Gli1siRNA转染人胰腺癌PC-2细胞,采用逆转录-聚合酶链反应(RT-PCR)和Western印迹分别从mRNA和蛋白水平检测抑制效果,四甲基偶氮唑蓝(MTT)和TUNEL+PI双染流式细胞检测Gli1被抑制后细胞增殖和细胞凋亡的情况。结果:Gli1siRNA能在mRNA和蛋白水平下调人胰腺癌细胞株PC-2中Gli1基因的表达,以转染72h时最显著。Gli1表达被抑制后,转染后72h时PC-2细胞生长受到明显抑制,凋亡细胞显著增多。结论:Gli1与胰腺癌细胞的生长和凋亡密切相关,抑制胰腺癌细胞中Gli1表达可抑制胰腺癌细胞生长,促进胰腺癌细胞凋亡。     

沙利霉素对口腔鳞癌细胞增殖和凋亡的影响

目的:探讨沙利霉素(salinomycin)对口腔鳞癌细胞增殖和凋亡的影响,并初步探讨沙利霉素对信号通路的影响。方法:培养口腔鳞状细胞癌细胞系CAL-27,将1、2、4、8、16、32 μmol/L沙利霉素和1.25、2.5、5、10、20、40、80 μmol/L顺铂与CAL-27细胞共同培养,24 h和48 h后用细胞计数试剂盒-8(cell counting kit-8,CCK-8)法检测沙利霉素和顺铂对CAL-27细胞增殖的影响;0、2、4、8 μmol/L沙利霉素和0、5、10、20 μmol/L顺铂与CAL-27细胞共培养48 h后,通过流式细胞术检测沙利霉素和顺铂对CAL-27细胞周期的影响,蛋白免疫印迹法(Western blot)检测CAL-27细胞中天冬氨酸特异性半胱氨酸蛋白酶-3(cysteine-containing aspartate-specific proteases-3,Caspase-3)、天冬氨酸特异性半胱氨酸蛋白酶-9(cysteine-containing aspartate-specific proteases-9,Caspase-9)、脱氧核糖核酸(deoxyribonucleic acid,DNA)修复酶(poly ADP-ribose polymerase,PARP)、蛋白激酶B(protein kinase B, Akt)和磷酸化蛋白激酶B (phosphorylated protein kinase B,p-Akt)的表达。结果:CCK-8实验表明沙利霉素和顺铂均能显著抑制口腔鳞状细胞癌CAL-27细胞增殖,且抑制作用呈时间依赖性和药物浓度依赖性,但是相对于临床一线化疗药物顺铂而言,沙利霉素对CAL-27细胞增殖的抑制效果更加显著(P<0.001)。细胞周期检测表明,与加入二甲基亚砜(dimethyl sulfoxide,DMSO)的对照组相比,8 μmol/L沙利霉素与CAL-27细胞共同培养48 h后,细胞休眠期/DNA合成前期的CAL-27细胞比例明显升高(40.40%±1.99% vs.64.46%±0.90%,P<0.05), DNA合成期和DNA合成后期/有丝分裂期的CAL-27细胞比例出现降低(24.32%±2.30% vs.18.73%±0.61%,P<0.05,35.01%±1.24% vs.16.54%±1.31%,P<0.05);顺铂对CAL-27细胞周期没有特异性改变。蛋白免疫印迹法结果显示,沙利霉素在上调CAL-27细胞中Caspase-3和 Caspase-9蛋白表达(P<0.05)的同时下调PARP、Akt和p-Akt蛋白的表达(P<0.05)。结论:相对于顺铂而言,沙利霉素对CAL-27细胞增殖有更强的抑制作用,并且能将口腔鳞状细胞癌CAL-27细胞周期阻滞在细胞休眠期/DNA合成前期,同时能够诱导CAL-27细胞发生凋亡,这一机制可能和Akt/p-Akt 信号通路相关。     

沙利霉素对口腔鳞癌细胞增殖和凋亡的影响

目的:探讨沙利霉素(salinomycin)对口腔鳞癌细胞增殖和凋亡的影响,并初步探讨沙利霉素对信号通路的影响。方法:培养口腔鳞状细胞癌细胞系CAL-27,将1、2、4、8、16、32 μmol/L沙利霉素和1.25、2.5、5、10、20、40、80 μmol/L顺铂与CAL-27细胞共同培养,24 h和48 h后用细胞计数试剂盒-8(cell counting kit-8,CCK-8)法检测沙利霉素和顺铂对CAL-27细胞增殖的影响;0、2、4、8 μmol/L沙利霉素和0、5、10、20 μmol/L顺铂与CAL-27细胞共培养48 h后,通过流式细胞术检测沙利霉素和顺铂对CAL-27细胞周期的影响,蛋白免疫印迹法(Western blot)检测CAL-27细胞中天冬氨酸特异性半胱氨酸蛋白酶-3(cysteine-containing aspartate-specific proteases-3,Caspase-3)、天冬氨酸特异性半胱氨酸蛋白酶-9(cysteine-containing aspartate-specific proteases-9,Caspase-9)、脱氧核糖核酸(deoxyribonucleic acid,DNA)修复酶(poly ADP-ribose polymerase,PARP)、蛋白激酶B(protein kinase B, Akt)和磷酸化蛋白激酶B (phosphorylated protein kinase B,p-Akt)的表达。结果:CCK-8实验表明沙利霉素和顺铂均能显著抑制口腔鳞状细胞癌CAL-27细胞增殖,且抑制作用呈时间依赖性和药物浓度依赖性,但是相对于临床一线化疗药物顺铂而言,沙利霉素对CAL-27细胞增殖的抑制效果更加显著(P<0.001)。细胞周期检测表明,与加入二甲基亚砜(dimethyl sulfoxide,DMSO)的对照组相比,8 μmol/L沙利霉素与CAL-27细胞共同培养48 h后,细胞休眠期/DNA合成前期的CAL-27细胞比例明显升高(40.40%±1.99% vs.64.46%±0.90%,P<0.05), DNA合成期和DNA合成后期/有丝分裂期的CAL-27细胞比例出现降低(24.32%±2.30% vs.18.73%±0.61%,P<0.05,35.01%±1.24% vs.16.54%±1.31%,P<0.05);顺铂对CAL-27细胞周期没有特异性改变。蛋白免疫印迹法结果显示,沙利霉素在上调CAL-27细胞中Caspase-3和 Caspase-9蛋白表达(P<0.05)的同时下调PARP、Akt和p-Akt蛋白的表达(P<0.05)。结论:相对于顺铂而言,沙利霉素对CAL-27细胞增殖有更强的抑制作用,并且能将口腔鳞状细胞癌CAL-27细胞周期阻滞在细胞休眠期/DNA合成前期,同时能够诱导CAL-27细胞发生凋亡,这一机制可能和Akt/p-Akt 信号通路相关。     

木黄酮靶向抑制MKN-45胃癌细胞Notch1蛋白表达及对增殖和凋亡的影响

目的:探讨木黄酮靶向抑制Notch1蛋白表达对人胃癌细胞MKN-45增殖和侵袭作用的影响及可能机制。方法:通过不同浓度木黄酮干预胃癌细胞MKN-45,以未干预细胞为正常对照组,Western blot法检测木黄酮抑制Notch1蛋白表达的效果,MTT法检测各组MKN-45细胞的增殖能力,荧光双标流式细胞术检测各组MKN-45细胞的凋亡状况,RT-PCR检测Bcl-2和BaxmRNA的表达水平。结果:木黄酮干预MKN-45胃癌细胞后能明显抑制Notch1蛋白表达,同时抑制MKN-45细胞增殖,促进MKN-45细胞凋亡。木黄酮干预明显上调细胞凋亡相关基因Bcl-2和Bax mRNA水平。结论:木黄酮干预可靶向抑制胃癌细胞MKN-45Notch1蛋白表达,抑制胃癌细胞MKN-45增殖并促进凋亡,可能与其上调细胞凋亡相关基因Bcl-2和Bax mRNA有关。     

幽门螺杆菌、奥美拉唑及胃泌素对胃黏膜上皮细胞增生凋亡的影响

目的 采用细胞实验探讨幽门螺杆菌(Hp)、奥美拉唑与胃泌素之间是否具有相互作用.方法 奥美拉唑、Hp超声粉碎物及胃泌素分别处理不同组细胞后,依次采用MTS和流式羧基荧光素乙酰乙酸琥珀酰亚胺酯(CFSE)染色定量检测胃上皮细胞低分化AGS细胞和永生GES-1细胞增生的变化.另外,采用Hoechst33342染色定性分析细胞形态学的凋亡改变,并且再次运用流式膜联蛋白(Annexin)-Ⅴ/碘化丙啶(PI)定量分析细胞的凋亡.结果 (1)Hp、奥美拉唑处理的胃黏膜细胞AGS和GES-1凋亡比例均高于对照组[Hp及104 nmol/L奥美拉唑处理组凋亡比例分别为(17.20±0.90)%、(12.81±0.78)%比(7.96±1.25)%,(4.60±0.34)%、(6.60±0.76)%比(3.52±0.16)%,均P＜0.05],并且这一作用与奥美拉唑浓度有关.两种细胞增生均明显低于对照组(Hp及104 nmol/L奥美拉唑处理组细胞增生分别为13.35±0.55比37.78±1. 98、47.62±2.40比62.44±4.46,27.15±1.64比32.76±1.57、29.42±1.44比48.86±4.95,均P＜0.05).(2)经Hp、奥美拉唑及胃泌素两两共同处理后,凋亡方面,除Hp与500 ng/L胃泌素组处理的GES-1细胞凋亡比例较高外[(7.25±0.54)%比(4.60±0.34)%,P＜0.05],其余两种因素处理组差异均无统计学意义.流式检测显示,经Hp与奥美拉唑及胃泌素两两共同处理后,两种细胞增生均低于Hp单个因素处理后(AGS:12.68±0.09、12.28±0.31比13.35±0.55,GES-1:22.06±1.61、18.59±0.09比27.15±1.64,均P＜0.05);104 nmol/L奥美拉唑和500 ng/L胃泌素共同处理后,两种细胞增生均低于104nmol/L奥美拉唑处理组(33.23±5.98比47.62±2.40、25.97±0.74比29.42±1.44,均P＜0.05).(3)虽然胃泌素处理后的细胞增生和凋亡改变均不明显,但经奥美拉唑与胃泌素,Hp与胃泌素的组合处理后,两种细胞增生均明显低于对照组(均P＜0.05).(4)两种细胞改变比较,以AGS的改变更明显.结论 虽然胃泌素对体外胃黏膜上皮细胞没影响,但能显著提高奥美拉唑、Hp对于细胞的作用,说明奥美拉唑、Hp与胃泌素存在相互作用,能共同引起胃黏膜细胞增生减低和调亡增高,促使胃黏膜细胞减少,推测长期质子泵抑制剂治疗与Hp感染可能共同参与了抑酸治疗时萎缩性胃炎的发生.     

VEGF-C对宫颈癌细胞增殖和凋亡影响的研究

目的:探讨VEGF-C对宫颈癌Hela细胞增殖和凋亡的影响。方法:采用MTT比色法,检测不同浓度的VEGF-C对宫颈癌Hela细胞增殖的结果:及采用流式细胞仪检测VEGF-C联合顺铂(DDP)对宫颈癌Hela细胞凋亡的影响。结果:随着VEGF-C的浓度的逐渐升高,由50ng/ml、100ng/ml、150ng/ml、升至200ng/ml,Hela细胞的增殖率逐渐增加;不同浓度的VEGF-C预处理Hela细胞48h后,细胞的凋亡率依次下降。结论:VEGF-C能促进宫颈癌Hela细胞的增殖,抑制DDP诱导宫颈癌细胞Hela的凋亡。     

EGFR通过IL-6/STAT3信号通路对肺癌细胞增殖及凋亡的影响

目的 探究表皮生长因子受体（EGFR）对肺癌细胞增殖、凋亡的影响及相关机制。方法 以人正常支气管上皮细胞16HBE及肺癌细胞A549、H1299、MSTO-211H为研究对象,qRT-PCR、western blot分别检测细胞中EGFR mRNA、蛋白水平。将MSTO-211H细胞分为NG组、pcDNA3.1组、pcDNA3.1-EGFR组、pcDNA3.1-EGFR+anti-IL-6组、pcDNA3.1-EGFR+JSI-124组;qRT-PCR检测EGFR mRNA水平;CCK-8法及平板克隆实验、Hoechst33342染色法及流式细胞仪分别检测细胞增殖、凋亡情况;western blot检测EGFR、细胞周期素D1（CyclinD1）、凋亡相关蛋白B淋巴细胞瘤-2（Bcl-2）、Bcl-2相关X蛋白（Bax）及白介素-6/Janus蛋白酪氨酸激酶/信号转导子与转录激活子3（IL-6/JAK/STAT）通路相关蛋白表达。结果 与16HBE细胞比较,A549、H1299、MSTO-211H中EGFR mRNA及蛋白表达水平显著升高,且MSTO-211H细胞中EGFR mRNA及蛋白表达水平最低,因此选择MSTO-211H细胞进行后续实验;与NG组、pcDNA3.1组比较,pcDNA3.1-EGFR组MSTO-211H细胞凋亡活动明显减弱,且细胞增殖抑制率、凋亡率、Bax蛋白表达显著降低（P＜0.05）,克隆形成率、EGFR、CyclinD1、Bcl-2、IL-6、p-JAK/JAK、p-STAT/STAT蛋白表达显著升高（P＜0.05）;与pcDNA3.1-EGFR组比较,pcDNA3.1-EGFR+anti-IL-6组、pcDNA3.1-EGFR+JSI-124组MSTO-211H细胞凋亡活动明显增强,细胞增殖抑制率、凋亡率、Bax蛋白表达显著升高（P＜0.05）,克隆形成率、CyclinD1、Bcl-2、IL-6、p-JAK/JAK、p-STAT/STAT蛋白表达显著降低（P＜0.05）。结论 过表达EGFR可促进MSTO-211H细胞增殖并抑制细胞凋亡,可能是通过促进IL-6/JAK/STAT信号通路活化实现的。     

氯化两面针碱对前列腺癌细胞PC-3增殖与凋亡的影响

目的 探讨氯化两面针碱对前列腺癌细胞PC-3增殖及凋亡的影响作用。方法 采用MTT、细胞划痕和Transwell侵袭实验评估氯化两面针碱对人前列腺癌细胞PC-3增殖与侵袭的影响;流式细胞术检测氯化两面针碱对PC-3细胞凋亡的影响;免疫印迹检测AKT/mTOR及细胞凋亡蛋白B细胞淋巴瘤基因-2相关X蛋白(Bax)和B细胞淋巴瘤基因-2(Bcl-2)的表达,应用PI3K通路抑制剂LY294002探讨抑制AKT通路对前列腺癌细胞PC-3的影响。结果 氯化两面针碱能抑制PC-3细胞的增殖与侵袭,且具有剂量依赖性(P<0.01)。氯化两面针碱可下调Bcl-2、而上调Bax的蛋白表达,Bax/Bcl-2比例明显上升(P<0.01),抑制AKT和mTOR通路的磷酸化,诱导前列腺癌细胞PC-3凋亡。联合应用LY294002发现,抑制AKT通路可增强氯化两面针碱对前列腺癌细胞PC-3增殖和侵袭的抑制作用。结论 氯化两面针碱能够抑制前列腺癌细胞PC-3的增殖与侵袭,诱导其凋亡,并通过抑制AKT/mTOR磷酸化发挥其抗前列腺癌作用,可作为一种潜在治疗前列腺癌的药物。     

ALCAM基因1沉默对胃癌细胞增殖和凋亡的影响及分子机制

目的 探讨活化白细胞黏附分子(ALCAM)基因沉默对胃癌细胞增殖和凋亡的影响,并对其分子机制进行初步研究.方法 将ALCAM 和对照shRNA转染至胃癌细胞SGC-7901中,建立稳定细胞系,分别采用实时荧光定量(RT-PCR)技术和蛋白免疫印迹法(Western blot)检测转染后SGC-7901细胞中ALCAM mRNA和蛋白水平;采用CCK-8法检测转染后SGC-7901细胞的增殖情况;采用流式细胞术检测转染后SGC-7901细胞凋亡情况.采用胃癌肿瘤模型分析ALCAM基因沉默对肿瘤生长的影响.结果 ALCAM shRNA稳定细胞系ALCAM mRNA(1.01 ±0.26)和蛋白质的表达水平(1.66 ±0.23)低于对照 shRNA组细胞ALCAM mRNA(0.12 ±0.06)和蛋白质水平(0.23 ±0.09),差异有统计学意义(P<0.05).与对照shRNA稳定细胞系比较,ALCAM shRNA 稳定细胞系细胞增殖活性下降(P<0.05)、凋亡水平升高(P<0.05)、荷瘤小鼠肿瘤生长速度减缓(P<0.05).ALCAM下调并不影响总蛋白激酶B(AKT)和哺乳动物雷帕霉素靶蛋白(mTOR)的表达,而降低了AKT和mTOR磷酸化水平,抑制了mTOR活性,此外,ALCAM蛋白敲低提高了Caspase-3蛋白的表达水平,激活了凋亡信号通路.结论 ALCAM基因沉默能够降低胃癌细胞中ALCAM的表达水平,抑制胃癌细胞的增殖,增加细胞凋亡.     

雷帕霉素联合多西紫杉醇对肺癌细胞增殖和凋亡的影响

目的探讨哺乳动物雷帕霉素靶蛋白(mTOR)信号通路抑制剂雷帕霉素(RAPA)联合多西紫杉醇(DOC)对肺癌细胞系A549、SPC-A-1、95D和NCI-H446增殖抑制及凋亡的影响。方法甲基噻唑基四唑(MTT)法检测不同浓度RAPA组、DOC组及DOC联合20.0 nmol.L-1 RAPA组对肺癌细胞系增殖抑制作用;流式细胞仪法检测RAPA组、DOC组及DOC联合20.0 nmol.L-1 RAPA组对肺癌95D细胞凋亡的影响。结果 RAPA能抑制肺癌细胞的增殖,其作用呈剂量依赖性;单独应用DOC及DOC联合20.0 nmol.L-1 RAPA均可显著抑制肺癌细胞的增殖,且联合应用抑制率显著升高(P<0.05);流式细胞仪检测显示RAPA及DOC均可增加肺癌95D细胞的凋亡率(P<0.05),联合应用明显增加细胞的凋亡率(P<0.05)。结论 mTOR信号通路参与肺癌细胞的增殖与凋亡,mTOR信号通路抑制剂RAPA可增强DOC的抗肿瘤效应。