沙利度胺调控PD-L1抑制HT-29结肠癌细胞的作用及机制研究

目的：探讨沙利度胺对HT-29结肠癌细胞的抑制作用及其机制。方法：CCK-8检测沙利度胺对HT-29结肠癌细胞增殖的作用;流式细胞术检测沙利度胺对HT-29结肠癌细胞凋亡的作用和对HT-29结肠癌细胞PD-L1表达的作用;Western Blot检测沙利度胺对HT-29结肠癌细胞c-Myc、STAT3、HIF-1蛋白表达的影响。结果：沙利度胺各浓度（40、80、160、320 μmol·L-1）明显抑制HT-29结肠癌细胞的增殖;沙利度胺各浓度（20、40、80 μmol·L-1）明显促进HT-29结肠癌细胞的凋亡,明显减少HT-29结肠癌细胞表面PD-L1的表达,明显减少HT-29结肠癌细胞c-Myc、STAT3、HIF-1蛋白的表达。结论：沙利度胺对HT-29结肠癌细胞具有抑制作用,其机制可能与减少PD-L1表达及抑制癌细胞上游c-Myc、STAT3、HIF-1信号分子表达有关。     

沙利度胺调控PD-L1抑制HT-29结肠癌细胞的作用及机制研究

目的：探讨沙利度胺对HT-29结肠癌细胞的抑制作用及其机制。方法：CCK-8检测沙利度胺对HT-29结肠癌细胞增殖的作用;流式细胞术检测沙利度胺对HT-29结肠癌细胞凋亡的作用和对HT-29结肠癌细胞PD-L1表达的作用;Western Blot检测沙利度胺对HT-29结肠癌细胞c-Myc、STAT3、HIF-1蛋白表达的影响。结果：沙利度胺各浓度（40、80、160、320 μmol·L-1）明显抑制HT-29结肠癌细胞的增殖;沙利度胺各浓度（20、40、80 μmol·L-1）明显促进HT-29结肠癌细胞的凋亡,明显减少HT-29结肠癌细胞表面PD-L1的表达,明显减少HT-29结肠癌细胞c-Myc、STAT3、HIF-1蛋白的表达。结论：沙利度胺对HT-29结肠癌细胞具有抑制作用,其机制可能与减少PD-L1表达及抑制癌细胞上游c-Myc、STAT3、HIF-1信号分子表达有关。     

N-乙酰半胱氨酸对结肠癌细胞株H T-29生长及NF-κB p65信号通路的影响

目的探讨N-乙酰半胱氨酸（N-acetylcysteine,NAC）对人结肠腺癌HT-29细胞株增殖作用及NF-κB p65通路影响。方法采用MTT法测定NAC抗HT-29细胞增殖的量效和时效关系,采用免疫细胞化学法探讨对细胞增殖、凋亡及细胞核因子-ΚBp65（NF-κB p65）蛋白表达影响。结果模型对照组HT-29细胞增殖明显,不同剂量NAC对体外培养的结肠腺癌HT-29细胞增殖均具有明显抑制作用,呈剂量和时间依赖性;NAC在0.05-10 mmol.L^-1剂量下,均可使HT-29细胞凋亡率增加,增殖细胞核抗原（PCNA）表达减弱;NF-κB p65蛋白表达均逐渐降低。结论NAC具有HT-29细胞生长抑制作用,机制可能与阻断NF-κB p65通路,抑制氧化损伤有关。     

N-乙酰半胱氨酸对结肠癌细胞株H T-29生长及NF-κB p65信号通路的影响

目的探讨N-乙酰半胱氨酸（N-acetylcysteine,NAC）对人结肠腺癌HT-29细胞株增殖作用及NF-κB p65通路影响。方法采用MTT法测定NAC抗HT-29细胞增殖的量效和时效关系,采用免疫细胞化学法探讨对细胞增殖、凋亡及细胞核因子-ΚBp65（NF-κB p65）蛋白表达影响。结果模型对照组HT-29细胞增殖明显,不同剂量NAC对体外培养的结肠腺癌HT-29细胞增殖均具有明显抑制作用,呈剂量和时间依赖性;NAC在0.05-10 mmol.L^-1剂量下,均可使HT-29细胞凋亡率增加,增殖细胞核抗原（PCNA）表达减弱;NF-κB p65蛋白表达均逐渐降低。结论NAC具有HT-29细胞生长抑制作用,机制可能与阻断NF-κB p65通路,抑制氧化损伤有关。     

藏药湿生扁蕾提取物通过NF-κB通路诱导结肠癌细胞凋亡的机制研究

目的探讨藏药湿生扁蕾提取物通过NF-κB信号通路诱导结肠癌SW480细胞凋亡的作用及其机制。方法本研究用不同浓度的藏药湿生扁蕾提取物处理结肠癌SW480细胞,通过JC-1染色检测SW480细胞线粒体膜电位的变化,通过Hoechst染色以判断藏药湿生扁蕾提取物是否具有诱导结肠癌细胞SW480细胞凋亡效应。同时检测NF-κB蛋白的表达,用以明确NF-κB信号通路在结肠癌发生中的作用机制。结果经一定浓度的湿生扁蕾提取物处理后的SW480细胞内,NF-κB的表达明显下调,染色现象揭示湿生扁蕾提取物具有促进肿瘤细胞凋亡的作用。结论湿生扁蕾提取物可以在体外诱导肿瘤细胞凋亡,其抗肿瘤机制是通过NF-κB信号通路介导的。     

岩大戟内酯B通过阻断PI3K/Akt/NF-κB通路抑制结肠癌细胞的增殖和转移

目的:研究岩大戟内酯B(JB)对结肠癌HT-29细胞增殖和转移的抑制作用及其作用机制。方法:用不同浓度JB处理HT-29细胞,采用MTT法检测细胞增殖率;平板克隆实验检测细胞克隆形成率;流式细胞仪检测细胞周期变化;划痕实验分析细胞的迁移能力;Transwell小室实验研究细胞的侵袭能力;免疫荧光法和Western blotting法检测E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、波形蛋白vimentin、锌指蛋白(Snail)1、Snail2、基质金属蛋白酶(MMP)-2和MMP-9蛋白的表达;Western blotting法检测p-PI3K、PI3K、p-Akt、Akt、NF-κB P65、p-NF-κB P65蛋白表达水平。100μg/L IGF-1组和100μg/L IGF-1+20μmol/L JB组分别处理HT-29细胞,Western blotting法检测PI3K/Akt/NF-κB通路相关蛋白表达变化。结果:JB抑制HT-29细胞增殖作用浓度依赖性,其作用24 h的IC 50为52.68μmol/L;JB呈浓度依赖性地降低HT-29细胞的克隆形成率(P<0.05);与对照组相比,JB处理后的HT-29细胞G0/G1期比例显著增高,S期细胞比例明显下降;JB可显著抑制HT-29细胞的体外迁移、侵袭能力(P<0.05);JB作用后的HT-29细胞E-cadherin蛋白水平升高,vimentin、Snail1、Snail2、N-cadherin、MMP-2、MMP-9、p-PI3K、p-Akt、p-NF-κB P65蛋白表达水平显著降低(P<0.05);IGF-1+JB组p-PI3K、p-Akt、与p-NF-κB P65蛋白的表达水平较IGF-1组显著下降(P<0.05)。结论:JB在体外能抑制HT-29细胞增殖,诱导细胞在G0/G1期阻滞,抑制HT-29迁移和侵袭,调控上皮-间质转化(EMT)及MMPs,其机制可能与阻断PI3K/Akt/NF-κB通路有关。     

Genistein对结肠癌作用的研究

目的:探讨Genistein对结肠癌的作用。方法:采用光学显微镜和倒置显微镜观察Genistein对结肠癌细胞株HT-29生长的影响,并通过免疫细胞化学染色检测环氧化酶-2(COX-2)、bax蛋白的表达。结果:Genistein在25μg/m L和50μg/m L作用48h后,对HT-29细胞生长均有抑制作用,凋亡率均较对照组显著增加(P均0.01),并呈剂量依赖性;COX-2蛋白表达较对照组明显下降(P均0.01),而bax蛋白则较对照组明显增加(P均0.01),呈剂量依赖性。结论:Genistein既可以抑制HT-29细胞的增殖,又可以诱导细胞凋亡,其机制可能与其上调bax蛋白以及下调COX-2蛋白的表达有关。     

NF-κB/IκB在二苯乙烯苷抑制过氧化氢诱导内皮细胞凋亡中的表达变化

目的探讨二苯乙烯苷(TSG)对过氧化氢(H2O2)诱导人脐静脉内皮细胞凋亡及对核因子κB(NF-κB)、NF-κB抑制因子(IκB)基因表达的影响。方法体外培养人脐静脉内皮细胞,实验分为对照组、H2O2组、TSG组,采用Ho-echst 33258染色观察细胞凋亡形态,MTT法检测细胞增殖率,流式细胞术检测细胞凋亡率,RT-PCR检测NF-κB与IκB mR-NA表达,Western blot检测NF-κB p65、IκB蛋白表达。结果与对照组比较,H2O2组凋亡细胞数增多,细胞凋亡率增加,细胞增殖降低;NF-κB mRNA和蛋白表达增加,IκB mRNA和蛋白表达降低,差异均有显著性(P<0.01)。经TSG预处理后,细胞的增殖率较H2O2组增加,细胞凋亡率减少;NF-κBmRNA和蛋白表达减少,IκB mRNA和蛋白表达增加(P<0.01)。结论二苯乙烯苷能抑制H2O2诱导的人脐静脉内皮细胞凋亡,其作用机制可能与调节NF-κB/IκB表达有关。     

原花青素二聚体B_2对大鼠滑膜细胞NF-κB核转运及炎症因子表达的影响

目的通过观察原花青素二聚体B2(procyanidins di-mer B2,PCB2)对大鼠滑膜细胞NF-κB核转运及相关炎症因子表达的影响,探讨其抗炎的分子机制。方法免疫荧光法观察NF-κB/p65在细胞中的定位,RT-PCR检测PCB2对诱导细胞的COX-2 mRNA表达,Western blot分析COX-2蛋白含量变化,ELISA测定各处理组细胞上清液中IL-1β、VEGF的含量变化。结果 TNF-α(10μg.L-1)诱导RSC-364细胞NF-κB从细胞质转运至细胞核,50μmol.L-1 PCB2明显抑制NF-κB/P65核转运;PCB2剂量依赖性抑制COX-2基因和蛋白的表达;PCB2下调了TNF-α诱导的IL-1β、VEGF的水平。结论 PCB2能有效抑制COX-2、IL-1β及VEGF的表达,其机制可能与抑制TNF-α诱导的NF-κB核转运,抑制NF-κB活化有关。     

6，8- 二- 三氟甲基-5- 羟基-7- 乙酰氧基白杨素的抗胃癌作用

目的研究6,8-二-三氟甲基-5-羟基-7-乙酰氧基白杨素（dFMAChR）的体外抗胃癌作用。方法体外培养人胃癌SGC-7901细胞。MTT比色法测定细胞活性。PI染色流式细胞术（FCM）分析细胞凋亡率。WesternBlot检测细胞NF-κB、Bcl-2、Bax蛋白表达。结果 dFMAChR显著抑制体外培养人胃腺癌SGC-7901细胞活性,呈剂量依赖性;dFMAChR有效诱导人胃腺癌SGC-7901细胞凋亡;dFMAChR下调NF-κB（p65）、Bcl-2蛋白表达,同时,上调Bax蛋白表达,呈浓度依赖性。结论 6,8-二-三氟甲基-5-羟基-7-乙酰氧基白杨素具有抗胃癌作用,其机制可能与其抑制NF-κB活化、下调Bcl-2蛋白表达和上调Bax蛋白表达相关。     

Combination of cyclooxygenase-2 inhibitors and oxaliplatin increases the growth inhibition and death in human colon cancer cells

The cyclooxygenase-2 (COX-2) protein is highly expressed in a variety of human cancers and has been reported to promote tumor growth. Non-steroidal anti-inflammatory drugs such as etodolac and celecoxib have been shown to inhibit COX-2 activity and may play a role in the chemoprevention of cancer. Oxaliplatin is a third-generation platinum compound that exhibits a different spectrum of activity compared with cisplatin. Other cisplatin-resistant tumors can still respond to oxaliplatin. However, the anticancer ability of the combination of COX-2 inhibitors and oxaliplatin is still unknown. In this study, we investigated the effects of combination of COX-2 inhibitors and oxaliplatin on the cell growth and survival in human colon cancer cells. Treatments with etodolac (0.3-0.5 mM) or celecoxib (20-80 microM) for 24 h concentration-dependently induced the cytotoxicity in the RKO colon carcinoma cells. Etodolac and celecoxib did not alter the COX-2 protein levels but inhibited its enzyme activity to reduce prostaglandin E2 production. Furthermore, the cell survival was concentration-dependently decreased following oxaliplatin (1-100 microM, 24 h) treatment. Combination of oxaliplatin and etodolac additively increased the death and growth inhibition of RKO cells. Survivin, an inhibitor protein of apoptosis, mediates anti-apoptosis and promotes cell division in cancer cells. Oxaliplatin or COX-2 inhibitors significantly decreased the levels of survivin proteins. Moreover, survivin proteins were markedly diminished following co-treatment with oxaliplatin and etodolac. Together, this is the first report that combination of COX-2 inhibitors and oxaliplatin can increase the reduction of survivin protein expression, growth inhibition, and death in human colon cancer cells.     

Somatostatin inhibits colon cancer cell growth through cyclooxygenase-2 downregulation

Background and purpose:Cyclooxygenase-2 (COX-2) is expressed in colonic neoplasms, where it supports cell proliferation via prostaglandin E(2) (PGE(2)) production. This study investigated the effects of somatostatin-14 on COX-2 expression, PGE(2) production and proliferation in colon cancer cells.Experimental approach:Human colon adenocarcinoma cell lines Caco-2, HT-29 and HCT116 were used. The following techniques were employed: colourimetric assay for cell growth; 5-bromo-2'-deoxyuridine assay for DNA synthesis; enzyme immunoassay for PGE(2); COX-2 mRNA silencing; RT-PCR or Western blot for somatostatin receptor subtypes, cyclooxygenase isoforms, phosphorylated-ERK-1/ERK-2 and phosphorylated-Akt.Key results:HT-29 and Caco-2 cells expressed COX-2 and somatostatin receptors (sst(3/4/5) and sst(3/5), respectively). HCT116 cells did express somatostatin receptors (sst(2/3/5)), but not COX-2. Somatostatin-14 inhibited basal COX-2 expression, PGE(2) production, DNA synthesis and growth in Caco-2 cells and these effects were prevented by BN81658 (sst(3) receptor antagonist). Basal proliferation of HT-29, HCT116 and COX-2-silenced Caco-2 cells was not affected by somatostatin-14. Stimulation of HT-29 cells with gastrin-17 elicited increments of ERK-1/ERK-2 and Akt phosphorylation, COX-2 expression, PGE(2) production, DNA synthesis and cell growth, which were all counteracted by somatostatin-14. Somatostatin-14-induced inhibition of COX-2 expression, PGE(2) production and DNA synthesis were blocked by BIM23056 (sst(5) receptor antagonist).Conclusions and implications:Somatostatin decreases COX-2 expression and function in colon cancer cells via activation of sst(3) or sst(5) receptors, and these effects contribute to the inhibitory action of somatostatin on cell proliferation. These findings can be relevant to the development of therapeutic strategies based on the modulation of the COX-2 pathway.British Journal of Pharmacology (2008) 155, 198-209; doi:10.1038/bjp.2008.268; published online 30 June 2008.     

一种选择性环氧化酶2—抑制剂JTE—522抑制RL95—2细胞的增殖及诱导其凋亡

目的:探讨环氧化酶-2抑制剂JTE-522是否对人子宫内膜癌细胞株RL95-2细胞有抑制增殖和诱导凋亡的作用及其分子机理.方法:应用体外噻唑兰法、琼脂糖凝胶电泳、酶联免疫试验、流式细胞术、RT-PCR及Western blot等方法研究JTE-522对RL952细胞增殖和凋亡的作用及其分子机理.结果:JTE522抑制RL95-2细胞的增殖、诱导其凋亡、引起G_0/G_1期阻滞和 S期抑制,并伴有COX-2 mRNA、磷酸化 Rb、CDK4蛋白表达的抑制及 p53,p21和cyclin D_1蛋白表达水平的上调.另外,细胞经 JTE-522处理后,还可见caspase-3活性的增加.结论:JTE-522抑制RL95-2细胞的增殖及诱导其凋亡,可能与COX-2mRNA,磷酸化Rb、CDK4蛋白水平的下降及 p53,p21和 cyclin D_1蛋白表达的上调有关,还可能与caspase-3的激活有关.     

Induction of apoptosis by Panduratin A isolated from Kaempferia pandurata in human colon cancer HT-29 cells

We previously showed that panduratin A isolated from an extract of Kaempferia pandurata (Zingiberaceae) was a strong inhibitor of cyclooxygenase-2 (COX-2) in RAW264.7 cells, suggesting a potential use of panduratin A as an anti-inflammatory agent. In the present study, we have investigated the effects of panduratin A on cytoplasmic levels of COX-2, as well as proliferation and apoptosis in human colon cancer cells HT-29. Cell proliferation and induction of apoptosis was determined by the MTT assay, DNA fragmentation measurement, flow cytometric analysis, nuclear staining and Western blotting. The MTT assay indicated that panduratin A exhibited cytotoxicity with an IC50 value of 28 microM. The cytotoxic effects of panduratin A were found to be accompanied by the dose-dependent induction of apoptosis as assessed by DNA fragmentation and apoptotic bodies. In addition, treatment with an apoptosis-inducing concentration of panduratin A resulted in cleavage of poly(ADP-ribose) polymerase (PARP) with a concomitant decrease in procaspase-3 protein. Our study provides evidence for cell growth inhibition and induction of apoptosis by panduratin A in human colon cancer cells, suggesting its potential use as a cancer chemopreventive and therapeutic agent.     

Oxidative stress and cyclooxygenase-2 induction mediate cyanide-induced apoptosis of cortical cells

Cyanide (KCN)-induced generation of reactive oxygen species (ROS) involves cyclooxygenase-2 (COX-2)-mediated reactions in some neurons. The present study examines the extent to which COX isoforms are involved in KCN-induced apoptotic cell death processes of cultured cortical cells. After treatment with KCN (10-300 microM), COX-2 was expressed in a time- and concentration-dependent manner increasing markedly over a 4-h period. However, no significant changes were observed in COX-1 levels at any cyanide concentration. Correlated with COX-2 up-regulation, KCN induced a time-dependent apoptotic death. TUNEL staining showed that the COX-2 inhibitor NS-398 (30 microM) blocked KCN-induced apoptosis, whereas the selective COX-1 inhibitor valeryl salicylate did not affect the level of apoptotic cell death. Exposure of cells to KCN (300 microM) for 24 h resulted in DNA fragmentation, which was also reduced by NS-398. Prostaglandin E(2) (PGE(2)) accumulation in cell culture supernatants was increased by KCN and NS-398 blocked PGE(2) generation. PCR studies further confirmed that COX-2 expression was increased by KCN. Antioxidants phenyl-N-test-butylnitrone, superoxide dismutase, and catalase significantly inhibited KCN-induced COX-2 up-regulation and subsequent apoptosis. N(G)-nitro-L-arginine methylester an inhibitor of nitric oxide synthase, blocked KCN-induced PGE(2) production and apoptosis, but not COX-2 expression. Increased nitric oxide levels caused by cyanide may directly activate the COX-2 enzyme. These data show that cyanide treatment of cortical cells involves increased COX-2 expression, PGE(2) accumulation, and ROS generation, resulting in apoptotic cell death.     

Ginseng saponin metabolite induces apoptosis in MCF-7 breast cancer cells through the modulation of AMP-activated protein kinase

Previous studies have shown that the ginseng saponin metabolite, Compound K (20-O-d-glucopyranosyl-20(S)-protopanaxadiol, IH901), suppresses proliferation of various cancers and induces apoptosis. AMP-activated protein kinase (AMPK) is a sensor of cellular energy states and is involved in apoptosis of cancer cells. We hypothesized that Compound K may exert cytotoxicity in MCF-7 human breast cancer cells through modulation of AMPK, followed by a decrease in cyclooxygenase-2 (COX-2) expression. Compound K inhibited cell growth, induced apoptosis via generation of reactive oxygen species (ROS), as well as decreasing COX-2 expression and prostaglandin E(2) (PGE(2)) levels. These effects of Compound K were induced via an AMPK-dependent pathway and were abrogated by a specific AMPK inhibitor. These results suggest that Compound K induced apoptosis by modulating AMPK-COX-2 signaling in MCF-7 human breast cancer cells.     

Interruption of hepatocyte growth factor signaling augmented oridonin-induced death in human non-small cell lung cancer A549 cells via c-met-nuclear factor-κB-cyclooxygenase-2 and c-Met-Bcl-2-caspase-3 pathways

The aim of this study was to elucidate the molecular mechanisms mediating hepatocyte growth factor (HGF)-induced protection against oridonin-induced apoptosis in A549 cells. Oridonin induced decrease in Bcl-2/Bax ratio and activation of caspase-3, while these processes were reversed by HGF, suggesting that HGF played an anti-apoptotic role in oridonin-induced A549 cell death. HGF-induced protective effect was partially attributed to the activation of nuclear factor (NF)-κB and cyclooxygenase 2 (COX-2), since the protective effect was abolished by inhibition of NF-κB or interruption of COX-2. Then the activated COX-2 could prevent cells from initiating the apoptotic response by promoting prostaglandin E? (PGE?) release. Activation of NF-κB-COX-2 by HGF-treatment triggered the increase in Bcl-2/Bax ratio, inhibition of procaspase-3 cleavage, promotion of Ca2?-independent intracellular phospholipase A2 (iPLA2) expression and augmentation of PGE? release, leading to antagonizing oridonin-induced cell death in A549 cells. HGF-induced cell survival in response to oridonin administration was associated with the activation of c-Met-NF-κB-COX-2 and c-Met-Bcl-2-caspase-3 signaling pathways. iPLA2, downstream effector of caspase-3, also participated in these processes.     

Cyclooxygenase-2 (COX-2)-dependent and -independent anticarcinogenic effects of celecoxib in human colon carcinoma cells

Celecoxib, a selective cyclooxygenase-2 (COX-2) inhibitor, is the only non-steroidal anti-inflammatory drug so far which has been approved by the FDA for adjuvant treatment of patients with familial adenomatous polyposis. The molecular mechanism responsible for the anticarcinogenic effects of celecoxib is still not fully understood. To investigate the extent to which the anticarcinogenic effect of celecoxib depends on COX-2 expression, we transfected human colon carcinoma cells (Caco-2) with the human COX-2 cDNA, in both sense and in antisense orientation, to generate cells which either overexpress COX-2 (human COX-2-sense, hCOX-2-s), express no COX-2 (human COX-2-antisense, hCOX-2-as) or express only very small amounts of COX-2 (control cells). Treatment of these cells with celecoxib dose-dependently (0-100microM) reduced cell survival which was accompanied by an induction of a G(0)/G(1) phase block and apoptosis. The effect of celecoxib treatment on both, cell survival and induction of apoptosis in hCOX-2-as cells was less marked than in the COX-2-expressing cells. Apoptosis was accompanied by an activation of caspase-3 and caspase-9 and cytochrome c release. In contrast, we observed no difference in sensitivity with regard to the induction of a cell cycle block between the different cell clones. The G(0)/G(1) phase block caused by celecoxib correlated with a decrease in expression levels of cyclin A and cyclin B1 and an increase in the expression of the cell cycle inhibitory proteins p21(Waf1) and p27(Kip1) irrespective of the type of cell used. These data indicate that apoptosis-inducing effects of celecoxib partly depend on COX-2 expression of the cells, whereas induction of a cell cycle block occurred COX-2 independently. Thus, the anticarinogenic effects of celecoxib can be explained by both COX-2-dependent and -independent mechanisms.     

全反式维甲酸联合阿司匹林对体外抑制肺腺癌细胞株A549增殖和促凋亡的作用及其机制

目的：观察全反式维甲酸（ATRA）联合阿司匹林（ASA）体外抑制肺癌A549细胞增殖,促凋亡作用和机制。方法：体外培养人肺腺癌A549细胞,5,10 μmol·L^-1的ATRA单独及分别联合5,10 μmol·L^-1的ASA进行干预48 h、72 h后,MTT法检测细胞增殖抑制率;TUNEL法观测药物作用48 h后细胞凋亡状态;RT-PCR法检测药物作用后肺腺癌A549细胞COX-2 mRNA的表达;Western blot法检测凋亡相关因子Bax、Bcl-2、COX-2和caspase-3蛋白的表达。结果： ATRA与ASA联用对A549增殖具有协同作用;TUNEL法结果显示ATRA可诱导A549细胞凋亡,与ASA联用凋亡率显著升高（P<0.05）;RT-PCR显示A579细胞中COX-2 mRNA呈现高表达状态,ASA可下调COX-2表达,ATRA无此作用;Western blot结果显示ATRA和ASA协同作用使A549细胞中Bcl-2、COX-2蛋白表达受到抑制,Bax蛋白表达增加,Bcl-2/Bax值降低,对凋亡通路的影响大于单药作用（P<0.05）。结论： ASA联合ATRA可协同抑制肺腺癌细胞A549的增殖及以及促进其发生凋亡,其作用机制可能是ASA通过抑制COX-2蛋白表达,与ATRA共同通过Bcl/caspase通路诱导肿瘤凋亡实现的。