Low Dose Hyper-radiosensitivity in Human Lung Cancer Cell Line A549 and Its Possible Mechanisms

The low dose hyper-radiosensitivity （HRS） in human lung cancer cell line A549 was investigated, the changes of ATM kinase, cell cycle and apoptosis of cells at different doses of radiation were observed, and the possible mechanisms were discussed. A549 cells in logarithmic growth phase were irradiated with ^60Co y-rays at doses of 0-2 Gy. Together with flow cytometry for precise cell sorting, cell survival fraction was measured by means of conventional colony-formation assay. The expression of ATM1981 Ser-P protein was examined by Western blot 1 h after radiation. Apoptosis was detected by Hoechst 33258 fluorescent staining, and Annexin V-FITC/PI staining flow cytometry 24 h after radiation. Cell cycle distribution was observed by flow cytometry 6, 12 and 24 h after radiation. The results showed that the expression of ATM1981Ser-P protein was observed at 0.2 Gy, followed by an increase at 〉0.2 Gy, and reached the peak at 0.5 Gy, with little further increase as the dose exceeded 0.5 Gy. Twenty-four h after radiation, partial cells presented the characteristic morphological changes of apoptosis, and the cell apoptosis curve was coincident with the survival curve. As compared with control group, the cell cycle almost had no changes after exposure to 0.1 and 0.2 Gy radiation （P〉0.05）. After exposure to 0.3, 0.4 and 0.5 Gy radiation, G2/M phase arrest occurred 6 and 12 h after radiation （P〈0.05）, and the ratio of G2/M phase cells was decreased 24 h after radiation （P〈0.05）. It was concluded that A549 cells displayed the phenomenon of HRS/IRR. The mode of cell death was mainly apoptosis. The activity of ATM and cell cycle change may take an important role in HRS/IRR.

染料木素对非小细胞型肺癌A549/DDP细胞增殖和凋亡的影响

目的:观察染料木素(genistein)对人非小细胞型肺癌(non small cell lung cancer,NSCLC)A549/DDP细胞增殖和凋亡的影响。方法:培养A549及A549/DDP细胞株,以A549细胞为对照。①MTT法测定A549及A549/DDP细胞对顺铂的IC50值、耐药倍数及细胞增殖抑制率;②测定0、1.25、2.5、5.0、10、20、40、60、80μg/ml染料木素作用48 h对A549/DDP细胞增殖的抑制率及IC50值;③用6.25、12.5、25μg/ml染料木素处理A549/DDP细胞24 h后,经流式细胞计量仪检测细胞周期及细胞凋亡情况。结果:①A549及A549/DDP细胞对顺铂的IC50值分别为33.6μmol/L和76.9μmol/L,耐药倍数为2.3;细胞增殖抑制率随顺铂浓度增加而逐渐加大;②染料木素对A549/DDP细胞生长的影响,随染料木素浓度增加表现为先促增殖后抑制的作用,其对A549及A549/DDP细胞的IC50值分别为85.1μg/ml和80.2μg/ml;③6.25、12.5、25μg/ml染料木素作用于A549/DDP细胞24 h后,随染料木素浓度的增加,停留于G2/M期的细胞数逐渐增多(P<0.05),同时A549/DDP细胞出现凋亡。结论:染料木素可抑制A549/DDP细胞的生长,将细胞阻滞于G2/M期,并诱导细胞凋亡。

补中益气汤含药血清对A549/DDP细胞生长周期作用的影响

目的评估补中益气汤含药血清对A549/DDP细胞生长周期的影响效果。方法体外培养人肺腺癌A549/DDP细胞,实验分组为:空白对照组,补中益气汤组和脾细胞处理组。用不同浓度的补中益气汤含药血清和脾细胞刺激A549/DDP细胞,采用MTT法(Methylthiazolyldiphenyl-tetrazolium bromide,MTT)测定2种方法对细胞的直接杀伤作用;流式细胞术检测2种方法对细胞凋亡的影响;荧光显微镜观察2种方法对凋亡小体产生的影响。结果MTT法显示同空白对照组相比,补中益气汤含药血清对细胞生长均有抑制作用(P<0.05),且该法同脾细胞作用后效果类似;2种方法处理后,流式细胞术均可见特征性的细胞凋亡峰;在荧光显微镜下可见凋亡细胞。结论补中益气汤含药血清在体外能阻滞A549/DDP细胞的生长增殖,诱导该细胞发生凋亡,且效果同脾细胞类似。

EXPRESSION AND REVERSION OF DRUG RESISTANCE-AND APOPTOSIS-RELATED GENES OF A DDP-RESISTANT LUNG ADENOCARCINOMA CELL LINE

Objective: To investigate the co-expression of drug resistance- and apoptosis-related genes of cisplatin (CDDP)-selected lung adenocarcinoma cell line A 549 DDP for compared to the parental cell line A549, and reverse of drug resistance by antisense s-oligodeoxynucleotides (S-ODNs) of differentially expressed genes. Methods: Sense and antisense S-ODN were transferred into A 549 DDP cells by lipofectin. The expression of drug resistance and apoptosis related genes was examined by RT-PCR, immunocytochemistry and flow cytometry, respectively. Apoptostic cells were identified by DNA electrophoresis and terminal deoxynucleotidyl transferase (TdT)-mediated biotin dUTP nick end-labeling(TUNEL). Drug resistance of tumor cells was detected by a cell viability (MTT) assay. Results: The expression of bcl-2 was positive and that of multidrug resistance-associated protein (MRP) at mRNA and protein level was increased in A 549 DDP compared to A549 cells. MDR1, c-myc and topoisomeras II (TOPO II) were similarly co-expressed in two cell lines. Both cell lines were negative for c-erbB-2 expression. In A 549 DDP cells, the expression of bcl-2 and MRP was significantly inhibited by their respective antisense S-ODNs. Antisense S-ODNs could also decrease significantly drug resistance of A 549 DDP cells to CDDP by promoting cell apoptosis. Conclusion: Both intrinsic and acquired drug resistance were involved in co-expression of multiple MDR-related genes in lung adenocarcinoma. Cooperation of bcl-2 and MRP genes appeared to play an important action to confer the resistance of A 549 DDP cells to CDDP. Their antisense S-ODNs are responsible for the decrease of drug resistance of this cell line by promoting apoptosis.

The Inhibitory Effects of Rh-endostatin(YH-16) in Combination with Radiotherapy on Lung Adenocarcinoma A549 in Mice and the Underlying Mechanisms

In order to investigate the inhibitory effects of Endostar(rh-endostatin,YH-16)in combination with radiotherapy on lung adenocarcinoma A549 in mice and the interaction mechanisms of combined therapy,the transplantation tumor models of A549 lung adenocarcinoma were established.When the largest diameter of tumor reached 1.0cm,all nude mice were randomly divided into 4 groups:Endostar group,radiotherapy group,radiotherapy plus Endostar(combined treatment)group,and control group(n=6 in each group).The largest d...

Antineoplastic effects of deoxyelephantopin,a sesquiterpene lactone from Elephantopusscaber, on lung adenocarcinoma (A549) cells

OBJECTIVE： Deoxyelephantopin, a sesquiterpene lactone from Elephantopus scaber, showed inhibition of the growth of various tumor cells in vitro. In the present study, we investigated the cytotoxicity and apoptosis-inducing capacity of deoxyelephantopin on lung adenocarcinoma （A549） cells. METHODS： The cytotoxic effect of deoxyelephantopin on A549 cells and normal lymphocytes was evaluated using 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay and 50% inhibitory concentration （IC50） value was determined. The self-renewal and proliferating potential of A549 cells after treatment with deoxyelephantopin were examined by colony formation assay. Cellular morphology of deoxyelephantopin-treated cells was observed using phase- contrast microscopy. The induction of apoptosis was evaluated using acddine orange and ethidium bromide staining, Hoechst 33342 staining, terminal deoxynucleotidyl transferase-mediated dUTP biotin nick end-labeling （TUNEL） assay, DNA fragmentation analysis and Annexin V-fluorescein isothiocyanate staining by flow cytometry. Activation of caspases was detected using fluorogenic substrate specific to caspases 2, 3, 8 and 9 and flow cytometric analysis. The total cellular DNA content and expression of cleaved poly （ADP-ribose） polymerase was also analyzed. RESULTS： Deoxyelephantopin exhibited cytotoxicity to A549 cells （IC50 = 12.287 μg/mL）, however, there was no toxicity towards normal human lymphocytes. Deoxyelephantopin suppressed the colony-forming ability of A549 cells in a dose-dependent manner. Acridine orange, ethidium bromide and Hoechst 33342 staining showed cell shrinkage, chromosomal condensation and nuclear fragmentation, indicating induction of apoptosis. Deoxyelephantopin increased apoptosis of A549 cells, as evidenced by more TUNEL-positive cells. DNA fragmentation and Annexin V staining revealed late-stage apoptotic cell population. Deoxyelephantopin inhibited A549 cell growth by cell cycle arrest at G2/M phase and induced apoptosis through both extrinsic and intrinsic pathways. CONCLUSION： These results suggest that deoxyelephantopin has great potential as a new chemotherapeutic agent to be developed further for the treatment of lung cancer.

Enhanced cytotoxic effect on human lung carcinoma cell line(A549) by gold nanoparticles synthesized from Justicia adhatoda leaf extract

Objective: To synthesize bio-inspired gold nanoparticles(AuNPs) using the leaf extract of Justicia adhatoda and evaluate the anti-cancer activity on human lung cancer cell line(A549).Methods: Synthesis of AuNPs was done using an aqueous leaf extract of Justicia adhatoda as a green route. The bio-synthesized AuNPs were confirmed and characterized by using various spectral studies such as UV-Vis spectrum, Scanning Electron Microscope with EDAX, Transmission Electron Microscope, Fourier Transmission Infrared Spectroscope analysis and Surface Enhanced Raman Spectroscopy. The cell viability was determined by MTT reduction assay. In addition, cytomorphology and the nuclear morphological study of A549 cell line was observed under fluorescence microscope. Results: UV-Vis spectrum showed surface plasmon resonance peak at 547 nm, scanning electron microscope and transmission electron microscope studies showed the monodispersed spherical shape and its average size in the range of 40.1 nm was noticed. Fourier Transmission Infrared Spectroscope analysis confirmed that the C=O group of amino acids of proteins had strong ability to bind with the surface of nanoparticle. Interestingly, our results also demonstrated inhibited proliferation of A549 cell line by MTT(IC50 value: 80 μg/mL). Cell morphology was observed and cell death was caused by apoptosis as revealed by propidium iodide staining. Conclusions: The current study proves the anticancer potential of bio-synthesized AuNPs. Thus, synthesized AuNPs can be used for the treatment of human lung cancer cell(A549) and it can be exploited for drug delivery in future.

TIME-AND DOSE-DEPENDENT UP-REGULATION OF TNF-α mRNA AFTER IRRADIATION OF HUMAN NSCLC CELL LINES IN VITRO

Objective： Even though radiotherapy plays a major role in the local treatment of non-small cell lung cancer （NSCLC）, little is known about the molecular effects of irradiation in this tumor. In the present study, we examined two NSCLC cell lines for their endogenous production of TNF-α after irradiation. To investigate the radiation-induced TNF-α production in NSCLC cell lines. Methods： Two human NSCLC cell lines （A549： squamous; NCI-H596： adenosquamous） were investigated for their TNF-α mRNA （real-time RT-PCR） after exposure to different irradiation doses （2, 5, 10, 20, 30, 40 Gy） and time intervals （1, 3, 6, 12, 24, 48 or 72 h）. The TNF-α mRNA expression was quantified by real-time RT-PCR. The clonogenic survival was evaluated after irradiation with 2, 4, 6 and 8 Gy. Results： Non-irradiated NSCLC cells exhibited no or very low TNF-α expression. For the NCI-H596 cell line, TNF-α expression was significantly elevated 1～12 h （maximum 6h： 568fold increase relative to unirradiated cells） in a time-dependent manner. The radiation-induced increase could be observed after irradiation with 2 Gy reaching maximal at 40 Gy, with 83 times higher than normal controls. The clonogenic survival of these cell lines was nearly identical. Conclusion： NCI-H596 cells produce significant quantities of TNF-α following irradiation in a time- and dose-dependent manner. The pro-inflammatory cytokine TNF-α is a key mediator for the pathogenesis of radiation pneumonitis. Radiation-induced endogenous TNF-α expression in NSCLC cells may affect the normal lung adjacent to the tumor and may be associated with an adverse clinical outcome of the patient.

三氧化二砷诱导A_(549)^(DDP)细胞株耐药基因表达的研究

目的：探讨三氧化二砷(As2O3）的耐药机制。方法：用四甲基偶氮唑蓝(MTT）法检测A_(549)^(DDP)细胞对As_2O_3的耐药性，用逆转录聚合酶链反应(RT－PCR）技术检测As_2O_3处理后A_(549)^(DDP) 细胞多药耐药基因(mdr1）及多药耐药相关蛋白(MRP）基因表达。结果：A_(549)^(DDP) 细胞对As_2O_3具有交叉耐药性。A_(549)和A_(549)^(DDP) 细胞中mdr1基因低表达，MRP基因呈较高水平表达。结论：A_(549)^(DDP) 细胞中MRP基因过度表达可能是As_2O_3耐药的主要机制之一。

IDENTIFICATION OF DRUG RESISTANT RELATED cDNA IN LUNG ADENOCARCINOMA CELL LINES

Objective: To clone multidrug resistance (MDR) related genes in lung adenocarcinoma cell lines. Methods: The differentially expressed cDNA fragments between A549 and A549 DDP cells were analyzed by mRNA differential display PCR(DD RT-PCR). The fragments thus obtained were further analyzed by DNA sequencing and Northern blotting. Results: Three differentially expressed cDNA fragments were obtained and confirmed by Northern blot. Sequence analysis revealed that two of them were novel and one was 100% identical with ICE gene. Conclusion: Analyzing differentially expressed fragment between A549 and A549 DDP cells may be helpful for finding new MDR related genes. The drug resistance of A549 DDP cells may be related to the inhibition or down-regulation of ICE gene.

A_(549)细胞免疫抑制因子及香菇多糖对T细胞增殖的影响

目的 :研究A54 9人肺腺癌细胞产生的免疫抑制因子及香菇多糖对T细胞转化的影响。方法 :以MTT法测定加A54 9细胞免疫抑制因子及香菇多糖后T细胞的转化率。结果 :T细胞的转化受该免疫抑制因子抑制 ,且抑制程度与免疫抑制因子浓度成正相关。适当浓度的香菇多糖能有效地拮抗此抑制。结论 :A54 9细胞产生的免疫抑制因子可抑制T细胞转化 。

二十碳五烯酸抑制肺腺癌A-549细胞株增殖

目的在体外细胞实验中,观察二十碳五烯酸(EPA)联合顺铂(DDP)对肺腺癌A-549细胞株的抗增殖和诱导凋亡作用。方法选用A-549细胞株进行体外培养,用MTT比色法测定EPA对A-549细胞株的抗增殖作用。应用倒置显微镜、光学显微镜观察细胞凋亡形态学变化。应用TUNEL染色法检测细胞凋亡指数(AI)。结果实验结果表明,EPA在(60～120)μg/mL浓度范围内,于24、48、72、96h四个时间段对肺腺癌A-549细胞株均有抑制生长作用,且EPA与顺铂有协同抗癌作用,并表现出浓度、时间依赖性关系。当EPA浓度为60、80、100、120μg/mL时,细胞凋亡指数(AI)依次升高,分别为(81.52±1.96)%、(83.74±2.21)%、(85.30±2.38)%、(86.26±2.44)%,不同浓度组相比差异有统计学意义(P<0.05)。结论体外实验中,EPA对A-549细胞生长有抑制作用,呈明显的量效和时效关系,且与顺铂有协同作用。

七叶苷对人肺腺癌细胞株A_（549）的生长抑制作用及其抗炎平喘机制的探讨

实验表明，七叶苷虽对体外培养的人肺腺癌细胞株Ａ＿（５４９）细胞的［３Ｈ］－ＴｄＲ及［３Ｈ］－ＵＲ参入无明显作用，但能够显著地抑制其［３Ｈ］－Ｌｅｕ参入，因而表明：七叶苷能在蛋白质翻译水平上抑制Ａ５４９细胞的生长。此外，本文结果表明七叶苷能够抑制Ａ５４９细胞脂加氧酶的表达，同时，七叶苷还能够直接抑制该细胞脂加氧酶的活性，七叶苷正是通过抑制脂加氧酶的合成表达及抑制脂加氧酶的活性这两方面的作用，降低脂加氧酶产物的生成量，从而发挥抗炎平喘的作用。

廿烷五烯酸对人肺癌A-549细胞株的凋亡作用及细胞周期的影响

[目的]观察廿烷五烯酸诱导人肺癌A-549细胞株的凋亡作用及其对A-549细胞周期的影响.[方法]用人肺癌A-549进行体外培养,分为对照组和小、中、大剂量廿烷五烯酸组,分别给予蒸馏水及15,30,60 mg/L廿烷五烯酸,培养48 h,观察细胞变化.对照组加入培养液500μL,实验步骤相同.应用FCM进行定量检测细胞凋亡并作细胞周期分析.[结果]对照组细胞培养48 h,凋亡率仅为0.14%±0.05%,未见亚二倍体峰;用15,30,60 mg/L廿烷五烯酸处理48 h时,细胞出现凋亡峰,凋亡率分别为10.50%±0.56%,19.87%±1.34%,30.12%±1.78%,不同质量浓度凋亡率间差异有统计学意义,廿烷五烯酸质量浓度在15～60 mg/L时,G0/G1期和G2/M期细胞百分比下降,S期细胞百分比上升,阻滞周期于S期.[结论]体外实验中,廿烷五烯酸通过干扰细胞周期抑制人肺癌A-549细胞的生长,主要阻滞于S期;抑制肿瘤细胞增殖可能是廿烷五烯酸抗肺癌作用的机制之一.

腺病毒41型致缺乏腺病毒E_1区的A_(549)细胞产生病变的实验研究

首次报道了腺病毒41型TaK株致缺乏腺病毒E1基因功能的A(549)细胞产生细胞病变。该病变与病毒感染的稀释度存在量一效关系。核酸杂交示1:10与1:20稀释度组病毒核酸含量相近，但明显高于1:50组。免疫荧光技术分析显示各稀释度组病毒蛋白表达起始时相均在病毒感染后的2～3d。

Study of ATP borate ester effects on cell sensitization to radiation emitted by a nuclear reactor

Adenosine triphosphate(ATP)borate ester as a new boron agent for boron neutron capture therapy was tested.It was synthesized via a dehydration reaction induced by heating adenosine triphosphate disodium with boric acid.Next,ATP borate ester pretreatments were assessed to study their effects on cell sensitization from exposure to thermal neutron irradiation emitted by a nuclear reactor.Using cell viability assays(CCK8),survival rates of A549 cells pretreated with or without boroncontaining agents,including ATP borate ester and 4-dihydroxyborylphenylalanine(BPA),were measured.One week after feeding an ATP borate ester solution to tumorbearing nude mice,elemental B content values of tumor muscle and blood were measured using inductively coupled plasma mass spectrometry(ICP-MS).Meanwhile,other tumor tissue samples were placed in a culture medium,subjected to a 3-min neutron irradiation exposure,and then fixed in formalin 24 h later for the terminaldeoxynucleotidyl transferase(TDT)-mediated d UTP nick end labeling(TUNEL)immunohistochemical staining analysis.Results showed that A549 cell irradiation sensitization(irradiation dose of 0.33 Gy)varied with pretreatment.Sensitization values of the ATP borate ester pretreatment group were 1.3–14.1 with boron agent concentrations of 0.3–4.5 mM.Within 1.1–3.4 mM,ATP borate ester showed significantly higher sensitization values than BPA.Meanwhile,TUNEL results demonstrated that apoptosis rates of tumor tissue cells exposed to irradiation after ATP borate ester pretreatment significantly exceeded the corresponding rates for BPA-pretreated cells.In animal experiments,although the distribution ratio of ATP borate ester(tumor tissue/normal muscle,T/N)of 1.2 was not significantly different compared with that of BPA(1.3),the total ATP borate ester concentration in the tumor tissue(0.79±0.05μg/g)significantly exceeded that of BPA(0.58±0.05μg/g).Thus,compared with BPA,the greater enrichment of ATP borate ester in tumor tissues permits preferential targeting toward tumor cells for radiation sensitization.Therefore,ATP borate ester is superior to BPA for use in boron neutron capture therapy.

Synthesis, Characterization and Biological Screening of Ferulic Acid Derivatives

According to WHO, cancer is a leading cause of death worldwide, accounting for 8.2 million deaths in 2012. Among several factors involved in the pathogenesis of cancer, free radical formation followed by damage to DNA and cell protein is one of the causes. Natural plant products have gained enormous interest in the prevention or treatment of chronic diseases. Ferulic acid, like other phenolic acids (caffeic acid, sinapic acid) possess anti cancer activity. A series of ferulic esters (FE1 - FE11) and ferulic amides (FA1 - FA10) were synthesized and evaluated for their cytotoxic activity.

SRS27,a semisynthetic diterpenoid lactone,inhibits airway inflammation and hyper-responsiveness via NF-κB pathway in an allergic mouse asthma model

Andrographis paniculata contains two main diterpenoid constituents,andrographolide(AGP)and 14-deoxy-11,12-didehydroandrographolide(DDAG),which were found to exhibit antiasthma effects in a mouse asthma model.However,due to inadequacies of both compounds in terms of drug-likeness,DDAG analogues were semisynthesised to tackle these shortcomings.The objective of the study was to investigate the potential of DDAG analogues as new antiasthma agents.Among the analogues,(SRS27)was proven to inhibit cysteinyl leukotrienes(CysLT)and nitric oxide(NO)synthesis in mouse macrophages,like AGP.DDAG,on the other hand,failed to exhibit such activities.SRS27 is less cytotoxic than AGP,suggests that a simple chemical modification of DDAG produces a compound with CysLT and NO inhibitory activites similar to AGP while maintaining toxicity profile similar to DDAG.It is interesting to note that other analogues such as SRS28,SRS49,SRS76 and SRS83 with chemical modifications on the same carbon numbers 3 and 19 of DDAG were unable to show inhibition of CysLT and NO synthesis.Consequently,the potential anti-inflammatory effect of SRS27 was investigated in ovalbumin(OVA)-induced mouse asthma model.The compound was administered in a prophylactic manner and showed a substantial decrease in mouse asthma model parameters.SRS27 at 3mg·kg-1 significantly reduced OVA-induced total cell such as macrophages,eosinophils,lymphocytes and neutrophils,as well as inflammatory cytokines such as IL-4,IL-5,IL-13 and eotaxin in bronchoalveolar lavage BAL fluid.The compound also suppressed serum IgE production.In addition,SRS27 suppressed mucus hyper-secretion and expression of inflammatory mediators such as TNF-α,MCP-1,Muc5 ac,RANTES,IL-33 and iNOS.SRS27 is the first known DDAG derivative tested positive in mouse asthma model and as such SRS27 could serve as a prototype prophylactic agent.

Agglutinin isolated from Arisema heterophyllum Blume induces apoptosis and autophagy in A549 cells through inhibiting PI3K/Akt pathway and inducing ER stress

Arisaema heterophyllum Blume is one of the three medicinal plants known as traditional Chinese medicine Rhizoma Arisaematis(RA). RA has been popularly used to treat patients with convulsions, inflammation, and cancer for a long time. However, the underlying mechanisms for RA effects are still unclear. The present study was designed to determine the cytotoxicity of agglutinin isolated from Arisema heterophyllum Blume(AHA) and explore the possible mechanisms in human non-small-cell lung cancer A549 cells. AHA with purity up to 95% was isolated and purified from Arisaema heterophyllum Blume using hydrophobic interaction chromatography. AHA dose-dependently inhibited the proliferation of A549 cells and induced G_1 phase cell cycle arrest. AHA induced apoptosis by up-regulating pro-apoptotic Bax, decreasing anti-apoptotic Bcl-2, and activating caspase-9 and caspase-3. In A549 cells treated with AHA, the PI3K/Akt pathway was inhibited. Furthermore, AHA induced increase in the levels of ER stress markers such as phosphorylated eukaryotic initiation factor 2α(p-eIF2α), C/EBP-homologous protein(CHOP), inositol-requiring enzyme 1α(IRE1α), and phosphorylated c-Jun NH_2-terminal kinase(p-JNK). AHA also induced autophagy in A549 cells. Staining of acidic vesicular organelles(AVOs) and increase in the levels of LC3II and ATG7 were observed in AHA-treated cells. These findings suggested that AHA might be one of the active components with anti-cancer effects in Arisaema heterophyllum Blume. In conclusion, cytotoxicity of AHA on cancer cells might be related to its effects on apoptosis and autophagy through inhibition of PI3K/Akt pathway and induction of ER stress.

Twist促进乳腺癌细胞BT-549乳腺细胞小球形成及其迁移

目的探讨Twist基因功能缺失对乳腺肿瘤干细胞样细胞富集及其迁移的影响。方法采用shRNA干扰技术构建Twist基因敲减的BT-549乳腺癌细胞株(BT-549-sh Twist细胞株)和阴性对照细胞株BT-549-sh Vec;采用实时荧光定量PCR和Western blot法验证干扰效率;长程无血清悬浮培养方法富集具有干细胞特性的乳腺癌细胞小球(mammosphere);TranswellTM法检测乳腺癌细胞小球的迁移能力。结果采用shRNA干扰技术成功构建Twist基因敲减的BT-549乳腺癌细胞株BT-549-sh Twist细胞株;BT-549-sh Twist细胞株的mammosphere富集能力和迁移能力减弱。结论 Twist促进BT-549乳腺癌乳腺细胞小球形成及其迁移。