质粒表达的短发夹状RNA特异性抑制鼻咽癌细胞的增殖

目的观察pmU6-sibclD重组体在细胞内表达的bcl-xL短发夹状RNA(short hairpin RNA,shRNA)能否特异地抑制人鼻咽癌CNE-2Z细胞的增殖.方法将自行构建的表达短发夹状RNA的重组质粒转染到人鼻咽癌CNE-2Z细胞株、卵巢癌HO-8910细胞株和正常人类肝脏L-O2细胞株中,流式细胞仪检测转染率,MTT比色法检测细胞的生长抑制率.结果bcl-xLshRNA能特异地抑制CNE-2Z细胞株的生长增殖,而对正常人类肝脏细胞株的生长增殖和HO-8910细胞中的绿色荧光蛋白(green fluorescence protein,GFP)的表达无抑制作用.结论pmU6-sibclD重组体在细胞内表达的短发夹状RNA能特异性抑制鼻咽癌细胞的生长增殖,为质粒介导的RNAi技术运用于肿瘤的基因治疗提供一定的理论依据.     

腺病毒介导的shRNA沉默hTERT基因表达对鼻咽癌细胞增殖和凋亡的影响

目的探讨靶向人端粒酶反转录酶（hTERT)的短发夹RNA（shRNA)对人鼻咽癌细胞株CNE-2 hTERT表达的影响,及其对鼻咽癌细胞增殖和凋亡的效应。方法构建表达绿色荧光蛋白(EGFP)基因和靶向hTERT基因短发夹RNA的重组腺病毒质粒,观察其对鼻咽癌细胞株(CNE-2)的转染效果,RT-PCR检测hTERT mRNA表达水平,Western blot检测hTERT蛋白表达水平,CCK-8法检测细胞增殖活性,流式细胞仪检测细胞凋亡状况。结果Adv-EGFP-shTERT重组腺病毒质粒转染率可达90%以上,成功转染CNE-2细胞24 h后,hTERT mRNA的表达水平显著下降,转染48 h后,hTERT蛋白表达明显下调,细胞增殖活性受到显著抑制,细胞凋亡率可达23.0%。结论腺病毒载体介导靶向hTERT基因的RNA干扰,能显著抑制端粒酶反转录酶表达,进而抑制端粒酶活性,抑制CNE-2细胞增殖并诱导其凋亡,为鼻咽癌的基因治疗研究提供了理论基础。     

脂质体介导bcl-xL反义寡核苷酸对鼻咽癌CNE-2Z细胞株凋亡的影响

背景与目的:实验证明 bcl-xL在鼻咽癌 CNE-2Z细胞中存在高表达 , 它可能在鼻咽癌的发生发展中发挥着重要的作用 . 本研究以脂质体 (lipofectin)为载体 , 将人工合成的 bcl-xL反义寡核苷酸 (antisense oligodeoxynucleotide,ASODN)片段导入 CNE-2Z细胞 , 拟探讨 ASODN对 CNE-2Z细胞的影响 . 方法:以 bcl-xL的编码区为靶点 , 人工合成 20个碱基全硫代修饰的反义寡核苷酸 , 脂质体转染反义寡核苷酸进入 CNE-2Z细胞后 , 用 MTT法检测细胞成活率 ; 用琼脂糖凝胶电泳、荧光染色、流式细胞术等方法检测细胞凋亡 . 结果:MTT结果发现 , ASODN在 Lip介导下即可显著抑制 CNE-2Z细胞株细胞增殖 (P< 0.01), ASODN对细胞增殖的抑制作用随其浓度增加而增强 ; ASODN作用细胞 36 h后 , 经 Hoechst 33258/PI双染在荧光显微镜下可见细胞缩小、染色质固缩、核断裂 ; 流式细胞仪分析发现在 G1峰前出现一个亚二倍体峰即凋亡峰 ; 琼脂糖凝胶电泳分析可见 ASODN/Lip处理组出现明显的 " 梯状 " 外观等凋亡特征性改变 . 结论:ASODN脂质体转染 CNE-2Z细胞后可促进 CNE-2Z的细胞凋亡 ; 在肿瘤研究中 , bcl-xL可作为一个有用的靶基因 , 为开发鼻咽癌基因治疗药物提供实验依据 .     

抗端粒酶核酶质粒的构建筛选及其对CNE-2Z细胞增殖与凋亡的影响

背景与目的:已证实端粒酶(telomerase,TLMA)对肿瘤的进展和肿瘤细胞的无限增殖起着重要的决定作用。核酶是具有特殊核酸内切酶活性的反义RNA,可序列特异性地与靶RNA分子配对并切割靶基因RNA。有报道人低分化鼻咽癌CNE-2Z细胞端粒酶阳性,本实验目的是构建抗端粒酶RNA模板区特异性核酶的真核表达载体并用电穿孔法将其导入人低分化鼻咽癌CNE-2Z细胞,研究该核酶对CNE-2Z细胞增殖、凋亡的影响。方法:设计合成针对端粒酶RNA模板区的锤头状核酶基因teloRZ作为端粒酶抑制剂,构建3种带有绿色荧光蛋白(greenfluorescentprotein,GFP)报道基因和嘌呤霉素(puromycin)抗性基因的teloRZ真核表达质粒pGFPuro-teloRZ2.1、pGFPuro-teloRZ7.1、pGFPuro-teloRZ7.7,这3种质粒的不同点在于teloRZ基因和puromycin抗性基因按3种不同方向设计,然后将上述3种质粒及载体质粒pPAT-GFP电转染CNE-2Z细胞,用荧光显微镜检测GFP表达情况;用流式细胞仪、荧光染色法检测细胞增殖指数及凋亡等指标。结果:CNE-2ZGTR7.1细胞(转染目的基因质粒pGFPuro-teloRZ7.1的CNE-2Z细胞)增殖指数(25.100±0.141)%明显低于CNE-2Z细胞(未转染质粒的细胞)的(53.663±16.981)%、CNE-2ZG细胞(转染空载质粒pPAT-GFP的CNE-2Z细胞)的(61.575±5.166)%、CNE-2ZGTR2.1     

RNA干扰maspin基因对胃癌细胞株MKN-28凋亡的影响

目的:探讨转染maspin特异性短发夹RNA(short hairpin RNA, shRNA)重组质粒对胃癌细胞株MKN-28凋亡的影响.方法:设计并合成针对maspin基因的shRNA,并将其与真核表达载体pGenesil-1.1连接,构建重组质粒pGenesil-maspin.应用RT-PCR和Western 印迹法检测转染重组质粒后MKN-28细胞中maspin、bcl-2和bax mRNA及蛋白的表达变化,应用FCM法检测转染重组质粒对MKN-28细胞的细胞周期和细胞凋亡的影响.结果:成功构建maspin特异性shRNA重组质粒pGenesil-maspin1、pGenesil-maspin2及pGenesil-HK(阴性对照); pGenesil-maspin成功转染后可明显下调胃癌细胞MKN-28中 maspin和bax mRNA及蛋白的表达水平(P<0.01),并上调bcl-2 mRNA和蛋白的表达水平(P<0.01);重组质粒转染后,MKN-28细胞的细胞周期呈现G0/G1期细胞减少(P<0.01),细胞凋亡率下降(P<0.01).结论:外源性maspin shRNA转染MKN-28细胞后能下调maspin的表达,抑制胃癌细胞的凋亡,且使细胞周期分布发生改变;其分子机制可能与上调bcl-2和下调bax的表达有关.     

短发夹状RNA介导的RNAi对白血病细胞株HL-60的抑制作用

目的 为探讨RNA干扰对HL-60细胞的抑制作用,构建survivin的短发夹状RNA真核表达载体并将其导入白血病细胞株HL-60细胞.方法 设计、合成两对针对survivin的短发夹状RNA序列,连接到带有人U6启动子的载体质粒pSINsi-hU6中,将构建重组质粒命名为pSIN/shRNA1和pSIN/shRNA2.pSIN/shRNA1转染HL-60细胞,应用四唑盐(MTT)比色法观察细胞增殖情况;流式细胞仪检测细胞凋亡.结果 酶切分析和测序证实pSIN/shRNA1和pSIN/shRNA2构建成功.MTT测定显示转染重组质粒pSIN/shRNA1进入HL-60细胞48、72、96 h后细胞增殖明显受到抑制,分别与阴性对照组、空白对照组比较,差异有统计学意义(P＜0.01).流式细胞仪分析pSIN/shRNA1细胞凋亡率达(20.21±0.75)%,明显高于阴性对照组的(2.58±0.48)%和空白对照组的(1.26±0.30)%(P＜0.05).结论 构建survivin基因RNAi真核表达载体成功;pSIN/shRNA1序列可特异性地抑制HL-60细胞的增殖并诱导其凋亡.     

食管小细胞癌与小细胞肺癌凋亡生物学特性的研究

[目的]探讨原发性食管小细胞癌(primary esophageal small cell carcinoma,PESC)和小细胞肺癌(small cell lung carcinoma,SCLC)凋亡生物学特性。[方法]采用免疫组织化学SP法检测survivin,caspase-3,bcl-2,mtp53在PESC和SCLC中的表达。[结果]PESC和SCLC中survivin,caspase-3,bcl-2,mtp534种蛋白的阳性分布无统计学差异(P>0.05)。在PESC和SCLC survivin阴性组中,caspase-3阳性表达率分别为72.41%和62.07%,均明显高于survivin阳性组(30.00%和25.00%,P<0.05)。在这两种小细胞癌中,survivin与caspase-3表达呈负相关;bcl-2与mtp53的表达呈正相关;bcl-2与caspase-3或survivin之间无相关性。[结论]食管小细胞癌和小细胞肺癌的抗凋亡通路存在诸多相同之处,survivin,bcl-2和mtp53均参与了两种小细胞癌的发生发展。     

survivin shRNA重组腺病毒的构建及其对人肺癌细胞A549的作用

 目的 构建携带人生存素survivin短发夹RNA（short hairpin RNA,shRNA）表达载体的重组腺病毒,以此介导小干扰RNA（small interfering RNA,siRNA）药物对人A549细胞肺癌的治疗,为下一步动物实验研究提供基础。 方法 将前期实验中构建并筛选的重组质粒pShutte-survivin与携带LacZ标签的腺病毒骨架质粒共转染HEK-293 T细胞,经同源重组产生重组腺病毒Ad-survivin;经PCR鉴定并测定病毒滴度;β-gal染色检测病毒对人肺癌细胞A549的感染效率;MTT实验和流式细胞术检测其对A549细胞的作用;半定量RT-PCR检测RNAi效果;Hoechst染色观察凋亡情况。 结果 PCR证实重组腺病毒Ad-survivin构建成功;β-gal染色表明感染效率明显;A549细胞增殖受到抑制并阻滞于G₂/M期;survivin mRNA的表达受到抑制;荧光染色发现有凋亡细胞。 结论 成功构建人survivin基因shRNA 表达载体的重组腺病毒,下调survivin表达后能诱导A549 细胞凋亡,为研究肺癌RNAi 途径的基因治疗奠定基础。     

存活蛋白在子宫内膜癌中的表达及其在细胞凋亡中的作用

目的:探讨子宫内膜癌中存活蛋白(survivin)的表达及其对细胞凋亡的作用.方法:免疫组织化学法检测survivin在子宫内膜癌组织中的表达,并且应用RNA干扰技术沉默survivin基因,RT-PCR和Western印迹法检测RNA干扰效果,FCM法检测RNA干扰前后细胞凋亡的变化,Western印迹法检测凋亡相关蛋白caspase-3、caspase-8和bcl-2的表达变化.结果:子宫内膜癌组织中survivin蛋白的阳性率显著高于不典型增生和正常内膜组织(P<0.05和P<0.01).RNA干扰有效抑制了survivin mRNA和蛋白的表达(均为P<0.01),并且诱导了细胞凋亡,2个干扰组的细胞凋亡率均显著高于对照组(P<0.01).RNA干扰亦上调了活性caspase-3、caspase-8的表达.结论:survivin基因的异常表达与子宫内膜癌的发生密切相关,抑制其表达可以诱导子宫内膜癌细胞发生凋亡.     

化疗药物对淋巴瘤survivin mRNA表达的影响

目的 探讨抗肿瘤药物环磷酰胺(CTX)、甲氨蝶呤(MTX)、氟尿嘧啶(5-Fu)的作用及耐药机制.方法 将化疗药物作用于HL-60、Raji和Jurkat细胞株,RT-PCR检测抗凋亡基因survivin、bcl-2和凋亡基因caspase-3 mRNA水平的变化,对结果进行半定量分析.用MTT法检测转染survivin反义mRNA的Jurkat细胞对抗肿瘤药物的敏感性.结果 HL-60、Raji和Jurkat细胞高表达survivin和bcl-2 mRNA,survivin和bcl-2 mRNA表达随着化疗药物作用时间延长和剂量升高逐渐减弱;但Raji细胞经低剂量MTX作用24 h survivin mRNA表达升高,HL-60细胞经CTX作用24 h bcl-2 mRNA表达升高;不表达caspase-3的Raji和Jurkat细胞,经CTX作用24 h表达caspase-3 mRNA.转染survivin反义mRNA后Jurkat细胞对抗肿瘤药物的敏感性增加,细胞生长抑制率明显大于未转染组.结论 survivin和bcl-2 mRNA表达降低和caspase-3表达升高与CTX、MTX、5-Fu抗肿瘤作用有关,抑制survivin表达可以增加化疗药物的敏感性.     

Apoptosis induced by low-dose paclitaxel is associated with p53 upregulation in nasopharyngeal carcinoma cells.

Paclitaxel exerts its cytotoxic effect by kinetic suppression of microtubules that block cells in the G2/M phase of the cell cycle and trigger apoptosis. To investigate apoptosis induced by paclitaxel in nasopharyngeal carcinoma (NPC), and its possible molecular mechanism of action, the human NPC cell lines HNE-1 (bearing wild-type p53) and CNE-2 (bearing mutant p53) were treated with different concentrations of paclitaxel. Apoptosis was determined by staining with propidium iodide and also by DNA fragmentation. Protein expression levels of p53, bcl-2 and bcl-xl were examined by Western blotting. Activation of caspase-3 and cleavage of poly(ADP-ribose) polymerase (PARP) were also studied in paclitaxel-induced apoptosis. We showed that paclitaxel inhibited growth and induced apoptosis in both cell lines but that the p53 mutant line (CNE-2) was less sensitive to treatment with low-dose paclitaxel. Caspase-3 activity and cleavage of death substrate PARP were significantly increased in a dose-dependent manner, both in parallel with the induction of apoptosis and growth inhibition of NPC cells. We observed a striking increase of p53 protein levels in NPC cells exposed to 1 and 10 nM paclitaxel but a marked inhibition at 100 nM paclitaxel treatment. An inhibitor of caspase, zVAD.fmk, blocked the apoptotic morphologic changes and DNA fragmentation but did not change the rate of cell death or the protein levels of p53, bcl-2 and bcl-xl. In summary, low-dose paclitaxel inhibited cell growth in NPC cells and induced apoptosis possibly by upregulation of p53. In contrast, cell growth and apoptosis induced by a high dose of the drug occurred in a p53-independent manner, which may directly initiate downstream events of apoptosis.     

Neoplastic cell apoptosis in nude mice transplants with nasopharyngeal carcinoma cell lines

We know that tumor growth speed is criticallyinfluenced by the ratio of neoplastic cell proliferation andcell death, and there are two patterns of cell death, namely,necrosis and apoptosis. What is the proportion of necrosisand apoptosis seen in nude mice transplants ofnasopharyngeal carcinoma (NPC) cell lines, CNE-1 andCNE-2? Does the apoptosis play an important role inneoplastic cell death? If so, what is the pathway ofapoptosis developed in those transplants?MATERIALS AND METHODS…     

Caspase-3在X线诱导的鼻咽癌细胞凋亡中的调控作用

目的探讨X线诱导后鼻咽癌CNE-2细胞凋亡存在形式以及Caspase-3酶活性、mRNA、蛋白的表达及相互之间的关系,拟阐明Caspase-3在X线诱导的鼻咽癌细胞凋亡中的调控及意义。方法用不同剂量X线照射鼻咽癌CNE-2细胞,于不同时间检测细胞形态学及早期细胞凋亡率变化,分别用比色法、Western blot 、RT-PCR检测Caspase-3酶活性、蛋白含量、mRNA,同时设立酶活性抑制剂AC-DEVD-CHO对照组,观察Caspase-3酶活性被阻抑后细胞凋亡及Caspase-3表达的变化。结果（1）X线照射后鼻咽癌CNE-2细胞呈典型的凋亡特征,且早期凋亡率与射线剂量、诱导时间成正比;（2） CNE-2凋亡细胞中Caspase-3酶活性明显增高,用AC-DEVD-CHO抑制Caspase-3活性后细胞的凋亡率减少,且凋亡形态学特征不明显。（3）凋亡细胞中Caspase-3 mRNA表达量未见明显升高,而蛋白在凋亡形成后则完全裂解为17kD的活性Caspase-3,在正常细胞为32kD的pro-Caspase-3。结论X线诱导后CNE-2细胞呈典型的凋亡改变。凋亡细胞中有明显的Caspase-3激活,其Caspase-3的活性增高并非源于其转录的提高,而可能是翻译后酶前体的活化。抑制鼻咽癌Caspase-3酶活性,凋亡的发生可被抑制或是延迟。     

Effects of RNA interference targeting four different genes on the growth and proliferation of nasopharyngeal carcinoma CNE-2Z cells

To explore the effects of RNA interference targeting four different genes (VEGF, C-myc, Survivin, hTERT) on the growth and proliferation of nasopharyngeal carcinoma (NPC) CNE-2Z cells. Fluorescein-labeled short-hairpin (sh)RNA plasmids together and separately targeting VEGF, C-myc, Survivin and hTERT were built and respectively called plasmid-shVEGF-shC-myc-shSurvivin-shhTERT, plasmid-shVEGF, plasmid-shC-myc, plasmid-shSurvivin, plasmid-shhTERT. These plasmids were respectively transfected into human NPC CNE-2Z cells and xenograft tumors in nude mice. The expression of plasmids in NPC CNE-2Z cells and xenograft tumors was observed. Cell proliferation was detected with MTT assay. The mRNA and protein expression were determined by real-time PCR and western blot, respectively. The effects of plasmids on the biological behavior of CNE-2Z cells were observed with transwell invision chamber models. Apoptosis was determined with flow cytometer. The inhibitory effect of plasmids on xenograft tumors was observed in nude mice. The plasmid containing four different shRNAs could significantly inhibit CNE-2Z cell proliferation and decrease invasion ability in vitro compared with plasmids with each single shRNA (P<0.05). The plasmid containing four different shRNAs could simultaneously downregulate VEGF, C-myc, surviving, hTERT mRNA and protein expression in the CNE-2Z cells. The multiple gene shRNA could more significantly induce cell apoptosis than each single shRNA, respectively (P<0.05). The combinative silencing of these four genes had a better inhibitory effect on xenograft tumors than the silencing of each single shRNA (P<0.05). RNA interference targeting multiple genes can effectively inhibit NPC proliferation and induce apoptosis, which provides an experiment basis for NPC gene therapy.     

土贝母苷甲诱导人鼻咽癌细胞CNE-2Z凋亡

背景和目的：土贝母[Bolbostemma paniculatum(Maxim．)Franquet]是一种传统中药,我们以前的研究结果已证实从中药土贝母块茎中分离得到的土贝母苷甲(下称苷甲)有强抗肿瘤效果。本研究旨在探讨苷甲对人鼻咽癌细胞株CNE-2Z细胞凋亡的影响。方法：MTT法检测苷甲对肿瘤细胞生长的抑制作用,流式细胞仪分析细胞周期,荧光显微镜和电子显微镜观察细胞形态,琼脂糖凝胶电泳检测DNA电泳图谱的变化,蛋白免疫印迹法检测凋亡相关基因bcl-2和bax表达的变化。结果：苷甲抑制CNE-2Z细胞的生长,其24、48、72h的IC50分别为32．5、20．7、16.7μmol／L。苷甲诱导CNE-2Z细胞发生程序性死亡：流式细胞分析发现Sub—G1峰,50μmol／L苷甲作用CNE-2Z细胞12h,凋亡指数为72．8％;CNE-2Z细胞经苷甲作用(10μmol／L,24、48、72h;30、40、50、60μmol／L,12h)后,其DNA电泳图中出现典型的梯形条带。苷甲诱导bcl-2表达下调且磷酸化,并伴有bax高表达。结论：苷甲诱导CNE-2Z细胞发生形态学和生化学上典型的程序性死亡,其诱导的CNE-2Z细胞凋亡与bcl-2失活和bax激活有关。     

姜黄素诱导低分化鼻咽癌细胞株CNE-2Z的凋亡

背景与目的:鼻咽癌(nasopharyngealcarcinoma,NPC)是我国南方地区的高发肿瘤,发病早期的治疗主要是以放疗为主,而对晚期NPC患者则有必要进行适当的化疗。一些药物可通过诱导肿瘤细胞凋亡来达到治疗肿瘤的目的。本研究拟探讨姜黄素对人鼻咽癌细胞株CNE-2Z体外增殖抑制作用及凋亡的影响。方法:不同浓度姜黄素处理CNE-2Z细胞,用噻唑蓝(MTT)法测定增殖抑制率和IC50;用流式细胞术、Hoechest33258/碘化丙啶(PI)双染、琼脂糖电泳法观察细胞凋亡。结果:姜黄素能抑制CNE-2Z细胞的生长,其效果与姜黄素的浓度和作用时间有关,作用24h、48h、72h的IC50值为(24.05±0.47)、(19.20±0.17)、(7.35±0.50)μmol/L;5、10、20μmol/L姜黄素处理细胞24h后,流式细胞术观察到细胞凋亡率分别为(4.9±3.2)%、(10.7±2.7)%和(14.7±0.5)%;10、20μmol/L姜黄素处理细胞24h后,荧光染色可见细胞缩小,染色质固缩,核染色体碎裂等凋亡形态学改变,琼脂糖凝胶电泳可见DNA梯形条带。结论:姜黄素可诱导CNE-2Z细胞凋亡,姜黄素对CNE-2Z细胞具有增殖抑制作用。     

RADIATION-INDUCED APOPTOSIS OF TWO NASOPHARANGEALCARCINOMA CELL LINES

Apoptosisnowhasbecomeahotspotofcancerresearchbecauseitisregardedthatapoptosishasrelationshipwithcarcinogenesis,development,treatmentandprognosis.[1-3]Manyfactorscaninduceapoptosis,includingradiation;simultaneouslymanygenescanregulatethedevelopmentofa...     

The effects of combining ionizing radiation and adenoviral p53 therapy in nasopharyngeal carcinoma

PURPOSE: Nasopharyngeal carcinoma (NPC) is a malignant disease of the head/neck region, with a 5-year survival level of approximately 65%. To explore gene therapy as a novel approach which might improve outcome, we have shown previously that introduction of human recombinant wild-type p53 mediated by the adenoviral vector (Ad5CMV-p53) was cytotoxic in two human nasopharyngeal carcinoma (NPC) cell lines (CNE-1 and CNE-2Z). The current work was designed to determine whether this strategy, combined with ionizing radiation (XRT), was more effective than either treatment alone. METHODS AND MATERIALS: CNE-1, CNE-2Z, and a normal human nasopharyngeal fibroblast strain, KS1, were infected with 2- and 6-plaque-forming units (pfu)/cell of Ad5CMV-p53, respectively. These doses were isoeffective for beta-galactosidase activity in the CNE-1 and CNE-2Z cells. XRT was administered 24 h post-infection, and Western blot analyses were conducted for p53, p21WAF1/CIP1, bax, and bcl-2 2 days after XRT. Cell survival was assessed using a clonogenic assay. Presence of DNA ladders reflecting apoptosis was detected using DNA agarose gel electrophoresis, and cell cycle was analyzed using flow cytometry. RESULTS: The combination of Ad5CMV-p53 plus XRT (2, 4, and 6 Gy) resulted in an approximately 1-log greater level of cytotoxicity compared to that observed with XRT alone for both NPC cell lines. The two modalities appear to be interacting in a synergistic manner in cancer cells, but not in KS1 fibroblasts. XRT alone stimulated minimal p53 expression in control cells; Ad5CMV-p53 alone induced significant recombinant p53 expression, which was not further enhanced by the addition of XRT. Similar observations were made for p21WAF1/CIP1 expression. No changes were observed for bax or bcl-2 expression with any of these treatments. Apoptosis was induced following 4 Gy of XRT alone, but was observed after only 2 Gy when combined with Ad5CMV-p53. Cell cycle analysis indicated that Ad5CMV-p53 infection did not perturb the cell cycle beyond that observed with XRT alone. CONCLUSION: p53 gene therapy and XRT appears to interact in a synergistic manner; underscoring the significant potential of this novel strategy in the treatment of NPC.     

整合素αⅤ对鼻咽癌CNE-2Z细胞放疗敏感性的影响

目的:探讨粘附分子整合素αV通过细胞间相互作用,是否对鼻咽癌CNE-2Z细胞的放疗敏感性产生影响,进而初步探讨其可能机制。方法:采用liquid overlay技术进行CNE-2Z细胞三维立体(多细胞球)培养;血球计数器计数法比较在阻断整合素αV作用前后CNE-2Z细胞的放射敏感性;AnnexinV/PI双标流式细胞术检测细胞凋亡。结果:(1)成功建立CNE-2Z多细胞球培养模型;(2)CNE-2Z多细胞球在接受X射线照射后,并在一定的照射剂量下,其表达的整合素αV量,随着照射剂量的增加而增加;(3)阻断整合素αV作用后CNE-2Z多细胞球放疗敏感性增强、细胞凋亡率上调。结论:以多细胞球培养模型模拟体内实体瘤情况,证实粘附分子整合素αV的表达情况可以影响鼻咽癌CNE-2Z细胞的放疗敏感性,抑制细胞凋亡是其可能的作用机制。