顺铂诱导宫颈癌Hela细胞凋亡及其作用机制的研究

目的:研究顺铂在体外诱导宫颈癌Hela细胞凋亡及其作用机制。方法:采用MTT法测定顺铂对Hela细胞增殖的影响;流式细胞仪和Hochest33258检测药物作用前后的细胞凋亡情况;RT-PCR检测HPVE6的mRNA水平表达;WesternBlot测定HPVE6、p53、p21、Bax、Bcl-2蛋白水平的表达。结果:顺铂抑制Hela细胞生长呈时效和量效关系;经10μg/ml顺铂分别在12、24、36、48小时作用Hela细胞,亚G1峰与对照组有显著性差异;RT-PCR提示顺铂作用Hela细胞后HPVE6的mRNA水平表达逐渐降低;WesternBlot提示顺铂作用Hela细胞后HPVE6的蛋白水平表达逐渐降低,p53、p21和Bax蛋白水平表达逐步升高,Bcl-2的表达无变化。结论:顺铂通过抑制HPVE6的表达,恢复p53的功能,引起细胞凋亡,起到杀伤肿瘤的作用。     

HPV18E6基因沉默对宫颈癌Hela细胞生长和凋亡的影响

目的：观察RNA干扰法沉默HPV18E6基因表达对宫颈癌Hela细胞牛长和凋亡的影响，探索宫颈癌基因治疗的新途径。方法：针对HPV18E6 mRNA序列合成一对60bp的编码siRNA的DNA模板和一对60bp的非特异性对照DNA模板，构建pSUPER—siRNA和pSUPER—com重组质粒，瞬时转染Hela细胞；采用RT—PCR法检测质粒转染后细胞HPV18E6基因表达的变化，用蛋白免疫印迹法检测转染后Hela细胞p53、p21、Bcl-2和Bax蛋白表达变化，以细胞计数法检测细胞生长情况，Hoechest／PI双荧光活细胞染色法检测细胞凋亡。结果：pSUPER—siRNA质粒转染能有效降低HPV18E6在mRNA水平的表达，转染后48小时，抑制效率达70％以上；转染后细胞053、p21和Bax蛋白表达显著增加，Bcl-2蛋白表达减少。RNA干扰法沉默HPV18E6基因表达后，Hela细胞增殖受到明显抑制，细胞凋亡率明显增加。结论：pSUPER—siRNA质粒转染可有效抑制HPV18E6在人宫颈癌Hela细胞中的表达，抑制Hela细胞生长并促进其凋亡。以HPV18E6为靶点的RNA干扰技术可望成为宫颈癌基因治疗的新途径。     

Leptomycin B enhances CDDP-sensitivity via nuclear accumulation of p53 protein in HPV-positive cells

Cervical cancer, which commonly contains a wild-type p53 gene, is highly correlated with human papilloma virus (HPV) infection. Because the oncoprotein E6, derived from HPV, inhibits the function of p53 protein, the inhibition of apoptosis via the p53 pathway by HPV may be related to cisplatin (CDDP)-sensitivity in cervical cancer. We conducted the present study to determine whether and how HPV is related to CDDP-sensitivity in HPV-positive cervical cancer cells. We used cervical carcinoma cell lines HeLa with integrated HPV 18 and SiHa with integrated HPV 16. An HPV-negative cell line, Yumoto, with wild-type p53 gene was used as a control. Leptomycin B (LMB) enhanced sensitivity to CDDP and CDDP-induced apoptosis in HeLa and SiHa cells, but not in Yumoto cells. After exposure to LMB or CDDP alone, we observed weak p53 staining in HeLa, SiHa and Yumoto cells. Nuclear p53 staining was significantly increased by combined treatment with CDDP and LMB in HeLa and SiHa cells, but not in Yumoto cells. The expression of p53 and Bax protein increased with exposure to CDDP and was enhanced by LMB in HeLa and SiHa cells. The present study demonstrated that LMB enhanced CDDP-sensitivity via nuclear accumulation of p53 protein in HPV-positive cells.     

滋肾固髓汤通过调控p38MAPK/p53信号通路诱导结直肠癌HCT-116细胞凋亡

目的:探讨滋肾固髓汤对结直肠癌HCT-116细胞凋亡的影响及其分子机制。方法:制备滋肾固髓汤含药血清,首先采用不同体积分数滋肾固髓汤含药血清处理HCT-116细胞,噻唑蓝(MTT)检测细胞增殖活性;再将HCT-116细胞分为空白组、滋肾固髓汤低、中、高剂量组、SB203580(p38MAPK抑制剂)组和高剂量滋肾固髓汤+SB203580组,分别加入相应药物进行干预后,Hoechst 33258染色观察细胞凋亡的形态学变化;Annexin V-FITC流式细胞术检测细胞的凋亡水平;Western blot检测细胞中p38MAPK、磷酸化(p)-p38MAPK(Thr180/Tyr182)、鼠双微染色体2(MDM2)、p53、Cleaved caspase-3、Bax和Bcl-2等蛋白表达水平。结果:滋肾固髓汤可抑制HCT-116细胞增殖活性,并呈时间和浓度依赖性。不同浓度滋肾固髓汤处理可诱导HCT-116细胞呈现核聚集、皱缩或碎裂等凋亡形态变化,促进细胞凋亡,上调p-p38MAPK、p53、Bax和Cleaved caspase-3等蛋白表达水平,下调MDM2和Bcl-2蛋白表达水平。S...     

绿原酸对人胶质瘤细胞U251的抗肿瘤活性及其促凋亡机制

 目的 研究绿原酸对人胶质瘤细胞U251细胞株增殖、凋亡的作用及其机制。方法 培养人胶质瘤U251细胞，不同浓度绿原酸处理细胞48 h后，CCK-8法检测细胞生长抑制率，观察细胞形态学变化；Annexin V-FITC/PI染色法检测细胞凋亡，RT-PCR及Western blot检测p53、Livin、Bcl-2、Bax mRNA和蛋白的表达，Western blot检测Caspase-3蛋白的表达。结果 不同浓度绿原酸干预U251细胞48 h后显著抑制细胞的增殖活性，促进细胞凋亡，并且能够上调p53和Bax基因，下调Livin、Bcl-2 mRNA和蛋白的表达，促进Caspase-3蛋白的表达。结论 绿原酸可能是通过上调p53和Bax的表达，下调Livin和Bcl-2的表达，激活Caspase-3蛋白，最终诱导U251细胞凋亡。     

贝母素乙通过调控PI3K/Akt信号通路诱导乳腺癌MCF-7细胞凋亡

目的：探究贝母素乙（Peiminine）对乳腺癌细胞MCF-7细胞凋亡的影响及其可能作用机制。方法：采用不同浓度贝母素乙或联合PI3K抑制剂LY294002干预MCF-7细胞,MTT法检测细胞增殖能力;Hoechst33258染色和Annexin V-FITC/PI流式细胞术检测细胞凋亡情况;JC-1染色法检测细胞线粒体膜电位变化;Western blotting检测细胞中PI3K(p110α)、Akt、p-Akt(ser473)、Bad、Bax、Bcl-2、cleaved-Caspase-3以及线粒体和胞浆中细胞色素C(Cyt C)等蛋白表达水平。结果：贝母素乙可呈时间-浓度依赖性抑制MCF-7细胞增殖,诱导细胞出现凋亡形态改变,促进细胞凋亡,并降低线粒体膜电位,上调细胞中Bad、Bax、cleaved-Caspase-3及胞浆中Cyt C蛋白表达水平,下调PI3K(p110α)、p-Akt、Bcl-2和线粒体中Cyt C蛋白表达水平,而Akt蛋白表达水平无显著变化。然而,联合LY294002干预可增强贝母素乙对MCF-7细胞凋亡的促进作用。结论：贝母素乙可诱导乳腺癌MCF-7细胞凋...     

靶向HPV18E6基因siRNA对HeLa细胞p21、VEGF、Bax 和Bcl-2基因的影响

 目的 探讨针对人乳头瘤病毒18型E6基因的特异性小干扰RNA（siRNA）对宫颈癌HeLa细胞p21、VEGF、Bax和Bcl-2基因的影响。 方法 采用脂质体法将特异性siRNA瞬时转染HeLa细胞,半定量RT-PCR检测siRNA转染后HeLa细胞中p21、血管内皮生长因子（VEGF）、Bax和Bcl-2 mRNA的变化,免疫组化检测HeLa细胞中p21和VEGF蛋白的变化。 结果 RT PCR检测结果显示转染后24、48、 72h p21和Bax mRNA的表达与转染前比较均有升高。转染后24、48、72h VEGF和Bcl-2 mRNA的表达与转染前比较均有降低。免疫组化检测结果显示转染后48、72h p21蛋白的表达与转染前比较均有升高。转染后48、72h VEGF蛋白的表达与转染前比较均有降低。 结论 靶向HPV18 E6基因的siRNA可有效干扰宫颈癌HeLa细胞中p21、VEGF、 Bax和Bcl-2基因的表达,从而抑制细胞增殖。     

TRICHOSTATIN A INHIBITS PROLIFERATION, INDUCES APOPTOSIS AND CELL CYCLE ARREST IN HELA CELLS

Objective： The histone deacetylase inhibitors （HDACIS） have been shown to inhibit cancer cell proliferation, stimulate apoptosis, an induce cell cycle arrest. Our purpose was to investigate the antiproliferative effects of a HDACI, trichostatin A （TSA）, against human cervical cancer cells （HeLa）. Methods： HeLa cells were treated in vitro with various concentrations of TSA. The inhibitory effect of TSA on the growth of HeLa cells was measured by MTT assay. To detect the characteristic of apoptosis chromatin condensation, HeLa cells were stained with Hoechst 33258 in the presence of TSA. Induction of cell cycle arrest was studied by flow cytometry. Changes in gene expression of p53, p21wafl and p27Kipl were studied by semiquantitative RT-PCR. Results： TSA inhibited cell growth in a time- and dose-dependent manner. Hoechst 33258 staining assay showed that TSA induced apoptosis. Cell cycle analysis indicated that treatment with TSA decreased the proportion of cells in S phase and increased the proportion of cells in G0/G1 and/or G2/M phases of the cell cycle. This was concomitant with overexpression of genes related to malignant phenotype, including an increase in p53, p21wall and p27Kipl. Conclusion： These results suggest that TSA is effective in inhibiting growth of HeLa cells in vitro. The findings raise the possibility that TSA may prove particularly effective in treatment of cervical cancers.     

塞来昔布对宫颈癌细胞的化疗增敏作用

目的探讨特异性环氧化酶-2（COX-2）抑制剂塞来昔布对顺铂诱导宫颈癌Hela细胞增殖与凋亡的作用及机制。方法采用四甲基偶氮唑蓝比色法（MTT）,测定塞来昔布对顺铂诱导Hela细胞增殖活性的作用;应用流式细胞仪检测细胞凋亡率;Western blot检测Hela细胞中Bcl-2、Bax蛋白的表达情况。结果 5、10μmol/L的塞来昔布分别与顺铂联合应用,可增强顺铂对Hela细胞增殖抑制作用。塞来昔布（5μmol/L）能促进顺铂诱导Hela细胞的凋亡。塞来昔布作用于Hela细胞后,Bcl-2蛋白表达水平下调、Bax蛋白表达水平上调呈浓度依赖关系。结论塞来昔布能促进顺铂对Hela细胞增殖抑制和诱导凋亡作用,起化疗增敏作用,可能与其下调Bcl-2蛋白表达水平、上调Bax蛋白表达水平有关。     

雷帕霉素诱导人肝癌细胞BEL-7402凋亡中Bcl-2作用研究

目的探讨雷帕霉素(rapamycin,RAPA)体外对肝癌BEL-7402细胞生长抑制及诱导细胞凋亡中的作用及Bcl-2变化在凋亡机制中的意义。方法以5、10、20、30、40和50nmol/L不同浓度的RAPA作用于体外培养的BEL-7402细胞,MTT法检测细胞生长抑制率,应用流式细胞仪检测细胞凋亡,Hoechst33258荧光染色法观察细胞凋亡时的形态学变化,Westernblot观察Bcl-2、Bcl-xl和bax等凋亡相关表达变化。结果RAPA可显著抑制BEL-7402细胞的生长,诱导细胞发生凋亡,并呈现出明显的量-效与时-效关系。RAPA作用肝癌细胞BEL-740248h后,在Hoechst33258荧光染色图片上可见核浓缩及核碎裂等典型的细胞凋亡特征,凋亡过程中伴有抗凋亡蛋白Bcl-2、Bcl-xl表达的降低和促凋亡蛋白bax上调。结论RAPA可能通过诱导抗凋亡蛋白Bcl-2、Bcl-xl表达的降低和促凋亡蛋白bax表达上调而诱导凋亡发生,抑制BEL-7402细胞的生长。     

Ⅰ型磷酸酶抑制亚基-1对人宫颈癌HeLa细胞凋亡的影响

背景与目的:Ⅰ型磷酸酶抑制亚基-1(inhibitor-1 of protein phosphatase Ⅰ,PPI1)依赖于35位苏氨酸的磷酸化而发挥抑制作用.本研究目的在于观察PPI1野生型和持续活化型突变体的表达对宫颈癌细胞株的凋亡及凋亡刺激敏感性的影响,并初步探讨其可能的作用机制.方法:通过Lipofectamine介导.用PPI1野生型和持续活化型突变体表达质粒分别转染HeLa细胞,以未转染的及转染空载体的HeLa细胞为对照组,用RT-PCR和Western blot鉴定目的蛋白的表达:通过克隆形成实验观察PPI1对细胞克隆形成能力的影响,用Hoechst33258荧光染色、亚二倍体分析法分析PPI1对HeLa细胞凋亡的影响,用流式细胞术分析转染PPI1后的HeLa细胞对肿瘤坏死因子(tumor-necrosis factor,TNF)凋亡刺激的敏感性,用Western blot分析PPI1对凋亡相关蛋白表达及MAPK信号转导通路的影响.结果:PPI1野生型和持续活化型突变体在HeLa细胞中能够有效表达.荧光染色和亚二倍体分析均表明PPI1持续活化型突变体的表达使细胞凋亡增多,并能明显抑制HeLa细胞的克隆形成能力.Western blot分析表明,PPI1持续活化型突变体可使促凋亡分子P53、P27、BAK表达上调,而抗凋亡分子Bcl-2和Bcl-xL的表达下调.流式细胞术分析表明PPIl持续活化型突变体表达的HeLa细胞在TNF-α刺激后细胞凋亡率为19.06%,而对照组为2.67%和1.89%.Western blot分析表明,TNF刺激后,在JNK信号转导通路中,该组细胞JNK的磷酸化程度比对照组明显增强,而且持续的时间也较长;对于p38信号转导通路,则在TNF刺激30 min后,p38出现磷酸化,而其他组均无.结论:PPI1持续活化型突变体的表达可诱导宫颈癌细胞株的凋亡,并能明显增强HeLa细胞对TNF凋亡刺激的敏感性,其中涉及到JNK、p38信号转导通路的活化增强.     

姜黄素对子宫颈癌HeLa细胞增殖抑制作用及其机制的研究

目的:探讨姜黄素(Curcum in)对体外培养人子宫颈癌HeLa细胞抗癌作用及分子机制。方法:MTT法检测细胞增殖,流式细胞仪检测凋亡和细胞周期,PI/Hoechst33258荧光双染法检测细胞凋亡,W estern b lot法检测细胞凋亡相关蛋白Bc l-2和Bax蛋白的表达。结果:姜黄素对HeLa细胞生长有抑制作用,并呈剂量依赖性;流式细胞仪分析证实姜黄素能使HeLa细胞阻滞在S期,并出现亚二倍体凋亡峰;荧光双染法可见凋亡细胞;W estern b lot结果显示Bax蛋白表达均上调,而Bc l-2的表达无明显影响。结论:姜黄素对人子宫颈癌HeLa细胞的增殖具有显著的抑制作用并可诱导细胞凋亡;Bax蛋白的表达上调可能参与了诱导细胞凋亡。     

文殊兰叶氯仿提取物诱导NCI-H460细胞凋亡的研究

目的研究文殊兰叶氯仿提取物（CE）对非小细胞肺癌NCI-H460细胞增殖和凋亡的影响。方法通过MTT法检测CE对NCI-H460细胞的生长抑制作用;采用Hoechst 33258荧光染色法检测CE作用后凋亡细胞形态的变化;通过免疫细胞化学检测细胞凋亡相关蛋白Bcl-2和Bax的表达;采用流式细胞术（FCM）检测CE作用后对细胞周期的影响。结果CE抑制NCI-H460细胞增殖,其24、48、72 h的IC50分别为：（36.22 ±3.04）、（41.21±2.50）、（62.55±3.47） mg/L;荧光染色显示,经CE作用后的细胞出现细胞核裂解,染色质浓缩,产生凋亡小体;免疫细胞化学法显示CE能增强促进凋亡蛋白Bax和降低抑制凋亡蛋白Bcl-2的表达;FCM检测表明CE作用后的细胞被阻滞在G1/S期。结论CE在体外能有效地抑制NCI-H460细胞生长,其机制可能与改变细胞周期并诱导细胞凋亡有关。     

Ad-ING4对人前列腺癌细胞PC-3体内外抑癌效应的研究

背景与目的：腺病毒作为载体已被广泛用于肿瘤的基因治疗。ING4是生长抑制因子家族中的一个成员,是一种潜在的抑癌基因。本研究旨在探讨腺病毒介导的人ING4基因（Ad-ING4）对人前列腺癌细胞PC-3的体内外抑癌效应及其分子机制。方法：将扩增的Ad-ING4重组腺病毒感染PC-3细胞,用RT-PCR法检测ING4在PC-3细胞中的转录;MTT法检测ING4基因对PC-3细胞增殖的影响：流式细胞术和Hoechst33258染色法检测细胞凋亡的变化;半定量RT-PCR法检测ING4基因的表达对PC．3细胞中的bcl-2、bax、p53和caspase-3凋亡相关基因表达的影响。用Ad-ING4重组腺病毒在裸鼠PC-3移植瘤的瘤体内注射治疗,观察肿瘤生长变化,15d后处死裸鼠,摘除瘤体,称瘤重;用免疫组化法检测瘤组织中Bcl-2、Bax、Caspase-3和CD34蛋白的表达。结果：腺病毒介导的人ING4基因在PC-3细胞中成功转录,明显抑制PC-3细胞增殖,上调p53、bax、caspase．3基因表达和下调bcI-2基因表达,并诱导细胞凋亡。Ad-ING4重组腺病毒能显著抑制裸鼠PC-3移植瘤的生长,瘤重的抑制率达37％,与空病毒载体Ad-GFP组和细胞对照PBS组比较差异有统计学意义（P〈0．05）;免疫组化结果显示Ad-ING4重组腺病毒能明显上调Bax和Caspase-3蛋白的表达水平,下调Bcl-2和CD34蛋白的表达水平。结论：腺病毒介导的ING4基因在体内外均可明显抑制人前列腺癌细胞PC-3的生长,诱导其凋亡,其机制可能是上调P53、Bax、Caspase-3蛋白和下调Bcl-2蛋白表达水平。     

Both HPV and carcinogen contribute to the development of resistance to apoptosis during oral carcinogenesis

Oral carcinomas frequently contain human papilloma virus (HPV)-16/18. As p53 is degraded through interaction with HPV-16/18 products (E6/E7), p53 dysfunction may contribute to oral carcinogenesis. Furthermore, epidemiological studies suggest that smoking history may be critical for oral carcinogenesis. To delineate the involvement of HPV-16 infection and carcinogen in oral carcinogenesis, Park et al have established a multistep oral carcinogenesis model. Overexpression of p53 altered the expression of Fas antigen (Fas-R), Bax and Bcl-2; however, it remains unclear how the loss of p53 modifies the expression of these molecules. Using the multistep oral carcinogenesis model, we analyzed how the loss of p53 and carcinogen modified the expression of these molecules and their role in the development of resistance to apoptosis of oral carcinomas. The HOK-16B cell line was immortalized by HPV-16 transfection of normal human oral keratinocytes (NHOK). HOK-16B-BaP and HOK-16B-BaP-T1 were established from HOK-16B following short-term and long-term stimulation with the chemical carcinogen, benzo(a)pyrene, respectively. The malignant phenotype develops in sequence from HOK-16B, HOK-16B-BaP and HOK-16B-BaP-T1. The expression of apoptosis-related molecules was examined by Western blot analysis or by flow cytometry. Fas-mediated cytotoxicity was assessed using CH-11, an agonistic anti-Fas-R IgM monoclonal antibody. The apoptosis-related molecules examined were the Fas-R, Bcl-2, Bax, and Fas-associated phosphatase 1 (FAP-1). Downregulation of Fas-R and upregulation of Bcl-2 in HOK-16B-BaP were observed in HOK-16B-BaP and HOK-16B-BaPT1. Bax was downregulated in HOK-16B, HOK-16B-BaP and HOK-16B-BaP-T1. The expression of FAP-1 was increased with progression towards malignancy. NHOK and HOK-16B were relatively sensitive to CH-11, whereas HOK-BaP and HOK-BaP-T1 were resistant to CH-11. Treatment of HOK-16B-BaP with antisense bcl-2 oligonucleotide rendered the cells more sensitive to CH-11-induced apoptosis. These data demonstrate that both the loss of p53 and carcinogen stimulation are associated with altered expression of Fas-R, Bcl-2 and FAP-1, although the loss of p53 is sufficient for altered expression of Bax. Thus, both HPV infection and smoking contribute to acquisition of anti-apoptotic characteristics by oral carcinomas.     

Antiproliferation effects of ponicidin on human myeloid leukemia cells in vitro

Ponicidin, an extract from the Chinese herb Rabdosia rubescens, is currently one of the most important traditional Chinese herbal medicines. Ponicidin has been reported to have anti-tumor effects on a large variety of malignant diseases. In this study, we investigated the anti-proliferation effects of ponicidin on human myeloid K562 and HL-60 cells. Cell viability was measured by MTT assay; cell apoptosis was assessed by flow cytometry, DNA fragmentation analysis and Hoechst 33258 staining. Caspase-3 and poly(ADP-ribose) polymerase (PARP) activation and Bax and Bcl-2 expression were detected by Western blot analysis. The results revealed that ponicidin could significantly inhibit the growth of K562 and HL-60 cells by induction of apoptosis. The suppression was both time- and dose-dependent. Cell apoptosis was observed clearly after the cells were treated with ponicidin for 48-72 h. Western blotting showed cleavage of the caspase-3 zymogen protein (32 kDa) with the appearance of its 17 kDa subunit, together with a cleaved 89-kDa fragment of 116 kDa PARP when apoptosis occurred. Bcl-2 expression was down-regulated while Bax expression up-regulated concurrently when the cells were treated with ponicidin for 24-48 h. Therefore, we conclude that ponicidin has significant anti-proliferation effects by induction of apoptosis on myeloid leukemia cells in vitro, down-regulation of Bcl-2, and up-regulation of Bax, and that activation of caspase-3 and PARP may be an important apoptosis-inducing mechanism. The results suggest that ponicidin may serve as a potential therapeutic agent for leukemia.     

Theophylline and cisplatin synergize in down regulation of BCL-2 induction of apoptosis in human granulosa cells transformed by a mutated p53 (p53 val135) and Ha-ras oncogene

Cisplatin is in common use in ovarian cancer therapy, although it is also implicated in cytotoxicity in normal tissue. We have examined the effect of cisplatin alone and in combination with theophylline, a phoshodiesterase inhibitor, on modulation of Bcl-2/Bax expression and induction of apoptosis in human granulosa cells transformed by stable transfection with mutant p53 plus Ha-ras. Theophylline elicited cell death only at relatively high concentrations with an EC50 of 200 microg/ml. Cisplatin exerted its lethal effect with an EC50 of 7 microM. In the presence of 15 or 50 microg/ml of theophylline (in the range used against asthma in humans), the EC50 for cisplatin was reduced to 2 microM or 1.2 microM, respectively. Using fluorescence-activated cell sorting analysis of DNA stained cells and the terminal deoxy-nucleotide tranferase-mediated dUTP nick end-labeling method, we found that even at concentrations of 0. 3 and 1 microM cisplatin, theophylline at 15 and 50 microg/ml increased the incidence of apoptosis in these cells by 3-5-fold, while theophylline alone induced extremely low apoptosis. Neither drug had any measurable effect on Bax protein expression. In contrast Bcl-2 protein expression levels were markedly reduced by theophylline and cisplatin in a dose-dependent manner. The combination of theophylline and cisplatin resulted in a further dramatic reduction in Bcl-2, under-scoring the pronounced synergy of these two drugs. These observations suggest that suppression of Bcl-2 expression may play an important role in mediating the synergistic effect of cisplatin and theophylline on induction of apoptosis in ovarian cancer cells.     

环氧化酶2抑制剂对宫颈癌 Hela 细胞中 HPV18- E6和 COX -2表达的影响

目的：探讨环氧化酶2抑制剂 Celecoxib 对宫颈癌细胞 Hela 中 HPV18- E6、COX -2表达及其细胞增殖和凋亡的影响。方法：用不同浓度 Celecoxib 处理 Hela 细胞株后,免疫细胞化学 SP 法检测 HPV18- E6和COX -2蛋白的表达变化。RT - PCR 检测 HPV18- E6及 COX -2 mRNA 表达的改变。MTT 法检测其对细胞增殖的影响。流式细胞仪测定细胞凋亡情况。Hoechst33258染色观察细胞的形态学变化。结果：Celecoxib 作用 Hela 细胞后 HPV18- E6和 COX -2基因 mRNA 及蛋白表达量明显低于对照组,且随着药物浓度增加表达呈梯度下降。各组之间差异具有显著性（P <0.05）,且两者之间具有显著相关性（P <0.01）。Celecoxib 抑制Hela 细胞增殖,作用呈量-效关系（P <0.05）。流式细胞仪显示各实验组凋亡率随浓度升高而增加,与对照组之间有显著差异（P <0.05）。Hoechst33258荧光染色显示经20μmol/ L 药物作用 Hela 细胞24h 后表现为典型调亡小体。结论：COX -2抑制剂 Celecoxib 可以同时下调宫颈癌 Hela 细胞中 HPV18- E6和 COX -2表达、抑制 Hela 细胞的增殖、促进其凋亡。     

Taxol-induced bcl-2 phosphorylation in ovarian cancer cell monolayer and spheroids

Expression of Bcl-2, Bax, p53 and induction of apoptosis were studied in cisplatin or Taxol treated monolayer and spheroid cultures of ovarian cancer cell lines (SKOV-3, UL-1, UL-3C). While cisplatin (15-75 microg/ml) induced apoptosis in monolayer and spheroid cultures, Taxol (100-800 nM) induced fragmentation in monolayers only. Cisplatin induced up to 5-fold DNA fragmentation in monolayers, while 3-fold (UL-3C, SKOV-3), and 1.5-fold (UL-1) in spheroids. Taxol treatment of monolayers resulted in the characteristic phosphorylation of Bcl-2, which was not demonstrated in spheroid cultures. Bax expression was reduced in spheroids following cisplatin or Taxol treatment, while p53 levels remained unchanged.