干扰小RNA沉默CAV1表达对人绒毛膜癌JEG-3细胞侵袭、迁移能力的影响及其作用机制研究

目的 探究干扰小RNA(siRNA)沉默小窝蛋白-1(CAV1)基因表达对人绒毛膜癌JEG-3细胞侵袭、迁移能力的影响及其可能的作用机制.方法 将人绒毛膜癌JEG-3细胞分为对照组(不进行转染)、阴性组(转染siRNA-NC)和siRNA-CAV1组(转染siRNA-CAV1).Transwell法检测下调CAV1表达对细胞侵袭、迁移能力的影响;实时定量PCR(qRT-PCR)检测转染细胞中CAV1 mRNA的表达水平;蛋白质印迹法(Western blot)检测细胞中CAV1、丝苏氨酸蛋白激酶(AKT)、雷帕霉素靶蛋白(MTOR)、核糖体p70S6激酶(p70S6K)、磷酸化AKT(p-AKT)、磷酸化MTOR(p-MTOR)、磷酸化p70S6K(p-p70S6K)蛋白的表达水平.结果 siRNA-CAV1组JEG-3细胞中CAV1 mRNA和蛋白的相对表达量均低于对照组(P﹤0.05);siRNA-CAV1组JEG-3细胞的侵袭数目、迁移数目均低于对照组(P﹤0.05);siRNA-CAV1组JEG-3细胞中AKT、MTOR、p70S6K以及磷酸化水平均低于对照组(P﹤0.05).结论 沉默CAV1表达可以抑制人绒毛膜癌JEG-3细胞的侵袭和迁移能力,该作用与AKT/MTOR/p70S6K信号通路有关.     

卵巢癌细胞PI3K/AKT通路与肾上腺髓质素促迁移作用的相关性研究

  目的  检测PI3K/AKT信号通路在肾上腺髓质素(AM)促卵巢癌细胞HO8910迁移中的作用。  方法  利用划痕实验检测外源性AM对卵巢癌细胞HO8910迁移功能的影响, 并且检测PI3K抑制剂Wortmannin对AM促进卵巢癌细胞迁移功能的干扰。为进一步研究AM对AKT磷酸化的影响, 应用蛋白印迹法检测细胞AKT蛋白磷酸化的表达, 应用整合素α5β1抑制性抗体(mAb)拮抗AM对卵巢癌细胞AKT磷酸化作用。  结果  外源性AM处理的卵巢癌细胞12 h迁移率(62.83±4.46)%明显高于正常卵巢癌细胞的迁移率(30.26±1.55)%(P < 0.001), PI3K抑制剂Wortmannin干扰1 h后再用Am处理12 h, 细胞迁移率为(40.44±0.88)%, 明显低于单纯应用AM刺激的细胞(P=0.001)。AM可以促进卵巢癌细胞迁移(P < 0.001), PI3K抑制剂Wortmannin可以拮抗AM的促迁移作用(P=0.001)。AM可以促进细胞AKT蛋白磷酸化, Wortmannin、整合素α5β1抑制性抗体均可以干扰AM对AKT蛋白磷酸化作用。  结论  在卵巢癌HO8910细胞中, PI3K/AKT的活化是AM促进卵巢癌细胞迁移重要机制, 而整合素α5β1可能作为感受器参与AM促进细胞PI3K/AKT通路的活化。      

miR-182激活PI3K/AKT信号通路促进肝癌HepG2细胞增殖、侵袭和迁移的机制研究

目的:探讨miR-182通过PI3K/AKT信号通路对肝癌HepG2细胞增殖、侵袭和迁移的影响及其机制。方法:将体外培养的HepG2细胞分为对照组(未转染)、阴性组(转染阴性对照)、模拟物组(转染miR-182模拟物)和模拟物+抑制剂组(转染miR-182模拟物后,加入PI3K/AKT信号通路抑制剂LY294002),采用RT-PCR检测各组细胞中miR-182的表达水平,Western blot检测各组细胞中PI3K/AKT信号通路相关蛋白PI3K、p-PI3K、AKT、p-AKT和MMP-9、c-Myc、VEGF蛋白的表达,采用MTT法、克隆形成实验和Transwell小室分别检测各组细胞的增殖、侵袭和迁移能力。结果:与对照组相比,模拟物组细胞的存活率、克隆形成率和侵袭细胞数、迁移细胞数均明显升高,细胞中p-PI3K、p-AKT和MMP-9、c-Myc、VEGF蛋白的表达水平也均明显上升(P<0.05);而阴性组和对照组细胞相比无显著性差异(P>0.05)。与模拟物组相比,模拟物+抑制剂组细胞的存活率、克隆形成率和侵袭细胞数、迁移细胞数明显降低,细胞中p-PI3K、p-AKT和MMP-9、c-Myc、VEGF蛋白的表达水平也均明显下降(P<0.05)。结论:miR-182可通过激活PI3K/AKT信号通路上调MMP-9、c-Myc、VEGF蛋白的表达促进肝癌细胞的增殖、侵袭和迁移。     

siRNA沉默STMN1基因抑制肺癌细胞增殖与侵袭的机制探讨

目的:观察下调肺癌细胞中STMN1基因的表达对癌细胞增殖、侵袭及PI3K/AKT信号通路的影响。方法:以人正常肺细胞MRC-5作为对照,通过Western bloting检测人肺癌A549、SPC-A1和H322细胞中STMN1的蛋白表达;STMN1的siRNA转染A549细胞为实验组,另设空白组和阴性组,转染48 h后,Western bloting检测转染效果;CCK8法及Transwell小室分别检测细胞的增殖及侵袭能力;Western bloting检测增殖细胞核抗原（PCNA）、基质金属蛋白酶2（MMP-2）、磷脂酰肌醇3-激酶（PI3K）、磷酸化的丝氨酸苏氨酸激酶（p-AKT）的蛋白表达。结果:STMN1在肺癌A549、SPC-A1和H322细胞中的蛋白表达均显著高于在MRC-5细胞中的表达（P<0.05）,选择A549细胞为研究对象。转染STMN1 siRNA的A549细胞STMN1的蛋白表达显著低于空白组（P<0.05）。与空白组比较,实验组细胞增殖及侵袭能力均显著降低,PCNA、MMP-2、PI3K、p-AKT蛋白表达均显著降低（P<0.05）。结论:siRNA沉默STMN1的表达通过下调PI3K/AKT信号通路降低肺癌细胞增殖及侵袭能力。     

PI3K/AKT信号通路阻断药联合小檗碱对前列腺癌DU145细胞生长的抑制作用

目的 探讨采用磷脂酰肌醇3-激酶(PI3K)抑制药——LY294002抑制磷脂酰肌醇-3-激酶/丝苏氨酸蛋白激酶(PI3K/AKT)信号通路联合小檗碱对前列腺癌DU145细胞生长的抑制作用.方法 采用MTT法检测细胞增殖情况;采用流式细胞仪检测细胞凋亡率和细胞周期分布情况;采用Western blot检测细胞中PI3K、p-AKT、cyclin D1、bcl-2、BAX蛋白表达情况.结果 随着小檗碱作用浓度的增加,DU145细胞的增殖率逐渐降低;不同浓度小檗碱与LY294002联合处理对DU145细胞增殖的抑制作用均较相同浓度小檗碱单独处理增强(P﹤0.05).与空白对照组相比,小檗碱组DU145细胞的凋亡率增高(P﹤0.05),G0/G1期细胞所占比例增高(P﹤0.05),PI3K、p-AKT、cyclin D1、bcl-2蛋白表达水平均下调(P﹤0.05),BAX蛋白表达水平上调(P﹤0.05).与小檗碱组和空白对照组相比,小檗碱+LY294002组DU145细胞的凋亡率增高(P﹤0.05),G0/G1期细胞所占比例增高(P﹤0.05),PI3K、p-AKT、cyclin D1、bcl-2蛋白表达水平均下调(P﹤0.05),BAX蛋白表达水平上调(P﹤0.05).结论 小檗碱能够抑制DU145细胞增殖,并促进细胞凋亡和细胞周期阻滞,采用LY294002阻断PI3K/AKT信号通路能够明显增强小檗碱对前列腺癌DU145细胞生长的抑制作用.     

姜黄素通过PI3K/AKT/mTOR通路抑制TGF-β1诱导的肺癌细胞上皮间质转化

摘 要：［目的］ 探讨姜黄素对TGF-β诱导的肺癌A549细胞上皮间质转化、侵袭转移的影响及其可能的机制。［方法］ 通过转化生长因子TGF-β1诱导肺癌细胞株A549发生上皮间质转化;利用不同浓度姜黄素干预由TGF-β1诱导的肺癌 A549细胞,倒置显微镜观察细胞形态变化,细胞划痕实验、Transwell 侵袭实验检测细胞迁移及侵袭能力变化,Western blot法检测上皮表型标记蛋白E-cadherin和间质表型标记蛋白N-cadherin、Vimentin的表达及PI3K/AKT/mTOR信号通路中AKT、mTOR磷酸化的情况,并利用PI3K抑制剂LY290004、mTOR抑制剂Rapamycin通过上述方法对姜黄素的作用进行印证。［结果］ 与对照组相比,姜黄素显著增加A549细胞E-cadherin的表达,抑制N-cadherin和Vimentin蛋白及TGF-β1刺激p-AKT和p-mTOR的表达,且呈明显的剂量—时间依赖关系;同时抑制TGF-β诱导的侵袭迁移。［结论］ 姜黄素可通过PI3K/AKT/mTOR通路明显抑制TGF-β1诱导的肺癌A549细胞上皮间质转化,降低其侵袭迁移能力。     

达沙替尼基于PI3K/AKT信号通路调节乳腺癌细胞生物学行为

目的:基于PI3K/AKT信号通路探讨达沙替尼(dasatinib, DAS)对乳腺癌MCF-7细胞生物学行为的影响。方法:分别使用噻唑蓝(methyl thiazolyl tetrazolium, MTT)法、Transwell法、流式细胞术和Western blotting法检测DAS不同浓度(0、2、6、10μmol/L)作用下MCF-7细胞增殖、侵袭和迁移、细胞凋亡以及PI3K/AKT信号通路相关蛋白表达情况。同时设置对照组(溶媒对照)、DAS组(DAS 10μmol/L)、PI3K抑制剂组(LY294002 20μmol/L)、联合组(DAS 10μmol/L+LY294002 20μmol/L),比较各组细胞增殖、侵袭和迁移、细胞凋亡以及PI3K/AKT信号通路相关蛋白表达情况。结果:随着DAS作用浓度的升高,MCF-7细胞增殖抑制率和细胞凋亡率升高(P<0.05),侵袭细胞数、迁移细胞数和PI3K、p-PI3K、p-AKT蛋白表达降低(P<0.05)。与对照组相比,DAS组、PI3K抑制剂组、联合组MCF-7细胞增殖抑制率和细胞凋亡率升高(P<0.05)...     

siRNA靶向沉默MALAT-1对鼻咽癌细胞增殖、凋亡及PI3K/AKT通路的影响

目的:探究siRNA靶向沉默MALAT-1对鼻咽癌细胞增殖、凋亡及PI3K/AKT通路的影响。方法:分别以10、20、30、40、50 nmol/L浓度的siRNA靶向沉默体外培养的人鼻咽癌细胞株CNE的基因MALAT-1,以实时荧光定量（qRT-PCR）分别在24、48 h后检测MALAT-1 mRNA表达水平,筛选合适的siRNA作用浓度和时间。将CNE细胞分为三组:空白对照组、siRNA阴性对照组和siRNA组,siRNA处理细胞后,采用CCK-8法检测细胞增殖情况,采用流式细胞技术检测细胞凋亡情况,Western blot 检测各组细胞凋亡相关蛋白（Bcl-2、Bax、caspase-3）及PI3K/AKT通路蛋白（PI3K、ATK、p-AKT）表达情况。结果:选定30 nmol/L浓度的siRNA作用于CNE细胞48 h;siRNA处理细胞后,与空白对照组相比,siRNA组细胞增殖率明显降低,凋亡率明显升高,Bax、caspase-3蛋白表达明显升高,Bcl-2、PI3K、p-AKT蛋白表达明显降低,差异均有统计学意义（P＜0.05）;AKT蛋白表达无明显变化,差异无统计学意义（P＞0.05）。siRNA阴性对照组各指标均无明显变化,差异无统计学意义（P＞0.05）。结论:siRNA可靶向沉默MALAT-1,抑制鼻咽癌细胞增殖,促进其凋亡,可能是通过抑制PI3K/AKT通路实现的。     

MiR-202靶向调节EGFR介导的PI3K/AKT信号通路在紫杉醇治疗卵巢癌中的机制研究

摘 要：［目的］ 探讨miR-202靶向调节EGFR介导的PI3K/AKT信号通路在紫杉醇治疗卵巢癌中的作用机制。［方法］ 以人卵巢癌细胞株A2780细胞作为研究对象,分别转染miR-NC、miR-202 mimics及shEGFR。采用MTT和Transwell实验检测各组细胞增殖、迁移及侵袭能力。采用qRT-PCR检测细胞中miR-202和EGFR mRNA表达量。采用Western blot检测EGFR、p-PI3K、PI3K、p-AKT和AKT蛋白水平。［结果］ qRT-PCR结果显示,与正常人卵巢上皮细胞HOSEpiC相比,miR-202在卵巢癌细胞A2780/WT 及A2780/PTX中明显低表达（P<0.05）;EGFR mRNA水平显著性上调（P<0.05）。转染miR-202 mimics后,卵巢癌细胞中miR-202相对表达量显著性高于miR-NC组和shEGFR组（P<0.05）;而miR-202 mimics组和shEGFR组EGFR mRNA含量显著性低于miR-NC组（P<0.05）。过表达miR-202及转染shEGFR后,miR-202 mimics组和shEGFR组细胞增殖能力较miR-NC组均显著性降低（P<0.05）;迁移细胞和侵袭数目也随之减少（P<0.05）;且对紫杉醇的半数抑制浓度IC50降低（P<0.05）。免疫印迹测定结果显示,miR-202 mimics组和shEGFR组中EGFR蛋白、p-PI3K/PI3K及p-AKT/AKT磷酸化水平较miR-NC组明显下调（P<0.05）。［结论］ miR-202能靶向调节EGFR表达,并且影响卵巢癌细胞的增殖、迁移及侵袭过程,其作用机制是通过抑制EGFR下游PI3K/AKT信号通路从而发挥抑癌作用,为临床治疗提供了新方向。     

LASP1基因对人结直肠癌LOVO细胞增殖、迁移和凋亡的影响及其机制

目的 探讨LASP1基因表达对人结肠癌（LOVO）细胞增殖、迁移以及侵袭能力的影响及其作用机制。方法 分别构建LASP1过表达质粒和LASP1干扰质粒转染LOVO细胞，qRT-PCR验证LASP1mRNA转染结果。MTT法、Tunel染色分别检测细胞增殖活性和细胞的凋亡情况，细胞划痕和Transwell实验检测细胞迁移和侵袭能力。Westernblot测定细胞LASP1、p-FAK/FAK、p-AKT/AKT蛋白表达。结果 质粒转染成功。LASP1过表达的LOVO细胞的增殖、迁移和侵袭能力增加，细胞凋亡率降低，细胞中LASP1、p-FAK/FAK、p-AKT/AKT蛋白表达升高（P<0.01）。而敲减LOVO细胞中LASP1的表达后，细胞增殖、迁移和侵袭能力减弱，细胞凋亡率增加，细胞中LASP1、p-FAK/FAK、p-AKT/AKT蛋白表达降低（P<0.01）。结论 LASP1可正向调控FAK/AKT信号通路，促进LOVO细胞的增殖、迁移以及侵袭能力。     

Increased activation of PI3K/AKT signaling pathway is associated with cholangiocarcinoma metastasis and PI3K/mTOR inhibition presents a possible therapeutic strategy

Phosphatidylinositol 3-kinase (PI3K) signaling plays a critical role in cholangiocarcinoma (CCA), as well as anti-cancer drug resistance and autophagy, the type II program cell death regulation. In this work, we aimed to: (1) determine the expression levels of several key components of PI3K signaling and (2) evaluate whether NVP-BEZ235, a novel dual PI3K/mTOR inhibitor, could inhibit CCA cell growth. Immunohistochemistry for p85α, p110α, AKT, p-AKT (T308), mTOR, p-mTOR (S2448), GSK-3β, p-GSK-3β (S9), PTEN, and p-PTEN (S380, T382/383) was performed in 30 CCA patients. Western blotting was used to analyze PTEN and p-PTEN expression in the cell lines (KKU-OCA17, KKU-100, KKU-M055, KKU-M139, KKU-M156, KKU-M213, and KKU-M214). The effects of NVP-BEZ235 on CCA cells were evaluated using a growth inhibition assay, flow cytometer and migration assay. Increased activation of PI3K/AKT signaling was reproducibly observed in the CCA tissues. The expression of p85α, mTOR, and GSK-3β was significantly correlated with metastasis. Interestingly, PTEN suppression by loss of expression or inactivation by phosphorylation was observed in the majority of patients. Furthermore, NVP-BEZ235 effectively inhibited CCA cell growth and migration through reduced AKT and mTOR phosphorylation and significantly induced G1 arrest without apoptosis induction, although increase autophagy response was observed. In conclusion, the constitutive activation of PI3K/AKT pathway in CCA is mainly due to PTEN inactivation by either loss of expression or phosphorylation along with an increased expression in its pathway components heralding a poor prognosis for CCA patients. This work also indicates that inhibition of PI3K and mTOR activity by the inhibitor NVP-BEZ235 has anti-cancer activity against CCA cells which might be further tested for CCA treatment.     

High frequency of loss of PTEN expression in human solid salivary adenoid cystic carcinoma and its implication for targeted therapy

Salivary gland tumor (SGT) is one of the least studied cancers due to its rarity and heterogeneous histological types. Here, we reported that loss of PTEN expression was most frequently found in the poorly differentiated, high grade solid adenoid cystic carcinomas. Loss of PTEN expression correlated with activation of mTOR by increased phosphorylated S6 ribosome protein. We further functionally studied the role of PTEN in a pair of human SACC cell lines, SACC-83 and SACC-LM. Reduced PTEN level was correlated with the metastasis potential. When we knocked down PTEN in the SACC-83 cell line, we observed increased proliferation and enhanced migration/invasion in vitro, and increased tumor size in vivo. We further tested the therapeutical effect by applying a PI3K/mTOR inhibitor NVP-BEZ235 to both SACC cell lines. Decreased cell proliferation, increased apoptosis, as well as reduced cell migration/invasion were observed in both cell lines upon the NVP-BEZ235 treatment. Moreover, the NVP-BEZ235 treatment in a SGT xenograft mouse model significantly reduced primary tumor size and lung metastasis. Taken together, our results demonstrated that PTEN is a potent tumor suppressor in human SGTs, and targeting PI3K/mTOR pathway may be effective in the targeted therapy for human SGT patients with loss of PTEN expression.     

川芎嗪通过PTEN/AKT通路抑制外阴鳞癌SW962细胞增殖、侵袭和转移

目的:研究和探讨川芎嗪对人外阴鳞癌细胞SW962细胞功能（增殖、凋亡、转移、侵袭）的影响以及机制。方法:将不同浓度川芎嗪配置而成的培养基干预处理外阴鳞癌SW962细胞。MTT法检测川芎嗪梯度浓度变化和处理时间变化对SW962细胞增殖和生存率的影响；流式细胞术检测川芎嗪梯度浓度变化对SW962细胞凋亡的影响；Transwell小室实验检测川芎嗪梯度浓度变化对SW962细胞转移和侵袭的影响；划痕实验检测川芎嗪梯度浓度变化对SW962细胞转移的影响；Western blot电泳法检测川芎嗪对PTEN、AKT、p-AKT、cyclinD1蛋白表达的影响。结果:川芎嗪显著抑制SW962细胞增殖（P＜0.05），诱导SW962细胞凋亡增加细胞凋亡率（P＜0.05），抑制SW962细胞转移和侵袭（P＜0.05）。Western blot结果显示，川芎嗪处理细胞可以增加抑癌基因PTEN的表达，降低p-AKT和cyclinD1蛋白的表达（P＜0.05）。结论:川芎嗪可以通过影响PTEN/AKT/cyclinD1信号通路抑制外阴鳞癌细胞SW962的增殖，诱导凋亡，抑制SW962细胞转移和侵袭。     

细胞角蛋白13通过PTEN抑制PI3K/AKT/mTOR通路增强鼻咽癌HNE1细胞放疗敏感性

目的:探讨细胞角蛋白13(cytokeratin13,CK13)对鼻咽癌HNE1细胞放疗敏感性的影响及其作用机制.方法:将HNE1细胞分为对照组、anti-CK13#a组及anti-CK13#b组(敲减CK13)、对照组+西罗莫司处理组(100nmol/L的西罗莫司处理1 h)、anti-CK13#a+西罗莫司处理组(...     

Effect of BRAF-mediated PI3K/Akt/mTOR pathway on biological characteristics and chemosensitivity of NSCLC A549/DDP cells

The present study aimed to explore the biological characteristics of non-small cell lung cancer (NSCLC) cells and the mechanism of chemosensitivity through the role of the PI3K/Akt/mTOR signaling pathway mediated by BRAF gene silencing. Following cell transfection and grouping, an MTT assay detected the activity of NSCLC cells, a scratch wound test assessed the migration ability, flow cytometry using PI staining detected the cell cycle phase, TUNEL and flow cytometry through Annexin V-PI staining assessed the apoptosis, and colony formation was used to detect the sensitivity of lung cancer cells to cisplatin chemotherapy. Furthermore, the relative expression levels of BRAF, PTEN, PI3K, mTOR mRNA were assessed by RT-qPCR, and the protein expression levels of BRAF, PTEN, PI3K, phosphorylated (p)-PI3K, Akt, p-Akt, mTOR, p-mTOR, cisplatin resistance-related enzymes ERCC1 and BRCA1, apoptotic proteins Bax and Bcl-2 were assessed by western blotting. Compared with the control group and NC group, there were differences in decreased BRAF mRNA expression levels in the small interfering (si)BRAF group and siBRAF + IGF-1 group (both P<0.05). In addition, compared with the control group, the siBRAF, NVP-BEZ235 and siBRAF + NVP-BEZ235 groups had significant decreased cell viability at 2–6 days, decreased migration ability, shortened proportion of S-phase cells, increased proportion of G₁/G₀-phase cells, increased apoptosis rate, decreased number of colony-forming cells, decreased mRNA expression of PI3K, Akt and mTOR, increased PTEN mRNA expression, decreased protein expression levels of PI3K, p-PI3K, Akt, p-Akt, mTOR, p-mTOR, ERCC1, BRCA1 and Bcl-2, and increased protein expression levels of PTEN and Bax (all P<0.05); and more obvious trends were revealed in the siBRAF + NVP-BEZ235 group (all P<0.05); whereas opposite results were detected in the siBRAF + IGF-1 group when compared with the siBRAF group and NVP-BEZ235 group (all P<0.05). Silencing of BRAF gene expression to inhibit the activation of the PI3K/Akt/mTOR signaling pathway exerted a synergistic effect decreasing cell viability, inhibiting the cell cycle and migration, increasing the apoptosis rate, decreasing the number of colony-forming cells and increasing chemosensitivity of NSCLC. Activation of the PI3K/Akt/mTOR signaling pathway may reverse the role of silencing of BRAF gene expression, providing a potential approach for improving the chemosensitivity of NSCLC. The present study for the first time, to the best of our knowledge, clarified the possible mechanism of NSCLC cell biological characteristic changes and chemosensitivity from the perspective of BRAF gene silencing and PI3K/Akt/mTOR signaling pathway activation, providing a potential reference for suppressing tumor aggravation and improving the therapeutic outcomes of NSCLC at the genetic level.     

Growth inhibition by NVP-BEZ235, a dual PI3K/mTOR inhibitor, in hepatocellular carcinoma cell lines

Dysregulation of the phosphatidylinositol-3-kinase (PI3K)/mammalian target of rapamycin (mTOR) pathway frequently occurs in human tumors, and is therefore considered to be a good molecular target for treatment. In hepatocellular carcinoma (HCC), overexpression of p-Akt and decrease of PTEN expression have been reported. NVP-BEZ235 is a novel dual inhibitor of PI3K and mTOR; however, its effect on HCC has not been documented. Consequently, we investigated the effects of NVP-BEZ235 on the PLC/PRF/5, HLE, JHH7 and HepG2 HCC cell lines in vitro and in vivo. NVP-BEZ235 decreased the levels of p-Akt and p-p70S6K and inhibited cell proliferation in all HCC cell lines in a dose-dependent manner. Flow cytometric analysis revealed that inhibition of cell proliferation by NVP-BEZ235 was accompanied by G1 arrest in all cell lines, and that NVP-BEZ235 induced apoptosis in PLC/PRF/5 and HLE cells. Tumor growth was suppressed without body weight loss when NVP-BEZ235 was orally administered to JHH-7 tumor-bearing mice for 11 days. These results suggest that NVP-BEZ235 is a potential new candidate for targeted HCC therapy.     

EphB1通过PI3K/AKT信号通路促进食管鳞状细胞癌EC-9706细胞增殖、迁移、侵袭并抑制其凋亡

目的:研究促红细胞生成素产肝细胞受体B1(erythropoietin-producing human hepatocellular receptor B1,EphB1)对食管鳞状细胞癌EC-9706细胞增殖、迁移、侵袭及凋亡的影响,并探索其可能的作用机制。方法:qRT-PCR法分析40对食管鳞状细胞癌手术患者的癌组织及邻近正常组织中EphB1表达情况,并分析其临床特征。在EC-9706细胞中分别转染si-EphB1 RNA和oe-EphB1 RNA及其阴性对照。通过qRT-PCR和蛋白免疫印迹实验检测转染效率;CCK-8实验分析EphB1对细胞活力的影响;Hoechst 33258染色和流式细胞学实验检测细胞凋亡;划痕愈合实验及Transwell侵袭实验明确细胞迁移及侵袭能力;蛋白免疫印迹实验检测EphB1蛋白、增殖相关蛋白［增殖细胞核抗原（proliferating cell nuclear antigen,PCNA）］、凋亡相关蛋白［Bad、Bcl-2、Caspase 3 及剪切型-Caspase 3（cleaved-Caspase 3）］、侵袭转移相关蛋白［基质金属蛋白酶9(matrix metalloproteinase-9,MMP-9)、基质金属蛋白酶2(matrix metalloproteinase-2,MMP-2）、Snail、波形蛋白(Vimentin)、N-cadherin、E-cadherin］以及PI3K/AKT信号通路相关蛋白（PI3K、AKT、p-AKT）的表达水平。结果:EphB1在食管鳞状细胞癌组织及细胞系中高表达(P均＜0.05),EphB1的表达水平与食管鳞状细胞癌患者的TNM分期、有无淋巴结转移和远处转移具有显著相关性(P均＜0.05)。与对照组相比,通过细胞转染技术沉默EphB1和过表达EphB1使EC-9706细胞的增殖、迁移、侵袭能力明显降低或增强,并诱导或抑制细胞凋亡(P均＜0.05)。在蛋白水平上,si-EphB1和oe-EphB1处理EC-9706细胞48 h后,增殖相关蛋白PCNA蛋白表达水平分别显著降低或增加（P均＜0.05）,并分别增加或降低促凋亡相关蛋白Bad、cleaved-Caspase 3的表达水平（P均＜0.05）,下调或上调抗凋亡蛋白Bcl-2、Caspase 3的蛋白表达（P均＜0.05）,抑制或促进侵袭转移相关蛋白MMP-9、MMP-2、Snail、Vimentin、N-cadherin的蛋白活性,但却上调或下调 E-cadherin的表达水平（P均＜0.05）。同时,Western blotting实验结果还证实EphB1可诱导食管鳞状细胞癌EC-9706细胞中通路蛋白PI3K、p-AKT的活性增强（P均＜0.05）。结论:EphB1可能通过调控PI3K/AKT信号通路促进食管鳞状细胞癌EC-9706细胞的增殖、迁移及侵袭,并抑制其凋亡。     

XIAP基因对食管癌细胞黏附、侵袭和迁移能力的影响

目的:探讨沉默X连锁凋亡抑制蛋白（XIAP）基因表达对食管癌细胞黏附、侵袭和迁移能力的影响及机制。方法:参照LipofectamineTM2000说明将设计合成的XIAP特异性siRNA（si-XIAP）转染人食管癌EC9706细胞,将转染阴性对照siRNA(NC组）和仅加入脂质体的空白细胞作为两个对照组,siRNA转染48 h,通过Western blotting检测XIAP、AKT、p-AKT、E-cadherin和MMP-2蛋白表达;通过MTT法、Transwell法分别检测细胞黏附、侵袭和迁移能力;MTT法检测转染siRNA后24 h、48 h和72 h的细胞增殖。结果:XIAP特异性siRNA转染后,EC9706细胞XIAP表达明显降低,与空白组比较差异有统计学意义（P<0.05）。与空白组比较,si-XIAP组细胞增殖明显降低,黏附率明显升高,侵袭和迁移能力明显降低,p-AKT和MMP-2表达明显降低,E-cadherin表达明显升高（P<0.05）。结论:沉默XIAP基因可增强食管癌细胞黏附率,抑制侵袭和迁移能力,机制与抑制PI3K/AKT信号通路有关。