银杏内酯B通过阻抑PI3K/Akt/mTOR信号通路抑制胃癌HGC-27 细胞的恶性生物学行为

目的：探讨银杏内酯B（GKB）是否通过阻抑PI3K/Akt/mTOR信号通路抑制胃癌HGC-27细胞的增殖、凋亡、迁移及侵袭。方法：将HGC-27细胞分为对照、GKB低剂量（100 mg/L）、GKB高剂量（200 mg/L）、GKB高剂量（200 mg/L）+740Y-P（PI3K激活剂）、Ly294002（PI3K抑制剂）组。采用MTT、Edu、FCM、Transwell实验分别检测各组细胞的增殖、凋亡、迁移和侵袭能力,qPCR和WB法分别检测各组细胞中PI3K mRNA、Akt mRNA、mTOR mRNA和Ki-67、caspase-3、p-PI3K/PI3K、p-Akt/Akt、p-mTOR/mTOR蛋白的表达。构建胃癌HGC-27细胞裸鼠移植瘤模型,观察GKB对移植瘤生长的影响,WB法检测移植瘤组织中Ki-67、caspase-3、p-PI3K/PI3K、p-Akt/Akt、p-mTOR/mTOR蛋白的表达。结果：体外实验结果表明,与对照组相比,GKB低剂量组、GKB高剂量组、Ly294002组HGC-27细胞的增殖活力及细胞增殖率、迁移和侵袭细胞数,PI3K、Akt、mTOR mRNA表达,以及Ki-67、p-PI3K/PI3K、p-Akt/Akt、p-mTOR/mTOR蛋白表达均显著降低（均P<0.05）;细胞凋亡率、caspase-3蛋白表达均显著升高（均P<0.05）;740Y-P可部分逆转GKB对HGC-27细胞的抑制作用（均P<0.05）。荷瘤裸鼠实验结果显示,GKB可显著抑制HGC-27细胞裸鼠移植瘤的生长（P<0.05）,且可下调PI3K/Akt/mTOR通路相关蛋白的表达。结论：GKB可通过阻抑PI3K/Akt/mTOR信号通路而抑制胃癌HGC-27细胞增殖、迁移与侵袭并促进其凋亡。     

山柰酚通过Met/PI3K/Akt/mTOR通路诱导非小细胞肺癌NCI-H1650细胞发生自噬进而影响其增殖

目的：探讨山柰酚诱导人非小细胞肺癌（NSCLC）NCI-H1650细胞发生自噬及其机制。方法：常规培养NCI-H1650细胞，用不同浓度山柰酚处理细胞，用CCK-8法、MTT法以及EdU法检测山柰酚对NCI-H1650细胞增殖能力的影响，用自噬双标记腺病毒mCherry-EGFR-LC3感染实验检测山柰酚对NCI-H1650细胞发生自噬的影响，用WB法检测山柰酚处理后NCI-H1650细胞中自噬相关蛋白及Met/PI3K/Akt/mTOR信号通路相关蛋白的表达，用qPCR法检测山柰酚处理后NCI-H1650细胞中Met mRNA的表达。采用荧光素酶标记A549-luc细胞建立裸鼠移植瘤模型后用山柰酚进行处理，用活体动物成像技术观察移植瘤生长情况，用WB法检测移植瘤组织中自噬相关蛋白以及Met/PI3K/Akt/mTOR信号通路相关蛋白的表达。结果：山柰酚能显著抑制NCI-H1650细胞的增殖能力（P<0.05），山柰酚处理后NCI-H1650细胞内的自噬小体数量明显增加（P<0.05）、自噬标志蛋白LC3B和beclin1表达均明显上调（均P<0.05）、P62表达明...     

异莲心碱通过PI3K/Akt/mTOR信号通路影响结肠癌SW480细胞增殖、 凋亡和自噬

目的：探讨异莲心碱（Iso）通过PI3K/Akt/mTOR信号通路对结肠癌SW480细胞增殖、凋亡和自噬的影响。方法：用 10、20和40 μmol/L的Iso处理结肠癌SW480细胞,CCK-8法、流式细胞术和WB法分别检测Iso对细胞增殖活力、凋亡和自噬相关 蛋白LC3Ⅰ、LC3Ⅱ、p62表达的影响。然后,用20 μmol/L的Iso和25 μmol/L的PI3K激活剂740 Y-P分别处理SW480细胞,将细 胞分为对照组、740 Y-P组、Iso组和Iso+740 Y-P组,流式细胞术、WB法检测Iso和740 Y-P对各组细胞凋亡及细胞中LC3Ⅰ、LC3Ⅱ、 p62、PI3K、p-PI3K、 mTOR和p-mTOR蛋白表达的影响。结果：10、20和40 μmol/L的Iso处理后,SW480细胞增殖活力均显著下 降（均P<0.05）,细胞凋亡率均显著升高（均P<0.05）,LC3Ⅱ/LC3Ⅰ表达均显著上调（均P<0.05）,p26蛋白表达显著下调（P<0.05）。 Iso和740 Y-P处理后,与对照组相比,740 Y-P 组细胞凋亡率、LC3Ⅱ/LC3Ⅰ表达均显著下降（均P<0.05）,p26、p-PI3K/PI3K和 p-mTOR/mTOR 表达均显著升高（均 P<0.05）;Iso 组 细胞凋亡率、LC3Ⅱ/LC3Ⅰ表达升高（均 P<0.05）,p26、p-PI3K/PI3K和 p-mTOR/mTOR 表达均显著下降（均 P<0.05）;与 740 Y-P 组相比,Iso+740 Y-P 组细胞凋亡率、LC3Ⅱ/LC3Ⅰ表达升高（P<0.05）, p26、p-PI3K/PI3K和p-mTOR/mTOR表达均显著下降（均P<0.05）;与Iso组相比,Iso+740 Y-P组细胞凋亡率、LC3Ⅱ/LC3Ⅰ表达下 降（均P<0.05）,p26、p-PI3K/PI3K和p-mTOR/mTOR表达均显著升高（均P<0.05）。结论：Iso通过抑制PI3K/Akt/mTOR信号通路 抑制结肠癌SW480细胞增殖并诱导细胞凋亡和自噬。     

鸦胆子油乳剂对食管鳞状细胞癌TE-1细胞增殖、凋亡和自噬的影响及其可能的机制

目的：探讨鸦胆子油乳剂（BJOE）对食管鳞状细胞癌TE-1细胞增殖、凋亡和自噬的影响及其可能的机制。方法：按干预措施的不同,将TE-1细胞分为对照组、RAPA（自噬激动剂）组、740Y-P（PI3K激活剂）组、BJOE 组、BJOE+RAPA组和BJOE+740Y-P 组。采用FCM、克隆形成、Transwell 实验检测细胞凋亡、增殖、迁移和侵袭能力,qPCR 法检测细胞中PI3K、Akt、mTOR、LC3Ⅰ、LC3Ⅱ、p62、Beclin 1、caspase-3的mRNA表达,WB法检测PI3K、Akt、mTOR及其磷酸化、LC3Ⅱ/Ⅰ、p62、Beclin 1、caspase-3的蛋白表达。结果: 与对照组比较,RAPA组和BJOE 组细胞凋亡率均显著升高（均P<0.01）,细胞克隆形成率、迁移和侵袭能力均显著降低（均P<0.01）,细胞中PI3K、Akt、mTOR 的mRNA 和蛋白磷酸化水平均显著降低（均P<0.05）,p62的mRNA 和蛋白水平显著降低（均P<0.01）,LC3Ⅱ/Ⅰ、Beclin 1和caspase-3的mRNA和蛋白水平显著升高（均P<0.05）,740Y-P 组的结果则相反（均P<0.05）;与RAPA组或740Y-P 组比较,BJOE+RAPA组或BJOE+740Y-P 组细胞凋亡率显著升高（均P<0.01）,克隆形成率、细胞侵袭和迁移能力显著降低（均P<0.01）,PI3K、Akt、mTOR的mRNA和蛋白磷酸化水平均显著降低（均P<0.05）,p62 的mRNA和蛋白水平均显著降低（均P<0.05）,LC3Ⅱ/Ⅰ、Beclin 1 和caspase-3 mRNA和蛋白水平显著升高（均P<0.05）。结论: BJOE显著抑制TE-1细胞增殖、迁移、侵袭并促进细胞凋亡与自噬,其机制可能与抑制PI3K/Akt/mTOR信号通路的激活有关。     

IL-17A通过PI3K/Akt通路促进肺癌A549细胞的增殖、迁移和侵袭

目的:研究IL-17A对肺癌A549细胞增殖、迁移和侵袭的影响及其分子机制。方法:使用不同浓度的IL-17A（0、1、10、100 ng/mL）分别作用于A549细胞。CCK-8检测IL-17A对A549细胞增殖的影响;划痕修复实验和Transwell细胞侵袭实验检测IL-17A对A549细胞迁移和侵袭的影响;Western blot检测IL-17A对PI3K/Akt信号通路和凋亡通路蛋白表达的影响;流式细胞术检测IL-17A对A549细胞凋亡的影响;IL-17A和PI3K抑制剂LY294002共同作用于A549细胞,划痕修复实验观察对A549细胞迁移的影响。结果:IL-17A可以促进A549细胞的增殖,其对A549细胞增殖的促进作用随着IL-17A浓度的增加而增加。IL-17A能够促进PI3K和Akt磷酸化蛋白表达、抑制凋亡蛋白caspase3的表达,并抑制A549细胞的凋亡。LY294002可以明显减弱IL-17A对A549细胞迁移的促进作用。结论:IL-17A通过PI3K/Akt通路抑制A549细胞的凋亡,从而促进A549细胞的增殖、迁移和侵袭。     

顺铂通过抑制PI3K/AKT/mTOR信号通路诱导子宫内膜癌Ishikawa细胞自噬

目的：探讨顺铂对子宫内膜癌Ishikawa细胞自噬的影响,并初步探讨PI3K/AKT/mTOR信号通路在其中的作用。方法：透射电镜观察自噬泡形成,免疫荧光检测微管相关蛋白1轻链3融合蛋白II（microtubule-associated protein 1 light chain 3II,LC3II） 的荧光聚集情况。采用Westerblot检测mTOR通路中的PI3K、AKT及mTOR蛋白的表达。结果：顺铂（20μg/mL）能诱导Ishikawa细胞发生自噬,其中24h组明显高于12h组（P<0.05）;与对照组（20μg/mL-0h组）相比较,自噬相关蛋白-LC3的表达随着时间延长表达增加（P<0.05）。磷酸化AKT1、磷酸化mTOR及PI3Kp85蛋白表达水平随着时间延长表达下降。胰岛素样生长因子-1（insulin-like growth factors-1,IGF-1）与顺铂共培养组自噬小体及LC3蛋白表达少于顺铂组,但高于对照组。结论：顺铂可能通过抑制PI3K/AKT/mTOR信号通路,从而诱导子宫内膜癌细胞发生自噬。     

苹果多酚通过激活AMPK/SIRT1信号通路对LPS诱导的肺上皮细胞自噬反应的影响

目的:探讨苹果多酚通过调节腺苷酸活化蛋白激酶/沉默信息调节因子1（AMP-activated protein kinase/Sirtuin1,AMPK/SIRT1)信号通路对脂多糖（lipopolysaccharide,LPS）诱导的人肺泡上皮细胞（A549）自噬反应的影响。方法:使用不同浓度的苹果多酚提取物（apple polyphenol extract,APE）预处理A549细胞2 h后,LPS诱导A549细胞培养24 h,MTT法检测增殖活性,筛选APE最佳预处理浓度;将A549细胞分为对照组、LPS组（3 mg/L LPS）、LPS+APE组（3 mg/L LPS+20 μg/mL APE）、APE+Compound C组（3 mg/L LPS+20 μg/mL APE+50 μmol/L Compound C）,免疫荧光染色观察A549细胞自噬;流式细胞术检测A549细胞凋亡;Western blot法检测细胞中自噬相关蛋白及AMPK/SIRT1通路相关蛋白表达水平。结果:与对照组比较,经LPS诱导的A549细胞增殖活性、自噬水平、LC3Ⅱ/LC3Ⅰ、Beclin-1、SIRT1、p-ULK1/ULK1、p-AMPK/AMPK蛋白表达降低,p62蛋白表达及细胞凋亡率升高（P＜0.05）;与LPS组比较,LPS+APE组细胞增殖活性、自噬水平、LC3Ⅱ/LC3Ⅰ、Beclin-1、SIRT1、p-ULK1/ULK1、p-AMPK/AMPK蛋白表达水平显著升高,p62蛋白表达及细胞凋亡率显著降低（P＜0.05）;与LPS+APE组比较,APE+Compound C组A549细胞增殖活性、自噬水平、LC3Ⅱ/LC3Ⅰ、Beclin-1、SIRT1、p-ULK1/ULK1、p-AMPK/AMPK蛋白表达水平显著降低,p62蛋白表达及细胞凋亡率显著升高（P＜0.05）。结论:苹果多酚通过激活AMPK/SIRT1 信号通路提高LPS诱导的肺上皮细胞自噬,降低细胞凋亡。     

L-精氨酸抑制人肺腺癌A549细胞增殖及对PI3K/Akt信号通路的影响北大核心CSCD

目的探讨L-精氨酸(L-Arginine,L-Arg)对人肺腺癌A549细胞增殖、凋亡的影响及其分子机制。方法不同浓度L-Arg(16、32、64、96、128 mmol/L)、不同时间(24、36、48 h)条件下处理A549细胞,MTT检测细胞增殖,显微镜观察细胞形态变化,流式细胞仪检测细胞凋亡率及细胞周期进程,Western blot检测PI3K/Akt(phosphatidylinositol-3-kinases/Akt)信号通路活化状态。结果(1)L-Arg能显著抑制A549细胞增殖,其效果与浓度及时间有关(P<0.05);(2)显微镜结果显示,与对照组比较,随着L-Arg浓度的增高,细胞数目降低,细胞形态变得不规则;(3)高浓度L-Arg在48 h促进细胞凋亡作用最强,阻滞细胞周期在G_0/G_1期最明显(P<0.05);(4)L-Arg浓度越高,p-Akt S473磷酸化越低(P<0.05),凋亡蛋白Cleaved Caspase-3和Bad表达越强(P<0.05)。结论 L-Arg可抑制A549细胞增殖,诱导凋亡,其机制与PI3K/Akt信号通路激活受限、上调Cleaved Caspase-3、Bad蛋白表达有关。     

自噬对宫颈癌细胞增殖和迁移能力的影响

目的 观察自噬对宫颈癌细胞增殖迁移能力的影响,并探讨其可能机制。方法 采用不同浓度雷帕霉素诱导人宫颈癌HeLa细胞,吖啶橙染色观察自噬小体的形成,Western blot检测自噬相关基因LC3B以及PI3K/Akt/mTOR通路蛋白的表达情况,采用RTCA仪器实时检测细胞的增殖能力,Transwell小室检测细胞的迁移能力。应用自噬抑制剂3-methyladenine(3-MA)阻断宫颈癌细胞自噬后,采用RTCA仪器实时检测细胞的增殖能力,Transwell小室检测细胞的迁移能力。构建带有绿色荧光蛋白的LC3B质粒,转入HeLa细胞,通过G418药物筛选转染阳性细胞,荧光显微镜观察LC3B的细胞定位,Western blot检测LC3B表达。RTCA仪器实时检测野生型和LC3B过表达HeLa细胞的增殖能力,Western blot检测PI3K/Akt/mTOR通路蛋白的表达。结果 雷帕霉素诱导后,宫颈癌HeLa细胞自噬水平增高,增殖和迁移能力有所下降;PI3K/Akt/mTOR通路蛋白表达改变(P＜0.05)。自噬抑制剂3-MA诱导HeLa细胞增殖和迁移水平下降(P＜0.05)。荧光显微镜和Western blot结果显示构建的LC3质粒成功转入Hela细胞中并且能够抑制宫颈癌细胞的增殖(P＜0.05)。结论 在一定范围内,随着自噬水平的升高,HeLa细胞增殖和迁移能力降低,可能是通过PI3K/Akt/mTOR信号通路发挥作用。通过基因靶向扰乱自噬关键基因(如LC3等)而改变宫颈癌细胞自噬水平可能为宫颈癌的治疗带来新策略。     

Tiam1蛋白表达介导PI3K/Akt/mTOR信号通路对老年胰腺癌细胞转移、侵袭的影响

目的 探讨T淋巴瘤侵袭转移诱导基因(Tiam1)蛋白表达介导PI3K/Akt/mTOR信号通路对老年胰腺癌细胞转移、侵袭的影响。方法 选择行手术确诊的老年胰腺癌患者106例，收集其癌组织标本及配对癌旁正常组织，Western Blot法检测胰腺组织Tiam1蛋白表达；选择人胰腺癌细胞株SW1990,采用浓度为50 ng/mL的HGF溶液和生理盐水处理并作为HGF组和空白组，转染Tiam1 minic作为Tiam1组，CCK8法、Transwell小室侵袭实验、划痕实验检测转染后胰腺癌细胞增殖、侵袭和转移能力；Western Blot法检测胰腺组织PI3K/Akt/mTOR相关蛋白表达，明确Tiam1蛋白表达与PI3K/Akt/mTOR信号通路的关系。结果 胰腺癌组织中Tiam1表达量高于癌旁组织中Tiam1表达量(P<0.05)。各组在转染0 h、12 h时细胞增殖率比较无明显差异(P>0.05),转染24 h、48 h、60 h时，与空白组比较，Tiam1组和HGF组细胞增殖率升高，且Tiam1组高于HGF组(P<0.05);与空白组比较，Tiam1组和HGF组侵袭...     

Plumbagin induces apoptotic and autophagic cell death through inhibition of the PI3K/Akt/mTOR pathway in human non-small cell lung cancer cells

Plumbagin (PLB) has shown anti-cancer activity but the mechanism is unclear. This study has found that PLB has a potent pro-apoptotic and pro-autophagic effect on A549 and H23 cells. PLB arrests cells in G2/M phase, and increases the intracellular level of reactive oxygen species in both cell lines. PLB dose-dependently induces autophagy through inhibition of PI3K/Akt/mTOR pathway as indicated by reduced phosphorylation of Akt and mTOR. Inhibition or induction of autophagy enhances PLB-induced apoptosis. There is crosstalk between PLB-induced apoptosis and autophagy. These findings indicate that PLB initiates both apoptosis and autophagy in NSCLC cells through coordinated pathways.     

XPA serves as an autophagy and apoptosis inducer by suppressing hepatocellular carcinoma in a PI3K/Akt/mTOR dependent manner

BackgroundTo explore the potential biological function of XPA (Xeroderma pigmentosum group A) in hepatic neoplasms and the underlying molecular mechanisms.MethodsLiver cells were used as experimental models to establish HCC (hepatocellular carcinoma) in vitro. Protein extractions were subjected to Western blotting to detect the proteins expression. The lentivirus transfection efficiency was confirmed by Western blot and RT-qPCR, Tunnel staining was used to detect apoptosis, and Transwell assays were used to observe cell migration and invasion. Cell proliferation was detected with colony formation and CCK-8 (cell counting kit-8) assays.ResultsXPA expression was obviously lower in HCC tissue and liver cancer cell lines. XPA overexpression induced autophagy and apoptosis by increasing LC3B II/I, Beclin1, cleaved-caspase-3, and Bax expression and decreasing p62 and Bcl2 protein levels. XPA also suppressed HCC EMT (Epithelial-Mesenchymal Transition) by increasing E-cadherin and decreasing N-cadherin and vimentin protein expression. Cell proliferation, migration and invasion in vivo were significantly inhibited by the overexpression of XPA, and p-PI3K, p-Akt, and p-mTOR expression were decreased in LV-XPA cells. In general, XPA inhibited HCC by inducing autophagy and apoptosis and by modulating the expression of PI3K/Akt/mTOR proteins.ConclusionsXPA overexpression was found to suppress HCC by inducing autophagy and apoptosis and repressing EMT and proliferation. Each of these effects may be involved in modulating the PI3K/Akt/mTOR signaling pathway.     

Radix Tetrastigma Extracts Enhance the Chemosensitivity in Triple-Negative Breast Cancer Via Inhibiting PI3K/Akt/mTOR-Mediated Autophagy

ObjectiveDrug resistance in tumors is one of the major factors that leads to chemotherapy failure. This study aims to investigate the effect of Radix Tetrastigma extracts (RTEs) on Taxol-induced autophagy and the chemosensitivity against drug resistance in triple-negative breast cancer (TNBC).MethodsTaxol-resistant MDA-MB-468 (MDA-MB-468/Taxol) cells were induced and treated with RTEs and/or Taxol. Mice were subcutaneously inoculated with MDA-MB- 468/Taxol cells to establish xenograft models. The associated protein levels were measured by western blotting. Flow cytometry, CCK-8 and EdU assay were performed to detect cell apoptosis, viability, and proliferation, respectively.ResultsIn MDA-MB-468/Taxol cells, RTEs & Taxol treatment increased cell apoptosis, reduced cell viability and proliferation, up-regulated anti-autophagy marker LC3I/LC3II ratio, and enhanced mTOR level. With RTEs & Taxol treatment, mTOR silencing downregulated LC3I/LC3II ratio, increased cell viability and proliferation, and reduced cell apoptosis, while mTOR overexpression showed the opposite results. PI3K inhibitor reduced AKT and mTOR levels, and the effects on cell activities were similar to the results of mTOR silencing. After RTEs & Taxol injection, xenograft tumor was smaller, and AKT, mTOR, LC3I/LC3II ratio and apoptotic marker cleaved caspase-3 were increased.ConclusionRTEs enhanced the chemosensitivity of resistant TNBC cells to Taxol through inhibiting PI3K/Akt/mTOR-mediated autophagy.MicroRTEs exerted anti-tumor effects in various cancers, and this study determined its role in TNBC. Taxol-resistant MDA-MB-468 cells were induced and xenograft models were established. We found that RTEs inhibited autophagy of MDA-MB-468/Taxol cells and reduced tumor growth. Inhibition of PI3K/Akt/mTOR pathway promoted autophagy of MDA-MB-468/Taxol cells. We may provide a new potential strategy for TNBC treatment.     

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.     

防己诺林碱对肺癌H1299和A549细胞的作用及其分子机制研究

目的 探究防己诺林碱在肺癌中的作用及其分子机制。方法 MTS法检测经10、15、20、30、40和60 μM/L防己诺林碱处理的肺癌H1299和A549细胞的增殖情况,通过Caspase3、Caspase8和Caspase9活性检测试剂盒和TUNEL试剂盒检测细胞凋亡情况。Western blot检测MAPK信号通路(p-Akt、PI3K、mTOR和Akt蛋白)、增殖和转移(MMP-2、MMP-9、PCNA、Cyclin D1和P21蛋白)、周期和凋亡(Cyclin D2、Bcl2、MCL-1、Bax和p53蛋白)相关蛋白的表达情况,通过Real-time PCR检测PI3k、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2、MCL-1、Bax、Bcl2和TP53基因表达情况。结果 防己诺林碱会抑制肺癌H1299和A549细胞的增殖,诱导细胞凋亡,增加Caspase3、Caspase8和Caspase9酶活性。经防己诺林碱处理后,PI3K、p-Akt、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2和Bcl2蛋白表达降低,P21、MCL-1、Bax和p53蛋白表达升高,并且表现为剂量依赖性,但对Akt蛋白表达无影响;PI3K、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2和Bcl2基因表达降低,TP53、MCL-1和Bax基因表达增加。结论 防己诺林碱通过调控MAPK信号通路、增殖和转移、周期和凋亡相关蛋白和基因的表达,从而抑制细胞增殖,诱导细胞凋亡。     

PI3K/Akt/mTOR通路抑制剂对白血病细胞株增殖及其PHLPP表达的影响

目的:观察PI3K/Akt/mTOR通路抑制剂wortmannin或rapamycin对白血病细胞株增殖及其PHLPP(PH domainleucine-rich repeat protein phosphatase)蛋白表达的影响。方法:以不同浓度的wortmannin或rapamycin分别作用于人类髓细胞白血病细胞系K562、HL-60,采用WST-1法检测细胞的增殖活性,AnnexinⅤ-FITC双染流式细胞术检测细胞凋亡,Westernblotting法检测细胞中p-Akt、Akt、PHLPP蛋白的表达。结果:Wortmannin以时间以及剂量依赖方式抑制K562、HL-60细胞的增殖(P<0.05),48 h的IC50值分别为(187.6±48.4)、(185.5±48.1)nmol/L。100 nmol/L wortmannin作用于K562细胞、50nmol/L wortmannin作用于HL-60细胞12和24 h后,细胞凋亡率均较对照细胞显著升高[(12.4±0.7)%、(17.6±2.3)%vs(5.0±0.6)%,P<0.05;(11.0±0.2)%、(17.9±1.6)%vs(6.8±0.4)%,P<0.05]。Wortmannin分别作用于K562、HL-60细胞12、24、36 h后,p-Akt、PHLPP的蛋白表达水平明显降低;rapamycin同样可使K562、HL-60细胞中PHLPP蛋白的表达水平降低。结论:PI3K/Akt/mTOR信号通路抑制剂抑制白血病细胞株增殖的同时降低其PHLPP蛋白的表达。     

白藜芦醇联合γ射线调控PI3K/Akt/mTOR信号通路对宫颈癌Hela细胞的影响

目的 探讨白藜芦醇联合γ射线对宫颈癌Hela细胞生物学行为的影响,并对其可能机制进行初步探究。方法 CCK-8法检测不同浓度白藜芦醇溶液 ±γ射线照射后细胞群体增殖;划痕实验和Transwell小室实验检测细胞迁移和侵袭;流式细胞术和Annexin V-FITC/PI双染检测细胞凋亡;蛋白印迹法检测PI3K、Akt、p-Akt、mTOR、p-mTOR蛋白表达。结果 与对照组相比,白藜芦醇组 ±γ射线照射均能抑制细胞增殖、迁移、侵袭能力,并促进细胞凋亡,且联合的效果更加明显。与对照组相比,白藜芦醇和γ射线均能降低细胞中Bcl-2、PI3K、p-Akt、p-mTOR蛋白表达,使Bax蛋白表达上调,但Akt、mTOR蛋白未发生明显改变。结论 白藜芦醇联合γ射线能够明显抑制Hela细胞增殖、迁移、侵袭能力并促进细胞凋亡,其机制可能与PI3K/Akt/mTOR信号通路的抑制作用及下游相关蛋白的表达相关。