Hsa-miR-4282对肝癌细胞系SMMC-7721生长的影响

目的  探讨Hsa-miR-4282在肝癌细胞系SMMC-7721中的表达及其对细胞生长的影响。方法 采用实时荧光定量PCR法检测Hsa-miR-4282在人正常肝上皮细胞系HL-7702和人肝癌细胞系MHCC97-H、SMMC-7721，以及 20例肝癌组织及其相应癌旁组织中的表达。采用瞬时转染法将Hsa-miR-4282 mimics（上调组）和Hsa-miR-4282 inhibitor（下调组）分别转染肝癌SMMC-7721细胞，上调组和下调组分别设置相应阴性对照组。转染后采用MTT法检测细胞增殖能力，平板克隆形成实验检测细胞克隆形成能力，流式细胞仪检测细胞凋亡能力。结果 Hsa-miR-4282在肝癌组织、肝癌细胞MHCC97-H及肝癌细胞SMMC-7721中的表达均低于癌旁组织及正常肝细胞HL-7702（P＜0.05）。MTT实验结果显示，Hsa-miR-4282上调后肝癌SMMC-7721细胞的OD值低于其阴性对照组，而下调后OD值高于其阴性对照组 （P＜0.05）。平板克隆形成实验显示，下调组的细胞克隆数高于其阴性对照组［（240±7） 个 vs （191±10） 个，P=0.005）］，而上调组细胞克隆数低于基阴性对照组［（146±10） 个 vs （193±12） 个，P=0.013）］。流式细胞仪检测结果显示，Hsa-miR-4282上调组细胞凋亡率较其阴性对照组升高［（23.89±1.89）% vs（16.6±1.14）%，P=0.009）］，下调组细胞凋亡率较期阴性对照组降低［（14.98±0.46）% vs （17.79±0.73）%，P=0.010］。结论 Hsa-miR-4282上调可抑制肝癌SMMC-7721细胞增殖，促进细胞凋亡，可能与肝癌的发病机制有关。     

Inhibitory effect of emodin on human hepatoma cell line SMMC-7721 and its mechanism

BackgroundDa Huang (Radix et Rhizoma Rhei) is the dried root or rhizome of Rheum palmatum L., Rheum tanguticum Maxim ex Balf. or Rheum officinale Braill of family Polygonaceae. It has heat clearing, damp drying, fire purging and toxin removing effects. Because of its definite curative efficacy, it has been widely applied in clinical settings.ObjectiveTo study the inhibitory effect of emodin on human hepatoma cell line SMMC-7721 and its mechanism.MethodsMTT assay, flow cytometry and electron microscopy were used to investigate the inhibitory effect of different concentrations of emodin on human hepatoma cell line SMMC-7721.Results12 h, 24 h and 48 h after the action of 20, 40 and 80 umol/L emodin on SMMC-7721 cells, the proliferation of human hepatoma SMMC-7721 cells was inhibited; the inhibitory effects showed time-and concentration-dependence. 48 h after the action of different concentrations of emodin on SMMC-7721 cells, cells in G2/M phase increased significantly, while the proportion of S phase cells gradually declined.ConclusionEmodin can inhibit human hepatoma cell line SMMC-7721.     

Nutlin-3-induced redistribution of chromatin-bound IFI16 in human hepatocellular carcinoma cells in vitro is associated with p53 activation

Aim:

Interferon-γ inducible protein 16 (IFI16), a DNA sensor for DNA double-strand break (DSB), is expressed in most human hepatocellular carcinoma cell (HCC) lines. In this study we investigated the re-localization of chromatin-bound IFI16 by Nutlin-3, a DNA damage agent, in HCC cells in vitro, and the potential mechanisms.

Methods:

Human HCC SMMC-7721 (wild-type TP53), Huh-7 (mutant TP53), Hep3B (null TP53) and normal fetal liver L02 cell lines were examined. DSB damage in HCC cells was detected via γH2AX expression and foci formation assay. The expression of IFI16 and IFNB mRNA was measured using RT-PCR, and subcellular localization and expression of the IFI16 protein were detected using chromatin fractionation, Western blot analysis, and fluorescence microscopy.

Results:

Treatment of SMMC-7721 cells with Nutlin-3 (10 μmol/L) or etoposide (40 μmol/L) induced significant DSB damage. In SMMC-7721 cells, Nutlin-3 significantly increased the expression levels of IFI16 and IFNB mRNA, and partially redistributed chromatin-bound IFI16 protein to the cytoplasm. These effects were blocked by pretreatment with pifithrin-α, a p53 inhibitor. Furthermore, Nutlin-3 did not induce ectopic expression of IFI16 protein in Huh-7 and Hep3B cells. Moreover, the association of IFI16 with chromatin and Nutlin-3-induced changes in localization were not detected in L02 cells.

Conclusion:

Nutlin-3 regulates the subcellular localization of IFI16 in HCC cells in vitro in a p53-dependent manner.     

Mild cognitive impairment in Parkinson’s disease is associated with decreased P300 amplitude and reduced putamen volume

ObjectiveFunctional and structural brain alterations of cognitively normal Parkinson’s disease (PD-CN) and Parkinson’s disease mild cognitive impairment (PD-MCI) patients were investigated using event-related potentials (ERP) P300 and volumetric magnetic resonance imaging (MRI) parameters.MethodsTwenty three patients with PD-CN, 21 with PD-MCI, and 23 demographically-matched healthy controls were included. EEGs were recorded using a visual oddball task and mean amplitude and peak latency values of P300 were measured. Gray matter volumes (GMV) of thalamus, caudate, putamen, globus pallidus, hippocampus, amygdala and nucleus accumbens were obtained using FMRIB Integrated Registration and Segmentation Tool. Correlations among P300, subcortical GMV and cognitive performances were assessed.ResultsPD-CN patients demonstrated reduced P300 amplitudes compared to healthy controls. PD-MCI patients had lower P300 amplitudes than both PD-CN patients and controls and reduced volumes of the putamen compared to controls. Both putamen volumes and P300 amplitudes showed moderate associations with executive functions.ConclusionsOur findings support that P300 amplitude may be a useful marker for the detection of preclinical changes before the appearance of cognitive and structural deterioration in PD, as shown by decreased frontal P300 amplitudes in PD-CN. The reduction further spread to centro-parietal areas in PD-MCI patients, which was accompanied by lower putamen volumes.SignificanceThis study is the first to report on changes in ERP P300 amplitude and subcortical volume in well-matched samples of PD-CN, PD-MCI and healthy controls.     

过表达PRRX1 通过p53 介导的线粒体凋亡途径诱导肝癌SMMC7721 细胞凋亡

[摘要] 目的：探讨配对相关同源框1 蛋白（PRRX1）过表达对肝癌SMMC7721 细胞凋亡的影响及其分子机制。方法：分别用慢病毒介导PRRX1 过表达载体（pGMLV-PRRX1）、空载质粒（Vector）感染人肝癌SMMC7721 细胞，用qPCR和WB实验检测慢病毒感染后细胞中PRRX1 mRNA和蛋白的表达变化，用CCK-8 法、Annexin-V FITC/PI 染色流式细胞术分别检测PRRX1 过表达对SMMC7721 细胞增殖、凋亡的影响，用线粒体膜电位检测试剂盒（JC-10 染色法）检测细胞线粒体膜电位变化，用caspase 活性检测试剂盒（分光光度法）测定细胞中caspase-8 和caspase-9 酶活性，用WB实验检测细胞中p53、Bcl-2、Bax、Fas、Cleaved-caspase-3以及线粒体和细胞质中细胞色素C（Cty C）蛋白的表达。结果：成功构建PRRX1 过表达的SMMC7721 细胞株，感染细胞中PRRX1 mRNA和蛋白的表达水平显著升高（均P<0.01）。与对照组和空载组比较，PRRX1 过表达组SMMC7721 细胞的增殖能力显著下降、细胞凋亡率显著增高、Cleaved-caspase-3 剪切水平显著升高、线粒体膜电位显著下降、线粒体中Cty C蛋白表达下调、胞质中Cty C蛋白表达上调以及caspase-9 酶活性升高（P<0.05 或P<0.01），同时p53 和Bax 蛋白表达增加而Bcl-2 蛋白表达降低（均P<0.05），但Fas 蛋白表达及caspase-8 酶活性无显著变化（均P>0.05）。结论: PRRX1 过表达可诱导肝癌SMMC7721 细胞凋亡，其机制可能与p53介导的线粒体凋亡途径被激活有关。     

蛇床子素诱导内质网应激抑制SMMC7721人肝癌细胞增殖的机制研究＊

目的 研究蛇床子素抑制肝癌细胞增殖的机制。方法 采用20 - 100 μM蛇床子素干预SMMC7721人肝癌细胞24 h、48 h和72 h，运用MTT方法检测细胞增殖；采用20 - 80 μM蛇床子素干预SMMC7721肝癌细胞24 h，运用流式细胞术检测细胞凋亡及Western blot检测Bax和Bcl-2蛋白表达；采用 60 μM蛇床子素干预SMMC7721肝癌细胞48 h，运用流式细胞术检测细胞周期，以实时荧光定量PCR技术检测GRP78、DDIT3、GADD34、ATF4、EIF2A、GDF15、CDKN1B、FOXO3、RICTOR、SGK1基因表达，Western blot方法检测CyclinD1、CyclinE1、p27^Kip1和CDK4细胞周期蛋白及GRP78、GRP94、PERK、XBP-1s、CHOP、p-eIF2α(Ser51)内质网应激蛋白表达。各实验均以0.1% DMSO为对照组，并以0.1 μM毒胡萝卜素为内质网应激诱导剂组。结果 与对照组比较，100 μM蛇床子素干预24 h显著抑制SMMC7721肝癌细胞增殖，其抑制率为36.76%（P < 0.05）；60 - 100 μM蛇床子素干预48 h后显著抑制SMMC7721肝癌细胞增殖，抑制率为30.84%-52.49%（P < 0.05）；40 - 100 μM蛇床子素干预72 h后显著抑制SMMC7721肝癌细胞增殖，抑制率为32.7%-73.15%（P < 0.05）。大于60 μM蛇床子素可诱导SMMC7721肝癌细胞晚期凋亡且显著抑制促凋亡蛋白Bax表达（P < 0.05）。60 μM蛇床子素干预SMMC7721肝癌细胞48 h后，G1期细胞数增加、G2期和S期减少，且CyclinD1、CyclinE1和p27^Kip1蛋白表达显著被抑制（P < 0.05）。20 - 80 μM蛇床子素处理SMMC7721肝癌细胞24 h后，均显著促进GRP78、DDIT3（CHOP）、ATF4、FOXO3、RICTOR和SGK1基因表达（P < 0.05）； 20 μM蛇床子素显著促进GADD34和EIF2A基因表达（P < 0.05）；80 μM蛇床子素显著促进GDF15基因表达（P < 0.05），且CHOP、XBP-1s蛋白表达显著增强。结论 蛇床子素通过诱导内质网应激反应以抑制SMMC7721肝癌细胞增殖，从而发挥抗肝癌活性。     

Holotransferrin enhances selective anticancer activity of artemisinin against human hepatocellular carcinoma cells

Artemisinin, also termed qinghaosu, is extracted from the traditional Chinese medicine ar- temesia annua L. （the blue-green herb） in the early 1970s, which has been confirmed for effectively treating malaria, Additionally, emerging data prove that artemisinin exhibits anti-cancer effects against many types of cancers such as leukemia, melanoma, etc. Artemisinin becomes cytotoxic in the presence of ferrous iron. Since iron influx is high in cancer cells, artemisinin and its analogs selectively kill can- cer cells with increased intracellular iron concentrations. This study is aimed to investigate the selective inhibitory effects of artemisinin on SMMC-7721 cells in vitro and determine the effect of holotransfer- fin, which increases the concentration of ferrous iron in cancer cells, combined with artemisinin on the anticancer activity. MTT assay was used for assessing the proliferation of SMMC-7721 cells treated with artemisinin. The induction of apoptosis and inhibition of colony formation in SMMC-7721 cells treated with artemisinin were determined by TdT-mediated dUTP nick end labeling （TUNEL） and col- ony formation assay, respectively. The results showed that artemisinin at various concentrations signifi- cantly inhibited growth, colony formation and cell viability of SMMC-7721 cells （P〈0.05）, likely due to induction of apoptosis of SMMC-7721 cells. Of interest, it was found that incubation of artemisinin combined with holotransferrin sensitized the growth inhibitory effect of artemisinin on SMMC-7721 cells （P〈0.01）. Our data suggest that treatment with artemisinin leads to inhibition of viability and pro- liferation, and apoptosis of SMMC-7721 ceils. Furthermore, we observed that holotransferrin signifi- cantly enhanced the anti-cancer activity of artemisinin. This study may provide a potential therapeutic choice for liver cancer.     

消癌解毒方诱导人肝癌SMMC-7721细胞miRNA表达变化

目的:探讨消癌解毒方对人肝癌SMMC-7721细胞增殖及微小核糖核酸(microRNA,miR)-25-3p,miR-29a-5p,miR-122-3p,miR-124-3p,miR-182-5p表达谱的影响。方法:将12只雄性大耳白兔随机分为4组,分别为消癌解毒方高、中、低剂量(15.12,7.56,3.78 g·kg-1)组和空白组,各组分别给予消癌解毒方及生理盐水灌胃4 d。4 d后于颈动脉中取血清并配制培养基。用消癌解毒方(15.12,7.56,3.78 g·kg-1)含药血清及空白血清的培养基处理人肝癌细胞株SMMC-7721,噻唑蓝(MTT)比色法检测肿瘤细胞增殖活性、实时荧光定量逆转录聚合酶链式反应(Real-time polymerase chain reaction,Real-time PCR)法验证人肝癌细胞SMMC-7721中miR-25-3p,miR-29a-5p,miR-122-3p,miR-124-3p和miR-182-5p的表达水平。结果:经过12,24,48 h后,消癌解毒方(15.12,7.56,3.78 g·kg-1)含药血清对人肝癌SMMC-7721细胞的增殖均存在抑制作用。随着消癌解毒方含药血清浓度的增加,其对人肝癌细胞SMMC-7721细胞增殖的抑制率也相应增加。其中高剂量组含药血清的抑制效果最好,其干预12,48 h的吸光度A较同期空白组明显降低(P0.05)。高剂量组干预24 h A比同期空白组显著降低(P0.01),该组抑制率为42.86%。Real-time PCR证实消癌解毒方(15.12,7.56,3.78 g·kg-1)含药血清的培养基能诱导miR-25-3p,miR-182-5p表达下调,诱导miR-29a-5p,miR-122-3p,miR-124-3p表达上调。且高剂量组的调控作用较空白组更显著(P0.01)。结论:消癌解毒方可能通过诱导miRNA表达谱的改变而参与抑制人肝癌细胞SMMC-7721增殖作用,但其具体机制仍有待进一步研究。     

辣椒碱对肝癌SMMC-7721细胞迁移和侵袭的影响及机制

目的:观察辣椒碱(capsaicin)对肝癌SMMC-7721细胞迁移和侵袭的影响及可能的分子机制。方法:设立不同浓度辣椒碱组以及空白组,采用细胞计数试剂盒-8法(CCK-8)检测辣椒碱(0,25,50,75,100,150,200,250μmol·L-1)处理肝癌SMMC-7721细胞24 h后的细胞活性;穿透小室(transwell)检测辣椒碱(0,50,75,100μmol·L-1)的肝癌SMMC-7721细胞迁移和侵袭能力;蛋白质免疫印迹法(Western blot)检测辣椒碱(0,50,75,100μmol·L-1)处理肝癌SMMC-7721细胞24 h后,对细胞中的E-钙黏蛋白(E-cadherin),波形蛋白(Vimentin),基质金属蛋白酶-2(matrix metalloproteinase-2,MMP-2)和(matrix metalloproteinase-9,MMP-9)蛋白表达水平的影响。结果:与空白组比较,辣椒碱(25,50,75,100μmol·L-1)作用24 h后均对细胞存活率未产生明显影响,从150μmol·L-1开始,随着辣椒碱浓度逐渐升高,细胞存活率逐渐下降(P0.01),且呈剂量依赖效应;与空白组比较,辣椒碱(50,75,100μmol·L-1)干预能显著抑制肝癌SMMC-7721细胞迁移和侵袭,且呈浓度依赖效应(P0.01);与空白组比较,辣椒碱(50,75,100μmol·L-1)干预能明显上调肝癌SMMC-7721细胞中E-cadherin蛋白表达水平(P0.01),下调Vimentin,MMP-2,MMP-9蛋白的表达水平(P0.01)。结论:辣椒碱干预对肝癌SMMC-7721细胞迁移和侵袭具有抑制作用,可能与其上调肝癌SMMC-7721细胞中E-cadherin蛋白的表达,下调肝癌SMMC-7721细胞中Vimentin,MMP-2和MMP-9蛋白的表达有关。     

双萘酰亚胺类化合物诱导SMMC-7721细胞凋亡的研究

目的 观察双萘酰亚胺类化合物(C8)对人肝癌细胞株SMMC-7721细胞的作用. 方法 四甲基偶氮唑盐法检测C8对SMMC 7721细胞的抑制情况;流式细胞术检测细胞周期和凋亡率;Western blot检测Bcl 2蛋白表达量;流式细胞术分析细胞内Bcl 2蛋白量;酶联免疫法检测Caspase9和Caspase 3表达量. 结果 C8抑制SMMC 7721细胞增殖,半数抑制浓度为15 umol/L.C8作用浓度在10,15、20 umol/L时,SMMC 7721细胞的凋亡比例分别为16.8%、29.4%和35.8%,对照组为2.1%,SMMC 7721细胞的凋亡率明显高于对照组,P<0.01.细胞内Bcl-2蛋白表达水平下降.酶联免疫检测结果表明Caspase 9和Caspase 3被活化.结论 C8可诱导人肝癌SMMC 7721细胞的凋亡,为抗肿瘤药物的研究提供新的化合物.