siRNA沉默NHE1基因对MHCC97-H肝癌细胞侵袭迁移的影响

目的:探讨RNA干扰沉默NHE1基因后对人肝癌细胞株MHCC97-H细胞侵袭迁移的影响,方法:应用NHE1基因小干扰RNA(smallinterfering RNA,siRNA)转染人肝癌细胞株MHCC97-H细胞,同时设立空白对照组和无关对照组.转染成功后采用RT-PCR和Western blot分别从基因和蛋白水平...     

RNAi抑制人大肠癌LOVO细胞Bmi-1基因的表达

目的探讨RNA干扰（RNAi）技术沉默Bmi-1基因表达对人大肠癌细胞株LOVO增殖和侵袭力的影响及机制。方法将化学法合成的针对Bmi-1mRNA不同位点设计的3对siRNA序列（siR-NA1～3）和1对带有荧光标记的FAM-siRNA（siRNA4）转染至人大肠癌LOVO细胞,荧光显微镜下观察siRNA的转染效率,QRT-PCR检测Bmi-1mRNA表达抑制作用,Western Blot检测Bmi-1蛋白表达变化,MTT法检测LOVO细胞体外增殖变化,小室侵袭实验检测LOVO细胞侵袭能力。结果利用荧光标记的Oligo观察到siRNA转染效率达70%。siRNA1对mRNA表达抑制率最高,从而筛选出沉默效应最强的siRNA序列为siRNA1。siRNA1转染组LOVO细胞Bmi-1蛋白表达,增殖及侵袭力明显低于阴性对照组和空白对照组（P〈0.05）。结论化学合成的靶向Bmi-1siRNA转染人大肠癌LOVO细胞能有效抑制Bmi-1的mRNA和蛋白质表达水平,Bmi-1基因的RNA干扰可有效抑制人大肠癌LOVO细胞的增殖和侵袭能力。     

siRNA沉默Bmi-1表达对肺腺癌A549细胞侵袭能力的影响

目的观察Bmi-1基因沉默对A549细胞增殖和侵袭影响并初步探讨其机制。方法根据四条针对Bmi-1的小干扰RNA(siRNA)序列,将其瞬时转染到A549细胞中,选择最有效的一条链并构建到逆转录病毒真核表达载体p SUPERretro-Neo中,形成重组载体,然后将其稳定转染至A549细胞中,构建了稳定转染Bmi-1-shRNA的A549细胞。应用MTT实验检测Bmi-1-siRNA对A549细胞体外增殖的影响;Transwell小室观察其对A549侵袭能力的影响;RT-PCR和明胶酶谱法分别观察siRNA对A549细胞MMP-2/MMP-9表达及活性的影响。结果 Bmi-1 siRNA能够抑制A549细胞的增殖能力和侵袭能力,Bmi-1 siRNA能够抑制A549细胞MMP-2/MMP-9的表达和活性。结论 Bmi-1 siRNA对A549细胞侵袭能力的抑制和MMP-2/MMP-9的活性降低有关。     

TGFβ1转染hMSC对MHCC97-H影响的实验研究

目的观察经TGFβ1基因修饰的人骨髓间充质干细胞(hMSC)对高转移潜能肝癌细胞(MHCC97-H)增殖能力及侵袭能力的影响。方法构建TGFβ1慢病毒载体,eGFP为报告基因,转染hMSC。Transwell法检测hMSC与肝癌细胞共培养实验,检测MHCC97-H细胞侵袭能力的变化。CCK-8法检测与hMSC共培养前后MHCC97-H增殖能力的变化。PCR法检测转基因hMSC与MHCC97-H细胞共培养前后转移相关因子基因α-V、肿瘤生长因子TGFβ1和肿瘤凋亡因子PDCD4等基因表达。结果 MHCC97-H与hMSC细胞共培养后,MHCC97-H增殖能力增强,hMSC TGFβ1基因过表达组对MHCC97-H细胞增殖具有抑制作用。MHCC97-H与hMSC细胞共培养后,侵袭能力增强,hMSC TGFβ1基因过表达组对MHCC97-H细胞侵袭能力具有明显的抑制作用。hMSC基因转染组TGFβ1表达明显增高。hMSC基因转染共培养组MHCC97-H细胞TGFβ1基因表达明显低于对照组。hMSC基因转染共培养组MHCC97-H细胞α5基因表达降低。hMSC基因转染共培养组MHCC97-H细胞PDCD4基因表达降低。结论转基因hMSC具有抑制MHCC97-H细胞增殖、侵袭的作用。     

SRPX2对肝癌细胞侵袭与迁移能力的影响及作用机制

目的探讨sushi重复蛋白X连锁2(SRPX2)对人肝癌细胞MHCC97H侵袭与迁移能力的影响及作用机制。方法体外培养人肝癌细胞MHCC97H,用Lipofectamine法将阴性对照和SRPX2特异性siRNA转染到人肝细胞癌MHCC97H,继续培养48 h收获细胞,用Transwell检测细胞体外侵袭和迁移能力;实时荧光RT-PCR法检测人肝癌细胞MHCC97H内SRPX2和基质金属蛋白酶(MMP2)mRNA表达的影响;Western Blot法检测人肝癌细胞MHCC97H内SRPX2和MMP2蛋白水平的影响。结果与阴性对照组比较,干扰SRPX2组人肝癌细胞MHCC97H侵袭、迁移能力、SRPX2 mRNA、MMP-2 mRNA、SRPX2蛋白和MMP-2蛋白降低,差异有统计学意义(P0.05)。结论 SRPX2可能通过调节MMP2而影响人肝癌细胞MHCC97H侵袭和迁移。     

大蒜素抑制肝癌MHCC97H细胞的迁移、侵袭

目的:观察大蒜素对肝癌MHCC97H细胞株体外增殖、迁移、侵袭及对MMP-2、MMP-9、CD24 mRNA表达的影响并初步探讨其机制.方法:以肝癌MHCC97H细胞株为研究对象,MTT法、Transwell小室实验检测不同浓度大蒜素对肝癌MHCC97H细胞株迁移、侵袭能力的影响.实时定量PCR检测(realtime quantitative PCR,qRT-PCR)法检测不同浓度大蒜素对MHCC97H细胞株MMP-2、MMP-9、CD24 mRNA表达的影响.结果:MTT显示大蒜素抑制MHCC97H细胞增殖(P0.01),呈现剂量依赖性.Transwell小室实验显示大蒜素抑制MHCC97H细胞的迁移(P0.01),一定范围内呈现剂量依赖性,大蒜素组侵袭细胞较阴性对照组显著减少(P0.01).qRT-PCR检测发现不同浓度大蒜素可以下调MHCC97H细胞MMP-2、MMP-9、CD24的表达,且呈现一定程度剂量依赖性(P0.01).结论:大蒜素对肝癌MHCC97H细胞株的增殖、迁移、侵袭有抑制作用,且在一定范围内呈现出剂量依赖性.其机制可能与抑制其MMP-2、MMP-9、CD24 mRAN的表达有关.     

特异性下调LKB1的表达对肝癌细胞侵袭迁移能力的影响

目的研究特异性下调LKB1的表达对肝癌细胞系SK-hep-1迁移侵袭能力的影响。方法 Real-time PCR和Western Blot检测人肝癌细胞株和人正常肝细胞HL7702中LKB1表达情况。设计并合成LKB1特异性双链小干扰RNA(LKB1-siRNA),转染到高表达LKB1的人肝癌细胞株SK-hep-1中靶向沉默LKB1基因表达,并设置阴性对照组(NC组)。Real-time PCR和Western Blot检测LKB1基因的mRNA水平与蛋白表达水平的变化。利用CCK-8法检测肝癌细胞增殖能力。通过体外Transwell小室基质侵袭和迁移实验,观察LKB1表达沉默后对人肝癌细胞株SK-hep-1侵袭迁移能力的影响。计量资料两组间比较采用t检验,多组间比较采用单因素方差分析,进一步两两比较采用LSD-t检验。结果与正常人肝细胞HL7702相比,LKB1基因和蛋白在人肝癌细胞SK-hep-1中高表达(P值均0.05)。与NC组相比,siLKB1-1处理组SK-hep-1细胞中的LKB1基因和蛋白表达均明显降低(P值均0.05)。与NC组相比,siLKB1-1转染的SK-hep-1细胞增殖速度明显加快、侵袭和迁移能力明显增强(1.393±0.022 vs 1.128±0.032、147±19 vs 83±21、113±13 vs 75±17;t值分别为15.313、14.879、8.791;P值均0.001)。结论 LKB1有可能参与抑制肝癌增殖、侵袭迁移的过程并影响肝癌的预后。     

TRPV6对人卵巢癌细胞株HO-8910PM迁移的影响

目的探讨TRPV6对卵巢癌细胞株HO-8910PM迁移能力的影响。方法细胞株分别瞬时转染TRPV6的特异性siRNA干扰序列,然后分别通过RT-PCR和Western-blot检测HO-8910PM细胞干扰前后TRPV6基因和蛋白表达变化,通过划痕试验和Transwell小室试验检测TRPV6对HO-8910PM细胞迁移的影响。结果 RT-PCR和Western-blot证实了TRPV6在人卵巢癌高转移细胞株HO-8910PM中的表达以及TRPV6 RNA干扰序列的干扰效率;划痕试验和Transwell小室试验表明,与HO-8910PM阴性干扰对照细胞相比,HO-8910PM-TRPV6-siRNA1和siR-NA2的迁移能力均显著下降(P<0.01)。结论卵巢癌细胞HO-8910PM中TRPV6的表达水平高低与该细胞迁移能力高低呈正相关,TRPV6有可能成为卵巢癌转移预防和治疗的新靶点。     

ku80蛋白表达水平与肝癌细胞侵袭迁移能力的相关性

目的观察ku80蛋白表达水平与肝癌细胞侵袭迁移能力的相关性。方法使用肝癌细胞系MHCC97-H、 MHCC97-L、HepG2及正常人肝细胞HL-7702为研究对象,分别采用RT-PCR、Western印迹方法检测ku80 mRNA及蛋白水平;体外划痕实验、Transwell侵袭实验观察4株细胞迁移、侵袭能力;免疫荧光检测ku80亚细胞定位;线性相关分析ku80及其mRNA与肝癌细胞系迁移、侵袭能力的相关性。结果 ku80 mRNA及蛋白在4株细胞系中均有表达,且在3株肝癌细胞中的表达明显高于正常肝细胞系HL-7702(均P0.05),其中MHCC97-H细胞表达水平最高(P0.01);体外划痕实验、Transwell侵袭实验显示3株肝癌细胞系的迁移、侵袭能力明显高于HL-7702细胞系(均PO.05),其中MHCC97-H的迁移侵袭能力最强(P0.01)。ku80蛋白定位于细胞核。线性相关性分析显示ku80蛋白及mRNA的表达水平与肝癌细胞系的迁移、侵袭能力呈正相关。结论 ku80蛋白主要在细胞核表达,其表达水平与肝癌细胞系的迁移、侵袭能力呈正相关。     

高低转移潜能肝癌细胞OPN、TGFβ1基因沉默位点的筛选

目的通过对高低转移潜能肝癌细胞进行骨桥蛋白(osteopontin,OPN)和转移生长因子β1(transforming growth factorβ1,TGFβ1)基因沉默的位点进行筛选,筛选最佳基因沉默位点。方法 q PCR检测MHCC97-H和MHCC97-L细胞两种因子表达差异情况,对MHCC97-H TGFβ1和MHCC97-L OPN高表达组进行基因沉默,每组确定3个基因位点进行沉默,Western blotting法分析各组OPN和TGFβ1表达。q PCR定量分析各组沉默效果。结果 q PCR检测显示:与MHCC97-L细胞比较,MHCC97-H细胞中TGFβ1表达量更高,与MHCC97-H细胞比较,MHCC97-L细胞中OPN的表达量更高(P0.05)。q PCR定量分析3个位点沉默效果显示MHCC97-L OPN siRNA 226、MHCC97-H TGFβ1 siRNA 1382沉默效果较好(P0.05)。MHCC97-L OPN不同位点沉默效果电泳图结果显示所有沉默组MHCC97-L细胞中OPN蛋白已降到非常低水平,而MHCC97-H TGFβ1不同位点沉默效果电泳图结果显示TGFβ1沉默效果1382位点明显。结论不同的基因位点沉默效果存在差异,MHCC97-L OPN siRNA 226和MHCC97-H TGFβ1 siRNA 1382位点沉默效果最佳。通过确定最佳沉默效能的基因位点,可以达到基因最佳沉默效能为后续实验提供研究基础。     

Establishment of cell clones with different metastatic potential from the metastatic hepatocellular carcinoma cell line MHCC97

AIM To establish clone cells with different metastaticpotential for the study of metastesis-related mechanisms.METHODS Cloning procedure was performed on parentalhepetocellular carcinoma (HCC) cell line MHCC97,andbiological characteristics of the target clones selected byin vivo screening were studied.RESULTS Two clones with high (MHCC97-H) and low(MHCC97-L) metastatic potential were isolated from theparent cell line.Compared with MHCC97-L,MHCC97-H hadsmaller cell size (average cell diameter 43μm vs 50 μm)and faster in vitro and in vivo growth rate (tumor celldoubling time was 34.2 h vs 60.0 h).The main ranges ofchromosomes were 55-58 in MHCC97-H and 57-62 inMHCC97-L.Boyden chamber in vitro invasion assaydemonstrated that the number of penetrating cells throughthe artificial basement membrane was (37.5±11.0) cells/field for MHCC97-H vs (17.7±6.3)/field for MHCC97-L.The proportions of cells In G0-G1 phase,S phase,andG2-M phase for MHCC97-H/MHCC97-L were 0.56/0.65,0.28/0.25 and 0.16/0.10,respectively,as measured byflow cytometry.The serum AFP levels in nude mice 5 wkafter orthotoplc implantation of tumor tissue were (246±66)μg.L~(-1) for MHCC97-H and (91±66)μg.L~(-1) for MHCC97-L.The pulmonary metastatic rate was 100% (10/10) vs40% (4/10).CONCLUSION Two clones of the same geneticbackground but with different biological behaviors wereestablished,which could be valuable models forInvestigation on HCC metastasis.     

膜-细胞骨架联接分子ezrin对肝癌细胞系生长和侵袭能力的影响

目的探讨膜-细胞骨架联接蛋白ezrin在肝细胞肝癌生长和转移过程中的作用。方法分别应用免疫荧光、逆转录聚合酶链反应（RT—PCR）和Western blot检测ezrin和骨架蛋白在不同转移潜能肝癌细胞系中的表达。选取高转移潜能SF7721（SMMC-7721经转基因后稳定表达肝细胞生长因子，从而获得高转移潜能的细胞系）和MHCC97-H细胞系为研究对象。通过RNA干扰技术下调SF7721和MHCC97-H细胞系中ezrin蛋白的表达，观察其运动和侵袭能力的变化：通过四甲基偶氮唑盐检测细胞增殖能力变化；电子显微镜观察细胞伪足；Transwell检测细胞的运动侵袭能力。结果免疫荧光显示ezrin和骨架蛋白表达于细胞质，且双色荧光证实两者存在共表达，高转移潜能细胞系SF7721。MHCC—I、MHCC97-Hezrin和骨架蛋白的表达明显高于低转移潜能细胞系SMMC-7721、Hep3B、HepG2细胞（x^2=13．277，P=0．010；x^2=21．815，P〈0．01）。D-肌动蛋白在高低转移潜能细胞系的表达差异无统计学意义。通过RNA干扰技术抑制ezrin蛋白表达后。SF7721和MHHC97-H的细胞的增殖和侵袭能力均显著下降。结论ezrin和骨架蛋白的过表达与肝癌的转移潜能相关，通过下调ezrin的表达可明显抑制肝癌细胞系SMMC-7721和MHCC97-H细胞的增殖和运动侵袭能力。     

不同转移潜能肝癌细胞株血管内皮生长因子及其受体的表达和意义

目的 探讨血管内皮生长因子受体-1(VEGFR-1)在不同转移潜能肝癌细胞株中的表达及其意义.方法 应用半定量RT-PCR、酶联免疫吸附试验和(或)Western blot检测4株不同转移潜能的肝癌细胞株及一株正常肝细胞中VEGFR-1、VEGF-A、VEGF-B及VEGFR-2的mRNA和(或)蛋白质表达.结果 MHCC97-H、MHCC97-L和SMMC-7721细胞均有VEGFR-1 mRNA和蛋白质表达,且VEGFR-1 mRNA和蛋白质在MHCC97-H中的表达高于MHCC97-L、SMMC-7721的表达,两者比较,差异有统计学意义(P＜0.05),而其配体VEG-A和VEGF-B在检测的4种肝癌细胞株和正常肝细胞株L-02中均有表达.同时在检测的四种肝癌细胞株和正常肝细胞株L-02中均能检测到VEGFR-2 mRNA和蛋白质表达,但各组间表达差异无统计学意义(P＞0.05).结论 具有转移潜能的肝癌细胞株有VEGFR-1表达,而且其表达强弱与肝癌细胞株的转移潜能呈正相关,VEGFR-1的表达可能促进了肝细胞癌的侵袭转移.     

Effects of KAI1 gene on growth and invasion of human hepatocellular carcinoma MHCC97-H cells

AIM: To study the effects of sense and antisense KAI1 genes on the growth and invasion of human hepatocellular carcinoma (HCC) cell line MHCC97-H. METHODS: KAI1 sense and antisense eukaryotic expression plasmids were constructed using subclone technique and transfected into MHCC97-H cells respectively by DOTAP liposome. After successful transfection was confirmed, in vitro growth curve, cell cycles, plate clone formation efficiency, invasive ability in Boyden Chamber assay and ultrastructural morphology were studied. RESULTS: KAI1 sense and antisense genes had no significant effects on the cell growth curve and cell cycles. After transfection with sense KAI1 gene, decreased invasive ability in Boyden Chamber assay and decreased amount of mitochondria, but no significant changes of plate clone formation efficiency were observed in MHCC97-H-S cells. The plate clone formation efficiency and invasive ability in Boyden Chamber assay were significantly increased in MHCC97-H-AS cells, after transfection with antisense KAI1 gene. Furthermore, increased amount of mitochondria, rough endoplasmic reticulum, Golgi apparatus and expanded endoplasmic reticulum were also noted in MHCC97-H-AS cells. CONCLUSION: Changes of KAI1 expression in HCC cells may alter their invasive and metastasis ability of the tumor.     

Silencing thioredoxin induces liver cancer cell senescence under hypoxia

Aim: Although thioredoxin 1 (TXN) has pleiotropic cellular functions as a redox-sensitive protein, very little is known about its role in tumor survival and growth under hypoxia. MHCC97H hepatocellular carcinoma cells have a high metastatic potential and high thioredoxin expression levels compared with their parent cell line, MHCC97. Thus, we used this cell line to explore the functional connections between TXN and hypoxia. Methods: MHCC97H cells were cultured under normoxia and hypoxia for specific periods after nucleofection with TXN siRNA or control siRNA. We assessed the β-phenylethyl isothiocyanate (PEITC) sensitivity of the cells, cell proliferation, cell cycle and senescence, and DNA damage response by using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays, colony formation assays, flow cytometry, β-galactosidase staining, western blotting, and immunohistochemistry. Results: β-phenylethyl isothiocyanate treatment shifted reduced TXN to oxidized TXN in MHCC97H cells. Although silencing of TXN via siRNA had no effect on the PEITC sensitivity of the cells, it suppressed cell proliferation and colony formation under both normoxia and hypoxia. Under hypoxia, silencing TXN did not induce apoptosis but induced DNA damage response and cellular senescence. Conclusions: High TXN levels in MHCC97H cells protect them from DNA damage and cellular senescence under hypoxia. Targeting TXN might enhance the chemotherapeutic effects of some DNA-damaging agents against hepatocellular carcinoma.     

The abnormalities of chromosome 8 in two hepatocellular carcinoma cell clones with the same genetic background and different metastatic potential

PURPOSE: Two hepatocellular carcinoma (HCC) cell clones named MHCC97-H and MHCC97-L with different metastatic potential have recently been established from the same parent cell line MHCC97 in our institute. The cytogenetic alterations of these two clones were investigated in this study to explore the possible clues to the mechanism involved in HCC metastasis. METHODS: Their chromosomal aberrations were analyzed with comparative genomic hybridization (CGH), chromosome-specific painting, and two-color fluorescence in situ hybridization (FISH). RESULTS: The aberrations were found in a total of 17 chromosomes, and six kinds of the aberrations including gains of 1q, 7q, 8q, 20, and the losses of 8p23, 21q were found both in the two cell clones and their parent cell line MHCC97. Using modified CGH, with the DNA of MHCC97-L as control to test the MHCC97-H clone, the loss of 8p23 and the gain of 1q31-32, 8q21.3-22, 13q22, 17q22 were highlighted, and the most significant finding was on chromosome 8. Dual color FISH combining a pericentromeric probe and a BAC probe mapping at 8q23.1 was then performed to verify this result, and the signal ratios of the BAC to centromere were 1.43 in MHCC97-H and 1.45 in MHCC97-L, confirming the over-representations at 8q in both cells. Another interesting finding in the dual-color metaphase FISH was the intrachromosomal translocation of 8q to 8p (looked like an isochromosome 8) and non-reciprocal translocation of part of 8q to 4q, which was further clarified and proved by the FISH with whole chromosome 8 painting probe. CONCLUSIONS: The high copies amplification on 8q, the formation of isochromosome 8, non-reciprocal translocation of partial 8q to 4q, and loss of 8p occurred at the same time and are the characteristic chromosomal aberrations of the two cell clones. The chromosome 8p, especially 8p23, might harbor some novel genes related to the HCC metastasis.     

Contributions of lung tissue extracts to invasion and migration of human hepatocellular carcinoma cells with various metastatic potentials

Purpose The MHCC97 cell line contains two clones with high (MHCC97-H) and low (MHCC97-L) metastatic potentials, for which the pulmonary metastatic rate was 100% vs 40% between the two human hepatocellular carcinoma (HCC) clones. In an effort to elucidate the mechanism of organ-specific metastasis, we studied the effect of lung extracts from C57BL/6 mice on migration and invasion using the MHCC97 cell line.Methods Determination of migration and invasion induced by lung extracts to MHCC97 cell lines was examined by chemoinvasion assay. The organization of cytoskeleton was tested using filamentous actin (F-actin) polymerization assay and flow cytometry. The activity of matrix metalloproteinase (MMPs) was analyzed by zymogram. Fluorescence double staining was employed for MMPs and F-actin colocalization in MHCC97-H cells induced by lung extracts.Results The number of cells in response to extracts of lung, liver, kidney, and spleen in MHCC97-H cells was 64±10, 6±2, 22±4, and 3±1, respectively. Of the extracts, lung extracts showed significant differences to promote the migratory and invasive ability for MHCC97-H cells(p<0.001). The number of cells in response to lung extracts was threefold higher in MHCC97-H than that of cells in MHCC97-L (p<0.001). Confocal laser scan microscope of MHCC97-H cells and MHCC97-L cells stimulated with lung extracts revealed pseudopodia formation around the cell front at the indicated time point. With the time increasing, the pseudopodia formation became increasingly more obvious and distinct. Compared with unstimulated cells, analysis of FACS showed a transient 1.9-fold and 1.7-fold increase in F-actin within 30 s in MHCC97-H cells and MHCC97-L cells, respectively. Confocal laser scan microscopy of MHCC97-H cells stimulated in suspension with lung extracts revealed intense F-actin staining in the periphery of the cells and redistribution of F-actin towards a leading edge. After the cells were incubated with lung extracts, not only expressions of active and latent form of MMP-9 were upregulated, but that of latent form of MMP-2 was increased in the MHCC97-H cells and MHCC97-L cells. The levels of latent and active form of MMP-9(18.8±1.2, 100.1±1.1), and latent form of MMP-2(22.4±1.3) were much higher in MHCC97-H cells than those of MHCC97-L cells, which were 7.8±0.3, 40.8±2.2, and 8.2±0.4, respectively. MMP-9 was mainly localized perinuclear pool when the MHCC97-H cells were incubated with serum-free medium. After the cells were stimulated with lung extracts, MMP-9 were expressed and colocalized with F-actin at the front of extending pseudopodia.Conclusions Our results indicate that the expression of matrix metalloproteinase and the pseudopodia formation in MHCC97-H cells may correlate to the metastatic potential; thus, the host environment may contribute to the preferential metastasis of HCC cells to the lung depending on the high level of MMP-9 and migratory ability.     

骨髓间充质干细胞对高低转移潜能肝癌细胞影响的实验研究

目的观察人骨髓间充质干细胞(hMSC)对高低转移潜能肝癌细胞(MHCC97-H和MHCC97-L)侵袭能力和增殖能力的影响。方法 Transwell法检测hMSC对高低转移潜能肝癌细胞侵袭能力的影响,下室加入培养基和hMSC,上室加入高低转移潜能肝癌细胞悬液,共培养36 h,酶标仪吸光度(optical density,OD)值检测及细胞计数法观察侵袭能力的变化。CCK-8法检测hMSC对高低转移潜能肝癌细胞增殖能力的影响。PCR检测共培养前后转移相关因子骨桥蛋白(OPN)、唾液酸蛋白(BSP)、α-V基因、增殖相关基因TGFβ1和PDCD4的表达差异。结果 (1)侵袭能力检测结果:与对照组比较,镜下观察实验组高低转移潜能肝癌细胞迁移数量明显减少,OD值两组比较差异有统计学意义(P0.05)。MHCC97-H与hMSC共培养后OPN、BSP表达明显下降(P0.05),而α-V表达无明显变化(P0.05)。MHCC97-L与hMSC共培养后OPN、BSP、α-V表达均显著下降(P0.05)。(2)增殖能力检测结果:与对照组比较,实验组高低转移潜能肝癌细胞OD值明显增高(P0.05),实验组TGFβ1基因表达上调(P0.05),而PDCD4基因表达在两组间差异无统计学意义(P0.05),在MHCC97-L实验组PDCD4基因表达上调(P0.05)。结论 hMSC使高低转移潜能肝癌细胞的侵袭能力下调,增殖能力增强。     

Annexin A2 silencing inhibits invasion,migration, and tumorigenic potential of hepatoma cells

AIM: To investigate the effects of Annexin A2 (ANXA2) silencing on invasion, migration, and tumorigenic potential of hepatoma cells. METHODS: Human hepatoma cell lines [HepG2, SMMC-7721, SMMC-7402, and MHCC97-H, a novel human hepatocellular carcinoma (HCC) cell line with high metastasis potential] and a normal hepatocyte cell line(LO2) were used in this study. The protein and mRNA expression levels of ANXA2 were analysed by western blotting and real-time polymerase chain reaction, re-spectively. The intracellular distribution profile of ANXA2 expression was determined by immunofluorescence and immunohistochemistry. Short hairpin RNA target-ing ANXA2 was designed and stably transfected into MHCC97-H cells. Cells were cultured for in vitro analy-ses or subcutaneously injected as xenografts in mice for in vivo analyses. Effects of ANXA2 silencing on cell growth were assessed by cell counting kit-8 (CCK-8) as-say (in vitro ) and tumour-growth assay (in vivo ), on cell cycling was assessed by flow cytometry and propidium iodide staining (in vitro ), and on invasion and migration potential were assessed by transwell assay and wound-healing assay, respectively (both in vitro ). RESULTS: The MHCC97-H cells, which are known to have high metastasis potential, showed the highest lev-el of ANXA2 expression among the four HCC cell types examined; compared to the LO2 cells, the MHCC97-H expression level was 8-times higher. The ANXA2 expres-sion was effectively inhibited (about 80%) by ANXA2-specific small hairpin RNA (shRNA). ANXA2 expression in the MHCC97-H cells was mainly localized to the cel-lular membrane and cytoplasm, and some localization was detected in the nucleus. Moreover, the proliferation of MHCC97-H cells was obviously suppressed by shR-NA-mediated ANXA2 silencing in vitro , and the tumour growth inhibition rate was 38.24% in vivo . The per-centage of MHCC97-H cells in S phase dramatically de-creased (to 27.76%) under ANXA2-silenced conditions. Furthermore, ANXA2-silenced MHCC97-H cells showed lower invasivenes